Merge branch 'master' into AX25_FM

Add some delay to squelch

.gitignore

@@ -1,6 +1,5 @@
 *.o
 obj/
 bin/
-STM32F4XX_Lib/
 GitVersion.h
 build/

.gitmodules

@@ -0,0 +1,9 @@
+[submodule "STM32F4XX_Lib"]
+	path = STM32F4XX_Lib
+	url = https://github.com/juribeparada/STM32F4XX_Lib.git
+[submodule "STM32F7XX_Lib"]
+	path = STM32F7XX_Lib
+	url = https://github.com/juribeparada/STM32F7XX_Lib.git
+[submodule "STM32F10X_Lib"]
+	path = STM32F10X_Lib
+	url = https://github.com/shawnchain/STM32F10X_Lib.git

AX25Defines.h

@@ -0,0 +1,36 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(AX25DEFINES_H)
+#define  AX25DEFINES_H
+
+const uint8_t AX25_RADIO_SYMBOL_LENGTH = 20U;      // At 24 kHz sample rate
+
+const uint8_t AX25_FRAME_START = 0x7EU;
+const uint8_t AX25_FRAME_END   = 0x7EU;
+const uint8_t AX25_FRAME_ABORT = 0xFEU;
+
+const uint8_t AX25_MAX_ONES    = 5U;
+
+const uint16_t AX25_MIN_FRAME_LENGTH = 17U;        // Callsign (7) + Callsign (7) + Control (1) + Checksum (2)
+
+const uint16_t AX25_MAX_FRAME_LENGTH = 330U;       // Callsign (7) + Callsign (7) + 8 Digipeaters (56) +
+                                                   // Control (1) + PID (1) + Data (256) + Checksum (2)
+
+#endif
+

AX25Demodulator.cpp

@@ -0,0 +1,314 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright 2015-2019 Mobilinkd LLC <[email protected]>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "AX25Demodulator.h"
+#include "AX25Defines.h"
+
+const float32_t SAMPLE_RATE = 24000.0F;
+const float32_t SYMBOL_RATE = 1200.0F;
+
+const uint16_t DELAY_LEN = 11U;
+
+const float32_t SAMPLES_PER_SYMBOL = SAMPLE_RATE / SYMBOL_RATE;
+const float32_t PLL_LIMIT          = SAMPLES_PER_SYMBOL / 2.0F;
+
+const uint32_t LPF_FILTER_LEN = 48U;
+
+q15_t LPF_FILTER_COEFFS[] = {
+    -2,   -8,  -17,  -28,  -40,  -47,  -47,  -34,
+    -5,   46,  122,  224,  354,  510,  689,  885,
+  1092, 1302, 1506, 1693, 1856, 1987, 2077, 2124,
+  2124, 2077, 1987, 1856, 1693, 1506, 1302, 1092,
+  885,  689,  510,  354,  224,  122,   46,    -5,
+  -34,  -47,  -47,  -40,  -28,  -17,   -8,    -2
+};
+
+// Lock low-pass filter taps (80Hz Bessel)
+// scipy.signal:
+//      b, a = bessel(4, [80.0/(1200/2)], 'lowpass')
+//
+const uint8_t PLL_IIR_SIZE = 5U;
+
+const float32_t PLL_LOCK_B[] = {
+    1.077063e-03,4.308253e-03,6.462379e-03,4.308253e-03,1.077063e-03};
+
+const float32_t PLL_LOCK_A[] = {
+    1.000000e+00,-2.774567e+00,2.962960e+00,-1.437990e+00,2.668296e-01};
+
+// 64 Hz loop filter.
+// scipy.signal:
+//      loop_coeffs = firwin(9, [64.0/(1200/2)], width = None,
+//          pass_zero = True, scale = True, window='hann')
+//
+const uint32_t PLL_FILTER_LEN = 7U;
+
+float32_t PLL_FILTER_COEFFS[] = {3.196252e-02F, 1.204223e-01F, 2.176819e-01F, 2.598666e-01F, 2.176819e-01F, 1.204223e-01F, 3.196252e-02F};
+
+CAX25Demodulator::CAX25Demodulator(int8_t n) :
+m_frame(),
+m_twist(n),
+m_lpfFilter(),
+m_lpfState(),
+m_delayLine(NULL),
+m_delayPos(0U),
+m_nrziState(false),
+m_pllFilter(),
+m_pllState(),
+m_pllLast(false),
+m_pllBits(1U),
+m_pllCount(0.0F),
+m_pllJitter(0.0F),
+m_pllDCD(false),
+m_iirHistory(),
+m_hdlcOnes(0U),
+m_hdlcFlag(false),
+m_hdlcBuffer(0U),
+m_hdlcBits(0U),
+m_hdlcState(AX25_IDLE)
+{
+  m_delayLine = new bool[DELAY_LEN];
+
+  m_lpfFilter.numTaps = LPF_FILTER_LEN;
+  m_lpfFilter.pState  = m_lpfState;
+  m_lpfFilter.pCoeffs = LPF_FILTER_COEFFS;
+
+  m_pllFilter.numTaps = PLL_FILTER_LEN;
+  m_pllFilter.pState  = m_pllState;
+  m_pllFilter.pCoeffs = PLL_FILTER_COEFFS;
+
+  for (uint8_t i = 0U; i < PLL_IIR_SIZE; i++)
+    m_iirHistory[i] = 0.0F;
+}
+
+bool CAX25Demodulator::process(q15_t* samples, uint8_t length, CAX25Frame& frame)
+{
+  bool result = false;
+
+  q15_t fa[RX_BLOCK_SIZE];
+  m_twist.process(samples, fa, RX_BLOCK_SIZE);
+
+  int16_t buffer[RX_BLOCK_SIZE];
+  for (uint8_t i = 0; i < length; i++) {
+      bool   level = (fa[i] >= 0);
+      bool delayed = delay(level);
+      buffer[i] = (int16_t(level ^ delayed) << 1) - 1;
+  }
+
+  q15_t fc[RX_BLOCK_SIZE];
+  ::arm_fir_fast_q15(&m_lpfFilter, buffer, fc, RX_BLOCK_SIZE);
+
+  for (uint8_t i = 0; i < length; i++) {
+    bool bit = fc[i] >= 0;
+    bool sample = PLL(bit);
+
+    if (sample) {
+      // We will only ever get one frame because there are
+      // not enough bits in a block for more than one.
+      if (result) {
+        HDLC(NRZI(bit));
+      } else {
+        result = HDLC(NRZI(bit));
+        if (result) {
+          // Copy the frame data.
+          ::memcpy(frame.m_data, m_frame.m_data, AX25_MAX_PACKET_LEN);
+          frame.m_length = m_frame.m_length;
+          frame.m_fcs    = m_frame.m_fcs;
+          m_frame.m_length = 0U;
+        }
+      }
+    }
+  }
+
+  return result;
+}
+
+bool CAX25Demodulator::delay(bool b)
+{
+  bool r = m_delayLine[m_delayPos];
+
+  m_delayLine[m_delayPos++] = b;
+
+  if (m_delayPos >= DELAY_LEN)
+    m_delayPos = 0U;
+
+  return r;
+}
+
+bool CAX25Demodulator::NRZI(bool b)
+{
+  bool result = (b == m_nrziState);
+
+  m_nrziState = b;
+
+  return result;
+}
+
+bool CAX25Demodulator::PLL(bool input)
+{
+  bool sample = false;
+		
+  if (input != m_pllLast || m_pllBits > 16U) {
+    // Record transition.
+    m_pllLast = input;
+
+    if (m_pllCount > PLL_LIMIT)
+      m_pllCount -= SAMPLES_PER_SYMBOL;
+
+    float32_t adjust = m_pllBits > 16U ? 5.0F : 0.0F;
+    float32_t offset = m_pllCount / float32_t(m_pllBits);
+    float32_t jitter;
+    ::arm_fir_f32(&m_pllFilter, &offset, &jitter, 1U);
+
+    float32_t absOffset = adjust;
+    if (offset < 0.0F)
+      absOffset -= offset;
+    else
+      absOffset += offset;
+    m_pllJitter = iir(absOffset);
+
+    m_pllCount -= jitter / 2.0F;
+    m_pllBits = 1U;
+  } else {
+    if (m_pllCount > PLL_LIMIT) {
+      sample = true;
+      m_pllCount -= SAMPLES_PER_SYMBOL;
+      m_pllBits++;
+    }
+  }
+
+  m_pllCount += 1.0F;
+
+  return sample;
+}
+
+bool CAX25Demodulator::HDLC(bool b)
+{
+  if (m_hdlcOnes == AX25_MAX_ONES) {
+    if (b) {
+      // flag byte
+      m_hdlcFlag = true;
+    } else {
+      // bit stuffing...
+      m_hdlcFlag = false;
+      m_hdlcOnes = 0U;
+      return false;
+    }
+  }
+
+  m_hdlcBuffer >>= 1;
+  m_hdlcBuffer |= b ? 128U : 0U;
+  m_hdlcBits++;                      // Free-running until Sync byte.
+
+  if (b)
+    m_hdlcOnes++;
+  else
+    m_hdlcOnes = 0U;
+
+  if (m_hdlcFlag) {
+    bool result = false;
+
+    switch (m_hdlcBuffer) {
+      case AX25_FRAME_END:
+        if (m_frame.m_length >= AX25_MIN_FRAME_LENGTH) {
+          result = m_frame.checkCRC();
+          if (!result)
+              m_frame.m_length = 0U;
+        } else {
+            m_frame.m_length = 0U;
+        }
+        m_hdlcState = AX25_SYNC;
+        m_hdlcFlag = false;
+        m_hdlcBits = 0U;
+        break;
+
+      case AX25_FRAME_ABORT:
+        // Frame aborted
+        m_frame.m_length = 0U;
+        m_hdlcState = AX25_IDLE;
+        m_hdlcFlag = false;
+        m_hdlcBits = 0U;
+        break;
+
+      default:
+        break;
+    }
+
+    return result;
+  }
+
+  switch (m_hdlcState) {
+    case AX25_IDLE:
+      break;
+
+    case AX25_SYNC:
+      if (m_hdlcBits == 8U) {    // 8th bit.
+        // Start of frame data.
+        m_hdlcState = AX25_RECEIVE;
+        m_frame.append(m_hdlcBuffer);
+        m_hdlcBits = 0U;
+      }
+      break;
+
+    case AX25_RECEIVE:
+      if (m_hdlcBits == 8U) {    // 8th bit.
+        m_frame.append(m_hdlcBuffer);
+        m_hdlcBits = 0U;
+      }
+      break;
+
+    default:
+      break;
+  }
+
+  return false;
+}
+
+void CAX25Demodulator::setTwist(int8_t n)
+{
+  m_twist.setTwist(n);
+}
+
+bool CAX25Demodulator::isDCD()
+{
+  if (m_pllJitter <= (SAMPLES_PER_SYMBOL * 0.03F))
+    m_pllDCD = true;
+  else if (m_pllJitter >= (SAMPLES_PER_SYMBOL * 0.15F))
+    m_pllDCD = false;
+
+  return m_pllDCD;
+}
+
+float32_t CAX25Demodulator::iir(float32_t input)
+{
+  for (int8_t i = int8_t(PLL_IIR_SIZE) - 1; i != 0; i--)
+    m_iirHistory[i] = m_iirHistory[i - 1];
+
+  m_iirHistory[0] = input;
+  for (uint8_t i = 1U; i < PLL_IIR_SIZE; i++)
+    m_iirHistory[0] -= PLL_LOCK_A[i] * m_iirHistory[i];
+
+  float32_t result = 0.0F;
+  for (uint8_t i = 0U; i < PLL_IIR_SIZE; i++)
+    result += PLL_LOCK_B[i] * m_iirHistory[i];
+
+  return result;
+}
+

AX25Demodulator.h

@@ -0,0 +1,73 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(AX25Demodulator_H)
+#define  AX25Demodulator_H
+
+#include "Config.h"
+
+#include "AX25Frame.h"
+#include "AX25Twist.h"
+
+enum AX25_STATE {
+  AX25_IDLE,
+  AX25_SYNC,
+  AX25_RECEIVE
+};
+
+class CAX25Demodulator {
+public:
+  CAX25Demodulator(int8_t n);
+
+  bool process(q15_t* samples, uint8_t length, CAX25Frame& frame);
+
+  void setTwist(int8_t n);
+
+  bool isDCD();
+
+private:
+  CAX25Frame           m_frame;
+  CAX25Twist           m_twist;
+  arm_fir_instance_q15 m_lpfFilter;
+  q15_t                m_lpfState[70U];     // NoTaps + BlockSize - 1, 48 + 20 - 1 plus some spare
+  bool*                m_delayLine;
+  uint16_t             m_delayPos;
+  bool                 m_nrziState;
+  arm_fir_instance_f32 m_pllFilter;
+  float32_t            m_pllState[20U];     // NoTaps + BlockSize - 1, 7 + 1 - 1 plus some spare
+  bool                 m_pllLast;
+  uint8_t              m_pllBits;
+  float32_t            m_pllCount;
+  float32_t            m_pllJitter;
+  bool                 m_pllDCD;
+  float32_t            m_iirHistory[5U];
+  uint16_t             m_hdlcOnes;
+  bool                 m_hdlcFlag;
+  uint16_t             m_hdlcBuffer;
+  uint16_t             m_hdlcBits;
+  AX25_STATE           m_hdlcState;
+
+  bool delay(bool b);
+  bool NRZI(bool b);
+  bool PLL(bool b);
+  bool HDLC(bool b);
+  float32_t iir(float32_t input);
+};
+
+#endif
+

AX25Frame.cpp

@@ -0,0 +1,122 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "AX25Frame.h"
+
+const uint16_t CCITT_TABLE[] = {
+	0x0000,0x1189,0x2312,0x329b,0x4624,0x57ad,0x6536,0x74bf,
+	0x8c48,0x9dc1,0xaf5a,0xbed3,0xca6c,0xdbe5,0xe97e,0xf8f7,
+	0x1081,0x0108,0x3393,0x221a,0x56a5,0x472c,0x75b7,0x643e,
+	0x9cc9,0x8d40,0xbfdb,0xae52,0xdaed,0xcb64,0xf9ff,0xe876,
+	0x2102,0x308b,0x0210,0x1399,0x6726,0x76af,0x4434,0x55bd,
+	0xad4a,0xbcc3,0x8e58,0x9fd1,0xeb6e,0xfae7,0xc87c,0xd9f5,
+	0x3183,0x200a,0x1291,0x0318,0x77a7,0x662e,0x54b5,0x453c,
+	0xbdcb,0xac42,0x9ed9,0x8f50,0xfbef,0xea66,0xd8fd,0xc974,
+	0x4204,0x538d,0x6116,0x709f,0x0420,0x15a9,0x2732,0x36bb,
+	0xce4c,0xdfc5,0xed5e,0xfcd7,0x8868,0x99e1,0xab7a,0xbaf3,
+	0x5285,0x430c,0x7197,0x601e,0x14a1,0x0528,0x37b3,0x263a,
+	0xdecd,0xcf44,0xfddf,0xec56,0x98e9,0x8960,0xbbfb,0xaa72,
+	0x6306,0x728f,0x4014,0x519d,0x2522,0x34ab,0x0630,0x17b9,
+	0xef4e,0xfec7,0xcc5c,0xddd5,0xa96a,0xb8e3,0x8a78,0x9bf1,
+	0x7387,0x620e,0x5095,0x411c,0x35a3,0x242a,0x16b1,0x0738,
+	0xffcf,0xee46,0xdcdd,0xcd54,0xb9eb,0xa862,0x9af9,0x8b70,
+	0x8408,0x9581,0xa71a,0xb693,0xc22c,0xd3a5,0xe13e,0xf0b7,
+	0x0840,0x19c9,0x2b52,0x3adb,0x4e64,0x5fed,0x6d76,0x7cff,
+	0x9489,0x8500,0xb79b,0xa612,0xd2ad,0xc324,0xf1bf,0xe036,
+	0x18c1,0x0948,0x3bd3,0x2a5a,0x5ee5,0x4f6c,0x7df7,0x6c7e,
+	0xa50a,0xb483,0x8618,0x9791,0xe32e,0xf2a7,0xc03c,0xd1b5,
+	0x2942,0x38cb,0x0a50,0x1bd9,0x6f66,0x7eef,0x4c74,0x5dfd,
+	0xb58b,0xa402,0x9699,0x8710,0xf3af,0xe226,0xd0bd,0xc134,
+	0x39c3,0x284a,0x1ad1,0x0b58,0x7fe7,0x6e6e,0x5cf5,0x4d7c,
+	0xc60c,0xd785,0xe51e,0xf497,0x8028,0x91a1,0xa33a,0xb2b3,
+	0x4a44,0x5bcd,0x6956,0x78df,0x0c60,0x1de9,0x2f72,0x3efb,
+	0xd68d,0xc704,0xf59f,0xe416,0x90a9,0x8120,0xb3bb,0xa232,
+	0x5ac5,0x4b4c,0x79d7,0x685e,0x1ce1,0x0d68,0x3ff3,0x2e7a,
+	0xe70e,0xf687,0xc41c,0xd595,0xa12a,0xb0a3,0x8238,0x93b1,
+	0x6b46,0x7acf,0x4854,0x59dd,0x2d62,0x3ceb,0x0e70,0x1ff9,
+	0xf78f,0xe606,0xd49d,0xc514,0xb1ab,0xa022,0x92b9,0x8330,
+	0x7bc7,0x6a4e,0x58d5,0x495c,0x3de3,0x2c6a,0x1ef1,0x0f78 };
+
+CAX25Frame::CAX25Frame(const uint8_t* data, uint16_t length) :
+m_data(),
+m_length(0U),
+m_fcs(0U)
+{
+  for (uint16_t i = 0U; i < length && i < (AX25_MAX_PACKET_LEN - 2U); i++)
+    m_data[m_length++] = data[i];
+}
+
+CAX25Frame::CAX25Frame() :
+m_data(),
+m_length(0U),
+m_fcs(0U)
+{
+}
+
+bool CAX25Frame::append(uint16_t c)
+{
+  if (m_length == AX25_MAX_PACKET_LEN)
+    return false;
+
+  m_data[m_length++] = uint8_t(c);
+
+  return true;
+}
+
+bool CAX25Frame::checkCRC()
+{
+  union {
+    uint16_t crc16;
+    uint8_t  crc8[2U];
+  };
+
+  crc16 = 0xFFFFU;
+  for (uint16_t i = 0U; i < (m_length - 2U); i++)
+    crc16 = uint16_t(crc8[1U]) ^ CCITT_TABLE[crc8[0U] ^ m_data[i]];
+
+  crc16 = ~crc16;
+
+  if (crc8[0U] == m_data[m_length - 2U] && crc8[1U] == m_data[m_length - 1U]) {
+    m_fcs = crc16;
+    return true;
+  } else {
+    return false;
+  }
+}
+
+void CAX25Frame::addCRC()
+{
+  union {
+    uint16_t crc16;
+    uint8_t  crc8[2U];
+  };
+
+  crc16 = 0xFFFFU;
+  for (uint16_t i = 0U; i < m_length; i++)
+    crc16 = uint16_t(crc8[1U]) ^ CCITT_TABLE[crc8[0U] ^ m_data[i]];
+
+  crc16 = ~crc16;
+
+  m_fcs = crc16;
+
+  m_data[m_length++] = crc8[0U];
+  m_data[m_length++] = crc8[1U];
+}
+

AX25Frame.h

@@ -0,0 +1,43 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(AX25Frame_H)
+#define  AX25Frame_H
+
+#include "Config.h"
+
+const uint16_t AX25_MAX_PACKET_LEN = 300U;
+
+class CAX25Frame {
+public:
+  CAX25Frame(const uint8_t* data, uint16_t length);
+  CAX25Frame();
+
+  bool append(uint16_t c);
+
+  bool checkCRC();
+
+  void addCRC();
+
+  uint8_t  m_data[AX25_MAX_PACKET_LEN];
+  uint16_t m_length;
+  uint16_t m_fcs;
+};
+
+#endif
+

AX25RX.cpp

@@ -0,0 +1,205 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "AX25RX.h"
+
+/*
+ * Generated with Scipy Filter, 152 coefficients, 1100-2300Hz bandpass,
+ * Hann window, starting and ending 0 value coefficients removed.
+ *
+ * np.array(
+ *  firwin2(152,
+ *      [
+ *          0.0,
+ *          1000.0/(sample_rate/2),
+ *          1100.0/(sample_rate/2),
+ *          2350.0/(sample_rate/2),
+ *          2500.0/(sample_rate/2),
+ *          1.0
+ *      ],
+ *      [0,0,1,1,0,0],
+ *      antisymmetric = False,
+ *      window='hann') * 32768,
+ *  dtype=int)[10:-10]
+ */
+
+const uint32_t FILTER_LEN = 130U;
+
+q15_t FILTER_COEFFS[] = {
+      5,    12,    18,    21,   19,   11,    -2,   -15,   -25,   -27,
+    -21,   -11,    -3,    -5,  -19,  -43,   -69,   -83,   -73,   -35,
+     27,    98,   155,   180,  163,  109,    39,   -20,   -45,   -26,
+     23,    74,    89,    39,  -81, -247,  -407,  -501,  -480,  -334,
+    -92,   175,   388,   479,  429,  275,    99,     5,    68,   298,
+    626,   913,   994,   740,  115, -791, -1770, -2544, -2847, -2509,
+  -1527,   -76,  1518,  2875, 3653, 3653,  2875,  1518,   -76, -1527,
+  -2509, -2847, -2544, -1770, -791,  115,   740,   994,   913,   626,
+    298,    68,     5,    99,  275,  429,   479,   388,   175,   -92,
+   -334,  -480,  -501,  -407, -247,  -81,    39,    89,    74,    23,
+    -26,   -45,   -20,    39,  109,  163,   180,   155,    98,    27,
+    -35,   -73,   -83,   -69,  -43,  -19,    -5,    -3,   -11,   -21,
+    -27,   -25,   -15,    -2,   11,   19,    21,    18,    12,     5
+};
+
+CAX25RX::CAX25RX() :
+m_filter(),
+m_state(),
+m_demod1(3),
+m_demod2(6),
+m_demod3(9),
+m_lastFCS(0U),
+m_count(0U),
+m_slotTime(30U),
+m_slotCount(0U),
+m_pPersist(128U),
+m_dcd(false),
+m_canTX(false),
+m_x(1U),
+m_a(0xB7U),
+m_b(0x73U),
+m_c(0xF6U)
+{
+  m_filter.numTaps = FILTER_LEN;
+  m_filter.pState  = m_state;
+  m_filter.pCoeffs = FILTER_COEFFS;
+
+  initRand();
+}
+
+void CAX25RX::samples(q15_t* samples, uint8_t length)
+{
+  q15_t output[RX_BLOCK_SIZE];
+  ::arm_fir_fast_q15(&m_filter, samples, output, RX_BLOCK_SIZE);
+
+  m_count++;
+
+  CAX25Frame frame;
+
+  bool ret = m_demod1.process(output, length, frame);
+  if (ret) {
+    if (frame.m_fcs != m_lastFCS || m_count > 2U) {
+      m_lastFCS = frame.m_fcs;
+      m_count   = 0U;
+      serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
+    }
+    DEBUG1("Decoder 1 reported");
+  }
+
+  ret = m_demod2.process(output, length, frame);
+  if (ret) {
+    if (frame.m_fcs != m_lastFCS || m_count > 2U) {
+      m_lastFCS = frame.m_fcs;
+      m_count   = 0U;
+      serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
+    }
+    DEBUG1("Decoder 2 reported");
+  }
+
+  ret = m_demod3.process(output, length, frame);
+  if (ret) {
+    if (frame.m_fcs != m_lastFCS || m_count > 2U) {
+      m_lastFCS = frame.m_fcs;
+      m_count   = 0U;
+      serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
+    }
+    DEBUG1("Decoder 3 reported");
+  }
+
+  m_slotCount += RX_BLOCK_SIZE;
+  if (m_slotCount >= m_slotTime) {
+    m_slotCount = 0U;
+
+    bool dcd1 = m_demod1.isDCD();
+    bool dcd2 = m_demod2.isDCD();
+    bool dcd3 = m_demod3.isDCD();
+    
+    if (dcd1 || dcd2 || dcd3) {
+      if (!m_dcd) {
+        io.setDecode(true);
+        io.setADCDetection(true);
+        m_dcd = true;
+      }
+
+      m_canTX = false;
+    } else {
+      if (m_dcd) {
+        io.setDecode(false);
+        io.setADCDetection(false);
+        m_dcd = false;
+      }
+
+      m_canTX = m_pPersist >= rand();
+    }
+  }
+}
+
+bool CAX25RX::canTX() const
+{
+  return m_canTX;
+}
+
+void CAX25RX::setParams(int8_t twist, uint8_t slotTime, uint8_t pPersist)
+{
+  m_demod1.setTwist(twist - 3);
+  m_demod2.setTwist(twist);
+  m_demod3.setTwist(twist + 3);
+
+  m_slotTime = slotTime * 240U;    // Slot time in samples
+  m_pPersist = pPersist;
+}
+
+// Taken from https://www.electro-tech-online.com/threads/ultra-fast-pseudorandom-number-generator-for-8-bit.124249/
+//X ABC Algorithm Random Number Generator for 8-Bit Devices:
+//This is a small PRNG, experimentally verified to have at least a 50 million byte period
+//by generating 50 million bytes and observing that there were no overapping sequences and repeats.
+//This generator passes serial correlation, entropy , Monte Carlo Pi value, arithmetic mean,
+//And many other statistical tests. This generator may have a period of up to 2^32, but this has
+//not been verified.
+//
+// By XORing 3 bytes into the a,b, and c registers, you can add in entropy from 
+//an external source easily.
+//
+//This generator is free to use, but is not suitable for cryptography due to its short period(by //cryptographic standards) and simple construction. No attempt was made to make this generator 
+// suitable for cryptographic use.
+//
+//Due to the use of a constant counter, the generator should be resistant to latching up.
+//A significant performance gain is had in that the x variable is only ever incremented.
+//
+//Only 4 bytes of ram are needed for the internal state, and generating a byte requires 3 XORs , //2 ADDs, one bit shift right , and one increment. Difficult or slow operations like multiply, etc 
+//were avoided for maximum speed on ultra low power devices.
+
+
+void CAX25RX::initRand() //Can also be used to seed the rng with more entropy during use.
+{
+  m_a = (m_a ^ m_c ^ m_x);
+  m_b = (m_b + m_a);
+  m_c = (m_c + (m_b >> 1) ^ m_a);
+}
+
+uint8_t CAX25RX::rand()
+{
+  m_x++;                           //x is incremented every round and is not affected by any other variable
+
+  m_a = (m_a ^ m_c ^ m_x);         //note the mix of addition and XOR
+  m_b = (m_b + m_a);               //And the use of very few instructions
+  m_c = (m_c + (m_b >> 1) ^ m_a);  //the right shift is to ensure that high-order bits from b can affect  
+
+  return uint8_t(m_c);             //low order bits of other variables
+}

AX25RX.h

@@ -0,0 +1,59 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(AX25RX_H)
+#define  AX25RX_H
+
+#include "Config.h"
+
+#include "AX25Demodulator.h"
+
+class CAX25RX {
+public:
+  CAX25RX();
+
+  void samples(q15_t* samples, uint8_t length);
+
+  void setParams(int8_t twist, uint8_t slotTime, uint8_t pPersist);
+
+  bool canTX() const;
+
+private:
+  arm_fir_instance_q15 m_filter;
+  q15_t                m_state[160U];    // NoTaps + BlockSize - 1, 130 + 20 - 1 plus some spare
+  CAX25Demodulator     m_demod1;
+  CAX25Demodulator     m_demod2;
+  CAX25Demodulator     m_demod3;
+  uint16_t             m_lastFCS;
+  uint32_t             m_count;
+  uint32_t             m_slotTime;
+  uint32_t             m_slotCount;
+  uint8_t              m_pPersist;
+  bool                 m_dcd;
+  bool                 m_canTX;
+  uint8_t              m_x;
+  uint8_t              m_a;
+  uint8_t              m_b;
+  uint8_t              m_c;
+  
+  void initRand();
+  uint8_t rand();
+};
+
+#endif
+

AX25TX.cpp

@@ -0,0 +1,186 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "AX25TX.h"
+
+#include "AX25Defines.h"
+#include "AX25Frame.h"
+
+
+const uint8_t START_FLAG[] = { AX25_FRAME_START };
+const uint8_t END_FLAG[]   = { AX25_FRAME_END };
+
+const uint8_t BIT_MASK_TABLE1[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U };
+
+#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE1[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE1[(i)&7])
+#define READ_BIT1(p,i)    (p[(i)>>3] & BIT_MASK_TABLE1[(i)&7])
+
+const uint8_t BIT_MASK_TABLE2[] = { 0x01U, 0x02U, 0x04U, 0x08U, 0x10U, 0x20U, 0x40U, 0x80U };
+
+#define WRITE_BIT2(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE2[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE2[(i)&7])
+#define READ_BIT2(p,i)    (p[(i)>>3] & BIT_MASK_TABLE2[(i)&7])
+
+const uint16_t AUDIO_TABLE_LEN = 120U;
+
+const q15_t AUDIO_TABLE_DATA[] = {
+  0, 214, 428, 641, 851, 1060, 1265, 1468, 1666, 1859, 2048, 2230, 2407, 2577, 2740, 2896, 3043, 3182, 3313, 3434, 3546, 3649,
+  3741, 3823, 3895, 3955, 4006, 4045, 4073, 4089, 4095, 4089, 4073, 4045, 4006, 3955, 3895, 3823, 3741, 3649, 3546, 3434, 3313,
+  3182, 3043, 2896, 2740, 2577, 2407, 2230, 2048, 1859, 1666, 1468, 1265, 1060, 851, 641, 428, 214, 0, -214, -428, -641, -851,
+  -1060, -1265, -1468, -1666, -1859, -2047, -2230, -2407, -2577, -2740, -2896, -3043, -3182, -3313, -3434, -3546, -3649, -3741,
+  -3823, -3895, -3955, -4006, -4045, -4073, -4089, -4095, -4089, -4073, -4045, -4006, -3955, -3895, -3823, -3741, -3649, -3546,
+  -3434, -3313, -3182, -3043, -2896, -2740, -2577, -2407, -2230, -2047, -1859, -1666, -1468, -1265, -1060, -851, -641, -428, -214
+};
+
+CAX25TX::CAX25TX() :
+m_poBuffer(),
+m_poLen(0U),
+m_poPtr(0U),
+m_txDelay(360U),
+m_tablePtr(0U),
+m_nrzi(false)
+{
+}
+
+void CAX25TX::process()
+{
+  if (m_poLen == 0U)
+    return;
+
+  if (!m_duplex) {
+    if (m_poPtr == 0U) {
+      bool tx = ax25RX.canTX();
+      if (!tx)
+        return;
+    }
+  }
+
+  uint16_t space = io.getSpace();
+
+  while (space > AX25_RADIO_SYMBOL_LENGTH) {
+    bool b = READ_BIT1(m_poBuffer, m_poPtr) != 0U;
+    m_poPtr++;
+
+    writeBit(b);
+
+    space -= AX25_RADIO_SYMBOL_LENGTH;
+
+    if (m_poPtr >= m_poLen) {
+      m_poPtr = 0U;
+      m_poLen = 0U;
+      return;
+    }
+  }
+}
+
+uint8_t CAX25TX::writeData(const uint8_t* data, uint16_t length)
+{
+  CAX25Frame frame(data, length);
+  frame.addCRC();
+
+  m_poLen    = 0U;
+  m_poPtr    = 0U;
+  m_nrzi     = false;
+  m_tablePtr = 0U;
+
+  // Add TX delay
+  for (uint16_t i = 0U; i < m_txDelay; i++, m_poLen++) {
+    bool preamble = NRZI(false);
+    WRITE_BIT1(m_poBuffer, m_poLen, preamble);
+  }
+
+  // Add the Start Flag
+  for (uint16_t i = 0U; i < 8U; i++, m_poLen++) {
+    bool b1 = READ_BIT1(START_FLAG, i) != 0U;
+    bool b2 = NRZI(b1);
+    WRITE_BIT1(m_poBuffer, m_poLen, b2);
+  }
+
+  uint8_t ones = 0U;
+  for (uint16_t i = 0U; i < (frame.m_length * 8U); i++) {
+    bool b1 = READ_BIT2(frame.m_data, i) != 0U;
+    bool b2 = NRZI(b1);
+    WRITE_BIT1(m_poBuffer, m_poLen, b2);
+    m_poLen++;
+
+    if (b1) {
+      ones++;
+      if (ones == AX25_MAX_ONES) {
+        // Bit stuffing
+        bool b = NRZI(false);
+        WRITE_BIT1(m_poBuffer, m_poLen, b);
+        m_poLen++;
+        ones = 0U;
+      }
+    } else {
+      ones = 0U;
+    }
+  }
+
+  // Add the End Flag
+  for (uint16_t i = 0U; i < 8U; i++, m_poLen++) {
+    bool b1 = READ_BIT1(END_FLAG, i) != 0U;
+    bool b2 = NRZI(b1);
+    WRITE_BIT1(m_poBuffer, m_poLen, b2);
+  }
+
+  return 0U;
+}
+
+void CAX25TX::writeBit(bool b)
+{
+  q15_t buffer[AX25_RADIO_SYMBOL_LENGTH];
+  for (uint8_t i = 0U; i < AX25_RADIO_SYMBOL_LENGTH; i++) {
+    q15_t value = AUDIO_TABLE_DATA[m_tablePtr];
+
+    if (b) {
+      // De-emphasise the lower frequency by 6dB
+      value >>= 2;
+      m_tablePtr += 6U;
+    } else {
+      m_tablePtr += 11U;
+    }
+
+    buffer[i] = value;
+
+    if (m_tablePtr >= AUDIO_TABLE_LEN)
+      m_tablePtr -= AUDIO_TABLE_LEN;
+  }
+
+  io.write(STATE_AX25, buffer, AX25_RADIO_SYMBOL_LENGTH);
+}
+
+void CAX25TX::setTXDelay(uint8_t delay)
+{
+  m_txDelay = delay * 12U;
+}
+
+uint8_t CAX25TX::getSpace() const
+{
+  return m_poLen == 0U ? 255U : 0U;
+}
+
+bool CAX25TX::NRZI(bool b)
+{
+    if (!b)
+      m_nrzi = !m_nrzi;
+
+    return m_nrzi;
+}
+

AX25TX.h

@@ -0,0 +1,49 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(AX25TX_H)
+#define  AX25TX_H
+
+#include "Config.h"
+
+class CAX25TX {
+public:
+  CAX25TX();
+
+  uint8_t writeData(const uint8_t* data, uint16_t length);
+
+  void process();
+
+  void setTXDelay(uint8_t delay);
+
+  uint8_t getSpace() const;
+
+private:
+  uint8_t    m_poBuffer[600U];
+  uint16_t   m_poLen;
+  uint16_t   m_poPtr;
+  uint16_t   m_txDelay;
+  uint16_t   m_tablePtr;
+  bool       m_nrzi;
+
+  void writeBit(bool b);
+  bool NRZI(bool b);
+};
+
+#endif
+

AX25Twist.cpp

@@ -0,0 +1,311 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "AX25Twist.h"
+
+// 1200Hz = -12dB, 2200Hz = 0dB; 3381Hz cutoff; cosine.
+q15_t dB12[] = {
+  176,
+  -812,
+  -3916,
+  -7586,
+  23536,
+  -7586,
+  -3916,
+  -812,
+  176
+};
+
+// 1200Hz = -11dB, 2200Hz = 0dB; 3258Hz cutoff; cosine.
+q15_t dB11[] = {
+  121,
+  -957,
+  -3959,
+  -7383,
+  23871,
+  -7383,
+  -3959,
+  -957,
+  121
+};
+
+// 1200Hz = -10dB, 2200Hz = 0dB; 3118Hz cutoff; cosine.
+q15_t dB10[] = {
+  56,
+  -1110,
+  -3987,
+  -7141,
+  24254,
+  -7141,
+  -3987,
+  -1110,
+  56
+};
+
+// 1200Hz = -9dB, 2200Hz = 0dB; 2959Hz cutoff; cosine.
+q15_t dB9[] = {
+  -19,
+  -1268,
+  -3994,
+  -6856,
+  24688,
+  -6856,
+  -3994,
+  -1268,
+  -19
+};
+
+// 1200Hz = -8dB, 2200Hz = 0dB; 2778Hz cutoff; cosine.
+q15_t dB8[] = {
+  -104,
+  -1424,
+  -3968,
+  -6516,
+  25182,
+  -6516,
+  -3968,
+  -1424,
+  -104
+};
+
+// 1200Hz = -7dB, 2200Hz = 0dB; 2573Hz cutoff; cosine.
+q15_t dB7[] = {
+  -196,
+  -1565,
+  -3896,
+  -6114,
+  25742,
+  -6114,
+  -3896,
+  -1565,
+  -196
+};
+
+// 1200Hz = -6dB, 2200Hz = 0dB; 2343Hz cutoff; cosine.
+q15_t dB6[] = {
+  -288,
+  -1676,
+  -3761,
+  -5642,
+  26370,
+  -5642,
+  -3761,
+  -1676,
+  -288
+};
+
+// 1200Hz = -5dB, 2200Hz = 0dB; 2085Hz cutoff; cosine.
+q15_t dB5[] = {
+  -370,
+  -1735,
+  -3545,
+  -5088,
+  27075,
+  -5088,
+  -3545,
+  -1735,
+  -370
+};
+
+// 1200Hz = -4dB, 2200Hz = 0dB; 1790Hz cutoff; cosine.
+q15_t dB4[] = {
+  -432,
+  -1715,
+  -3220,
+  -4427,
+  27880,
+  -4427,
+  -3220,
+  -1715,
+  -432
+};
+
+// 1200Hz = -3dB, 2200Hz = 0dB; 1456Hz cutoff; cosine.
+q15_t dB3[] = {
+  -452,
+  -1582,
+  -2759,
+  -3646,
+  28792,
+  -3646,
+  -2759,
+  -1582,
+  -452
+};
+
+// 1200Hz = -2dB, 2200Hz = 0dB; 1070Hz cutoff; cosine.
+q15_t dB2[] = {
+  -408,
+  -1295,
+  -2123,
+  -2710,
+  29846,
+  -2710,
+  -2123,
+  -1295,
+  -408
+};
+
+// 1200Hz = -1dB, 2200Hz = 0dB; 605Hz cutoff; cosine.
+q15_t dB1[] = {
+  -268,
+  -795,
+  -1244,
+  -1546,
+  31116,
+  -1546,
+  -1244,
+  -795,
+  -268
+};
+
+q15_t dB0[] = {
+  0,
+  0,
+  0,
+  0,
+  32767,
+  0,
+  0,
+  0,
+  0,
+};
+
+// 1200Hz = 0dB, 2200Hz = -1dB; 4130Hz cutoff; cosine.
+q15_t dB_1[] = {
+  -419,
+  -177,
+  3316,
+  8650,
+  11278,
+  8650,
+  3316,
+  -177,
+  -419
+};
+
+// 1200Hz = 0dB, 2200Hz = -2dB; 3190Hz cutoff; cosine.
+q15_t dB_2[] = {
+  -90,
+  1033,
+  3975,
+  7267,
+  8711,
+  7267,
+  3975,
+  1033,
+  -90
+};
+
+// 1200Hz = 0dB, 2200Hz = -3dB; 2330Hz cutoff; cosine.
+q15_t dB_3[] = {
+  292,
+  1680,
+  3752,
+  5615,
+  6362,
+  5615,
+  3752,
+  1680,
+  292
+};
+
+// 1200Hz = 0dB, 2200Hz = -4dB; 2657Hz cutoff; boxcar.
+q15_t dB_4[] = {
+  917,
+  3024,
+  5131,
+  6684,
+  7255,
+  6684,
+  5131,
+  3024,
+  917
+};
+
+// 1200Hz = 0dB, 2200Hz = -5dB; 2360Hz cutoff; boxcar.
+q15_t dB_5[] = {
+  1620,
+  3339,
+  4925,
+  6042,
+  6444,
+  6042,
+  4925,
+  3339,
+  1620
+};
+
+// 1200Hz = 0dB, 2200Hz = -6dB; 2067Hz cutoff; boxcar.
+q15_t dB_6[] = {
+  2161,
+  3472,
+  4605,
+  5373,
+  5644,
+  5373,
+  4605,
+  3472,
+  2161
+};
+
+q15_t* coeffs[] = {
+  dB12,
+  dB11,
+  dB10,
+  dB9,
+  dB8,
+  dB7,
+  dB6,
+  dB5,
+  dB4,
+  dB3,
+  dB2,
+  dB1,
+  dB0,
+  dB_1,
+  dB_2,
+  dB_3,
+  dB_4,
+  dB_5,
+  dB_6
+};
+
+CAX25Twist::CAX25Twist(int8_t n) :
+m_filter(),
+m_state()
+{
+  setTwist(n);
+}
+
+void CAX25Twist::process(q15_t* in, q15_t* out, uint8_t length)
+{
+  ::arm_fir_fast_q15(&m_filter, in, out, length);
+}
+
+void CAX25Twist::setTwist(int8_t n)
+{
+  uint8_t twist = uint8_t(n + 6);
+
+  m_filter.numTaps = 9;
+  m_filter.pState  = m_state;
+  m_filter.pCoeffs = coeffs[twist];
+}
+

AX25Twist.h

@@ -0,0 +1,39 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(AX25Twist_H)
+#define  AX25Twist_H
+
+#include "Config.h"
+
+
+class CAX25Twist {
+public:
+  CAX25Twist(int8_t n);
+
+  void process(q15_t* in, q15_t* out, uint8_t length);
+
+  void setTwist(int8_t n);
+
+private:
+  arm_fir_instance_q15 m_filter;
+  q15_t                m_state[40U];   // NoTaps + BlockSize - 1, 9 + 20 - 1 plus some spare
+};
+
+#endif
+

CWIdTX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -77,6 +77,7 @@ const struct {
   {',', 0xEEAEE000U, 22U},
   {'-', 0xEAAE0000U, 18U},
   {'=', 0xEAB80000U, 16U},
+  {'.', 0xBAEB8000U, 20U},
   {' ', 0x00000000U, 4U},
   {0U,  0x00000000U, 0U}
 };
@@ -124,7 +125,7 @@ void CCWIdTX::process()
   }
 }
 
-uint8_t CCWIdTX::write(const uint8_t* data, uint8_t length)
+uint8_t CCWIdTX::write(const uint8_t* data, uint16_t length)
 {
   ::memset(m_poBuffer, 0x00U, 1000U * sizeof(uint8_t));
 
@@ -170,4 +171,3 @@ void CCWIdTX::reset()
   m_poPtr = 0U;
   m_n     = 0U;
 }
-

CWIdTX.h

@@ -1,6 +1,6 @@
 /*
  *   Copyright (C) 2009-2015 by Jonathan Naylor G4KLX
- *   Copyright (C) 2016 by Colin Durbridge G4EML
+ *   Copyright (C) 2016,2020 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -28,7 +28,7 @@ public:
 
   void process();
 
-  uint8_t write(const uint8_t* data, uint8_t length);
+  uint8_t write(const uint8_t* data, uint16_t length);
 
   void reset();
 

CalDMR.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2015 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2015,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -208,7 +208,7 @@ void CCalDMR::dmrdmo1k()
   }
 }
 
-uint8_t CCalDMR::write(const uint8_t* data, uint8_t length)
+uint8_t CCalDMR::write(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;

CalDMR.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2015 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2015,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -41,7 +41,7 @@ public:
   void createData1k(uint8_t n);
   void createDataDMO1k(uint8_t n);
 
-  uint8_t write(const uint8_t* data, uint8_t length);
+  uint8_t write(const uint8_t* data, uint16_t length);
 
 private:
   bool      m_transmit;

CalDStarTX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2016 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2016,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -162,7 +162,7 @@ void CCalDStarTX::process()
   m_count = (m_count + 1U) % (30U * 21U);
 }
 
-uint8_t CCalDStarTX::write(const uint8_t* data, uint8_t length)
+uint8_t CCalDStarTX::write(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;

CalDStarTX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -26,7 +26,7 @@ class CCalDStarTX {
 public:
   CCalDStarTX();
 
-  uint8_t write(const uint8_t* data, uint8_t length);
+  uint8_t write(const uint8_t* data, uint16_t length);
 
   void process();
 

CalFM.cpp

@@ -0,0 +1,127 @@
+/*
+ *   Copyright (C) 2009-2015,2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016 by Colin Durbridge G4EML
+ *   Copyright (C) 2020 by Phil Taylor M0VSE
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "CalFM.h"
+
+
+const struct TONE_TABLE {
+  uint16_t  frequency;
+  uint16_t length;
+  q31_t    increment;
+} TONE_TABLE_DATA[] = {
+  {2495U, 10U, 223248821},
+  {2079U, 12U, 186025772},
+  {1633U, 15U, 146118367},
+  {1247U, 19U, 111579672},
+  {1039U, 23U, 93012886},
+  {956U,  25U, 85541432}};
+
+const uint8_t TONE_TABLE_DATA_LEN = 6U;
+
+CCalFM::CCalFM() :
+m_frequency(0),
+m_length(0),
+m_tone(NULL),
+m_level(128 * 12),
+m_transmit(false),
+m_audioSeq(0),
+m_lastState(STATE_IDLE)
+{
+}
+
+void CCalFM::process()
+{
+  const TONE_TABLE* entry = NULL;
+
+  if (m_modemState != m_lastState)
+  {
+    switch (m_modemState) {
+        case STATE_FMCAL10K:
+          m_frequency = 956U;
+          break;
+        case STATE_FMCAL12K:
+          m_frequency = 1039U;
+          break;
+        case STATE_FMCAL15K:
+          m_frequency = 1247U;
+          break;
+        case STATE_FMCAL20K:
+          m_frequency = 1633U;
+          break;
+        case STATE_FMCAL25K:
+          m_frequency = 2079U;
+          break;
+        case STATE_FMCAL30K:
+          m_frequency = 2495U;
+          break;
+        default:
+          m_frequency = 0U;
+          break;
+    }
+
+    for (uint8_t i = 0U; i < TONE_TABLE_DATA_LEN; i++) {
+      if (TONE_TABLE_DATA[i].frequency == m_frequency) {
+        entry = TONE_TABLE_DATA + i;
+        break;
+      }
+    }
+
+    if (entry == NULL)
+      return;
+
+    m_length = entry->length;
+
+    delete[] m_tone;
+    m_tone = new q15_t[m_length];
+
+    q31_t arg = 0;
+    for (uint16_t i = 0U; i < m_length; i++) {
+      q63_t value = ::arm_sin_q31(arg) * q63_t(m_level);
+      m_tone[i] = q15_t(__SSAT((value >> 31), 16));
+
+      arg += entry->increment;
+    }
+
+    m_lastState=m_modemState;
+  }
+
+  if (m_transmit)
+  {
+    uint16_t space = io.getSpace();
+    while (space > m_length)
+    {
+      io.write(m_modemState,m_tone,m_length);
+      space -= m_length;
+    }
+  }
+}
+
+
+uint8_t CCalFM::write(const uint8_t* data, uint16_t length)
+{
+  if (length != 1U)
+    return 4U;
+
+  m_transmit = data[0U] == 1U;
+
+  return 0U;
+}

CalFM.h

@@ -0,0 +1,51 @@
+/*
+ *   Copyright (C) 2009-2015,2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016 by Colin Durbridge G4EML
+ *   Copyright (C) 2020 by Phil Taylor M0VSE
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(CALFM_H)
+#define  CALFM_H
+
+#include "Config.h"
+
+class CCalFM {
+public:
+  CCalFM();
+
+  void process();
+  void fm10kcal();
+  void fm12k5cal();
+  void fm15kcal();
+  void fm20kcal();
+  void fm25kcal();
+  void fm30kcal();
+
+  uint8_t write(const uint8_t* data, uint16_t length);
+
+private:
+  uint16_t  m_frequency;
+  uint16_t  m_length;
+  q15_t*    m_tone;
+  q15_t     m_level;
+  bool      m_transmit;
+  uint8_t   m_audioSeq;
+  uint8_t   m_lastState;
+};
+
+#endif
+

CalNXDN.cpp

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2018 by Andy Uribe CA6JAU
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -79,7 +80,7 @@ void CCalNXDN::process()
   }
 }
 
-uint8_t CCalNXDN::write(const uint8_t* data, uint8_t length)
+uint8_t CCalNXDN::write(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;

CalNXDN.h

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2018 by Andy Uribe CA6JAU
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -32,7 +33,7 @@ public:
 
   void process();
 
-  uint8_t write(const uint8_t* data, uint8_t length);
+  uint8_t write(const uint8_t* data, uint16_t length);
 
 private:
   bool      m_transmit;

CalP25.cpp

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2018 by Andy Uribe CA6JAU
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -82,7 +83,7 @@ void CCalP25::process()
   }
 }
 
-uint8_t CCalP25::write(const uint8_t* data, uint8_t length)
+uint8_t CCalP25::write(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;

CalP25.h

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2018 by Andy Uribe CA6JAU
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -34,7 +35,7 @@ public:
 
   void process();
 
-  uint8_t write(const uint8_t* data, uint8_t length);
+  uint8_t write(const uint8_t* data, uint16_t length);
 
 private:
   bool      m_transmit;

CalPOCSAG.cpp

@@ -0,0 +1,50 @@
+/*
+ *   Copyright (C) 2019 by Florian Wolters DF2ET
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "CalPOCSAG.h"
+
+
+CCalPOCSAG::CCalPOCSAG() :
+m_state(POCSAGCAL_IDLE)
+{
+}
+
+void CCalPOCSAG::process()
+{
+  if (m_state == POCSAGCAL_IDLE)
+    return;
+
+  uint16_t space = io.getSpace();
+  if (space <= 165U)
+    return;
+
+  pocsagTX.writeByte(0xAAU);
+}
+
+uint8_t CCalPOCSAG::write(const uint8_t* data, uint16_t length)
+{
+  if (length != 1U)
+    return 4U;
+
+  m_state = data[0U] == 1U ? POCSAGCAL_TX : POCSAGCAL_IDLE;
+
+  return 0U;
+}

CalPOCSAG.h

@@ -0,0 +1,42 @@
+/*
+ *   Copyright (C) 2019 by Florian Wolters DF2ET
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(CALPOCSAG_H)
+#define  CALPOCSAG_H
+
+#include "Config.h"
+
+enum POCSAGCAL {
+  POCSAGCAL_IDLE,
+  POCSAGCAL_TX
+};
+
+class CCalPOCSAG {
+public:
+  CCalPOCSAG();
+
+  void process();
+
+  uint8_t write(const uint8_t* data, uint16_t length);
+
+private:
+  POCSAGCAL m_state;
+};
+
+#endif

Config.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -35,20 +35,27 @@
 // For 19.2 MHz
 // #define EXTERNAL_OSC 19200000
 
+// Use a higher baudrate for host communication. Required for FM network !
+#define SERIAL_SPEED 115200 //suitable for most older boards (Arduino, Due STM32F1_POG etc). External FM will NOT work with this !
+// #define SERIAL_SPEED 230400 // Only works on newer board M4, M7, Teensy. External FM might work with this
+// #define SERIAL_SPEED 460800 // Only works on newer board M4, M7, Teensy. External FM should work with this
+
 // Allow the use of the COS line to lockout the modem
 // #define USE_COS_AS_LOCKOUT
 
-// Use pins to output the current mode
+// Use pins to output the current mode via LEDs
-// #define ARDUINO_MODE_PINS
+#define MODE_LEDS
 
 // For the original Arduino Due pin layout
 // #define ARDUINO_DUE_PAPA
 
+#if defined(STM32F1)
+// For the SQ6POG board
+#define STM32F1_POG
+#else
 // For the ZUM V1.0 and V1.0.1 boards pin layout
 #define ARDUINO_DUE_ZUM_V10
-
+#endif
-// For the SQ6POG board
-// #define STM32F1_POG
 
 // For the SP8NTH board
 // #define ARDUINO_DUE_NTH
@@ -57,8 +64,11 @@
 // #define STM32F4_NUCLEO_MORPHO_HEADER
 // #define STM32F4_NUCLEO_ARDUINO_HEADER
 
-// Use separate mode pins to switch external filters/bandwidth for example
+// Use separate mode pins to switch external channel/filters/bandwidth for example
-// #define STM32F4_NUCLEO_MODE_PINS
+// #define MODE_PINS
+
+// For the VK6MST Pi3 Shield communicating over i2c. i2c address & speed defined in i2cTeensy.cpp
+// #define VK6MST_TEENSY_PI3_SHIELD_I2C
 
 // Pass RSSI information to the host
 // #define SEND_RSSI_DATA
@@ -66,4 +76,21 @@
 // Use the modem as a serial repeater for Nextion displays
 // #define SERIAL_REPEATER
 
+// To reduce CPU load, you can remove the DC blocker by commenting out the next line
+#define USE_DCBLOCKER
+
+// Constant Service LED once repeater is running 
+// Do not use if employing an external hardware watchdog 
+// #define CONSTANT_SRV_LED
+
+// Use the YSF and P25 LEDs for NXDN
+// #define USE_ALTERNATE_NXDN_LEDS
+
+// Use the D-Star and DMR LEDs for POCSAG
+// #define USE_ALTERNATE_POCSAG_LEDS
+
+// Use the D-Star and YSF LEDs for FM
+#define USE_ALTERNATE_FM_LEDS
+
 #endif
+

DMRDMOTX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *   Copyright (C) 2017 by Andy Uribe CA6JAU
  *
@@ -38,6 +38,13 @@ const uint8_t BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02
 #define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
 #define READ_BIT1(p,i)    (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
 
+// PR FILL pattern
+const uint8_t PR_FILL[] =
+        {0x63U, 0xEAU, 0x00U, 0x76U, 0x6CU, 0x76U, 0xC4U, 0x52U, 0xC8U, 0x78U,
+         0x09U, 0x2DU, 0xB8U, 0x79U, 0x27U, 0x57U, 0x9BU, 0x31U, 0xBCU, 0x3EU,
+         0xEAU, 0x45U, 0xC3U, 0x30U, 0x49U, 0x17U, 0x93U, 0xAEU, 0x8BU, 0x6DU,
+         0xA4U, 0xA5U, 0xADU, 0xA2U, 0xF1U, 0x35U, 0xB5U, 0x3CU, 0x1EU};
+
 const uint8_t DMR_SYNC = 0x5FU;
 
 CDMRDMOTX::CDMRDMOTX() :
@@ -66,11 +73,11 @@ void CDMRDMOTX::process()
 
       m_poLen = m_txDelay;
     } else {
-      for (unsigned int i = 0U; i < 72U; i++)
-        m_poBuffer[i] = DMR_SYNC;
-
       for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
-        m_poBuffer[i + 39U] = m_fifo.get();
+        m_fifo.get(m_poBuffer[i]);
+
+      for (unsigned int i = 0U; i < 39U; i++)
+        m_poBuffer[i + DMR_FRAME_LENGTH_BYTES] = PR_FILL[i];
 
       m_poLen = 72U;
     }
@@ -97,7 +104,7 @@ void CDMRDMOTX::process()
   }
 }
 
-uint8_t CDMRDMOTX::writeData(const uint8_t* data, uint8_t length)
+uint8_t CDMRDMOTX::writeData(const uint8_t* data, uint16_t length)
 {
   if (length != (DMR_FRAME_LENGTH_BYTES + 1U))
     return 4U;

DMRDMOTX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -23,13 +23,13 @@
 #include "Config.h"
 #include "DMRDefines.h"
 
-#include "SerialRB.h"
+#include "RingBuffer.h"
 
 class CDMRDMOTX {
 public:
   CDMRDMOTX();
 
-  uint8_t writeData(const uint8_t* data, uint8_t length);
+  uint8_t writeData(const uint8_t* data, uint16_t length);
 
   void process();
 
@@ -38,7 +38,7 @@ public:
   uint8_t getSpace() const;
 
 private:
-  CSerialRB                        m_fifo;
+  CRingBuffer<uint8_t>                        m_fifo;
   arm_fir_interpolate_instance_q15 m_modFilter;
   q15_t                            m_modState[16U];    // blockSize + phaseLength - 1, 4 + 9 - 1 plus some spare
   uint8_t                          m_poBuffer[1200U];

DMRTX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *   Copyright (C) 2017 by Andy Uribe CA6JAU
  *
@@ -144,7 +144,7 @@ void CDMRTX::process()
   }
 }
 
-uint8_t CDMRTX::writeData1(const uint8_t* data, uint8_t length)
+uint8_t CDMRTX::writeData1(const uint8_t* data, uint16_t length)
 {
   if (length != (DMR_FRAME_LENGTH_BYTES + 1U))
     return 4U;
@@ -168,7 +168,7 @@ uint8_t CDMRTX::writeData1(const uint8_t* data, uint8_t length)
   return 0U;
 }
 
-uint8_t CDMRTX::writeData2(const uint8_t* data, uint8_t length)
+uint8_t CDMRTX::writeData2(const uint8_t* data, uint16_t length)
 {
   if (length != (DMR_FRAME_LENGTH_BYTES + 1U))
     return 4U;
@@ -192,7 +192,7 @@ uint8_t CDMRTX::writeData2(const uint8_t* data, uint8_t length)
   return 0U;
 }
 
-uint8_t CDMRTX::writeShortLC(const uint8_t* data, uint8_t length)
+uint8_t CDMRTX::writeShortLC(const uint8_t* data, uint16_t length)
 {
   if (length != 9U)
     return 4U;
@@ -208,7 +208,7 @@ uint8_t CDMRTX::writeShortLC(const uint8_t* data, uint8_t length)
   return 0U;
 }
 
-uint8_t CDMRTX::writeAbort(const uint8_t* data, uint8_t length)
+uint8_t CDMRTX::writeAbort(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;
@@ -293,7 +293,7 @@ void CDMRTX::createData(uint8_t slotIndex)
 {
   if (m_fifo[slotIndex].getData() >= DMR_FRAME_LENGTH_BYTES && m_frameCount >= STARTUP_COUNT && m_abortCount[slotIndex] >= ABORT_COUNT) {
     for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++) {
-      m_poBuffer[i]   = m_fifo[slotIndex].get();
+      m_fifo[slotIndex].get(m_poBuffer[i]);
       m_markBuffer[i] = MARK_NONE;
     }
   } else {

DMRTX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -23,7 +23,7 @@
 #include "Config.h"
 #include "DMRDefines.h"
 
-#include "SerialRB.h"
+#include "RingBuffer.h"
 
 enum DMRTXSTATE {
   DMRTXSTATE_IDLE,
@@ -38,11 +38,11 @@ class CDMRTX {
 public:
   CDMRTX();
 
-  uint8_t writeData1(const uint8_t* data, uint8_t length);
+  uint8_t writeData1(const uint8_t* data, uint16_t length);
-  uint8_t writeData2(const uint8_t* data, uint8_t length);
+  uint8_t writeData2(const uint8_t* data, uint16_t length);
 
-  uint8_t writeShortLC(const uint8_t* data, uint8_t length);
+  uint8_t writeShortLC(const uint8_t* data, uint16_t length);
-  uint8_t writeAbort(const uint8_t* data, uint8_t length);
+  uint8_t writeAbort(const uint8_t* data, uint16_t length);
 
   void setStart(bool start);
   void setCal(bool start);
@@ -59,7 +59,7 @@ public:
   void setColorCode(uint8_t colorCode);
 
 private:
-  CSerialRB                        m_fifo[2U];
+  CRingBuffer<uint8_t>                        m_fifo[2U];
   arm_fir_interpolate_instance_q15 m_modFilter;
   q15_t                            m_modState[16U];    // blockSize + phaseLength - 1, 4 + 9 - 1 plus some spare
   DMRTXSTATE                       m_state;

DStarTX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2017 by Andy Uribe CA6JAU
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -216,12 +216,13 @@ void CDStarTX::process()
       for (uint16_t i = 0U; i < m_txDelay; i++)
         m_poBuffer[m_poLen++] = BIT_SYNC;
     } else {
+      uint8_t dummy;
       // Pop the type byte off
-      m_buffer.get();
+      m_buffer.get(dummy);
 
       uint8_t header[DSTAR_HEADER_LENGTH_BYTES];
       for (uint8_t i = 0U; i < DSTAR_HEADER_LENGTH_BYTES; i++)
-        header[i] = m_buffer.get();
+        m_buffer.get(header[i]);
 
       uint8_t buffer[86U];
       txHeader(header, buffer + 2U);
@@ -239,17 +240,19 @@ void CDStarTX::process()
  
   if (type == DSTAR_DATA && m_poLen == 0U) {
     // Pop the type byte off
-    m_buffer.get();
+    uint8_t dummy;
+    m_buffer.get(dummy);
 
     for (uint8_t i = 0U; i < DSTAR_DATA_LENGTH_BYTES; i++)
-      m_poBuffer[m_poLen++] = m_buffer.get();
+      m_buffer.get(m_poBuffer[m_poLen++]);
 
     m_poPtr = 0U;
   }
 
   if (type == DSTAR_EOT && m_poLen == 0U) {
     // Pop the type byte off
-    m_buffer.get();
+    uint8_t dummy;
+    m_buffer.get(dummy);
 
     for (uint8_t j = 0U; j < 3U; j++) {
       for (uint8_t i = 0U; i < DSTAR_EOT_LENGTH_BYTES; i++)
@@ -277,7 +280,7 @@ void CDStarTX::process()
   }
 }
 
-uint8_t CDStarTX::writeHeader(const uint8_t* header, uint8_t length)
+uint8_t CDStarTX::writeHeader(const uint8_t* header, uint16_t length)
 {
   if (length != DSTAR_HEADER_LENGTH_BYTES)
     return 4U;
@@ -296,7 +299,7 @@ uint8_t CDStarTX::writeHeader(const uint8_t* header, uint8_t length)
   return 0U;
 }
 
-uint8_t CDStarTX::writeData(const uint8_t* data, uint8_t length)
+uint8_t CDStarTX::writeData(const uint8_t* data, uint16_t length)
 {
   if (length != DSTAR_DATA_LENGTH_BYTES)
     return 4U;
@@ -388,7 +391,7 @@ void CDStarTX::txHeader(const uint8_t* in, uint8_t* out) const
     if (i < 660U) {
       if (d & 0x08U)
         out[INTERLEAVE_TABLE_TX[i * 2U]] |= (0x01U << INTERLEAVE_TABLE_TX[i * 2U + 1U]);
-        i++;
+      i++;
 
       if (d & 0x04U)
         out[INTERLEAVE_TABLE_TX[i * 2U]] |= (0x01U << INTERLEAVE_TABLE_TX[i * 2U + 1U]);

DStarTX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -21,14 +21,14 @@
 
 #include "Config.h"
 
-#include "SerialRB.h"
+#include "RingBuffer.h"
 
 class CDStarTX {
 public:
   CDStarTX();
 
-  uint8_t writeHeader(const uint8_t* header, uint8_t length);
+  uint8_t writeHeader(const uint8_t* header, uint16_t length);
-  uint8_t writeData(const uint8_t* data, uint8_t length);
+  uint8_t writeData(const uint8_t* data, uint16_t length);
   uint8_t writeEOT();
 
   void process();
@@ -38,7 +38,7 @@ public:
   uint8_t getSpace() const;
 
 private:
-  CSerialRB                        m_buffer;
+  CRingBuffer<uint8_t>             m_buffer;
   arm_fir_interpolate_instance_q15 m_modFilter;
   q15_t                            m_modState[20U];    // blockSize + phaseLength - 1, 8 + 9 - 1 plus some spare
   uint8_t                          m_poBuffer[600U];

FM.h

@@ -0,0 +1,145 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FM_H)
+#define  FM_H
+
+#include "Config.h"
+
+#include "FMBlanking.h"
+#include "FMCTCSSRX.h"
+#include "FMCTCSSTX.h"
+#include "FMTimeout.h"
+#include "FMKeyer.h"
+#include "FMTimer.h"
+#include "RingBuffer.h"
+#include "FMDirectForm1.h"
+#include "FMDownSampler.h"
+#include "FMUpSampler.h"
+#include "FMNoiseSquelch.h"
+
+enum FM_STATE {
+  FS_LISTENING,
+  FS_KERCHUNK_RF,
+  FS_RELAYING_RF,
+  FS_RELAYING_WAIT_RF,
+  FS_TIMEOUT_RF,
+  FS_TIMEOUT_WAIT_RF,
+  FS_KERCHUNK_EXT,
+  FS_RELAYING_EXT,
+  FS_RELAYING_WAIT_EXT,
+  FS_TIMEOUT_EXT,
+  FS_TIMEOUT_WAIT_EXT,
+  FS_HANG
+};
+
+
+class CFM {
+public:
+  CFM();
+
+  void samples(bool cos, q15_t* samples, uint8_t length);
+
+  void process();
+
+  void reset();
+
+  uint8_t setCallsign(const char* callsign, uint8_t speed, uint16_t frequency, uint8_t time, uint8_t holdoff, uint8_t highLevel, uint8_t lowLevel, bool callsignAtStart, bool callsignAtEnd, bool callsignAtLatch);
+  uint8_t setAck(const char* rfAck, uint8_t speed, uint16_t frequency, uint8_t minTime, uint16_t delay, uint8_t level);
+  uint8_t setMisc(uint16_t timeout, uint8_t timeoutLevel, uint8_t ctcssFrequency, uint8_t ctcssHighThreshold, uint8_t ctcssLowThreshold, uint8_t ctcssLevel, uint8_t kerchunkTime, uint8_t hangTime, uint8_t accessMode, bool cosInvert, bool noiseSquelch, uint8_t squelchHighThreshold, uint8_t squelchLowThreshold, uint8_t rfAudioBoost, uint8_t maxDev, uint8_t rxLevel);
+  uint8_t setExt(const char* ack, uint8_t audioBoost, uint8_t speed, uint16_t frequency, uint8_t level);
+
+  uint8_t getSpace() const;
+
+  uint8_t writeData(const uint8_t* data, uint8_t length);
+
+private:
+  CFMKeyer             m_callsign;
+  CFMKeyer             m_rfAck;
+  CFMKeyer             m_extAck;
+  CFMCTCSSRX           m_ctcssRX;
+  CFMCTCSSTX           m_ctcssTX;
+  CFMNoiseSquelch      m_squelch;
+  CFMTimeout           m_timeoutTone;
+  FM_STATE             m_state;
+  bool                 m_callsignAtStart;
+  bool                 m_callsignAtEnd;
+  bool                 m_callsignAtLatch;
+  CFMTimer             m_callsignTimer;
+  CFMTimer             m_timeoutTimer;
+  CFMTimer             m_holdoffTimer;
+  CFMTimer             m_kerchunkTimer;
+  CFMTimer             m_ackMinTimer;
+  CFMTimer             m_ackDelayTimer;
+  CFMTimer             m_hangTimer;
+  CFMTimer             m_statusTimer;
+  CFMTimer             m_reverseTimer;
+  bool                 m_needReverse;
+  CFMDirectFormI       m_filterStage1;
+  CFMDirectFormI       m_filterStage2;
+  CFMDirectFormI       m_filterStage3;
+  CFMBlanking          m_blanking;
+  uint8_t              m_accessMode;
+  bool                 m_cosInvert;
+  bool                 m_noiseSquelch;
+  q15_t                m_rfAudioBoost;
+  q15_t                m_extAudioBoost;
+  CFMDownSampler       m_downSampler;
+  bool                 m_extEnabled;
+  q15_t                m_rxLevel;
+  CRingBuffer<q15_t>   m_inputRFRB;
+  CRingBuffer<q15_t>   m_outputRFRB;
+  CFMUpSampler         m_inputExtRB;
+
+  void stateMachine(bool validRFSignal, bool validExtSignal);
+
+  void duplexStateMachine(bool validRFSignal, bool validExtSignal);
+  void listeningStateDuplex(bool validRFSignal, bool validExtSignal);
+  void kerchunkRFStateDuplex(bool validSignal);
+  void relayingRFStateDuplex(bool validSignal);
+  void relayingRFWaitStateDuplex(bool validSignal);
+  void timeoutRFStateDuplex(bool validSignal);
+  void timeoutRFWaitStateDuplex(bool validSignal);
+  void kerchunkExtStateDuplex(bool validSignal);
+  void relayingExtStateDuplex(bool validSignal);
+  void relayingExtWaitStateDuplex(bool validSignal);
+  void timeoutExtStateDuplex(bool validSignal);
+  void timeoutExtWaitStateDuplex(bool validSignal);
+  void hangStateDuplex(bool validRFSignal, bool validExtSignal);
+
+  void simplexStateMachine(bool validRFSignal, bool validExtSignal);
+  void listeningStateSimplex(bool validRFSignal, bool validExtSignal);
+  void relayingRFStateSimplex(bool validSignal);
+  void relayingRFWaitStateSimplex(bool validSignal);
+  void timeoutRFStateSimplex(bool validSignal);
+  void timeoutRFWaitStateSimplex(bool validSignal);
+  void relayingExtStateSimplex(bool validSignal);
+  void relayingExtWaitStateSimplex(bool validSignal);
+  void timeoutExtStateSimplex(bool validSignal);
+  void timeoutExtWaitStateSimplex(bool validSignal);
+
+  void clock(uint8_t length);
+
+  void sendCallsign();
+  void beginRelaying();
+
+  void insertDelay(uint16_t ms);
+  void insertSilence(uint16_t ms);
+};
+
+#endif

FMBlanking.cpp

@@ -0,0 +1,82 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMBlanking.h"
+
+// 2000 Hz sine wave at 24000 Hz sample rate
+const q31_t TONE[] = {0, 16384, 28378, 32767, 28378, 16384, 0, -16383, -28377, -32767, -28377, -16383};
+
+const uint8_t TONE_LEN = 12U;
+
+const uint32_t BLEEP_LEN = 2400U;   // 100ms
+
+CFMBlanking::CFMBlanking() :
+m_posValue(0),
+m_negValue(0),
+m_level(128 * 128),
+m_running(false),
+m_pos(0U),
+m_n(0U)
+{
+}
+
+void CFMBlanking::setParams(uint8_t value, uint8_t level)
+{
+  m_posValue = q15_t(value * 128);
+  m_negValue = -m_posValue;
+
+  m_level = q15_t(level * 128);
+}
+
+q15_t CFMBlanking::process(q15_t sample)
+{
+  if (m_posValue == 0)
+    return sample;
+
+  if (!m_running) {
+    if (sample >= m_posValue) {
+      m_running = true;
+      m_pos = 0U;
+      m_n   = 0U;
+    } else if (sample <= m_negValue) {
+      m_running = true;
+      m_pos = 0U;
+      m_n   = 0U;
+    }
+  }
+
+  if (!m_running)
+    return sample;
+
+  if (m_pos <= BLEEP_LEN) {
+    q31_t value = TONE[m_n++] * m_level;
+    sample = q15_t(__SSAT((value >> 15), 16));
+    if (m_n >= TONE_LEN)
+      m_n = 0U;
+  } else {
+    sample = 0;
+  }
+
+  m_pos++;
+  if (m_pos >= 12000U)
+    m_running = false;
+
+  return sample;
+}

FMBlanking.h

@@ -0,0 +1,41 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMBlanking_H)
+#define  FMBlanking_H
+
+#include "Config.h"
+
+class CFMBlanking {
+public:
+  CFMBlanking();
+
+  void setParams(uint8_t value, uint8_t level);
+
+  q15_t process(q15_t sample);
+
+private:
+  q15_t    m_posValue;
+  q15_t    m_negValue;
+  q15_t    m_level;
+  bool     m_running;
+  uint32_t m_pos;
+  uint8_t  m_n;
+};
+
+#endif

FMCTCSSRX.cpp

@@ -0,0 +1,175 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMCTCSSRX.h"
+
+const struct RX_CTCSS_TABLE {
+  uint8_t frequency;
+  q63_t   coeffDivTwo;
+} RX_CTCSS_TABLE_DATA[] = {
+  { 67U, 2147153298},
+  { 69U, 2147130228},
+  { 71U, 2147103212},
+  { 74U, 2147076297},
+  { 77U, 2147047330},
+  { 79U, 2147016195},
+  { 82U, 2146982775},
+  { 85U, 2146946945},
+  { 88U, 2146907275},
+  { 91U, 2146867538},
+  { 94U, 2146822298},
+  { 97U, 2146785526},
+  {100U, 2146747759},
+  {103U, 2146695349},
+  {107U, 2146637984},
+  {110U, 2146578604},
+  {114U, 2146513835},
+  {118U, 2146445080},
+  {123U, 2146370355},
+  {127U, 2146291161},
+  {131U, 2146205372},
+  {136U, 2146112589},
+  {141U, 2146014479},
+  {146U, 2145910829},
+  {151U, 2145796971},
+  {156U, 2145676831},
+  {159U, 2145604646},
+  {162U, 2145547790},
+  {165U, 2145468230},
+  {167U, 2145409363},
+  {171U, 2145324517},
+  {173U, 2145261046},
+  {177U, 2145170643},
+  {179U, 2145102321},
+  {183U, 2145006080},
+  {186U, 2144932648},
+  {189U, 2144830280},
+  {192U, 2144748638},
+  {196U, 2144639788},
+  {199U, 2144555290},
+  {203U, 2144436713},
+  {206U, 2144346237},
+  {210U, 2144217348},
+  {218U, 2143983951},
+  {225U, 2143735870},
+  {229U, 2143622139},
+  {233U, 2143469001},
+  {241U, 2143182299},
+  {250U, 2142874683},
+  {254U, 2142733729}};
+
+const uint8_t CTCSS_TABLE_DATA_LEN = 50U;
+
+// 4Hz bandwidth
+const uint16_t N = 24000U / 4U;
+
+CFMCTCSSRX::CFMCTCSSRX() :
+m_coeffDivTwo(0),
+m_highThreshold(0),
+m_lowThreshold(0),
+m_count(0U),
+m_q0(0),
+m_q1(0),
+m_state(false)
+{
+}
+
+uint8_t CFMCTCSSRX::setParams(uint8_t frequency, uint8_t highThreshold, uint8_t lowThreshold)
+{
+  m_coeffDivTwo = 0;
+
+  for (uint8_t i = 0U; i < CTCSS_TABLE_DATA_LEN; i++) {
+    if (RX_CTCSS_TABLE_DATA[i].frequency == frequency) {
+      m_coeffDivTwo = RX_CTCSS_TABLE_DATA[i].coeffDivTwo;
+      break;
+    }
+  }
+
+  if (m_coeffDivTwo == 0)
+    return 4U;
+
+  m_highThreshold = q31_t(highThreshold);
+  m_lowThreshold  = q31_t(lowThreshold);
+
+  return 0U;
+}
+
+bool CFMCTCSSRX::process(q15_t sample)
+{
+  //get more dynamic into the decoder by multiplying the sample by 1.5
+  q31_t sample31 = q31_t(sample) +  (q31_t(sample) >> 1);
+
+  q31_t q2 = m_q1;
+  m_q1 = m_q0;
+
+  // Q31 multiplication, t3 = m_coeffDivTwo * 2 * m_q1
+  q63_t t1 = m_coeffDivTwo * m_q1;
+  q31_t t2 = __SSAT((t1 >> 31), 31);
+  q31_t t3 = t2 * 2;
+
+  // m_q0 = m_coeffDivTwo * m_q1 * 2 - q2 + sample
+  m_q0 = t3 - q2 + sample31;
+
+  m_count++;
+  if (m_count == N) {
+    // Q31 multiplication, t2 = m_q0 * m_q0
+    q63_t t1 = q63_t(m_q0) * q63_t(m_q0);
+    q31_t t2 = __SSAT((t1 >> 31), 31);
+
+    // Q31 multiplication, t4 = m_q0 * m_q0
+    q63_t t3 = q63_t(m_q1) * q63_t(m_q1);
+    q31_t t4 = __SSAT((t3 >> 31), 31);
+
+    // Q31 multiplication, t9 = m_q0 * m_q1 * m_coeffDivTwo * 2
+    q63_t t5 = q63_t(m_q0) * q63_t(m_q1);
+    q31_t t6 = __SSAT((t5 >> 31), 31);
+    q63_t t7 = t6 * m_coeffDivTwo;
+    q31_t t8 = __SSAT((t7 >> 31), 31);
+    q31_t t9  = t8 * 2;
+
+    // value = m_q0 * m_q0 + m_q1 * m_q1 - m_q0 * m_q1 * m_coeffDivTwo * 2
+    q31_t value = t2 + t4 - t9;
+
+    bool previousState = m_state;
+
+    q31_t threshold = m_highThreshold;
+    if (previousState)
+      threshold = m_lowThreshold;
+
+    m_state = value >= threshold;
+
+    if (previousState != m_state)
+      DEBUG4("CTCSS Value / Threshold / Valid", value, threshold, m_state);
+
+    m_count = 0U;
+    m_q0 = 0;
+    m_q1 = 0;
+  }
+
+  return m_state;
+}
+
+void CFMCTCSSRX::reset()
+{
+  m_q0 = 0;
+  m_q1 = 0;
+  m_state = false;
+  m_count = 0U;
+}

FMCTCSSRX.h

@@ -0,0 +1,44 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMCTCSSRX_H)
+#define  FMCTCSSRX_H
+
+#include "Config.h"
+
+class CFMCTCSSRX {
+public:
+  CFMCTCSSRX();
+
+  uint8_t setParams(uint8_t frequency, uint8_t highThreshold, uint8_t lowThreshold);
+  
+  bool process(q15_t sample);
+
+  void reset();
+
+private:
+  q63_t    m_coeffDivTwo;
+  q31_t    m_highThreshold;
+  q31_t    m_lowThreshold;
+  uint16_t m_count;
+  q31_t    m_q0;
+  q31_t    m_q1;
+  bool     m_state;
+};
+
+#endif

FMCTCSSTX.cpp

@@ -0,0 +1,128 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMCTCSSTX.h"
+
+const struct TX_CTCSS_TABLE {
+  uint8_t  frequency;
+  uint16_t length;
+  q31_t    increment;
+} TX_CTCSS_TABLE_DATA[] = {
+  { 67U, 358U, 5995059},
+  { 69U, 346U, 6200860},
+  { 71U, 334U, 6433504},
+  { 74U, 323U, 6657200},
+  { 77U, 312U, 6889844},
+  { 79U, 301U, 7131436},
+  { 82U, 291U, 7381976},
+  { 85U, 281U, 7641463},
+  { 88U, 271U, 7918846},
+  { 91U, 262U, 8187282},
+  { 94U, 253U, 8482561},
+  { 97U, 246U, 8715205},
+  {100U, 240U, 8947849},
+  {103U, 232U, 9261024},
+  {107U, 224U, 9592094},
+  {110U, 216U, 9923165},
+  {114U, 209U, 10272131},
+  {118U, 202U, 10630045},
+  {123U, 195U, 11005854},
+  {127U, 189U, 11390612},
+  {131U, 182U, 11793265},
+  {136U, 176U, 12213814},
+  {141U, 170U, 12643310},
+  {146U, 164U, 13081755},
+  {151U, 159U, 13547043},
+  {156U, 153U, 14021279},
+  {159U, 150U, 14298662},
+  {162U, 148U, 14513411},
+  {165U, 145U, 14808690},
+  {167U, 143U, 15023438},
+  {171U, 140U, 15327665},
+  {173U, 138U, 15551361},
+  {177U, 135U, 15864536},
+  {179U, 133U, 16097180},
+  {183U, 131U, 16419303},
+  {186U, 129U, 16660894},
+  {189U, 126U, 16991965},
+  {192U, 124U, 17251452},
+  {196U, 122U, 17591471},
+  {199U, 120U, 17850958},
+  {203U, 118U, 18208872},
+  {206U, 116U, 18477308},
+  {210U, 114U, 18853117},
+  {218U, 110U, 19515258},
+  {225U, 106U, 20195295},
+  {229U, 105U, 20499521},
+  {233U, 103U, 20902175},
+  {241U,  99U, 21635898},
+  {250U,  96U, 22396465},
+  {254U,  94U, 22736484}};
+
+const uint8_t CTCSS_TABLE_DATA_LEN = 50U;
+
+CFMCTCSSTX::CFMCTCSSTX() :
+m_values(NULL),
+m_length(0U),
+m_n(0U)
+{
+}
+
+uint8_t CFMCTCSSTX::setParams(uint8_t frequency, uint8_t level)
+{
+  const TX_CTCSS_TABLE* entry = NULL;
+
+  for (uint8_t i = 0U; i < CTCSS_TABLE_DATA_LEN; i++) {
+    if (TX_CTCSS_TABLE_DATA[i].frequency == frequency) {
+      entry = TX_CTCSS_TABLE_DATA + i;
+      break;
+    }
+  }
+
+  if (entry == NULL)
+    return 4U;
+
+  m_length = entry->length;
+
+  delete[] m_values;
+  m_values = new q15_t[m_length];
+
+  q31_t arg = 0;
+  for (uint16_t i = 0U; i < m_length; i++) {
+    q63_t value = ::arm_sin_q31(arg) * q63_t(level * 13);
+    m_values[i] = q15_t(__SSAT((value >> 31), 16));
+
+    arg += entry->increment;
+  }
+
+  return 0U;
+}
+
+q15_t CFMCTCSSTX::getAudio(bool reverse)
+{
+  q15_t sample = m_values[m_n++];
+  if (m_n >= m_length)
+    m_n = 0U;
+  
+  if (reverse)
+    return -sample;
+  else
+    return sample;
+}

FMCTCSSTX.h

@@ -0,0 +1,38 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMCTCSSTX_H)
+#define  FMCTCSSTX_H
+
+#include "Config.h"
+
+class CFMCTCSSTX {
+public:
+  CFMCTCSSTX();
+
+  uint8_t setParams(uint8_t frequency, uint8_t level);
+
+  q15_t getAudio(bool reverse);
+
+private:
+  q15_t*   m_values;
+  uint16_t m_length;
+  uint16_t m_n;
+};
+
+#endif

FMDirectForm1.h

@@ -0,0 +1,111 @@
+
+/*******************************************************************************
+This header file has been taken from:
+"A Collection of Useful C++ Classes for Digital Signal Processing"
+By Vinnie Falco 
+Bernd Porr adapted it for Linux and turned it into a filter using
+fixed point arithmetic.
+--------------------------------------------------------------------------------
+License: MIT License (http://www.opensource.org/licenses/mit-license.php)
+Copyright (c) 2009 by Vinnie Falco
+Copyright (C) 2013-2017, Bernd Porr, [email protected]
+Copyright (C) 2020 , Mario Molitor , [email protected]
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*******************************************************************************/
+
+// based on https://raw.githubusercontent.com/berndporr/iir_fixed_point/master/DirectFormI.h
+
+#include <cstdint>
+
+#ifndef DIRECTFORMI_H_
+#define DIRECTFORMI_H_
+class CFMDirectFormI
+{
+public:
+
+	// convenience function which takes the a0 argument but ignores it!
+	CFMDirectFormI(const q31_t b0, const q31_t b1, const q31_t b2,
+			const q31_t, const q31_t a1, const q31_t a2)
+	{
+		// FIR coefficients
+		c_b0 = b0;
+		c_b1 = b1;
+		c_b2 = b2;
+		// IIR coefficients
+		c_a1 = a1;
+		c_a2 = a2;
+		reset();
+	}
+
+	CFMDirectFormI(const CFMDirectFormI &my)
+	{
+	// delay line
+		m_x2 = my.m_x2; // x[n-2]
+		m_y2 = my.m_y2; // y[n-2]
+		m_x1 = my.m_x1; // x[n-1]
+		m_y1 = my.m_y1; // y[n-1]
+
+	// coefficients
+		c_b0 = my.c_b0;
+		c_b1 = my.c_b1;
+		c_b2 = my.c_b2; // FIR
+		c_a1 = my.c_a1;
+		c_a2 = my.c_a2; // IIR
+    }
+
+	void reset ()
+	{
+		m_x1 = 0;
+		m_x2 = 0;
+		m_y1 = 0;
+		m_y2 = 0;
+	}
+
+	// filtering operation: one sample in and one out
+	inline q15_t filter(const q15_t in)
+	{
+		// calculate the output
+		register q31_t out_upscaled = c_b0 * in
+									+ c_b1 * m_x1
+									+ c_b2 * m_x2
+									- c_a1 * m_y1
+									- c_a2 * m_y2;
+
+		q15_t out = __SSAT(out_upscaled >> 15, 15);
+
+		// update the delay lines
+		m_x2 = m_x1;
+		m_y2 = m_y1;
+		m_x1 = in;
+		m_y1 = out;
+
+		return out;
+	}
+
+private:
+	// delay line
+	q31_t m_x2; // x[n-2]
+	q31_t m_y2; // y[n-2]
+	q31_t m_x1; // x[n-1]
+	q31_t m_y1; // y[n-1]
+
+	// coefficients
+	q31_t c_b0,c_b1,c_b2; // FIR
+	q31_t c_a1,c_a2; // IIR
+};
+
+#endif /* DIRECTFORMI_H */

FMDownSampler.cpp

@@ -0,0 +1,74 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "FMDownSampler.h"
+
+CFMDownSampler::CFMDownSampler(uint16_t length) :
+m_ringBuffer(length),
+m_samplePack(0U),
+m_samplePackPointer(NULL),
+m_sampleIndex(0U)
+{
+  m_samplePackPointer = (uint8_t*)&m_samplePack;
+}
+
+void CFMDownSampler::addSample(q15_t sample)
+{
+  uint32_t usample = uint32_t(int32_t(sample) + 2048);
+  //only take one of three samples
+  switch(m_sampleIndex){
+    case 0:
+      m_samplePack = usample << 12;
+    break;
+    case 3:{
+      m_samplePack |= usample;
+      
+      //we did not use MSB; skip it
+      TSamplePairPack pair{m_samplePackPointer[0U], m_samplePackPointer[1U], m_samplePackPointer[2U]}; 
+
+      m_ringBuffer.put(pair);
+
+      m_samplePack = 0U;//reset the sample pack
+    }
+    break;
+    default:
+        //Just skip this sample
+    break;
+  }
+
+  m_sampleIndex++;
+  if (m_sampleIndex >= 6U)//did we pack two samples ?
+      m_sampleIndex = 0U;  
+}
+
+bool CFMDownSampler::getPackedData(TSamplePairPack& data)
+{
+  return m_ringBuffer.get(data);
+}
+
+uint16_t CFMDownSampler::getData()
+{
+  return m_ringBuffer.getData();
+}
+
+void CFMDownSampler::reset()
+{
+  m_sampleIndex = 0U;
+}

FMDownSampler.h

@@ -0,0 +1,47 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMDOWNSAMPLER_H)
+#define FMDOWNSAMPLER_H
+
+#include "Config.h"
+#include "RingBuffer.h"
+#include "FMSamplePairPack.h"
+
+class CFMDownSampler {
+public:
+  CFMDownSampler(uint16_t length);
+
+  void addSample(q15_t sample);
+
+  bool getPackedData(TSamplePairPack& data);
+
+  uint16_t getData();
+
+  void reset();
+
+private:
+  CRingBuffer<TSamplePairPack> m_ringBuffer;
+  uint32_t                     m_samplePack;
+  uint8_t*                     m_samplePackPointer;
+  uint8_t                      m_sampleIndex;
+};
+
+#endif
+

FMKeyer.cpp

@@ -0,0 +1,216 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMKeyer.h"
+
+const struct {
+  char     c;
+  uint32_t pattern;
+  uint8_t  length;
+} SYMBOL_LIST[] = {
+  {'A', 0xB8000000U, 8U},
+  {'B', 0xEA800000U, 12U},
+  {'C', 0xEBA00000U, 14U},
+  {'D', 0xEA000000U, 10U},
+  {'E', 0x80000000U, 4U},
+  {'F', 0xAE800000U, 12U},
+  {'G', 0xEE800000U, 12U},
+  {'H', 0xAA000000U, 10U},
+  {'I', 0xA0000000U, 6U},
+  {'J', 0xBBB80000U, 16U},
+  {'K', 0xEB800000U, 12U},
+  {'L', 0xBA800000U, 12U},
+  {'M', 0xEE000000U, 10U},
+  {'N', 0xE8000000U, 8U},
+  {'O', 0xEEE00000U, 14U},
+  {'P', 0xBBA00000U, 14U},
+  {'Q', 0xEEB80000U, 16U},
+  {'R', 0xBA000000U, 10U},
+  {'S', 0xA8000000U, 8U},
+  {'T', 0xE0000000U, 6U},
+  {'U', 0xAE000000U, 10U},
+  {'V', 0xAB800000U, 12U},
+  {'W', 0xBB800000U, 12U},
+  {'X', 0xEAE00000U, 14U},
+  {'Y', 0xEBB80000U, 16U},
+  {'Z', 0xEEA00000U, 14U},
+  {'1', 0xBBBB8000U, 20U},
+  {'2', 0xAEEE0000U, 18U},
+  {'3', 0xABB80000U, 16U},
+  {'4', 0xAAE00000U, 14U},
+  {'5', 0xAA800000U, 12U},
+  {'6', 0xEAA00000U, 14U},
+  {'7', 0xEEA80000U, 16U},
+  {'8', 0xEEEA0000U, 18U},
+  {'9', 0xEEEE8000U, 20U},
+  {'0', 0xEEEEE000U, 22U},
+  {'/', 0xEAE80000U, 16U},
+  {'?', 0xAEEA0000U, 18U},
+  {',', 0xEEAEE000U, 22U},
+  {'-', 0xEAAE0000U, 18U},
+  {'=', 0xEAB80000U, 16U},
+  {'.', 0xBAEB8000U, 20U},
+  {' ', 0x00000000U, 4U},
+  {0U,  0x00000000U, 0U}
+};
+
+const uint8_t BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
+
+#define WRITE_BIT_FM(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
+#define READ_BIT_FM(p,i)    (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
+
+CFMKeyer::CFMKeyer() :
+m_wanted(false),
+m_poBuffer(),
+m_poLen(0U),
+m_poPos(0U),
+m_dotLen(0U),
+m_dotPos(0U),
+m_audio(NULL),
+m_audioLen(0U),
+m_audioPos(0U),
+m_highLevel(0U),
+m_lowLevel(0)
+{
+}
+
+uint8_t CFMKeyer::setParams(const char* text, uint8_t speed, uint16_t frequency, uint8_t highLevel, uint8_t lowLevel)
+{
+  m_poLen = 0U;
+
+  for (uint8_t i = 0U; text[i] != '\0'; i++) {
+    for (uint8_t j = 0U; SYMBOL_LIST[j].c != 0U; j++) {
+      if (SYMBOL_LIST[j].c == text[i]) {
+        uint32_t MASK = 0x80000000U;
+        for (uint8_t k = 0U; k < SYMBOL_LIST[j].length; k++, m_poLen++, MASK >>= 1) {
+          bool b = (SYMBOL_LIST[j].pattern & MASK) == MASK;
+          WRITE_BIT_FM(m_poBuffer, m_poLen, b);
+
+          if (m_poLen >= 995U) {
+            m_poLen = 0U;
+            return 4U;
+          }
+        }
+
+        break;
+      }
+    }
+  }
+
+  m_highLevel = q15_t(highLevel);
+  m_lowLevel  = q15_t(lowLevel);
+
+  m_dotLen = 24000U / speed;   // In samples
+
+  m_audioLen = 24000U / frequency; // In samples
+
+  delete[] m_audio;
+  m_audio = new bool[m_audioLen];
+
+  for (uint16_t i = 0U; i < m_audioLen; i++) {
+    if (i < (m_audioLen / 2U))
+      m_audio[i] = true;
+    else
+      m_audio[i] = false;
+  }
+
+  return 0U;
+}
+
+q15_t CFMKeyer::getHighAudio()
+{
+  q15_t output = 0U;
+  if (!m_wanted)
+    return 0U;
+
+  bool b = READ_BIT_FM(m_poBuffer, m_poPos);
+  if (b)
+    output = m_audio[m_audioPos] ? m_highLevel : -m_highLevel;
+
+  m_audioPos++;
+  if (m_audioPos >= m_audioLen)
+    m_audioPos = 0U;
+  m_dotPos++;
+  if (m_dotPos >= m_dotLen) {
+    m_dotPos = 0U;
+    m_poPos++;
+    if (m_poPos >= m_poLen) {
+      stop();
+      return output;
+    }
+  }
+
+  return output;
+}
+
+q15_t CFMKeyer::getLowAudio()
+{
+  q15_t output = 0U;
+  if (!m_wanted)
+    return 0U;
+
+  bool b = READ_BIT_FM(m_poBuffer, m_poPos);
+  if (b)
+    output = m_audio[m_audioPos] ? m_lowLevel : -m_lowLevel;
+
+  m_audioPos++;
+  if (m_audioPos >= m_audioLen)
+    m_audioPos = 0U;
+  m_dotPos++;
+  if (m_dotPos >= m_dotLen) {
+    m_dotPos = 0U;
+    m_poPos++;
+    if (m_poPos >= m_poLen) {
+      stop();
+      return output;
+    }
+  }
+
+  return output;
+}
+
+void CFMKeyer::start()
+{
+  if (isRunning())
+    return;
+
+  m_wanted   = true;
+  m_poPos    = 0U;
+  m_dotPos   = 0U;
+  m_audioPos = 0U;
+}
+
+void CFMKeyer::stop()
+{
+  m_wanted   = false;
+  m_poPos    = 0U;
+  m_dotPos   = 0U;
+  m_audioPos = 0U;
+}
+
+bool CFMKeyer::isWanted() const
+{
+  return m_wanted;
+}
+
+bool CFMKeyer::isRunning() const
+{
+  return m_poPos > 0U || m_dotPos > 0U || m_audioPos > 0U;
+}

FMKeyer.h

@@ -0,0 +1,54 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMKeyer_H)
+#define  FMKeyer_H
+
+#include "Config.h"
+
+class CFMKeyer {
+public:
+  CFMKeyer();
+
+  uint8_t setParams(const char* text, uint8_t speed, uint16_t frequency, uint8_t highLevel, uint8_t lowLevel);
+
+  q15_t getHighAudio();
+  q15_t getLowAudio();
+
+  void start();
+  void stop();
+
+  bool isRunning() const;
+
+  bool isWanted() const;
+
+private:
+  bool     m_wanted;
+  uint8_t  m_poBuffer[1000U];
+  uint16_t m_poLen;
+  uint16_t m_poPos;
+  uint16_t m_dotLen;
+  uint16_t m_dotPos;
+  bool*    m_audio;
+  uint16_t m_audioLen;
+  uint16_t m_audioPos;
+  q15_t    m_highLevel;
+  q15_t    m_lowLevel;
+};
+
+#endif

FMNoiseSquelch.cpp

@@ -0,0 +1,127 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMNoiseSquelch.h"
+
+// 4500Hz centre frequency
+const q31_t COEFF_DIV_TWO = 821806413;
+
+// 400Hz bandwidth
+const uint16_t N = 24000U / 400U;
+
+CFMNoiseSquelch::CFMNoiseSquelch() :
+m_highThreshold(0),
+m_lowThreshold(0),
+m_count(0U),
+m_q0(0),
+m_q1(0),
+m_state(false),
+m_validCount(0U)
+{
+
+}
+
+void CFMNoiseSquelch::setParams(uint8_t highThreshold, uint8_t lowThreshold)
+{
+  m_highThreshold = q31_t(highThreshold);
+  m_lowThreshold  = q31_t(lowThreshold);
+}
+
+bool CFMNoiseSquelch::process(q15_t sample)
+{
+  //get more dynamic into the decoder by multiplying the sample by 64
+  q31_t sample31 = q31_t(sample) << 6; //+  (q31_t(sample) >> 1);
+
+  q31_t q2 = m_q1;
+  m_q1 = m_q0;
+
+  // Q31 multiplication, t3 = m_coeffDivTwo * 2 * m_q1
+  q63_t t1 = COEFF_DIV_TWO * m_q1;
+  q31_t t2 = __SSAT((t1 >> 31), 31);
+  q31_t t3 = t2 * 2;
+
+  // m_q0 = m_coeffDivTwo * m_q1 * 2 - q2 + sample
+  m_q0 = t3 - q2 + sample31;
+
+  m_count++;
+  if (m_count == N) {
+    // Q31 multiplication, t2 = m_q0 * m_q0
+    q63_t t1 = q63_t(m_q0) * q63_t(m_q0);
+    q31_t t2 = __SSAT((t1 >> 31), 31);
+
+    // Q31 multiplication, t4 = m_q0 * m_q0
+    q63_t t3 = q63_t(m_q1) * q63_t(m_q1);
+    q31_t t4 = __SSAT((t3 >> 31), 31);
+
+    // Q31 multiplication, t9 = m_q0 * m_q1 * m_coeffDivTwo * 2
+    q63_t t5 = q63_t(m_q0) * q63_t(m_q1);
+    q31_t t6 = __SSAT((t5 >> 31), 31);
+    q63_t t7 = t6 * COEFF_DIV_TWO;
+    q31_t t8 = __SSAT((t7 >> 31), 31);
+    q31_t t9  = t8 * 2;
+
+    // value = m_q0 * m_q0 + m_q1 * m_q1 - m_q0 * m_q1 * m_coeffDivTwo * 2
+    q31_t value = t2 + t4 - t9;
+
+    bool previousState = m_state;
+
+    q31_t threshold = m_highThreshold;
+    if (previousState)
+      threshold = m_lowThreshold;
+
+    if (!m_state) {
+      if (value < threshold)
+        m_validCount++;
+      else
+        m_validCount = 0U;
+    }
+
+    if (m_state) {
+      if (value >= threshold)
+        m_invalidCount++;
+      else
+        m_invalidCount = 0U;
+    }
+
+    m_state = m_validCount >= 10U && m_invalidCount < 10U;
+
+    if(previousState && !m_state)
+      m_invalidCount = 0U;
+
+    if (previousState != m_state) {
+      DEBUG4("Noise Squelch Value / Threshold / Valid", value, threshold, m_state);
+      DEBUG3("Valid Count / Invalid Count", m_validCount, m_invalidCount);
+    }
+
+    m_count = 0U;
+    m_q0 = 0;
+    m_q1 = 0;
+  }
+
+  return m_state;
+}
+
+void CFMNoiseSquelch::reset()
+{
+  m_q0 = 0;
+  m_q1 = 0;
+  m_state = false;
+  m_count = 0U;
+}

FMNoiseSquelch.h

@@ -0,0 +1,45 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMNOISESQUELCH_H)
+#define  FMNOISESQUELCH_H
+
+#include "Config.h"
+
+class CFMNoiseSquelch {
+public:
+  CFMNoiseSquelch();
+
+  void setParams(uint8_t highThreshold, uint8_t lowThreshold);
+  
+  bool process(q15_t sample);
+
+  void reset();
+
+private:
+  q31_t    m_highThreshold;
+  q31_t    m_lowThreshold;
+  uint16_t m_count;
+  q31_t    m_q0;
+  q31_t    m_q1;
+  bool     m_state;
+  uint8_t  m_validCount;
+  uint8_t  m_invalidCount;
+};
+
+#endif

FMSamplePairPack.h

@@ -0,0 +1,29 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(TSAMPLEPACK_H)
+#define TSAMPLEPACK_H
+
+struct TSamplePairPack {
+  uint8_t byte0;
+  uint8_t byte1;
+  uint8_t byte2;
+};
+
+#endif

FMTimeout.cpp

@@ -0,0 +1,74 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMTimeout.h"
+
+// 400 Hz sine wave at 24000 Hz sample rate
+const q15_t BUSY_AUDIO[] = {0, 3426, 6813, 10126, 13328, 16384, 19261, 21926, 24351, 26510, 28378, 29935, 31164, 32052, 32588, 32767, 32588, 32052, 31164, 29935, 28378, 26510, 24351,
+                            21926, 19261, 16384, 13328, 10126, 6813, 3425, 0, -3425, -6813, -10126, -13328, -16384, -19261, -21926, -24351, -26510, -28378, -29935, -31164, -32052,
+                            -32588, -32768, -32588, -32052, -31164, -29935, -28378, -26510, -24351, -21926, -19261, -16384, -13328, -10126, -6813, -3425};
+const uint8_t BUSY_AUDIO_LEN = 60U;
+
+CFMTimeout::CFMTimeout() :
+m_level(128 * 128),
+m_running(false),
+m_pos(0U),
+m_n(0U)
+{
+}
+
+void CFMTimeout::setParams(uint8_t level)
+{
+  m_level = q15_t(level * 5);
+}
+
+q15_t CFMTimeout::getAudio()
+{
+  q15_t sample = 0;
+  if (!m_running)
+    return sample;
+
+  if (m_pos >= 12000U) {
+    q31_t sample31 = BUSY_AUDIO[m_n] * m_level;
+    sample = q15_t(__SSAT((sample31 >> 15), 16));
+
+    m_n++;
+    if (m_n >= BUSY_AUDIO_LEN)
+      m_n = 0U;
+  }
+
+  m_pos++;
+  if (m_pos >= 24000U)
+    m_pos = 0U;
+
+  return sample;
+}
+
+void CFMTimeout::start()
+{
+  m_running = true;
+  m_pos = 0U;
+  m_n   = 0U;
+}
+
+void CFMTimeout::stop()
+{
+  m_running = false;
+}

FMTimeout.h

@@ -0,0 +1,42 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMTimeout_H)
+#define  FMTimeout_H
+
+#include "Config.h"
+
+class CFMTimeout {
+public:
+  CFMTimeout();
+
+  void setParams(uint8_t level);
+
+  void start();
+  void stop();
+
+  q15_t getAudio();
+
+private:
+  q15_t    m_level;
+  bool     m_running;
+  uint32_t m_pos;
+  uint8_t  m_n;
+};
+
+#endif

FMTimer.cpp

@@ -0,0 +1,70 @@
+/*
+ *   Copyright (C) 2009,2010,2015,2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "FMTimer.h"
+
+CFMTimer::CFMTimer() :
+m_timeout(0U),
+m_timer(0U)
+{
+}
+
+void CFMTimer::setTimeout(uint16_t secs, uint32_t msecs)
+{
+  m_timeout = (secs * 24000U) + (msecs * 24U);
+}
+
+uint32_t CFMTimer::getTimeout() const
+{
+  return m_timeout / 24U;
+}
+
+void CFMTimer::start()
+{
+  if (m_timeout > 0U)
+    m_timer = 1U;
+}
+
+void CFMTimer::stop()
+{
+  m_timer = 0U;
+}
+
+void CFMTimer::clock(uint8_t length)
+{
+  if (m_timer > 0U && m_timeout > 0U)
+    m_timer += length;
+}
+
+bool CFMTimer::isRunning() const
+{
+  return m_timer > 0U;
+}
+
+bool CFMTimer::hasExpired() const
+{
+  if (m_timeout == 0U || m_timer == 0U)
+    return false;
+
+  if (m_timer > m_timeout)
+    return true;
+
+  return false;
+}

FMTimer.h

@@ -0,0 +1,47 @@
+/*
+ *   Copyright (C) 2009,2010,2015,2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(FMTimer_H)
+#define  FMTimer_H
+
+#include "Config.h"
+
+class CFMTimer {
+public:
+  CFMTimer();
+
+  void setTimeout(uint16_t secs, uint32_t msecs);
+
+  uint32_t getTimeout() const;
+
+  void start();
+  
+  void stop();
+
+  void clock(uint8_t length);
+
+  bool isRunning() const;
+  
+  bool hasExpired() const;
+
+private:
+  uint32_t m_timeout;
+  uint32_t m_timer;
+};
+
+#endif

FMUpSampler.cpp

@@ -0,0 +1,97 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "FMUpSampler.h"
+
+const uint32_t FM_UPSAMPLE_MASK = 0x00000FFFU;
+
+CFMUpSampler::CFMUpSampler() :
+m_upSampleIndex(0),
+m_pack(0U),
+m_packPointer(NULL),
+m_samples(3600U), //300ms of 12 bit 8kHz audio
+m_running(false)
+{
+  m_packPointer = (uint8_t*)&m_pack;
+}
+
+void CFMUpSampler::reset()
+{
+    m_upSampleIndex = 0U;
+    m_pack = 0U;
+    m_samples.reset();
+    m_running = false;
+}
+
+void CFMUpSampler::addData(const uint8_t* data, uint16_t length)
+{
+  TSamplePairPack* packPointer = (TSamplePairPack*)data;
+  TSamplePairPack* packPointerEnd = packPointer + (length / 3U);
+  while(packPointer != packPointerEnd) {
+    m_samples.put(*packPointer);
+    packPointer++;
+  }
+  if(!m_running)
+    m_running = m_samples.getData() > 300U;//75ms of audio
+}
+
+bool CFMUpSampler::getSample(q15_t& sample)
+{
+  if(!m_running)
+    return false;
+
+  switch (m_upSampleIndex)
+  {
+  case 0: {
+    TSamplePairPack pairPack;
+    if(!m_samples.get(pairPack)) {
+      m_running = false;
+      return false;
+    }
+      
+    m_pack = 0U;
+    m_packPointer = (uint8_t*)&m_pack;
+
+    m_packPointer[0U] = pairPack.byte0;
+    m_packPointer[1U] = pairPack.byte1;
+    m_packPointer[2U] = pairPack.byte2;
+
+    sample = q15_t(m_pack >> 12) - 2048;
+    break;
+  }
+  case 3:
+    sample = q15_t(m_pack & FM_UPSAMPLE_MASK) - 2048;
+  break;
+  default:
+    sample = 0;
+  break;
+  }
+
+  m_upSampleIndex++;
+  if(m_upSampleIndex >= 6U)
+    m_upSampleIndex = 0U;
+
+  return true;
+}
+
+uint16_t CFMUpSampler::getSpace() const
+{
+  //return available space in bytes
+  return m_samples.getSpace() * sizeof(TSamplePairPack);
+}

FMUpSampler.h

@@ -0,0 +1,48 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#if !defined(FMUPSAMPLER_H)
+#define FMUPSAMPLER_H
+
+#include "Config.h"
+#include "RingBuffer.h"
+#include "FMSamplePairPack.h"
+
+class CFMUpSampler {
+public:
+  CFMUpSampler();
+
+  void reset();
+
+  void addData(const uint8_t* data, uint16_t length);
+
+  bool getSample(q15_t& sample);
+
+  uint16_t getSpace() const;
+
+private:
+  uint8_t m_upSampleIndex;
+  uint32_t m_pack;
+  uint8_t * m_packPointer;
+  CRingBuffer<TSamplePairPack> m_samples;
+  bool m_running;
+};
+
+#endif

Globals.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -28,6 +28,7 @@
 #include "STM32Utils.h"
 #else
 #include <Arduino.h>
+#undef PI //Undefine PI to get rid of annoying warning as it is also defined in arm_math.h.
 #endif
 
 #if defined(__SAM3X8E__) || defined(STM32F105xC)
@@ -49,6 +50,9 @@ enum MMDVM_STATE {
   STATE_YSF       = 3,
   STATE_P25       = 4,
   STATE_NXDN      = 5,
+  STATE_POCSAG    = 6,
+  STATE_FM        = 10,
+  STATE_AX25      = 11,
 
   // Dummy states start at 90
   STATE_NXDNCAL1K = 91,
@@ -59,7 +63,15 @@ enum MMDVM_STATE {
   STATE_RSSICAL   = 96,
   STATE_CWID      = 97,
   STATE_DMRCAL    = 98,
-  STATE_DSTARCAL  = 99
+  STATE_DSTARCAL  = 99,
+  STATE_INTCAL    = 100,
+  STATE_POCSAGCAL = 101,
+  STATE_FMCAL10K  = 102,
+  STATE_FMCAL12K  = 103,
+  STATE_FMCAL15K  = 104,
+  STATE_FMCAL20K  = 105,
+  STATE_FMCAL25K  = 106,
+  STATE_FMCAL30K  = 107
 };
 
 #include "SerialPort.h"
@@ -76,15 +88,21 @@ enum MMDVM_STATE {
 #include "P25TX.h"
 #include "NXDNRX.h"
 #include "NXDNTX.h"
+#include "POCSAGTX.h"
 #include "CalDStarRX.h"
 #include "CalDStarTX.h"
+#include "CalFM.h"
 #include "CalDMR.h"
 #include "CalP25.h"
 #include "CalNXDN.h"
+#include "CalPOCSAG.h"
 #include "CalRSSI.h"
 #include "CWIdTX.h"
+#include "AX25RX.h"
+#include "AX25TX.h"
 #include "Debug.h"
 #include "IO.h"
+#include "FM.h"
 
 const uint8_t  MARK_SLOT1 = 0x08U;
 const uint8_t  MARK_SLOT2 = 0x04U;
@@ -95,6 +113,12 @@ const uint16_t RX_BLOCK_SIZE = 2U;
 const uint16_t TX_RINGBUFFER_SIZE = 500U;
 const uint16_t RX_RINGBUFFER_SIZE = 600U;
 
+#if defined(STM32F105xC) || defined(__MK20DX256__)
+const uint16_t TX_BUFFER_LEN = 2000U;
+#else
+const uint16_t TX_BUFFER_LEN = 4000U;
+#endif
+
 extern MMDVM_STATE m_modemState;
 
 extern bool m_dstarEnable;
@@ -102,6 +126,9 @@ extern bool m_dmrEnable;
 extern bool m_ysfEnable;
 extern bool m_p25Enable;
 extern bool m_nxdnEnable;
+extern bool m_pocsagEnable;
+extern bool m_fmEnable;
+extern bool m_ax25Enable;
 
 extern bool m_duplex;
 
@@ -130,11 +157,19 @@ extern CP25TX p25TX;
 extern CNXDNRX nxdnRX;
 extern CNXDNTX nxdnTX;
 
+extern CPOCSAGTX pocsagTX;
+
+extern CFM     fm;
+extern CAX25RX ax25RX;
+extern CAX25TX ax25TX;
+
 extern CCalDStarRX calDStarRX;
 extern CCalDStarTX calDStarTX;
 extern CCalDMR     calDMR;
+extern CCalFM      calFM;
 extern CCalP25     calP25;
 extern CCalNXDN    calNXDN;
+extern CCalPOCSAG  calPOCSAG;
 extern CCalRSSI    calRSSI;
 
 extern CCWIdTX cwIdTX;

I2CTeensy.cpp

@@ -0,0 +1,235 @@
+/*
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *   28-4-2017 Created for MMDVM Pi shield for Teensy by Chris Huitema
+ */
+
+#include "Config.h"
+#include "Globals.h"
+
+#if defined(VK6MST_TEENSY_PI3_SHIELD_I2C)
+
+#include <i2c_t3.h>   //available here https://github.com/nox771/i2c_t3 or maybe the normal wire will work #include <wire.h> justs need to test i guess
+
+#define I2C_ADDRESS   0x22
+#define I2C_SPEED     100000
+
+// Function prototypes
+void receiveEvent(size_t count);
+void requestEvent(void);
+
+#define TX_FIFO_SIZE 512U
+#define RX_FIFO_SIZE 512U
+
+volatile uint8_t  TXfifo[TX_FIFO_SIZE];
+volatile uint8_t  RXfifo[RX_FIFO_SIZE];
+volatile uint16_t TXfifohead, TXfifotail;
+volatile uint16_t RXfifohead, RXfifotail;
+
+// Init queues
+void TXfifoinit(void)
+{
+   TXfifohead = 0U;
+   TXfifotail = 0U;
+}
+
+void RXfifoinit()
+{
+   RXfifohead = 0U;
+   RXfifotail = 0U;
+}
+
+// How full is queue
+
+uint16_t TXfifolevel(void)
+{
+   uint32_t tail = TXfifotail;
+   uint32_t head = TXfifohead;
+
+   if (tail > head)
+      return TX_FIFO_SIZE + head - tail;
+   else
+      return head - tail;
+}
+
+uint16_t RXfifolevel(void)
+{
+   uint32_t tail = RXfifotail;
+   uint32_t head = RXfifohead;
+
+   if (tail > head)
+      return RX_FIFO_SIZE + head - tail;
+   else
+      return head - tail;
+}
+
+
+uint8_t TXfifoput(uint8_t next)
+{
+   if (TXfifolevel() < TX_FIFO_SIZE) {
+      TXfifo[TXfifohead] = next;
+
+      TXfifohead++;
+      if (TXfifohead >= TX_FIFO_SIZE)
+         TXfifohead = 0U;
+      return 1U;
+   } else {
+      return 0U; // signal an overflow occurred by returning a zero count
+   }
+}
+
+void I2Cbegin(void)
+{
+  // Setup for Slave mode, address 0x22, pins 18/19, external pullups, speed in hz
+  Wire.begin(I2C_SLAVE, I2C_ADDRESS, I2C_PINS_18_19, I2C_PULLUP_EXT, I2C_SPEED);
+
+    // register events
+    Wire.onReceive(receiveEvent);
+    Wire.onRequest(requestEvent);
+
+    // initialize the fifos
+    TXfifoinit();
+    RXfifoinit();
+}
+
+
+int I2Cavailable(void)
+{
+  if (RXfifolevel() > 0U)
+      return 1U;
+    else
+      return 0U;
+}
+
+
+uint8_t I2Cread(void)
+{
+  uint8_t data_c = RXfifo[RXfifotail];
+
+   RXfifotail++;
+   if (RXfifotail >= RX_FIFO_SIZE)
+      RXfifotail = 0U;
+
+   return data_c;
+}
+
+
+void I2Cwrite(const uint8_t* data, uint16_t length)
+{
+   for (uint16_t i = 0U; i < length; i++)
+      TXfifoput(data[i]);   //puts it in the fifo
+}
+
+//
+// handle Rx Event (incoming I2C data)
+//
+void receiveEvent(size_t count)
+{
+  for (uint16_t i = 0U; i < count; i++)
+  {
+    if (RXfifolevel() < RX_FIFO_SIZE) {
+      RXfifo[RXfifohead] = Wire.readByte();
+      if (RXfifo[RXfifohead] != -1){
+        RXfifohead++;
+        if (RXfifohead >= RX_FIFO_SIZE) RXfifohead = 0U;
+      }
+    } else {
+      Wire.readByte();                  // drop data if mem full.
+    }
+    
+  }
+}
+
+//
+// handle Tx Event (outgoing I2C data)
+//
+void requestEvent(void)
+{
+    if (TXfifolevel() > 0) {
+      if (Wire.write(TXfifo[TXfifotail])){  //write to i2c
+        TXfifotail++;
+        if (TXfifotail >= TX_FIFO_SIZE) TXfifotail = 0U;
+      }  
+    }
+}
+
+
+
+/************************************/
+
+void CSerialPort::beginInt(uint8_t n, int speed)
+{
+  switch (n) {
+    case 1U:
+      return I2Cbegin();
+    case 3U:
+      Serial3.begin(speed);
+      break;
+    default:
+      break;
+  }
+}
+
+int CSerialPort::availableInt(uint8_t n)
+{
+  switch (n) {
+    case 1U:
+      return I2Cavailable();
+    case 3U:
+      return Serial3.available();
+    default:
+      return false;
+  }
+}
+
+int CSerialPort::availableForWriteInt(uint8_t n)
+{
+  switch (n) {
+    case 3U:
+      return Serial3.availableForWrite();
+    default:
+      return false;
+  }
+}
+
+uint8_t CSerialPort::readInt(uint8_t n)
+{
+  switch (n) {
+    case 1U:
+      return I2Cread();
+    case 3U:
+      return Serial3.read();
+    default:
+      return 0U;
+  }
+}
+
+void CSerialPort::writeInt(uint8_t n, const uint8_t* data, uint16_t length, bool flush)
+{
+  switch (n) {
+    case 1U:
+      I2Cwrite(data, length);
+      break;
+    case 3U:
+      Serial3.write(data, length);
+      if (flush)
+        Serial3.flush();
+      break;
+    default:
+      break;
+  }
+}
+
+#endif

IO.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2015 by Jim Mclaughlin KI6ZUM
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
@@ -61,18 +61,16 @@ m_txBuffer(TX_RINGBUFFER_SIZE),
 m_rssiBuffer(RX_RINGBUFFER_SIZE),
 m_dcFilter(),
 m_dcState(),
-m_dmrFilter(),
+m_rrcFilter(),
 m_gaussianFilter(),
 m_boxcarFilter(),
 m_nxdnFilter(),
 m_nxdnISincFilter(),
-m_ysfFilter(),
+m_rrcState(),
-m_dmrState(),
 m_gaussianState(),
 m_boxcarState(),
 m_nxdnState(),
 m_nxdnISincState(),
-m_ysfState(),
 m_pttInvert(false),
 m_rxLevel(128 * 128),
 m_cwIdTXLevel(128 * 128),
@@ -81,8 +79,12 @@ m_dmrTXLevel(128 * 128),
 m_ysfTXLevel(128 * 128),
 m_p25TXLevel(128 * 128),
 m_nxdnTXLevel(128 * 128),
+m_pocsagTXLevel(128 * 128),
+m_fmTXLevel(128 * 128),
+m_ax25TXLevel(128 * 128),
 m_rxDCOffset(DC_OFFSET),
 m_txDCOffset(DC_OFFSET),
+m_useCOSAsLockout(false),
 m_ledCount(0U),
 m_ledValue(true),
 m_detect(false),
@@ -91,12 +93,11 @@ m_dacOverflow(0U),
 m_watchdog(0U),
 m_lockout(false)
 {
-  ::memset(m_dmrState,      0x00U,  70U * sizeof(q15_t));
+  ::memset(m_rrcState,      0x00U,  70U * sizeof(q15_t));
   ::memset(m_gaussianState, 0x00U,  40U * sizeof(q15_t));
   ::memset(m_boxcarState,   0x00U,  30U * sizeof(q15_t));
   ::memset(m_nxdnState,     0x00U, 110U * sizeof(q15_t));
   ::memset(m_nxdnISincState, 0x00U, 60U * sizeof(q15_t));
-  ::memset(m_ysfState,      0x00U,  70U * sizeof(q15_t));
   ::memset(m_dcState,       0x00U,   4U * sizeof(q31_t));
 
   m_dcFilter.numStages = DC_FILTER_STAGES;
@@ -104,9 +105,9 @@ m_lockout(false)
   m_dcFilter.pCoeffs   = DC_FILTER;
   m_dcFilter.postShift = 0;
 
-  m_dmrFilter.numTaps = RRC_0_2_FILTER_LEN;
+  m_rrcFilter.numTaps = RRC_0_2_FILTER_LEN;
-  m_dmrFilter.pState  = m_dmrState;
+  m_rrcFilter.pState  = m_rrcState;
-  m_dmrFilter.pCoeffs = RRC_0_2_FILTER;
+  m_rrcFilter.pCoeffs = RRC_0_2_FILTER;
 
   m_gaussianFilter.numTaps = GAUSSIAN_0_5_FILTER_LEN;
   m_gaussianFilter.pState  = m_gaussianState;
@@ -124,10 +125,6 @@ m_lockout(false)
   m_nxdnISincFilter.pState  = m_nxdnISincState;
   m_nxdnISincFilter.pCoeffs = NXDN_ISINC_FILTER;
 
-  m_ysfFilter.numTaps = RRC_0_2_FILTER_LEN;
-  m_ysfFilter.pState  = m_ysfState;
-  m_ysfFilter.pCoeffs = RRC_0_2_FILTER;
-
   initInt();
   
   selfTest();
@@ -137,101 +134,95 @@ void CIO::selfTest()
 {
   bool ledValue = false;
 
-  for (uint8_t i = 0; i < 6; i++) {
+  for (uint8_t i = 0U; i < 6U; i++) {
     ledValue = !ledValue;
 
     // We exclude PTT to avoid trigger the transmitter
     setLEDInt(ledValue);
     setCOSInt(ledValue);
-#if defined(ARDUINO_MODE_PINS)
+#if defined(MODE_LEDS)
     setDStarInt(ledValue);
     setDMRInt(ledValue);
     setYSFInt(ledValue);
     setP25Int(ledValue);
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
     setNXDNInt(ledValue);
+#endif
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+    setPOCSAGInt(ledValue);
+#endif
+#if !defined(USE_ALTERNATE_FM_LEDS)
+    setFMInt(ledValue);
+#endif
 #endif
     delayInt(250);
   }
 
-#if defined(ARDUINO_MODE_PINS)
+#if defined(MODE_LEDS)
-  setDStarInt(true);
-  setDMRInt(false);
-  setYSFInt(false);
-  setP25Int(false);
-  setNXDNInt(false);
-
-  delayInt(250);
-
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(false);
-  setP25Int(false);
-  setNXDNInt(false);
-
-  delayInt(250);
-
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(true);
-  setP25Int(false);
-  setNXDNInt(false);
-  
-  delayInt(250);
-
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(true);
-  setP25Int(true);
-  setNXDNInt(false);
-  
-  delayInt(250);
-
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(true);
-  setP25Int(true);
-  setNXDNInt(true);
-  
-  delayInt(250);
-
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(true);
-  setP25Int(true);
-  setNXDNInt(false);
-
-  delayInt(250);
-  
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(true);
-  setP25Int(false);
-  setNXDNInt(false);
-
-  delayInt(250);
-
-  setDStarInt(true);
-  setDMRInt(true);
-  setYSFInt(false);
-  setP25Int(false);
-  setNXDNInt(false);
-
-  delayInt(250);
-  
-  setDStarInt(true);
-  setDMRInt(false);
-  setYSFInt(false);
-  setP25Int(false);
-  setNXDNInt(false);
-
-  delayInt(250);
-
   setDStarInt(false);
   setDMRInt(false);
   setYSFInt(false);
   setP25Int(false);
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
   setNXDNInt(false);
 #endif
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  setPOCSAGInt(false);
+#endif
+#if !defined(USE_ALTERNATE_FM_LEDS)
+  setFMInt(false);
+#endif
+  setDStarInt(true);
+
+  delayInt(250);
+  setDMRInt(true);
+
+  delayInt(250);
+  setYSFInt(true);
+
+  delayInt(250);
+  setP25Int(true);
+
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
+  delayInt(250);
+  setNXDNInt(true);
+#endif
+
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  delayInt(250);
+  setPOCSAGInt(true);
+#endif
+
+#if !defined(USE_ALTERNATE_FM_LEDS)
+  delayInt(250);
+  setFMInt(true);
+
+  delayInt(250);
+  setFMInt(false);
+#endif
+
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  delayInt(250);
+  setPOCSAGInt(false);
+#endif
+
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
+  delayInt(250);
+  setNXDNInt(false);
+#endif
+
+  delayInt(250);
+  setP25Int(false);
+
+  delayInt(250);
+  setYSFInt(false);
+
+  delayInt(250);
+  setDMRInt(false);
+
+  delayInt(250);
+  setDStarInt(false);
+#endif
 }
 
 void CIO::start()
@@ -243,7 +234,7 @@ void CIO::start()
 
   m_started = true;
 
-  setMode();
+  setMode(STATE_IDLE);
 }
 
 void CIO::process()
@@ -252,21 +243,24 @@ void CIO::process()
   if (m_started) {
     // Two seconds timeout
     if (m_watchdog >= 48000U) {
-      if (m_modemState == STATE_DSTAR || m_modemState == STATE_DMR || m_modemState == STATE_YSF || m_modemState == STATE_P25 || m_modemState == STATE_NXDN) {
+      if (m_modemState == STATE_DSTAR || m_modemState == STATE_DMR || m_modemState == STATE_YSF || m_modemState == STATE_P25 || m_modemState == STATE_NXDN || m_modemState == STATE_POCSAG) {
         if (m_modemState == STATE_DMR && m_tx)
           dmrTX.setStart(false);
-        m_modemState = STATE_IDLE;
+        setMode(STATE_IDLE);
-        setMode();
       }
 
       m_watchdog = 0U;
     }
 
+#if defined(CONSTANT_SRV_LED)
+    setLEDInt(true);
+#else
     if (m_ledCount >= 24000U) {
       m_ledCount = 0U;
       m_ledValue = !m_ledValue;
       setLEDInt(m_ledValue);
     }
+#endif
   } else {
     if (m_ledCount >= 240000U) {
       m_ledCount = 0U;
@@ -276,14 +270,14 @@ void CIO::process()
     return;
   }
 
-#if defined(USE_COS_AS_LOCKOUT)
+  if (m_useCOSAsLockout)
-  m_lockout = getCOSInt();
+    m_lockout = getCOSInt();
-#endif
 
   // Switch off the transmitter if needed
   if (m_txBuffer.getData() == 0U && m_tx) {
     m_tx = false;
     setPTTInt(m_pttInvert ? true : false);
+    DEBUG1("TX OFF");
   }
 
   if (m_rxBuffer.getData() >= RX_BLOCK_SIZE) {
@@ -292,15 +286,16 @@ void CIO::process()
     uint16_t rssi[RX_BLOCK_SIZE];
 
     for (uint16_t i = 0U; i < RX_BLOCK_SIZE; i++) {
-      uint16_t sample;
+      TSample sample;
-      m_rxBuffer.get(sample, control[i]);
+      m_rxBuffer.get(sample);
+      control[i] = sample.control;
       m_rssiBuffer.get(rssi[i]);
 
       // Detect ADC overflow
-      if (m_detect && (sample == 0U || sample == 4095U))
+      if (m_detect && (sample.sample == 0U || sample.sample == 4095U))
         m_adcOverflow++;
 
-      q15_t res1 = q15_t(sample) - m_rxDCOffset;
+      q15_t res1 = q15_t(sample.sample) - m_rxDCOffset;
       q31_t res2 = res1 * m_rxLevel;
       samples[i] = q15_t(__SSAT((res2 >> 15), 16));
     }
@@ -308,13 +303,14 @@ void CIO::process()
     if (m_lockout)
       return;
 
-    q31_t dcLevel = 0;
+#if defined(USE_DCBLOCKER)
-    q31_t dcValues[RX_BLOCK_SIZE];
     q31_t q31Samples[RX_BLOCK_SIZE];
-
     ::arm_q15_to_q31(samples, q31Samples, RX_BLOCK_SIZE);
+
+    q31_t dcValues[RX_BLOCK_SIZE];
     ::arm_biquad_cascade_df1_q31(&m_dcFilter, q31Samples, dcValues, RX_BLOCK_SIZE);
 
+    q31_t dcLevel = 0;
     for (uint8_t i = 0U; i < RX_BLOCK_SIZE; i++)
       dcLevel += dcValues[i];
     dcLevel /= RX_BLOCK_SIZE;
@@ -324,58 +320,87 @@ void CIO::process()
     q15_t dcSamples[RX_BLOCK_SIZE];
     for (uint8_t i = 0U; i < RX_BLOCK_SIZE; i++)
       dcSamples[i] = samples[i] - offset;
+#endif
 
     if (m_modemState == STATE_IDLE) {
       if (m_dstarEnable) {
         q15_t GMSKVals[RX_BLOCK_SIZE];
+#if defined(USE_DCBLOCKER)
         ::arm_fir_fast_q15(&m_gaussianFilter, dcSamples, GMSKVals, RX_BLOCK_SIZE);
-
+#else
+        ::arm_fir_fast_q15(&m_gaussianFilter, samples, GMSKVals, RX_BLOCK_SIZE);
+#endif
         dstarRX.samples(GMSKVals, rssi, RX_BLOCK_SIZE);
       }
 
       if (m_p25Enable) {
         q15_t P25Vals[RX_BLOCK_SIZE];
+#if defined(USE_DCBLOCKER)
         ::arm_fir_fast_q15(&m_boxcarFilter, dcSamples, P25Vals, RX_BLOCK_SIZE);
-
+#else
+        ::arm_fir_fast_q15(&m_boxcarFilter, samples, P25Vals, RX_BLOCK_SIZE);
+#endif
         p25RX.samples(P25Vals, rssi, RX_BLOCK_SIZE);
       }
 
       if (m_nxdnEnable) {
-        q15_t NXDNVals[RX_BLOCK_SIZE];
         q15_t NXDNValsTmp[RX_BLOCK_SIZE];
+#if defined(USE_DCBLOCKER)
         ::arm_fir_fast_q15(&m_nxdnFilter, dcSamples, NXDNValsTmp, RX_BLOCK_SIZE);
+#else
+        ::arm_fir_fast_q15(&m_nxdnFilter, samples, NXDNValsTmp, RX_BLOCK_SIZE);
+#endif
+        q15_t NXDNVals[RX_BLOCK_SIZE];
         ::arm_fir_fast_q15(&m_nxdnISincFilter, NXDNValsTmp, NXDNVals, RX_BLOCK_SIZE);
 
         nxdnRX.samples(NXDNVals, rssi, RX_BLOCK_SIZE);
       }
 
-      if (m_ysfEnable) {
+      if (m_dmrEnable || m_ysfEnable) {
-        q15_t YSFVals[RX_BLOCK_SIZE];
+        q15_t RRCVals[RX_BLOCK_SIZE];
-        ::arm_fir_fast_q15(&m_ysfFilter, dcSamples, YSFVals, RX_BLOCK_SIZE);
+        ::arm_fir_fast_q15(&m_rrcFilter, samples, RRCVals, RX_BLOCK_SIZE);
 
-        ysfRX.samples(YSFVals, rssi, RX_BLOCK_SIZE);
+        if (m_ysfEnable)
+          ysfRX.samples(RRCVals, rssi, RX_BLOCK_SIZE);
+
+        if (m_dmrEnable) {
+          if (m_duplex)
+            dmrIdleRX.samples(RRCVals, RX_BLOCK_SIZE);
+          else
+            dmrDMORX.samples(RRCVals, rssi, RX_BLOCK_SIZE);
+        }
       }
 
-      if (m_dmrEnable) {
+      if (m_fmEnable) {
-        q15_t DMRVals[RX_BLOCK_SIZE];
+        bool cos = getCOSInt();
-        ::arm_fir_fast_q15(&m_dmrFilter, samples, DMRVals, RX_BLOCK_SIZE);
+#if defined(USE_DCBLOCKER)
+        fm.samples(cos, dcSamples, RX_BLOCK_SIZE);
+#else
+        fm.samples(cos, samples, RX_BLOCK_SIZE);
+#endif
+      }
 
-        if (m_duplex)
+      if (m_ax25Enable) {
-          dmrIdleRX.samples(DMRVals, RX_BLOCK_SIZE);
+#if defined(USE_DCBLOCKER)
-        else
+        ax25RX.samples(dcSamples, RX_BLOCK_SIZE);
-          dmrDMORX.samples(DMRVals, rssi, RX_BLOCK_SIZE);
+#else
+        ax25RX.samples(samples, RX_BLOCK_SIZE);
+#endif
       }
     } else if (m_modemState == STATE_DSTAR) {
       if (m_dstarEnable) {
         q15_t GMSKVals[RX_BLOCK_SIZE];
+#if defined(USE_DCBLOCKER)
         ::arm_fir_fast_q15(&m_gaussianFilter, dcSamples, GMSKVals, RX_BLOCK_SIZE);
-
+#else
+        ::arm_fir_fast_q15(&m_gaussianFilter, samples, GMSKVals, RX_BLOCK_SIZE);
+#endif
         dstarRX.samples(GMSKVals, rssi, RX_BLOCK_SIZE);
       }
     } else if (m_modemState == STATE_DMR) {
       if (m_dmrEnable) {
         q15_t DMRVals[RX_BLOCK_SIZE];
-        ::arm_fir_fast_q15(&m_dmrFilter, samples, DMRVals, RX_BLOCK_SIZE);
+        ::arm_fir_fast_q15(&m_rrcFilter, samples, DMRVals, RX_BLOCK_SIZE);
 
         if (m_duplex) {
           // If the transmitter isn't on, use the DMR idle RX to detect the wakeup CSBKs
@@ -390,26 +415,47 @@ void CIO::process()
     } else if (m_modemState == STATE_YSF) {
       if (m_ysfEnable) {
         q15_t YSFVals[RX_BLOCK_SIZE];
-        ::arm_fir_fast_q15(&m_ysfFilter, dcSamples, YSFVals, RX_BLOCK_SIZE);
+#if defined(USE_DCBLOCKER)
-
+        ::arm_fir_fast_q15(&m_rrcFilter, dcSamples, YSFVals, RX_BLOCK_SIZE);
+#else
+        ::arm_fir_fast_q15(&m_rrcFilter, samples, YSFVals, RX_BLOCK_SIZE);
+#endif
         ysfRX.samples(YSFVals, rssi, RX_BLOCK_SIZE);
       }
     } else if (m_modemState == STATE_P25) {
       if (m_p25Enable) {
         q15_t P25Vals[RX_BLOCK_SIZE];
+#if defined(USE_DCBLOCKER)
         ::arm_fir_fast_q15(&m_boxcarFilter, dcSamples, P25Vals, RX_BLOCK_SIZE);
-
+#else
+        ::arm_fir_fast_q15(&m_boxcarFilter, samples, P25Vals, RX_BLOCK_SIZE);
+#endif
         p25RX.samples(P25Vals, rssi, RX_BLOCK_SIZE);
       }
     } else if (m_modemState == STATE_NXDN) {
       if (m_nxdnEnable) {
-        q15_t NXDNVals[RX_BLOCK_SIZE];
         q15_t NXDNValsTmp[RX_BLOCK_SIZE];
+#if defined(USE_DCBLOCKER)
         ::arm_fir_fast_q15(&m_nxdnFilter, dcSamples, NXDNValsTmp, RX_BLOCK_SIZE);
+#else
+        ::arm_fir_fast_q15(&m_nxdnFilter, samples, NXDNValsTmp, RX_BLOCK_SIZE);
+#endif
+        q15_t NXDNVals[RX_BLOCK_SIZE];
         ::arm_fir_fast_q15(&m_nxdnISincFilter, NXDNValsTmp, NXDNVals, RX_BLOCK_SIZE);
 
         nxdnRX.samples(NXDNVals, rssi, RX_BLOCK_SIZE);
       }
+    } else if (m_modemState == STATE_FM) {
+      bool cos = getCOSInt();
+#if defined(USE_DCBLOCKER)
+      fm.samples(cos, dcSamples, RX_BLOCK_SIZE);
+      if (m_ax25Enable)
+        ax25RX.samples(dcSamples, RX_BLOCK_SIZE);
+#else
+      fm.samples(cos, samples, RX_BLOCK_SIZE);
+      if (m_ax25Enable)
+        ax25RX.samples(samples, RX_BLOCK_SIZE);
+#endif
     } else if (m_modemState == STATE_DSTARCAL) {
       q15_t GMSKVals[RX_BLOCK_SIZE];
       ::arm_fir_fast_q15(&m_gaussianFilter, samples, GMSKVals, RX_BLOCK_SIZE);
@@ -433,6 +479,7 @@ void CIO::write(MMDVM_STATE mode, q15_t* samples, uint16_t length, const uint8_t
   if (!m_tx) {
     m_tx = true;
     setPTTInt(m_pttInvert ? false : true);
+    DEBUG1("TX ON");
   }
 
   q15_t txLevel = 0;
@@ -452,6 +499,15 @@ void CIO::write(MMDVM_STATE mode, q15_t* samples, uint16_t length, const uint8_t
     case STATE_NXDN:
       txLevel = m_nxdnTXLevel;
       break;
+    case STATE_POCSAG:
+      txLevel = m_pocsagTXLevel;
+      break;
+    case STATE_FM:
+      txLevel = m_fmTXLevel;
+      break;
+    case STATE_AX25:
+      txLevel = m_ax25TXLevel;
+      break;
     default:
       txLevel = m_cwIdTXLevel;
       break;
@@ -467,9 +523,9 @@ void CIO::write(MMDVM_STATE mode, q15_t* samples, uint16_t length, const uint8_t
       m_dacOverflow++;
 
     if (control == NULL)
-      m_txBuffer.put(res3, MARK_NONE);
+      m_txBuffer.put({res3, MARK_NONE});
     else
-      m_txBuffer.put(res3, control[i]);
+      m_txBuffer.put({res3, control[i]});
   }
 }
 
@@ -491,41 +547,66 @@ void CIO::setADCDetection(bool detect)
   m_detect = detect;
 }
 
-void CIO::setMode()
+void CIO::setMode(MMDVM_STATE state)
 {
-#if defined(ARDUINO_MODE_PINS)
+  if (state == m_modemState)
-  setDStarInt(m_modemState == STATE_DSTAR);
+    return;
-  setDMRInt(m_modemState   == STATE_DMR);
+
-  setYSFInt(m_modemState   == STATE_YSF);
+#if defined(MODE_LEDS)
-  setP25Int(m_modemState   == STATE_P25);
+  switch (m_modemState) {
-  setNXDNInt(m_modemState  == STATE_NXDN);
+    case STATE_DSTAR:  setDStarInt(false);  break;
+    case STATE_DMR:    setDMRInt(false);    break;
+    case STATE_YSF:    setYSFInt(false);    break;
+    case STATE_P25:    setP25Int(false);    break;
+    case STATE_NXDN:   setNXDNInt(false);   break;
+    case STATE_POCSAG: setPOCSAGInt(false); break;
+    case STATE_FM:     setFMInt(false);     break;
+  }
+
+  switch (state) {
+    case STATE_DSTAR:  setDStarInt(true);  break;
+    case STATE_DMR:    setDMRInt(true);    break;
+    case STATE_YSF:    setYSFInt(true);    break;
+    case STATE_P25:    setP25Int(true);    break;
+    case STATE_NXDN:   setNXDNInt(true);   break;
+    case STATE_POCSAG: setPOCSAGInt(true); break;
+    case STATE_FM:     setFMInt(true);     break;
+  }
 #endif
+
+  m_modemState = state;
 }
 
-void CIO::setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel, uint8_t nxdnTXLevel, int16_t txDCOffset, int16_t rxDCOffset)
+void CIO::setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel, uint8_t nxdnTXLevel, uint8_t pocsagTXLevel, uint8_t fmTXLevel, uint8_t ax25TXLevel, int16_t txDCOffset, int16_t rxDCOffset, bool useCOSAsLockout)
 {
   m_pttInvert = pttInvert;
 
-  m_rxLevel      = q15_t(rxLevel * 128);
+  m_rxLevel       = q15_t(rxLevel * 128);
-  m_cwIdTXLevel  = q15_t(cwIdTXLevel * 128);
+  m_cwIdTXLevel   = q15_t(cwIdTXLevel * 128);
-  m_dstarTXLevel = q15_t(dstarTXLevel * 128);
+  m_dstarTXLevel  = q15_t(dstarTXLevel * 128);
-  m_dmrTXLevel   = q15_t(dmrTXLevel * 128);
+  m_dmrTXLevel    = q15_t(dmrTXLevel * 128);
-  m_ysfTXLevel   = q15_t(ysfTXLevel * 128);
+  m_ysfTXLevel    = q15_t(ysfTXLevel * 128);
-  m_p25TXLevel   = q15_t(p25TXLevel * 128);
+  m_p25TXLevel    = q15_t(p25TXLevel * 128);
-  m_nxdnTXLevel  = q15_t(nxdnTXLevel * 128);
+  m_nxdnTXLevel   = q15_t(nxdnTXLevel * 128);
+  m_pocsagTXLevel = q15_t(pocsagTXLevel * 128);
+  m_fmTXLevel     = q15_t(fmTXLevel * 128);
+  m_ax25TXLevel   = q15_t(ax25TXLevel * 128);
 
   m_rxDCOffset   = DC_OFFSET + rxDCOffset;
   m_txDCOffset   = DC_OFFSET + txDCOffset;
+
+  m_useCOSAsLockout = useCOSAsLockout;
   
   if (rxInvert)
     m_rxLevel = -m_rxLevel;
   
   if (txInvert) {
-    m_dstarTXLevel = -m_dstarTXLevel;
+    m_dstarTXLevel  = -m_dstarTXLevel;
-    m_dmrTXLevel   = -m_dmrTXLevel;
+    m_dmrTXLevel    = -m_dmrTXLevel;
-    m_ysfTXLevel   = -m_ysfTXLevel;
+    m_ysfTXLevel    = -m_ysfTXLevel;
-    m_p25TXLevel   = -m_p25TXLevel;
+    m_p25TXLevel    = -m_p25TXLevel;
-    m_nxdnTXLevel  = -m_nxdnTXLevel;
+    m_nxdnTXLevel   = -m_nxdnTXLevel;
+    m_pocsagTXLevel = -m_pocsagTXLevel;
   }
 }
 
@@ -562,4 +643,3 @@ bool CIO::hasLockout() const
 {
   return m_lockout;
 }
-

IO.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -21,8 +21,12 @@
 
 #include "Globals.h"
 
-#include "SampleRB.h"
+#include "RingBuffer.h"
-#include "RSSIRB.h"
+
+struct TSample {
+  volatile uint16_t sample;
+  volatile uint8_t control;
+};
 
 class CIO {
 public:
@@ -38,11 +42,11 @@ public:
 
   void setDecode(bool dcd);
   void setADCDetection(bool detect);
-  void setMode();
+  void setMode(MMDVM_STATE state);
   
   void interrupt();
 
-  void setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel, uint8_t nxdnLevel, int16_t txDCOffset, int16_t rxDCOffset);
+  void setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel, uint8_t nxdnTXLevel, uint8_t pocsagTXLevel, uint8_t fmTXLevel, uint8_t ax25TXLevel, int16_t txDCOffset, int16_t rxDCOffset, bool useCOSAsLockout);
 
   void getOverflow(bool& adcOverflow, bool& dacOverflow);
 
@@ -57,27 +61,25 @@ public:
   void selfTest();
 
 private:
-  bool                 m_started;
+  bool                  m_started;
 
-  CSampleRB            m_rxBuffer;
+  CRingBuffer<TSample>  m_rxBuffer;
-  CSampleRB            m_txBuffer;
+  CRingBuffer<TSample>  m_txBuffer;
-  CRSSIRB              m_rssiBuffer;
+  CRingBuffer<uint16_t> m_rssiBuffer;
 
   arm_biquad_casd_df1_inst_q31 m_dcFilter;
   q31_t                        m_dcState[4];
 
-  arm_fir_instance_q15 m_dmrFilter;
+  arm_fir_instance_q15 m_rrcFilter;
   arm_fir_instance_q15 m_gaussianFilter;
   arm_fir_instance_q15 m_boxcarFilter;
   arm_fir_instance_q15 m_nxdnFilter;
   arm_fir_instance_q15 m_nxdnISincFilter;
-  arm_fir_instance_q15 m_ysfFilter;
+  q15_t                m_rrcState[70U];           // NoTaps + BlockSize - 1, 42 + 20 - 1 plus some spare
-  q15_t                m_dmrState[70U];           // NoTaps + BlockSize - 1, 42 + 20 - 1 plus some spare
   q15_t                m_gaussianState[40U];      // NoTaps + BlockSize - 1, 12 + 20 - 1 plus some spare
   q15_t                m_boxcarState[30U];        // NoTaps + BlockSize - 1, 6 + 20 - 1 plus some spare
   q15_t                m_nxdnState[110U];         // NoTaps + BlockSize - 1, 82 + 20 - 1 plus some spare
   q15_t                m_nxdnISincState[60U];     // NoTaps + BlockSize - 1, 32 + 20 - 1 plus some spare
-  q15_t                m_ysfState[70U];           // NoTaps + BlockSize - 1, 42 + 20 - 1 plus some spare
 
   bool                 m_pttInvert;
   q15_t                m_rxLevel;
@@ -87,10 +89,15 @@ private:
   q15_t                m_ysfTXLevel;
   q15_t                m_p25TXLevel;
   q15_t                m_nxdnTXLevel;
+  q15_t                m_pocsagTXLevel;
+  q15_t                m_fmTXLevel;
+  q15_t                m_ax25TXLevel;
 
   uint16_t             m_rxDCOffset;
   uint16_t             m_txDCOffset;
 
+  bool                 m_useCOSAsLockout;
+
   uint32_t             m_ledCount;
   bool                 m_ledValue;
 
@@ -118,9 +125,10 @@ private:
   void setYSFInt(bool on);
   void setP25Int(bool on);
   void setNXDNInt(bool on);
+  void setPOCSAGInt(bool on);
+  void setFMInt(bool on);
   
   void delayInt(unsigned int dly);
 };
 
 #endif
-

IODue.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2015 by Jim Mclaughlin KI6ZUM
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
@@ -34,6 +34,8 @@
 #define PIN_YSF                18
 #define PIN_P25                19
 #define PIN_NXDN               20
+#define PIN_POCSAG             4
+#define PIN_FM                 5
 #define ADC_CHER_Chan          (1<<7)                 // ADC on Due pin A0  - Due AD7 - (1 << 7)
 #define ADC_ISR_EOC_Chan       ADC_ISR_EOC7
 #define ADC_CDR_Chan           7
@@ -48,6 +50,8 @@
 #define PIN_YSF                7
 #define PIN_P25                6
 #define PIN_NXDN               5
+#define PIN_POCSAG             4
+#define PIN_FM                 3
 #define ADC_CHER_Chan          (1<<13)                // ADC on Due pin A11 - Due AD13 - (1 << 13)
 #define ADC_ISR_EOC_Chan       ADC_ISR_EOC13
 #define ADC_CDR_Chan           13
@@ -64,6 +68,8 @@
 #define PIN_YSF                7
 #define PIN_P25                6
 #define PIN_NXDN               5
+#define PIN_POCSAG             4
+#define PIN_FM                 3
 #define ADC_CHER_Chan          (1<<7)                 // ADC on Due pin A0  - Due AD7 - (1 << 7)
 #define ADC_ISR_EOC_Chan       ADC_ISR_EOC7
 #define ADC_CDR_Chan           7
@@ -92,14 +98,22 @@ void CIO::initInt()
   pinMode(PIN_LED,    OUTPUT);
   pinMode(PIN_COS,    INPUT);
 
-#if defined(ARDUINO_MODE_PINS)
+#if defined(MODE_LEDS)
   // Set up the mode output pins
   pinMode(PIN_DSTAR,  OUTPUT);
   pinMode(PIN_DMR,    OUTPUT);
   pinMode(PIN_YSF,    OUTPUT);
   pinMode(PIN_P25,    OUTPUT);
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
   pinMode(PIN_NXDN,   OUTPUT);
 #endif
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  pinMode(PIN_POCSAG, OUTPUT);
+#endif
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  pinMode(PIN_FM,     OUTPUT);
+#endif
+#endif
 }
 
 void CIO::startInt()
@@ -171,14 +185,13 @@ void CIO::startInt()
 void CIO::interrupt()
 {
   if ((ADC->ADC_ISR & ADC_ISR_EOC_Chan) == ADC_ISR_EOC_Chan) {    // Ensure there was an End-of-Conversion and we read the ISR reg
-    uint8_t control = MARK_NONE;
+    TSample sample = {DC_OFFSET, MARK_NONE};
-    uint16_t sample = DC_OFFSET;
 
-    m_txBuffer.get(sample, control);
+    m_txBuffer.get(sample);
-    DACC->DACC_CDR = sample;
+    DACC->DACC_CDR = sample.sample;
 
-    sample = ADC->ADC_CDR[ADC_CDR_Chan];
+    sample.sample = ADC->ADC_CDR[ADC_CDR_Chan];
-    m_rxBuffer.put(sample, control);
+    m_rxBuffer.put(sample);
 
 #if defined(SEND_RSSI_DATA)
     m_rssiBuffer.put(ADC->ADC_CDR[RSSI_CDR_Chan]);
@@ -232,7 +245,32 @@ void CIO::setP25Int(bool on)
 
 void CIO::setNXDNInt(bool on)
 {
+#if defined(USE_ALTERNATE_NXDN_LEDS)
+  digitalWrite(PIN_YSF, on ? HIGH : LOW);
+  digitalWrite(PIN_P25, on ? HIGH : LOW);
+#else
   digitalWrite(PIN_NXDN, on ? HIGH : LOW);
+#endif
+}
+
+void CIO::setPOCSAGInt(bool on)
+{
+#if defined(USE_ALTERNATE_POCSAG_LEDS)
+  digitalWrite(PIN_DSTAR, on ? HIGH : LOW);
+  digitalWrite(PIN_DMR,   on ? HIGH : LOW);
+#else
+  digitalWrite(PIN_POCSAG, on ? HIGH : LOW);
+#endif
+}
+
+void CIO::setFMInt(bool on)
+{
+#if defined(USE_ALTERNATE_FM_LEDS)
+  digitalWrite(PIN_DSTAR, on ? HIGH : LOW);
+  digitalWrite(PIN_YSF,   on ? HIGH : LOW);
+#else
+  digitalWrite(PIN_FM, on ? HIGH : LOW);
+#endif
 }
 
 void CIO::delayInt(unsigned int dly)
@@ -241,4 +279,3 @@ void CIO::delayInt(unsigned int dly)
 }
 
 #endif
-

IOPins.h

@@ -0,0 +1,73 @@
+/*
+ *   Copyright (C) 2019,2020 by BG5HHP
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _IO_PINS_H
+#define _IO_PINS_H
+
+#if !defined(CONFIG_H)
+#error "Requires Config.h to be included first!"
+#endif
+
+#if defined(STM32F4_RPT_HAT_TGO)
+    #include "pins/pins_f4_rpt_tgo.h"
+
+#elif defined(STM32F4_DISCOVERY)
+    #include "pins/pins_f4_discovery.h"
+
+#elif defined(STM32F4_PI)
+    #include "pins/pins_f4_pi.h"
+
+#elif defined(STM32F722_PI)
+    #include "pins/pins_f7_pi.h"
+
+#elif defined(STM32F4_F4M)
+    #include "pins/pins_f4_f4m.h"
+
+#elif defined(STM32F722_F7M)
+    #include "pins/pins_f7_f7m.h"
+
+#elif defined(STM32F722_RPT_HAT)
+    #include "pins/pins_f7_rpt_hat.h"
+
+#elif defined(STM32F4_NUCLEO)
+    #if defined(STM32F4_NUCLEO_MORPHO_HEADER)
+        #include "pins/pins_f4_nucleo_morpho.h"
+    #elif defined(STM32F4_NUCLEO_ARDUINO_HEADER)
+        #include "pins/pins_f4_nucleo_arduino.h"
+    #else
+        #error "Either STM32F4_NUCLEO_MORPHO_HEADER or STM32F4_NUCLEO_ARDUINO_HEADER need to be defined"
+    #endif
+
+#elif defined(STM32F7_NUCLEO)
+    #include "pins/pins_f7_nucleo.h"
+
+#elif defined(STM32F4_DVM)
+    #include "pins/pins_f4_stm32dvm_v3.h"
+
+#elif defined(DRCC_DVM_NQF)
+    #include "pins/pins_f4_drcc_nqf.h"
+
+#elif defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
+    #include "pins/pins_f4_stm32eda.h"
+
+#else
+    #error "A valid board type macro need to be defined."
+
+#endif
+
+#endif  //#ifndef _IO_PINS_H

IOSTM.cpp

@@ -1,7 +1,8 @@
 /*
  *   Copyright (C) 2016 by Jim McLaughlin KI6ZUM
  *   Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
- *   Copyright (C) 2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2017,2018,2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2019,2020 by BG5HHP
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -23,597 +24,8 @@
 #include "IO.h"
 
 #if defined(STM32F4XX) || defined(STM32F7XX)
+#include "IOPins.h"
 
-#if defined(STM32F4_DISCOVERY)
-/*
-Pin definitions for STM32F4 Discovery Board:
-
-PTT      PB13   output           P1 Pin37
-COSLED   PA7    output           P1 Pin17
-LED      PD15   output           P1 Pin47
-COS      PA5    input            P1 Pin15
-
-DSTAR    PD12   output           P1 Pin44
-DMR      PD13   output           P1 Pin45
-YSF      PD14   output           P1 Pin46
-P25      PD11   output           P1 Pin43
-NXDN     PD10   output           P1 Pin42
-
-RX       PA0    analog input     P1 Pin12
-RSSI     PA1    analog input     P1 Pin11
-TX       PA4    analog output    P1 Pin16
-
-EXT_CLK  PA15   input            P2 Pin40
-*/
-
-#define PIN_COS           GPIO_Pin_5
-#define PORT_COS          GPIOA
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOA
-
-#define PIN_PTT           GPIO_Pin_13
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_7
-#define PORT_COSLED       GPIOA
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOA
-
-#define PIN_LED           GPIO_Pin_15
-#define PORT_LED          GPIOD
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOD
-
-#define PIN_P25           GPIO_Pin_11
-#define PORT_P25          GPIOD
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOD
-
-#define PIN_NXDN          GPIO_Pin_10
-#define PORT_NXDN         GPIOD
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOD
-
-#define PIN_DSTAR         GPIO_Pin_12
-#define PORT_DSTAR        GPIOD
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOD
-
-#define PIN_DMR           GPIO_Pin_13
-#define PORT_DMR          GPIOD
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOD
-
-#define PIN_YSF           GPIO_Pin_14
-#define PORT_YSF          GPIOD
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOD
-
-#define PIN_EXT_CLK       GPIO_Pin_15
-#define SRC_EXT_CLK       GPIO_PinSource15
-#define PORT_EXT_CLK      GPIOA
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_1
-#define PIN_RSSI_CH       ADC_Channel_1
-#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
-
-#define PIN_TX            GPIO_Pin_4
-#define PIN_TX_CH         DAC_Channel_1
-
-#elif defined(STM32F4_PI)
-/*
-Pin definitions for STM32F4 Pi Board:
-
-PTT      PB13   output
-COSLED   PB14   output
-LED      PB15   output
-COS      PC0    input
-
-DSTAR    PC7    output
-DMR      PC8    output
-YSF      PA8    output
-P25      PC9    output
-NXDN     PB1    output
-
-RX       PA0    analog input
-RSSI     PA7    analog input
-TX       PA4    analog output
-
-EXT_CLK  PA15   input
-*/
-
-#define PIN_COS           GPIO_Pin_0
-#define PORT_COS          GPIOC
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOC
-
-#define PIN_PTT           GPIO_Pin_13
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_14
-#define PORT_COSLED       GPIOB
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
-
-#define PIN_LED           GPIO_Pin_15
-#define PORT_LED          GPIOB
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOB
-
-#define PIN_P25           GPIO_Pin_9
-#define PORT_P25          GPIOC
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOC
-
-#define PIN_NXDN          GPIO_Pin_1
-#define PORT_NXDN         GPIOB
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOB
-
-#define PIN_DSTAR         GPIO_Pin_7
-#define PORT_DSTAR        GPIOC
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOC
-
-#define PIN_DMR           GPIO_Pin_8
-#define PORT_DMR          GPIOC
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOC
-
-#define PIN_YSF           GPIO_Pin_8
-#define PORT_YSF          GPIOA
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOA
-
-#define PIN_EXT_CLK       GPIO_Pin_15
-#define SRC_EXT_CLK       GPIO_PinSource15
-#define PORT_EXT_CLK      GPIOA
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_7
-#define PIN_RSSI_CH       ADC_Channel_7
-#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
-
-#define PIN_TX            GPIO_Pin_4
-#define PIN_TX_CH         DAC_Channel_1
-
-#elif defined(STM32F722_PI)
-/*
-Pin definitions for STM32F722 Pi Board:
-
-PTT      PB13   output
-COSLED   PB14   output
-LED      PB15   output
-COS      PC0    input
-
-DSTAR    PC7    output
-DMR      PC8    output
-YSF      PA8    output
-P25      PC9    output
-NXDN     PB1    output
-
-RX       PA0    analog input
-RSSI     PA7    analog input
-TX       PA4    analog output
-
-EXT_CLK  PA15   input
-*/
-
-#define PIN_COS           GPIO_Pin_0
-#define PORT_COS          GPIOC
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOC
-
-#define PIN_PTT           GPIO_Pin_13
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_14
-#define PORT_COSLED       GPIOB
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
-
-#define PIN_LED           GPIO_Pin_15
-#define PORT_LED          GPIOB
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOB
-
-#define PIN_P25           GPIO_Pin_9
-#define PORT_P25          GPIOC
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOC
-
-#define PIN_NXDN          GPIO_Pin_1
-#define PORT_NXDN         GPIOB
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOB
-
-#define PIN_DSTAR         GPIO_Pin_7
-#define PORT_DSTAR        GPIOC
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOC
-
-#define PIN_DMR           GPIO_Pin_8
-#define PORT_DMR          GPIOC
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOC
-
-#define PIN_YSF           GPIO_Pin_8
-#define PORT_YSF          GPIOA
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOA
-
-#define PIN_EXT_CLK       GPIO_Pin_15
-#define SRC_EXT_CLK       GPIO_PinSource15
-#define PORT_EXT_CLK      GPIOA
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_7
-#define PIN_RSSI_CH       ADC_Channel_7
-#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
-
-#define PIN_TX            GPIO_Pin_4
-#define PIN_TX_CH         DAC_Channel_1
-
-#elif defined(STM32F4_F4M)
-/*
-Pin definitions for MMDVM-F4M Pi-Hat F0DEI board:
-
-PTT      PB13   output
-COSLED   PB14   output
-LED      PB15   output
-COS      PC0    input
-
-DSTAR    PC7    output
-DMR      PC8    output
-YSF      PA8    output
-P25      PC9    output
-NXDN     PB1    output
-
-RX       PA0    analog input
-RSSI     PA7    analog input
-TX       PA4    analog output
-
-EXT_CLK  PA15   input
-*/
-
-#define PIN_COS           GPIO_Pin_0
-#define PORT_COS          GPIOC
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOC
-
-#define PIN_PTT           GPIO_Pin_13
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_14
-#define PORT_COSLED       GPIOB
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
-
-#define PIN_LED           GPIO_Pin_15
-#define PORT_LED          GPIOB
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOB
-
-#define PIN_P25           GPIO_Pin_9
-#define PORT_P25          GPIOC
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOC
-
-#define PIN_NXDN          GPIO_Pin_1
-#define PORT_NXDN         GPIOB
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOB
-
-#define PIN_DSTAR         GPIO_Pin_7
-#define PORT_DSTAR        GPIOC
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOC
-
-#define PIN_DMR           GPIO_Pin_8
-#define PORT_DMR          GPIOC
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOC
-
-#define PIN_YSF           GPIO_Pin_8
-#define PORT_YSF          GPIOA
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOA
-
-#define PIN_EXT_CLK       GPIO_Pin_15
-#define SRC_EXT_CLK       GPIO_PinSource15
-#define PORT_EXT_CLK      GPIOA
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_7
-#define PIN_RSSI_CH       ADC_Channel_7
-#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
-
-#define PIN_TX            GPIO_Pin_4
-#define PIN_TX_CH         DAC_Channel_1
-
-#elif defined(STM32F4_NUCLEO)
-
-#if defined(STM32F4_NUCLEO_MORPHO_HEADER)
-/*
-Pin definitions for STM32F4 Nucleo boards (ST Morpho header):
-
-PTT      PB13   output           CN10 Pin30
-COSLED   PB14   output           CN10 Pin28
-LED      PA5    output           CN10 Pin11
-COS      PB15   input            CN10 Pin26
-
-DSTAR    PB10   output           CN10 Pin25
-DMR      PB4    output           CN10 Pin27
-YSF      PB5    output           CN10 Pin29
-P25      PB3    output           CN10 Pin31
-NXDN     PA10   output           CN10 Pin33
-
-MDSTAR   PC4    output           CN10 Pin34
-MDMR     PC5    output           CN10 Pin6
-MYSF     PC2    output           CN7 Pin35
-MP25     PC3    output           CN7 Pin37
-MNXDN    PC6    output           CN10 Pin4
-
-RX       PA0    analog input     CN7 Pin28
-RSSI     PA1    analog input     CN7 Pin30
-TX       PA4    analog output    CN7 Pin32
-
-EXT_CLK  PA15   input            CN7 Pin17
-*/
-
-#define PIN_COS           GPIO_Pin_15
-#define PORT_COS          GPIOB
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOB
-
-#define PIN_PTT           GPIO_Pin_13
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_14
-#define PORT_COSLED       GPIOB
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
-
-#define PIN_LED           GPIO_Pin_5
-#define PORT_LED          GPIOA
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOA
-
-#define PIN_P25           GPIO_Pin_3
-#define PORT_P25          GPIOB
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOB
-
-#define PIN_NXDN          GPIO_Pin_10
-#define PORT_NXDN         GPIOA
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOA
-
-#define PIN_DSTAR         GPIO_Pin_10
-#define PORT_DSTAR        GPIOB
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOB
-
-#define PIN_DMR           GPIO_Pin_4
-#define PORT_DMR          GPIOB
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOB
-
-#define PIN_YSF           GPIO_Pin_5
-#define PORT_YSF          GPIOB
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOB
-
-#if defined(STM32F4_NUCLEO_MODE_PINS)
-#define PIN_MP25          GPIO_Pin_3
-#define PORT_MP25         GPIOC
-#define RCC_Per_MP25      RCC_AHB1Periph_GPIOC
-
-#define PIN_MNXDN         GPIO_Pin_6
-#define PORT_MNXDN        GPIOC
-#define RCC_Per_MNXDN     RCC_AHB1Periph_GPIOC
-
-#define PIN_MDSTAR        GPIO_Pin_4
-#define PORT_MDSTAR       GPIOC
-#define RCC_Per_MDSTAR    RCC_AHB1Periph_GPIOC
-
-#define PIN_MDMR          GPIO_Pin_5
-#define PORT_MDMR         GPIOC
-#define RCC_Per_MDMR      RCC_AHB1Periph_GPIOC
-
-#define PIN_MYSF          GPIO_Pin_2
-#define PORT_MYSF         GPIOC
-#define RCC_Per_MYSF      RCC_AHB1Periph_GPIOC
-#endif
-
-#define PIN_EXT_CLK       GPIO_Pin_15
-#define SRC_EXT_CLK       GPIO_PinSource15
-#define PORT_EXT_CLK      GPIOA
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_1
-#define PIN_RSSI_CH       ADC_Channel_1
-#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
-
-#define PIN_TX            GPIO_Pin_4
-#define PIN_TX_CH         DAC_Channel_1
-
-#elif defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-/*
-Pin definitions for STM32F4 Nucleo boards (Arduino header):
-
-PTT      PB10   output           CN9 Pin7
-COSLED   PB3    output           CN9 Pin4
-LED      PB5    output           CN9 Pin5
-COS      PB4    input            CN9 Pin6
-
-DSTAR    PA1    output           CN8 Pin2
-DMR      PA4    output           CN8 Pin3
-YSF      PB0    output           CN8 Pin4
-P25      PC1    output           CN8 Pin5
-NXDN     PC0    output           CN8 Pin6
-
-RX       PA0    analog input     CN8 Pin1
-RSSI     PC0    analog input     CN8 Pin6
-TX       PA5    analog output    CN5 Pin6
-
-EXT_CLK  PB8    input            CN5 Pin10
-*/
-
-#define PIN_COS           GPIO_Pin_4
-#define PORT_COS          GPIOB
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOB
-
-#define PIN_PTT           GPIO_Pin_10
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_3
-#define PORT_COSLED       GPIOB
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
-
-#define PIN_LED           GPIO_Pin_5
-#define PORT_LED          GPIOB
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOB
-
-#define PIN_P25           GPIO_Pin_1
-#define PORT_P25          GPIOC
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOC
-
-#define PIN_NXDN          GPIO_Pin_0
-#define PORT_NXDN         GPIOC
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOC
-
-#define PIN_DSTAR         GPIO_Pin_1
-#define PORT_DSTAR        GPIOA
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOA
-
-#define PIN_DMR           GPIO_Pin_4
-#define PORT_DMR          GPIOA
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOA
-
-#define PIN_YSF           GPIO_Pin_0
-#define PORT_YSF          GPIOB
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOB
-
-#define PIN_EXT_CLK       GPIO_Pin_8
-#define SRC_EXT_CLK       GPIO_PinSource8
-#define PORT_EXT_CLK      GPIOB
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_0
-#define PIN_RSSI_CH       ADC_Channel_10
-#define PORT_RSSI         GPIOC
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOC
-
-#define PIN_TX            GPIO_Pin_5
-#define PIN_TX_CH         DAC_Channel_2
-
-#else
-#error "Either STM32F4_NUCLEO_MORPHO_HEADER or STM32F4_NUCLEO_ARDUINO_HEADER need to be defined in Config.h"
-#endif
-
-#elif defined(STM32F7_NUCLEO)
-/*
-Pin definitions for STM32F7 Nucleo boards (ST Morpho header):
-
-PTT      PB13   output           CN12 Pin30
-COSLED   PB14   output           CN12 Pin28
-LED      PA5    output           CN12 Pin11
-COS      PB15   input            CN12 Pin26
-
-DSTAR    PB10   output           CN12 Pin25
-DMR      PB4    output           CN12 Pin27
-YSF      PB5    output           CN12 Pin29
-P25      PB3    output           CN12 Pin31
-NXDN     PA10   output           CN12 Pin33
-
-MDSTAR   PC4    output           CN12 Pin34
-MDMR     PC5    output           CN12 Pin6
-MYSF     PC2    output           CN11 Pin35
-MP25     PC3    output           CN11 Pin37
-MNXDN    PC6    output           CN12 Pin4
-
-RX       PA0    analog input     CN11 Pin28
-RSSI     PA1    analog input     CN11 Pin30
-TX       PA4    analog output    CN11 Pin32
-
-EXT_CLK  PA15   input            CN11 Pin17
-*/
-
-#define PIN_COS           GPIO_Pin_15
-#define PORT_COS          GPIOB
-#define RCC_Per_COS       RCC_AHB1Periph_GPIOB
-
-#define PIN_PTT           GPIO_Pin_13
-#define PORT_PTT          GPIOB
-#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
-
-#define PIN_COSLED        GPIO_Pin_14
-#define PORT_COSLED       GPIOB
-#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
-
-#define PIN_LED           GPIO_Pin_5
-#define PORT_LED          GPIOA
-#define RCC_Per_LED       RCC_AHB1Periph_GPIOA
-
-#define PIN_P25           GPIO_Pin_3
-#define PORT_P25          GPIOB
-#define RCC_Per_P25       RCC_AHB1Periph_GPIOB
-
-#define PIN_NXDN          GPIO_Pin_10
-#define PORT_NXDN         GPIOA
-#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOA
-
-#define PIN_DSTAR         GPIO_Pin_10
-#define PORT_DSTAR        GPIOB
-#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOB
-
-#define PIN_DMR           GPIO_Pin_4
-#define PORT_DMR          GPIOB
-#define RCC_Per_DMR       RCC_AHB1Periph_GPIOB
-
-#define PIN_YSF           GPIO_Pin_5
-#define PORT_YSF          GPIOB
-#define RCC_Per_YSF       RCC_AHB1Periph_GPIOB
-
-#if defined(STM32F4_NUCLEO_MODE_PINS)
-#define PIN_MP25          GPIO_Pin_3
-#define PORT_MP25         GPIOC
-#define RCC_Per_MP25      RCC_AHB1Periph_GPIOC
-
-#define PIN_MNXDN         GPIO_Pin_6
-#define PORT_MNXDN        GPIOC
-#define RCC_Per_MNXDN     RCC_AHB1Periph_GPIOC
-
-#define PIN_MDSTAR        GPIO_Pin_4
-#define PORT_MDSTAR       GPIOC
-#define RCC_Per_MDSTAR    RCC_AHB1Periph_GPIOC
-
-#define PIN_MDMR          GPIO_Pin_5
-#define PORT_MDMR         GPIOC
-#define RCC_Per_MDMR      RCC_AHB1Periph_GPIOC
-
-#define PIN_MYSF          GPIO_Pin_2
-#define PORT_MYSF         GPIOC
-#define RCC_Per_MYSF      RCC_AHB1Periph_GPIOC
-#endif
-
-#define PIN_EXT_CLK       GPIO_Pin_15
-#define SRC_EXT_CLK       GPIO_PinSource15
-#define PORT_EXT_CLK      GPIOA
-
-#define PIN_RX            GPIO_Pin_0
-#define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
-
-#define PIN_RSSI          GPIO_Pin_1
-#define PIN_RSSI_CH       ADC_Channel_1
-#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
-
-#define PIN_TX            GPIO_Pin_4
-#define PIN_TX_CH         DAC_Channel_1
-
-#else
-#error "Either STM32F4_DISCOVERY, STM32F4_PI, STM32F722_PI, STM32F4_F4M, STM32F4_NUCLEO or STM32F7_NUCLEO need to be defined"
-#endif
 
 const uint16_t DC_OFFSET = 2048U;
 
@@ -661,7 +73,7 @@ void CIO::initInt()
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IN;
    GPIO_Init(PORT_COS, &GPIO_InitStruct);
 
-#if defined(ARDUINO_MODE_PINS)
+#if defined(MODE_LEDS)
    // DSTAR pin
    RCC_AHB1PeriphClockCmd(RCC_Per_DSTAR, ENABLE);
    GPIO_InitStruct.GPIO_Pin   = PIN_DSTAR;
@@ -686,6 +98,7 @@ void CIO::initInt()
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
    GPIO_Init(PORT_P25, &GPIO_InitStruct);
 
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
    // NXDN pin
    RCC_AHB1PeriphClockCmd(RCC_Per_NXDN, ENABLE);
    GPIO_InitStruct.GPIO_Pin   = PIN_NXDN;
@@ -693,7 +106,25 @@ void CIO::initInt()
    GPIO_Init(PORT_NXDN, &GPIO_InitStruct);
 #endif
 
-#if defined(STM32F4_NUCLEO_MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && defined(STM32F4_NUCLEO)
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+   // POCSAG pin
+   RCC_AHB1PeriphClockCmd(RCC_Per_POCSAG, ENABLE);
+   GPIO_InitStruct.GPIO_Pin   = PIN_POCSAG;
+   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
+   GPIO_Init(PORT_POCSAG, &GPIO_InitStruct);
+#endif
+
+#if !defined(USE_ALTERNATE_FM_LEDS)
+   // FM pin
+   RCC_AHB1PeriphClockCmd(RCC_Per_FM, ENABLE);
+   GPIO_InitStruct.GPIO_Pin   = PIN_FM;
+   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
+   GPIO_Init(PORT_FM, &GPIO_InitStruct);
+#endif
+
+#endif
+
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
    // DSTAR mode pin
    RCC_AHB1PeriphClockCmd(RCC_Per_MDSTAR, ENABLE);
    GPIO_InitStruct.GPIO_Pin   = PIN_MDSTAR;
@@ -718,12 +149,31 @@ void CIO::initInt()
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
    GPIO_Init(PORT_MP25, &GPIO_InitStruct);
 
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
    // NXDN mode pin
    RCC_AHB1PeriphClockCmd(RCC_Per_MNXDN, ENABLE);
    GPIO_InitStruct.GPIO_Pin   = PIN_MNXDN;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
    GPIO_Init(PORT_MNXDN, &GPIO_InitStruct);
 #endif
+
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+   // POCSAG mode pin
+   RCC_AHB1PeriphClockCmd(RCC_Per_MPOCSAG, ENABLE);
+   GPIO_InitStruct.GPIO_Pin   = PIN_MPOCSAG;
+   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
+   GPIO_Init(PORT_MPOCSAG, &GPIO_InitStruct);
+#endif
+
+#if !defined(USE_ALTERNATE_FM_LEDS)
+   // FM mode pin
+   RCC_AHB1PeriphClockCmd(RCC_Per_MFM, ENABLE);
+   GPIO_InitStruct.GPIO_Pin   = PIN_MFM;
+   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
+   GPIO_Init(PORT_MFM, &GPIO_InitStruct);
+#endif
+
+#endif
 }
 
 void CIO::startInt()
@@ -876,25 +326,24 @@ void CIO::startInt()
 
 void CIO::interrupt()
 {
-   uint8_t control  = MARK_NONE;
+   TSample sample = {DC_OFFSET, MARK_NONE};
-   uint16_t sample  = DC_OFFSET;
    uint16_t rawRSSI = 0U;
 
-   m_txBuffer.get(sample, control);
+   m_txBuffer.get(sample);
 
    // Send the value to the DAC
 #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-   DAC_SetChannel2Data(DAC_Align_12b_R, sample);
+   DAC_SetChannel2Data(DAC_Align_12b_R, sample.sample);
 #else
-   DAC_SetChannel1Data(DAC_Align_12b_R, sample);
+   DAC_SetChannel1Data(DAC_Align_12b_R, sample.sample);
 #endif
 
    // Read value from ADC1 and ADC2
    if ((ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET)) {
       // shouldn't be still in reset at this point so null the sample value?
-      sample  = 0U;
+      sample.sample  = 0U;
    } else {
-      sample  = ADC_GetConversionValue(ADC1);
+      sample.sample  = ADC_GetConversionValue(ADC1);
 #if defined(SEND_RSSI_DATA)
       rawRSSI = ADC_GetConversionValue(ADC2);
 #endif
@@ -904,7 +353,7 @@ void CIO::interrupt()
    ADC_ClearFlag(ADC1, ADC_FLAG_EOC);
    ADC_SoftwareStartConv(ADC1);
 
-   m_rxBuffer.put(sample, control);
+   m_rxBuffer.put(sample);
    m_rssiBuffer.put(rawRSSI);
 
    m_watchdog++;
@@ -932,42 +381,105 @@ void CIO::setCOSInt(bool on)
 
 void CIO::setDStarInt(bool on)
 {
+#if defined(MODE_LEDS)
    GPIO_WriteBit(PORT_DSTAR, PIN_DSTAR, on ? Bit_SET : Bit_RESET);
-#if defined(STM32F4_NUCLEO_MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && defined(STM32F4_NUCLEO)
+#endif
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
    GPIO_WriteBit(PORT_MDSTAR, PIN_MDSTAR, on ? Bit_SET : Bit_RESET);
 #endif
 }
 
 void CIO::setDMRInt(bool on)
 {
+#if defined(MODE_LEDS)
    GPIO_WriteBit(PORT_DMR, PIN_DMR, on ? Bit_SET : Bit_RESET);
-#if defined(STM32F4_NUCLEO_MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && defined(STM32F4_NUCLEO)
+#endif
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
    GPIO_WriteBit(PORT_MDMR, PIN_MDMR, on ? Bit_SET : Bit_RESET);
 #endif
 }
 
 void CIO::setYSFInt(bool on)
 {
+#if defined(MODE_LEDS)
    GPIO_WriteBit(PORT_YSF, PIN_YSF, on ? Bit_SET : Bit_RESET);
-#if defined(STM32F4_NUCLEO_MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && defined(STM32F4_NUCLEO)
+#endif
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
    GPIO_WriteBit(PORT_MYSF, PIN_MYSF, on ? Bit_SET : Bit_RESET);
 #endif
 }
 
 void CIO::setP25Int(bool on)
 {
+#if defined(MODE_LEDS)
    GPIO_WriteBit(PORT_P25, PIN_P25, on ? Bit_SET : Bit_RESET);
-#if defined(STM32F4_NUCLEO_MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && defined(STM32F4_NUCLEO)
+#endif
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
    GPIO_WriteBit(PORT_MP25, PIN_MP25, on ? Bit_SET : Bit_RESET);
 #endif
 }
 
 void CIO::setNXDNInt(bool on)
 {
+#if defined(MODE_LEDS)
+#if defined(USE_ALTERNATE_NXDN_LEDS)
+   GPIO_WriteBit(PORT_YSF, PIN_YSF, on ? Bit_SET : Bit_RESET);
+   GPIO_WriteBit(PORT_P25, PIN_P25, on ? Bit_SET : Bit_RESET);
+#else
    GPIO_WriteBit(PORT_NXDN, PIN_NXDN, on ? Bit_SET : Bit_RESET);
-#if defined(STM32F4_NUCLEO_MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && defined(STM32F4_NUCLEO)
+#endif
+#endif
+
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
+#if defined(USE_ALTERNATE_NXDN_LEDS)
+   GPIO_WriteBit(PORT_MYSF, PIN_MYSF, on ? Bit_SET : Bit_RESET);
+   GPIO_WriteBit(PORT_MP25, PIN_MP25, on ? Bit_SET : Bit_RESET);
+#else
    GPIO_WriteBit(PORT_MNXDN, PIN_MNXDN, on ? Bit_SET : Bit_RESET);
 #endif
+#endif
+}
+
+void CIO::setPOCSAGInt(bool on)
+{
+#if defined(MODE_LEDS)
+#if defined(USE_ALTERNATE_POCSAG_LEDS)
+   GPIO_WriteBit(PORT_DSTAR, PIN_DSTAR, on ? Bit_SET : Bit_RESET);
+   GPIO_WriteBit(PORT_DMR,   PIN_DMR,   on ? Bit_SET : Bit_RESET);
+#else
+   GPIO_WriteBit(PORT_POCSAG,  PIN_POCSAG, on ? Bit_SET : Bit_RESET);
+#endif
+#endif
+
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
+#if defined(USE_ALTERNATE_POCSAG_LEDS)
+   GPIO_WriteBit(PORT_MDSTAR, PIN_MDSTAR, on ? Bit_SET : Bit_RESET);
+   GPIO_WriteBit(PORT_MDMR,   PIN_MDMR,   on ? Bit_SET : Bit_RESET);
+#else
+   GPIO_WriteBit(PORT_MPOCSAG, PIN_MPOCSAG, on ? Bit_SET : Bit_RESET);
+#endif
+#endif
+}
+
+void CIO::setFMInt(bool on)
+{
+#if defined(MODE_LEDS)
+#if defined(USE_ALTERNATE_FM_LEDS)
+   GPIO_WriteBit(PORT_DSTAR, PIN_DSTAR, on ? Bit_SET : Bit_RESET);
+   GPIO_WriteBit(PORT_YSF,   PIN_YSF,   on ? Bit_SET : Bit_RESET);
+#else
+   GPIO_WriteBit(PORT_FM,  PIN_FM, on ? Bit_SET : Bit_RESET);
+#endif
+#endif
+
+#if defined(MODE_PINS) && defined(STM32F4_NUCLEO_MORPHO_HEADER) && (defined(STM32F4_NUCLEO) || defined(STM32F722_RPT_HAT))
+#if defined(USE_ALTERNATE_FM_LEDS)
+   GPIO_WriteBit(PORT_MDSTAR, PIN_MDSTAR, on ? Bit_SET : Bit_RESET);
+   GPIO_WriteBit(PORT_MYSF,   PIN_MYSF,   on ? Bit_SET : Bit_RESET);
+#else
+   GPIO_WriteBit(PORT_MFM, PIN_MFM, on ? Bit_SET : Bit_RESET);
+#endif
+#endif
 }
 
 // Simple delay function for STM32

IOSTM_CMSIS.cpp

@@ -1,7 +1,7 @@
 /*
  *   Copyright (C) 2016 by Jim McLaughlin KI6ZUM
  *   Copyright (C) 2016, 2017 by Andy Uribe CA6JAU
- *   Copyright (C) 2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2017,2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2017 by Wojciech Krutnik N0CALL
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -40,6 +40,7 @@ DMR      PB6    output
 YSF      PB8    output
 P25      PB9    output
 NXDN     PB10   output
+POCSAG   PB11   output
 
 RX       PB0    analog input (ADC1_8)
 RSSI     PB1    analog input (ADC2_9)
@@ -80,6 +81,9 @@ USART1_RXD PA10  input (AF)
 #define PIN_NXDN          10
 #define PORT_NXDN         GPIOB
 #define BB_NXDN           *((bitband_t)BITBAND_PERIPH(&PORT_NXDN->ODR, PIN_NXDN))
+#define PIN_POCSAG        11
+#define PORT_POCSAG       GPIOB
+#define BB_POCSAG         *((bitband_t)BITBAND_PERIPH(&PORT_POCSAG->ODR, PIN_POCSAG))
 
 #define PIN_RX            0
 #define PIN_RX_ADC_CH     8
@@ -209,17 +213,22 @@ static inline void GPIOInit()
 	GPIOD->ODR = 0;
   
   // configure ports
-  GPIOConfigPin(PORT_PTT, PIN_PTT, GPIO_CRL_MODE0_1);
+  GPIOConfigPin(PORT_PTT,    PIN_PTT,    GPIO_CRL_MODE0_1);
   GPIOConfigPin(PORT_COSLED, PIN_COSLED, GPIO_CRL_MODE0_1);
-  GPIOConfigPin(PORT_LED, PIN_LED, GPIO_CRL_MODE0_1);
+  GPIOConfigPin(PORT_LED,    PIN_LED,    GPIO_CRL_MODE0_1);
-  GPIOConfigPin(PORT_COS, PIN_COS, GPIO_CRL_CNF0_1);
+  GPIOConfigPin(PORT_COS,    PIN_COS,    GPIO_CRL_CNF0_1);
-  
-  GPIOConfigPin(PORT_DSTAR, PIN_DSTAR, GPIO_CRL_MODE0_1);
-  GPIOConfigPin(PORT_DMR, PIN_DMR, GPIO_CRL_MODE0_1);
-  GPIOConfigPin(PORT_YSF, PIN_YSF, GPIO_CRL_MODE0_1);
-  GPIOConfigPin(PORT_P25, PIN_P25, GPIO_CRL_MODE0_1);
-  GPIOConfigPin(PORT_NXDN, PIN_NXDN, GPIO_CRL_MODE0_1);
   
+  GPIOConfigPin(PORT_DSTAR,  PIN_DSTAR,  GPIO_CRL_MODE0_1);
+  GPIOConfigPin(PORT_DMR,    PIN_DMR,    GPIO_CRL_MODE0_1);
+  GPIOConfigPin(PORT_YSF,    PIN_YSF,    GPIO_CRL_MODE0_1);
+  GPIOConfigPin(PORT_P25,    PIN_P25,    GPIO_CRL_MODE0_1);
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
+  GPIOConfigPin(PORT_NXDN,   PIN_NXDN,   GPIO_CRL_MODE0_1);
+#endif
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  GPIOConfigPin(PORT_POCSAG, PIN_POCSAG, GPIO_CRL_MODE0_1);
+#endif
+
   GPIOConfigPin(PORT_RX, PIN_RX, 0);
 #if defined(SEND_RSSI_DATA)
   GPIOConfigPin(PORT_RSSI, PIN_RSSI, 0);
@@ -358,9 +367,10 @@ void CIO::startInt()
 
 void CIO::interrupt()
 {
-  uint8_t control  = MARK_NONE;
+  TSample sample = {DC_OFFSET, MARK_NONE};
-  uint16_t sample  = DC_OFFSET;
+#if defined(SEND_RSSI_DATA)
   uint16_t rawRSSI = 0U;
+#endif
   bitband_t eoc = (bitband_t)BITBAND_PERIPH(&ADC1->SR, ADC_SR_EOS_Pos);
   bitband_t adon = (bitband_t)BITBAND_PERIPH(&ADC1->CR2, ADC_CR2_ADON_Pos);
 #if defined(SEND_RSSI_DATA)
@@ -374,12 +384,12 @@ void CIO::interrupt()
     *rssi_adon = 1;
 #endif
     
-    m_txBuffer.get(sample, control);
+    m_txBuffer.get(sample);
-    DAC->DHR12R1 = sample;  // Send the value to the DAC
+    DAC->DHR12R1 = sample.sample;  // Send the value to the DAC
 
     // Read value from ADC1 and ADC2
-    sample  = ADC1->DR;   // read conversion result; EOC is cleared by this read
+    sample.sample  = ADC1->DR;   // read conversion result; EOC is cleared by this read
-    m_rxBuffer.put(sample, control);
+    m_rxBuffer.put(sample);
 #if defined(SEND_RSSI_DATA)
     rawRSSI = ADC2->DR;
     m_rssiBuffer.put(rawRSSI);
@@ -431,7 +441,30 @@ void CIO::setP25Int(bool on)
 
 void CIO::setNXDNInt(bool on)
 {
+#if defined(USE_ALTERNATE_NXDN_LEDS)
+  BB_YSF = !!on;
+  BB_P25 = !!on;
+#else
   BB_NXDN = !!on;
+#endif
+}
+
+void CIO::setPOCSAGInt(bool on)
+{
+#if defined(USE_ALTERNATE_POCSAG_LEDS)
+  BB_DSTAR = !!on;
+  BB_DMR   = !!on;
+#else
+  BB_POCSAG = !!on;
+#endif
+}
+
+void CIO::setFMInt(bool on)
+{
+#if defined(USE_ALTERNATE_FM_LEDS)
+  BB_DSTAR = !!on;
+  BB_YSF   = !!on;
+#endif
 }
 
 void CIO::delayInt(unsigned int dly)

IOTeensy.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -34,7 +34,15 @@
 #define PIN_DMR                10
 #define PIN_YSF                11
 #define PIN_P25                12
-#define PIN_NXDN               8
+#if defined(__MK20DX256__)
+#define PIN_NXDN               2
+#define PIN_POCSAG             3
+#define PIN_FM                 4
+#else
+#define PIN_NXDN               24
+#define PIN_POCSAG             25
+#define PIN_FM                 26
+#endif
 #define PIN_ADC                5        // A0,  Pin 14
 #define PIN_RSSI               4        // Teensy 3.5/3.6, A16, Pin 35. Teensy 3.1/3.2, A17, Pin 28
 
@@ -58,14 +66,22 @@ void CIO::initInt()
   pinMode(PIN_LED,    OUTPUT);
   pinMode(PIN_COS,    INPUT);
 
-#if defined(ARDUINO_MODE_PINS)
+#if defined(MODE_LEDS)
   // Set up the mode output pins
   pinMode(PIN_DSTAR,  OUTPUT);
   pinMode(PIN_DMR,    OUTPUT);
   pinMode(PIN_YSF,    OUTPUT);
   pinMode(PIN_P25,    OUTPUT);
+#if !defined(USE_ALTERNATE_NXDN_LEDS)
   pinMode(PIN_NXDN,   OUTPUT);
 #endif
+#if !defined(USE_ALTERNATE_POCSAG_LEDS)
+  pinMode(PIN_POCSAG, OUTPUT);
+#endif
+#if !defined(USE_ALTERNATE_FM_LEDS)
+  pinMode(PIN_FM,     OUTPUT);
+#endif
+#endif
 }
 
 void CIO::startInt()
@@ -145,15 +161,14 @@ void CIO::startInt()
 
 void CIO::interrupt()
 {
-  uint8_t control = MARK_NONE;
+   TSample sample = {DC_OFFSET, MARK_NONE};
-  uint16_t sample = DC_OFFSET;
 
-  m_txBuffer.get(sample, control);
+  m_txBuffer.get(sample);
-  *(int16_t *)&(DAC0_DAT0L) = sample;
+  *(int16_t *)&(DAC0_DAT0L) = sample.sample;
 
   if ((ADC0_SC1A & ADC_SC1_COCO) == ADC_SC1_COCO) {
-    sample = ADC0_RA;
+    sample.sample = ADC0_RA;
-    m_rxBuffer.put(sample, control);
+    m_rxBuffer.put(sample);
   }
     
 #if defined(SEND_RSSI_DATA)
@@ -212,9 +227,34 @@ void CIO::setP25Int(bool on)
   digitalWrite(PIN_P25, on ? HIGH : LOW);
 }
 
-void CIO::setNXDNInt(bool on) 
+void CIO::setNXDNInt(bool on)
 {
+#if defined(USE_ALTERNATE_NXDN_LEDS)
+  digitalWrite(PIN_YSF, on ? HIGH : LOW);
+  digitalWrite(PIN_P25, on ? HIGH : LOW);
+#else
   digitalWrite(PIN_NXDN, on ? HIGH : LOW);
+#endif
+}
+
+void CIO::setPOCSAGInt(bool on)
+{
+#if defined(USE_ALTERNATE_POCSAG_LEDS)
+  digitalWrite(PIN_DSTAR, on ? HIGH : LOW);
+  digitalWrite(PIN_DMR,   on ? HIGH : LOW);
+#else
+  digitalWrite(PIN_POCSAG, on ? HIGH : LOW);
+#endif
+}
+
+void CIO::setFMInt(bool on)
+{
+#if defined(USE_ALTERNATE_FM_LEDS)
+  digitalWrite(PIN_DSTAR, on ? HIGH : LOW);
+  digitalWrite(PIN_YSF,   on ? HIGH : LOW);
+#else
+  digitalWrite(PIN_FM, on ? HIGH : LOW);
+#endif
 }
 
 void CIO::delayInt(unsigned int dly)

MMDVM.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Mathis Schmieder DB9MAT
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
@@ -26,11 +26,14 @@
 // Global variables
 MMDVM_STATE m_modemState = STATE_IDLE;
 
-bool m_dstarEnable = true;
+bool m_dstarEnable  = true;
-bool m_dmrEnable   = true;
+bool m_dmrEnable    = true;
-bool m_ysfEnable   = true;
+bool m_ysfEnable    = true;
-bool m_p25Enable   = true;
+bool m_p25Enable    = true;
-bool m_nxdnEnable  = true;
+bool m_nxdnEnable   = true;
+bool m_pocsagEnable = true;
+bool m_fmEnable     = true;
+bool m_ax25Enable   = true;
 
 bool m_duplex = true;
 
@@ -56,11 +59,19 @@ CP25TX     p25TX;
 CNXDNRX    nxdnRX;
 CNXDNTX    nxdnTX;
 
+CPOCSAGTX  pocsagTX;
+
+CFM        fm;
+CAX25RX    ax25RX;
+CAX25TX    ax25TX;
+
 CCalDStarRX calDStarRX;
 CCalDStarTX calDStarTX;
 CCalDMR     calDMR;
 CCalP25     calP25;
 CCalNXDN    calNXDN;
+CCalFM      calFM;
+CCalPOCSAG  calPOCSAG;
 CCalRSSI    calRSSI;
 
 CCWIdTX cwIdTX;
@@ -99,6 +110,15 @@ void loop()
   if (m_nxdnEnable && m_modemState == STATE_NXDN)
     nxdnTX.process();
 
+  if (m_pocsagEnable && (m_modemState == STATE_POCSAG || pocsagTX.busy()))
+    pocsagTX.process();
+
+  if (m_ax25Enable && (m_modemState == STATE_IDLE || m_modemState == STATE_FM))
+    ax25TX.process();
+
+  if (m_fmEnable && m_modemState == STATE_FM)
+    fm.process();
+
   if (m_modemState == STATE_DSTARCAL)
     calDStarTX.process();
 
@@ -111,6 +131,12 @@ void loop()
   if (m_modemState == STATE_NXDNCAL1K)
     calNXDN.process();
 
+  if (m_modemState == STATE_POCSAGCAL)
+    calPOCSAG.process();
+
+  if (m_modemState == STATE_FMCAL10K || m_modemState == STATE_FMCAL12K || m_modemState == STATE_FMCAL15K || m_modemState == STATE_FMCAL20K || m_modemState == STATE_FMCAL25K ||m_modemState == STATE_FMCAL30K)
+    calFM.process();
+
   if (m_modemState == STATE_IDLE)
     cwIdTX.process();
 }

MMDVM.ino

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016 by Colin Durbridge G4EML
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -23,11 +23,14 @@
 // Global variables
 MMDVM_STATE m_modemState = STATE_IDLE;
 
-bool m_dstarEnable = true;
+bool m_dstarEnable  = true;
-bool m_dmrEnable   = true;
+bool m_dmrEnable    = true;
-bool m_ysfEnable   = true;
+bool m_ysfEnable    = true;
-bool m_p25Enable   = true;
+bool m_p25Enable    = true;
-bool m_nxdnEnable  = true;
+bool m_nxdnEnable   = true;
+bool m_pocsagEnable = true;
+bool m_fmEnable     = true;
+bool m_ax25Enable   = true;
 
 bool m_duplex = true;
 
@@ -53,11 +56,19 @@ CP25TX     p25TX;
 CNXDNRX    nxdnRX;
 CNXDNTX    nxdnTX;
 
+CPOCSAGTX  pocsagTX;
+
+CFM        fm;
+CAX25RX    ax25RX;
+CAX25TX    ax25TX;
+
 CCalDStarRX calDStarRX;
 CCalDStarTX calDStarTX;
 CCalDMR     calDMR;
+CCalFM      calFM;
 CCalP25     calP25;
 CCalNXDN    calNXDN;
+CCalPOCSAG  calPOCSAG;
 CCalRSSI    calRSSI;
 
 CCWIdTX cwIdTX;
@@ -96,19 +107,33 @@ void loop()
   if (m_nxdnEnable && m_modemState == STATE_NXDN)
     nxdnTX.process();
 
+  if (m_pocsagEnable && (m_modemState == STATE_POCSAG || pocsagTX.busy()))
+    pocsagTX.process();
+
+  if (m_ax25Enable && (m_modemState == STATE_IDLE || m_modemState == STATE_FM))
+    ax25TX.process();
+
+  if (m_fmEnable && m_modemState == STATE_FM)
+    fm.process();
+
   if (m_modemState == STATE_DSTARCAL)
     calDStarTX.process();
 
   if (m_modemState == STATE_DMRCAL || m_modemState == STATE_LFCAL || m_modemState == STATE_DMRCAL1K || m_modemState == STATE_DMRDMO1K)
     calDMR.process();
 
+  if (m_modemState == STATE_FMCAL10K || m_modemState == STATE_FMCAL12K || m_modemState == STATE_FMCAL15K || m_modemState == STATE_FMCAL20K || m_modemState == STATE_FMCAL25K || m_modemState == STATE_FMCAL30K)
+    calFM.process();
+
   if (m_modemState == STATE_P25CAL1K)
     calP25.process();
 
   if (m_modemState == STATE_NXDNCAL1K)
     calNXDN.process();
 
+  if (m_modemState == STATE_POCSAGCAL)
+    calPOCSAG.process();
+
   if (m_modemState == STATE_IDLE)
     cwIdTX.process();
 }
-

MMDVM_STM32F4xx.coproj

@@ -1,338 +0,0 @@
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-          <Define name="HSE_VALUE=8000000"/>
-          <Define name="STM32F4_DISCOVERY"/>
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-        </DefinedSymbols>
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-        <UserRun name="Run#1" type="After" checked="0" value=""/>
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-      <Option name="org.coocox.codebugger.gdbjtag.core.portNumber" value="2009"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.autoDownload" value="1"/>
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-      <Option name="org.coocox.codebugger.gdbjtag.core.downloadFuction" value="Erase Effected"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.defaultAlgorithm" value="STM32F4xx_1024.elf"/>
-    </DebugOption>
-    <ExcludeFile/>
-  </Target>
-  <Target name="MMDVM_Pi_446" isCurrent="0">
-    <Device manufacturerId="9" manufacturerName="ST" chipId="344" chipName="STM32F407VG" boardId="" boardName=""/>
-    <BuildOption>
-      <Compile>
-        <Option name="OptimizationLevel" value="4"/>
-        <Option name="UseFPU" value="0"/>
-        <Option name="UserEditCompiler" value=""/>
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-        <Option name="FPU" value="2"/>
-        <Includepaths>
-          <Includepath path="."/>
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-          <Define name="HSE_VALUE=12000000"/>
-          <Define name="STM32F4_PI"/>
-          <Define name="ARDUINO_MODE_PINS"/>
-        </DefinedSymbols>
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-      <Link useDefault="0">
-        <Option name="DiscardUnusedSection" value="0"/>
-        <Option name="UserEditLinkder" value=""/>
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-        <Option name="nostartfiles" value="1"/>
-        <Option name="LTO" value="0"/>
-        <Option name="IsNewStartupCode" value="1"/>
-        <Option name="Library" value="Semihosting"/>
-        <Option name="UserEditLinker" value="-lstdc++; --specs=nano.specs;"/>
-        <LinkedLibraries>
-          <Libset dir="stm32f4xx_lib\cmsis\lib\gcc\" libs="arm_cortexm4lf_math"/>
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-        <MemoryAreas debugInFlashNotRAM="1">
-          <Memory name="IROM1" type="ReadOnly" size="0x00100000" startValue="0x08000000"/>
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-          <Memory name="IRAM2" type="ReadWrite" size="0x00010000" startValue="0x10000000"/>
-        </MemoryAreas>
-        <LocateLinkFile path="./stm32f4xx_link.ld" type="0"/>
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-      <Output>
-        <Option name="OutputFileType" value="0"/>
-        <Option name="Path" value="./"/>
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-        <Option name="HEX" value="1"/>
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-        <UserRun name="Run#1" type="After" checked="0" value=""/>
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-    </BuildOption>
-    <DebugOption>
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-      <Option name="org.coocox.codebugger.gdbjtag.core.debugMode" value="SWD"/>
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-      <Option name="org.coocox.codebugger.gdbjtag.core.ifSemihost" value="0"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.ifCacheRom" value="1"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.ipAddress" value="127.0.0.1"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.portNumber" value="2009"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.autoDownload" value="1"/>
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-      <Option name="org.coocox.codebugger.gdbjtag.core.downloadFuction" value="Erase Effected"/>
-      <Option name="org.coocox.codebugger.gdbjtag.core.defaultAlgorithm" value="STM32F4xx_1024.elf"/>
-    </DebugOption>
-    <ExcludeFile/>
-  </Target>
-  <Target name="MMDVM_Nucleo_446" isCurrent="0">
-    <Device manufacturerId="9" manufacturerName="ST" chipId="344" chipName="STM32F407VG" boardId="" boardName=""/>
-    <BuildOption>
-      <Compile>
-        <Option name="OptimizationLevel" value="4"/>
-        <Option name="UseFPU" value="0"/>
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-        <LinkedLibraries>
-          <Libset dir="stm32f4xx_lib\cmsis\lib\gcc\" libs="arm_cortexm4lf_math"/>
-        </LinkedLibraries>
-        <MemoryAreas debugInFlashNotRAM="1">
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-  </Components>
-  <Files>
-    <File name="DMRIdleRX.h" path="DMRIdleRX.h" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_dac.c" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_dac.c" type="1"/>
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-    <File name="STM32F4XX_Lib/CMSIS" path="" type="2"/>
-    <File name="SerialArduino.cpp" path="SerialArduino.cpp" type="1"/>
-    <File name="SerialPort.cpp" path="SerialPort.cpp" type="1"/>
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-    <File name="DStarTX.cpp" path="DStarTX.cpp" type="1"/>
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-    <File name="DMRDMORX.h" path="DMRDMORX.h" type="1"/>
-    <File name="SerialPort.h" path="SerialPort.h" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_dac.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_dac.h" type="1"/>
-    <File name="CWIdTX.h" path="CWIdTX.h" type="1"/>
-    <File name="STM32F4XX_Lib/Device/system_stm32f4xx.h" path="STM32F4XX_Lib/Device/system_stm32f4xx.h" type="1"/>
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-    <File name="IODue.cpp" path="IODue.cpp" type="1"/>
-    <File name="DMRTX.cpp" path="DMRTX.cpp" type="1"/>
-    <File name="P25RX.cpp" path="P25RX.cpp" type="1"/>
-    <File name="STM32F4XX_Lib/CMSIS/Lib/GCC" path="" type="2"/>
-    <File name="STM32F4XX_Lib" path="" type="2"/>
-    <File name="STM32F4XX_Lib/CMSIS/Include/core_cmInstr.h" path="STM32F4XX_Lib/CMSIS/Include/core_cmInstr.h" type="1"/>
-    <File name="DMRTX.h" path="DMRTX.h" type="1"/>
-    <File name="STM32F4XX_Lib/Device/system_stm32f4xx.c" path="STM32F4XX_Lib/Device/system_stm32f4xx.c" type="1"/>
-    <File name="RSSIRB.h" path="RSSIRB.h" type="1"/>
-    <File name="STM32F4XX_Lib/Device/startup/startup_stm32f4xx.c" path="STM32F4XX_Lib/Device/startup/startup_stm32f4xx.c" type="1"/>
-    <File name="STM32F4XX_Lib/Device/startup" path="" type="2"/>
-    <File name="SerialRB.h" path="SerialRB.h" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_gpio.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_gpio.h" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver" path="" type="2"/>
-    <File name="DMRDefines.h" path="DMRDefines.h" type="1"/>
-    <File name="CalDMR.cpp" path="CalDMR.cpp" type="1"/>
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-    <File name="SerialSTM.cpp" path="SerialSTM.cpp" type="1"/>
-    <File name="STM32F4XX_Lib/CMSIS/Lib/GCC/libarm_cortexM4lf_math.a" path="STM32F4XX_Lib/CMSIS/Lib/GCC/libarm_cortexM4lf_math.a" type="1"/>
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-    <File name="DStarRX.h" path="DStarRX.h" type="1"/>
-    <File name="Config.h" path="Config.h" type="1"/>
-    <File name="DMRSlotType.cpp" path="DMRSlotType.cpp" type="1"/>
-    <File name="Globals.h" path="Globals.h" type="1"/>
-    <File name="STM32F4XX_Lib/Device" path="" type="2"/>
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-    <File name="Utils.cpp" path="Utils.cpp" type="1"/>
-    <File name="STM32F4XX_Lib/CMSIS/.DS_Store" path="STM32F4XX_Lib/CMSIS/.DS_Store" type="1"/>
-    <File name="STM32F4XX_Lib/CMSIS/Lib/.DS_Store" path="STM32F4XX_Lib/CMSIS/Lib/.DS_Store" type="1"/>
-    <File name="Utils.h" path="Utils.h" type="1"/>
-    <File name="STM32F4XX_Lib/CMSIS/Lib" path="" type="2"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/.DS_Store" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/.DS_Store" type="1"/>
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-    <File name="STM32F4XX_Lib/CMSIS/Include/arm_math.h" path="STM32F4XX_Lib/CMSIS/Include/arm_math.h" type="1"/>
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-    <File name="P25Defines.h" path="P25Defines.h" type="1"/>
-    <File name="DMRSlotType.h" path="DMRSlotType.h" type="1"/>
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-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/misc.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/misc.h" type="1"/>
-    <File name="P25TX.h" path="P25TX.h" type="1"/>
-    <File name="RSSIRB.cpp" path="RSSIRB.cpp" type="1"/>
-    <File name="DStarRX.cpp" path="DStarRX.cpp" type="1"/>
-    <File name="DMRSlotRX.cpp" path="DMRSlotRX.cpp" type="1"/>
-    <File name="IOSTM.cpp" path="IOSTM.cpp" type="1"/>
-    <File name="P25TX.cpp" path="P25TX.cpp" type="1"/>
-    <File name="SerialRB.cpp" path="SerialRB.cpp" type="1"/>
-    <File name="CWIdTX.cpp" path="CWIdTX.cpp" type="1"/>
-    <File name="DMRIdleRX.cpp" path="DMRIdleRX.cpp" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_usart.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_usart.h" type="1"/>
-    <File name="STM32F4XX_Lib/.DS_Store" path="STM32F4XX_Lib/.DS_Store" type="1"/>
-    <File name="YSFTX.cpp" path="YSFTX.cpp" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_gpio.c" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_gpio.c" type="1"/>
-  </Files>
-</Project>

Makefile

@@ -1,4 +1,4 @@
-#  Copyright (C) 2016,2017 by Andy Uribe CA6JAU
+#  Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
 #  Copyright (C) 2016 by Jim McLaughlin KI6ZUM
 
 #  This program is free software; you can redistribute it and/or modify
@@ -25,6 +25,7 @@ F7_LIB_PATH=./STM32F7XX_Lib
 # MCU external clock frequency (Hz)
 CLK_MMDVM_PI=12000000
 CLK_NUCLEO=8000000
+CLK_12MHZ=12000000
 
 # Directory Structure
 BINDIR=bin
@@ -93,6 +94,8 @@ ifndef $(OSC)
 		OSC=$(CLK_MMDVM_PI)
 	else ifeq ($(MAKECMDGOALS),pi-f722)
 		OSC=$(CLK_MMDVM_PI)
+	else ifeq ($(MAKECMDGOALS),drcc_nqf)
+		OSC=$(CLK_12MHZ)
 	else
 		OSC=$(CLK_NUCLEO)
 	endif
@@ -126,6 +129,21 @@ DEFS_NUCLEO=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F446xx -DSTM32F4_NUCLEO -D
 DEFS_NUCLEO_F767=-DUSE_HAL_DRIVER -DSTM32F767xx -DSTM32F7XX -DSTM32F7_NUCLEO -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
 # MMDVM-Pi F722 board:
 DEFS_PI_F722=-DUSE_HAL_DRIVER -DSTM32F722xx -DSTM32F7XX -DSTM32F722_PI -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# MMDVM-F7M F0DEI board:
+DEFS_F7M=-DUSE_HAL_DRIVER -DSTM32F722xx -DSTM32F7XX -DSTM32F722_F7M -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# MMDVM_RPT_Hat F0DEI, DB9MAT, DF2ET board:
+DEFS_RPT_HAT=-DUSE_HAL_DRIVER -DSTM32F722xx -DSTM32F7XX -DSTM32F722_RPT_HAT -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# STM32F4 DVM board:
+DEFS_DVM=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F446xx -DSTM32F4_DVM -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# MMDVM_RPT_Hat BG4TGO, BG5HHP board:
+DEFS_RPT_HAT_TGO=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F40_41xxx -DSTM32F4_RPT_HAT_TGO -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# DRCC_DVM BG7NQF board:
+DEFS_DRCC_DVM=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F446xx -DDRCC_DVM -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# WA0EDA F405 MTR2K, MASTR3 board:
+DEFS_EDA_405=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F40_41xxx -DSTM32F4_EDA_405 -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+# WA0EDA F446 MTR2K, MASTR3 board:
+DEFS_EDA_446=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F446xx -DSTM32F4_EDA_446 -DHSE_VALUE=$(OSC) -DMADEBYMAKEFILE
+
 
 # Build compiler flags
 CFLAGS_F4=-c $(MCFLAGS_F4) $(INCLUDES_F4)
@@ -141,10 +159,10 @@ LDFLAGS_F722 =-T stm32f722_link.ld $(MCFLAGS_F7) --specs=nosys.specs $(INCLUDES_
 # Common flags
 CFLAGS=-Os -ffunction-sections -fdata-sections -fno-builtin -Wno-implicit -DCUSTOM_NEW -DNO_EXCEPTIONS
 CXXFLAGS=-Os -fno-exceptions -ffunction-sections -fdata-sections -fno-builtin -fno-rtti -DCUSTOM_NEW -DNO_EXCEPTIONS
-LDFLAGS=-Os --specs=nano.specs
+LDFLAGS=-Os --specs=nano.specs -Wl,-Map=bin/mmdvm.map
 
 # Build Rules
-.PHONY: all release dis pi pi_f722 f4m nucleo f767 clean
+.PHONY: all release dis pi pi-f722 f4m nucleo f767 dvm drcc_nqf clean
 
 # Default target: Nucleo-64 F446RE board
 all: nucleo
@@ -167,6 +185,24 @@ f4m: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_F4M)
 f4m: LDFLAGS+=$(LDFLAGS_F4)
 f4m: release_f4
 
+f7m: GitVersion.h
+f7m: CFLAGS+=$(CFLAGS_F7) $(DEFS_F7M)
+f7m: CXXFLAGS+=$(CXXFLAGS_F7) $(DEFS_F7M)
+f7m: LDFLAGS+=$(LDFLAGS_F722)
+f7m: release_f7
+
+rpt_hat: GitVersion.h
+rpt_hat: CFLAGS+=$(CFLAGS_F7) $(DEFS_RPT_HAT)
+rpt_hat: CXXFLAGS+=$(CXXFLAGS_F7) $(DEFS_RPT_HAT)
+rpt_hat: LDFLAGS+=$(LDFLAGS_F722)
+rpt_hat: release_f7
+
+rpt_hat_tgo: GitVersion.h
+rpt_hat_tgo: CFLAGS+=$(CFLAGS_F4) $(DEFS_RPT_HAT_TGO)
+rpt_hat_tgo: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_RPT_HAT_TGO)
+rpt_hat_tgo: LDFLAGS+=$(LDFLAGS_F4)
+rpt_hat_tgo: release_f4
+
 nucleo: GitVersion.h
 nucleo: CFLAGS+=$(CFLAGS_F4) $(DEFS_NUCLEO)
 nucleo: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_NUCLEO)
@@ -185,6 +221,30 @@ f767: CXXFLAGS+=$(CXXFLAGS_F7) $(DEFS_NUCLEO_F767)
 f767: LDFLAGS+=$(LDFLAGS_F767)
 f767: release_f7
 
+dvm: GitVersion.h
+dvm: CFLAGS+=$(CFLAGS_F4) $(DEFS_DVM)
+dvm: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_DVM)
+dvm: LDFLAGS+=$(LDFLAGS_F4)
+dvm: release_f4
+
+drcc_nqf: GitVersion.h
+drcc_nqf: CFLAGS+=$(CFLAGS_F4) $(DEFS_DRCC_DVM) -DDRCC_DVM_NQF
+drcc_nqf: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_DRCC_DVM) -DDRCC_DVM_NQF
+drcc_nqf: LDFLAGS+=$(LDFLAGS_F4)
+drcc_nqf: release_f4
+
+eda405: GitVersion.h
+eda405: CFLAGS+=$(CFLAGS_F4) $(DEFS_EDA_405)
+eda405: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_EDA_405)
+eda405: LDFLAGS+=$(LDFLAGS_F4)
+eda405: release_f4
+
+eda446: GitVersion.h
+eda446: CFLAGS+=$(CFLAGS_F4) $(DEFS_EDA_446)
+eda446: CXXFLAGS+=$(CXXFLAGS_F4) $(DEFS_EDA_446)
+eda446: LDFLAGS+=$(LDFLAGS_F4)
+eda446: release_f4
+
 release_f4: $(BINDIR)
 release_f4: $(OBJDIR_F4)
 release_f4: $(BINDIR)/$(BINHEX_F4)
@@ -207,7 +267,7 @@ $(OBJDIR_F7):
 $(BINDIR)/$(BINHEX_F4): $(BINDIR)/$(BINELF_F4)
 	$(CP) -O ihex $< $@
 	@echo "Objcopy from ELF to IHEX complete!\n"
-	
+
 $(BINDIR)/$(BINBIN_F4): $(BINDIR)/$(BINELF_F4)
 	$(CP) -O binary $< $@
 	@echo "Objcopy from ELF to BINARY complete!\n"
@@ -220,7 +280,7 @@ $(BINDIR)/$(BINELF_F4): $(OBJ_F4)
 $(BINDIR)/$(BINHEX_F7): $(BINDIR)/$(BINELF_F7)
 	$(CP) -O ihex $< $@
 	@echo "Objcopy from ELF to IHEX complete!\n"
-	
+
 $(BINDIR)/$(BINBIN_F7): $(BINDIR)/$(BINELF_F7)
 	$(CP) -O binary $< $@
 	@echo "Objcopy from ELF to BINARY complete!\n"
@@ -305,20 +365,23 @@ ifneq ($(wildcard /usr/bin/stm32flash),)
 endif
 
 deploy-f4m: deploy-pi
+deploy-dvm: deploy-pi
+deploy-eda405: deploy-pi
+deploy-eda446: deploy-pi
 
 deploy-pi-f7:
 ifneq ($(wildcard /usr/local/bin/stm32flash),)
 	-/usr/local/bin/stm32flash -i 20,-21,21:-20,21 /dev/ttyAMA0
-	-/usr/local/bin/stm32ld /dev/ttyAMA0 57600 bin/$(BINBIN_F7)
 	/usr/local/bin/stm32flash -v -w bin/$(BINBIN_F7) -g 0x0 -R -c /dev/ttyAMA0
-endif
 
-ifneq ($(wildcard /usr/bin/stm32flash),)
+else ifneq ($(wildcard /usr/bin/stm32flash),)
 	-/usr/bin/stm32flash -i 20,-21,21:-20,21 /dev/ttyAMA0
-	-/usr/bin/stm32ld /dev/ttyAMA0 57600 bin/$(BINBIN_F7)
 	/usr/bin/stm32flash -v -w bin/$(BINBIN_F7) -g 0x0 -R -c /dev/ttyAMA0
 endif
 
+deploy-f7m:   deploy-pi-f7
+deploy-rpt_hat: deploy-pi-f7
+
 # Export the current git version if the index file exists, else 000...
 GitVersion.h:
 ifdef SYSTEMROOT
@@ -332,3 +395,7 @@ else
 	echo "#define GITVERSION \"0000000\"" > $@
 endif
 endif
+
+flash_f4:
+	@echo "flashing firmware..."
+	st-flash write bin/$(BINBIN_F4) 0x8000000

Makefile.Arduino

@@ -1,5 +1,5 @@
 #!/usr/bin/make
-# makefile for the arduino due (works with arduino IDE 1.6.11)
+# makefile for the arduino due (works with arduino IDE 1.6.12)
 #
 # The original file can be found at https://github.com/pauldreik/arduino-due-makefile
 #
@@ -34,7 +34,7 @@ OBJCOPY:=$(ADIR)/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-n
 
 C:=$(CC)
 #SAM:=arduino/sam/
-SAM:=$(ADIR)/packages/arduino/hardware/sam/1.6.11
+SAM:=$(ADIR)/packages/arduino/hardware/sam/1.6.12
 #CMSIS:=arduino/sam/system/CMSIS/
 #LIBSAM:=arduino/sam/system/libsam
 TMPDIR:=$(PWD)/build

Makefile.CMSIS

@@ -25,7 +25,7 @@ STARTUP:=$(SYSDIR)/startup_stm32f105xc.S
 STARTUP_DEFS=
 
 # Include directory for CMSIS
-CMSISDIR:=/opt/STM32Cube_FW_F1_V1.4.0/Drivers/CMSIS
+CMSISDIR:=STM32F10X_Lib/CMSIS
 
 # Libraries
 LIBDIR:=
@@ -65,7 +65,7 @@ COMMON_FLAGS =-mthumb -mlittle-endian -mcpu=$(MCPU)
 COMMON_FLAGS+= -Wall
 COMMON_FLAGS+= -I. -I$(CMSISDIR)/Include -I$(CMSISDIR)/Device/ST/STM32F1xx/Include -I$(SYSDIR)
 COMMON_FLAGS+=  $(addprefix -I,$(INCDIR))
-COMMON_FLAGS+= -D$(MCU)
+COMMON_FLAGS+= -D$(MCU) -DMADEBYMAKEFILE -DSTM32F1
 COMMON_FLAGS+= -Os -flto -ffunction-sections -fdata-sections
 COMMON_FLAGS+= -g
 # Assembler flags
@@ -91,7 +91,7 @@ DEPENDS:=$(CSRC:%.c=$(OBJDIR)/%.d) $(CXXSRC:%.cpp=$(OBJDIR)/%.d)
 
 # Targets
 .PHONY: all
-all: $(DIS) $(HEX)
+all: GitVersion.h $(DIS) $(HEX)
 	$(SIZE) $(ELF)
 
 .PHONY: program
@@ -116,7 +116,7 @@ debug: $(ELF)
 
 .PHONY: clean
 clean:
-	$(RM) $(OBJ) $(HEX) $(ELF) $(DIS) $(MAP) $(DEPENDS)
+	$(RM) $(OBJ) $(HEX) $(ELF) $(DIS) $(MAP) $(DEPENDS) GitVersion.h
 
 # implicit rules
 .elf.hex:
@@ -149,3 +149,17 @@ $(DIS): $(ELF)
 
 # include dependecies
 -include $(DEPENDS)
+
+# Export the current git version if the index file exists, else 000...
+GitVersion.h:
+ifdef SYSTEMROOT
+	echo #define GITVERSION "0000000" > $@
+else ifdef SystemRoot
+	echo #define GITVERSION "0000000" > $@
+else
+ifneq ("$(wildcard .git/index)","")
+	echo "#define GITVERSION \"$(shell git rev-parse --short HEAD)\"" > $@
+else
+	echo "#define GITVERSION \"0000000\"" > $@
+endif
+endif

NXDNTX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2017 by Andy Uribe CA6JAU
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -45,7 +45,7 @@ const uint8_t NXDN_PREAMBLE[] = {0x57U, 0x75U, 0xFDU};
 const uint8_t NXDN_SYNC = 0x5FU;
 
 CNXDNTX::CNXDNTX() :
-m_buffer(2000U),
+m_buffer(TX_BUFFER_LEN),
 m_modFilter(),
 m_sincFilter(),
 m_modState(),
@@ -53,7 +53,9 @@ m_sincState(),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
-m_txDelay(240U)      // 200ms
+m_txDelay(240U),     // 200ms
+m_txHang(3000U),     // 5s
+m_txCount(0U)
 {
   ::memset(m_modState, 0x00U, 16U * sizeof(q15_t));
   ::memset(m_sincState,  0x00U, 70U * sizeof(q15_t));
@@ -70,10 +72,7 @@ m_txDelay(240U)      // 200ms
 
 void CNXDNTX::process()
 {
-  if (m_buffer.getData() == 0U && m_poLen == 0U)
+  if (m_poLen == 0U && m_buffer.getData() > 0U) {
-    return;
-
-  if (m_poLen == 0U) {
     if (!m_tx) {
       for (uint16_t i = 0U; i < m_txDelay; i++)
         m_poBuffer[m_poLen++] = NXDN_SYNC;
@@ -82,7 +81,8 @@ void CNXDNTX::process()
       m_poBuffer[m_poLen++] = NXDN_PREAMBLE[2U];
     } else {
       for (uint8_t i = 0U; i < NXDN_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c = m_buffer.get();
+        uint8_t c = 0U;
+        m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
     }
@@ -98,6 +98,8 @@ void CNXDNTX::process()
       writeByte(c);
 
       space -= 4U * NXDN_RADIO_SYMBOL_LENGTH;
+      if (m_duplex)
+        m_txCount = m_txHang;
       
       if (m_poPtr >= m_poLen) {
         m_poPtr = 0U;
@@ -105,10 +107,23 @@ void CNXDNTX::process()
         return;
       }
     }
+  } else if (m_txCount > 0U) {
+    // Transmit silence until the hang timer has expired.
+    uint16_t space = io.getSpace();
+
+    while (space > (4U * NXDN_RADIO_SYMBOL_LENGTH)) {
+      writeSilence();
+
+      space -= 4U * NXDN_RADIO_SYMBOL_LENGTH;
+      m_txCount--;
+
+      if (m_txCount == 0U)
+        return;
+    }
   }
 }
 
-uint8_t CNXDNTX::writeData(const uint8_t* data, uint8_t length)
+uint8_t CNXDNTX::writeData(const uint8_t* data, uint16_t length)
 {
   if (length != (NXDN_FRAME_LENGTH_BYTES + 1U))
     return 4U;
@@ -155,6 +170,19 @@ void CNXDNTX::writeByte(uint8_t c)
   io.write(STATE_NXDN, outBuffer, NXDN_RADIO_SYMBOL_LENGTH * 4U);
 }
 
+void CNXDNTX::writeSilence()
+{
+  q15_t inBuffer[4U] = {0x00U, 0x00U, 0x00U, 0x00U};
+  q15_t intBuffer[NXDN_RADIO_SYMBOL_LENGTH * 4U];
+  q15_t outBuffer[NXDN_RADIO_SYMBOL_LENGTH * 4U];
+
+  ::arm_fir_interpolate_q15(&m_modFilter, inBuffer, intBuffer, 4U);
+
+  ::arm_fir_fast_q15(&m_sincFilter, intBuffer, outBuffer, NXDN_RADIO_SYMBOL_LENGTH * 4U);
+
+  io.write(STATE_NXDN, outBuffer, NXDN_RADIO_SYMBOL_LENGTH * 4U);
+}
+
 void CNXDNTX::setTXDelay(uint8_t delay)
 {
   m_txDelay = 300U + uint16_t(delay) * 6U;        // 500ms + tx delay
@@ -168,3 +196,7 @@ uint8_t CNXDNTX::getSpace() const
   return m_buffer.getSpace() / NXDN_FRAME_LENGTH_BYTES;
 }
 
+void CNXDNTX::setParams(uint8_t txHang)
+{
+  m_txHang = txHang * 600U;
+}

NXDNTX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -21,13 +21,13 @@
 
 #include "Config.h"
 
-#include "SerialRB.h"
+#include "RingBuffer.h"
 
 class CNXDNTX {
 public:
   CNXDNTX();
 
-  uint8_t writeData(const uint8_t* data, uint8_t length);
+  uint8_t writeData(const uint8_t* data, uint16_t length);
 
   void process();
 
@@ -35,8 +35,10 @@ public:
 
   uint8_t getSpace() const;
 
+  void setParams(uint8_t txHang);
+
 private:
-  CSerialRB                        m_buffer;
+  CRingBuffer<uint8_t>                        m_buffer;
   arm_fir_interpolate_instance_q15 m_modFilter;
   arm_fir_instance_q15             m_sincFilter;
   q15_t                            m_modState[16U];    // blockSize + phaseLength - 1, 4 + 9 - 1 plus some spare
@@ -45,9 +47,11 @@ private:
   uint16_t                         m_poLen;
   uint16_t                         m_poPtr;
   uint16_t                         m_txDelay;
+  uint32_t                         m_txHang;
+  uint32_t                         m_txCount;
 
   void writeByte(uint8_t c);
+  void writeSilence();
 };
 
 #endif
-

P25Defines.h

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2018 by Bryan Biedenkapp <[email protected]>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -41,14 +42,25 @@ const unsigned int P25_TERM_FRAME_LENGTH_BITS      = P25_TERM_FRAME_LENGTH_BYTES
 const unsigned int P25_TERM_FRAME_LENGTH_SYMBOLS   = P25_TERM_FRAME_LENGTH_BYTES * 4U;
 const unsigned int P25_TERM_FRAME_LENGTH_SAMPLES   = P25_TERM_FRAME_LENGTH_SYMBOLS * P25_RADIO_SYMBOL_LENGTH;
 
+const unsigned int P25_TSDU_FRAME_LENGTH_BYTES     = 45U;
+const unsigned int P25_TSDU_FRAME_LENGTH_BITS      = P25_TSDU_FRAME_LENGTH_BYTES * 8U; 
+const unsigned int P25_TSDU_FRAME_LENGTH_SYMBOLS   = P25_TSDU_FRAME_LENGTH_BYTES * 4U; 
+const unsigned int P25_TSDU_FRAME_LENGTH_SAMPLES   = P25_TSDU_FRAME_LENGTH_SYMBOLS * P25_RADIO_SYMBOL_LENGTH;
+
+const unsigned int P25_PDU_HDR_FRAME_LENGTH_BYTES = 45U;
+const unsigned int P25_PDU_HDR_FRAME_LENGTH_BITS = P25_PDU_HDR_FRAME_LENGTH_BYTES * 8U;
+const unsigned int P25_PDU_HDR_FRAME_LENGTH_SYMBOLS = P25_PDU_HDR_FRAME_LENGTH_BYTES * 4U;
+const unsigned int P25_PDU_HDR_FRAME_LENGTH_SAMPLES = P25_PDU_HDR_FRAME_LENGTH_SYMBOLS * P25_RADIO_SYMBOL_LENGTH;
+
 const unsigned int P25_SYNC_LENGTH_BYTES   = 6U;
 const unsigned int P25_SYNC_LENGTH_BITS    = P25_SYNC_LENGTH_BYTES * 8U;
 const unsigned int P25_SYNC_LENGTH_SYMBOLS = P25_SYNC_LENGTH_BYTES * 4U;
 const unsigned int P25_SYNC_LENGTH_SAMPLES = P25_SYNC_LENGTH_SYMBOLS * P25_RADIO_SYMBOL_LENGTH;
 
-const unsigned int P25_NID_LENGTH_BITS     = 64U;
+const unsigned int P25_NID_LENGTH_BYTES    = 8U;
-const unsigned int P25_NID_LENGTH_SYMBOLS  = 32U;
+const unsigned int P25_NID_LENGTH_BITS     = P25_NID_LENGTH_BYTES * 8U;
-const unsigned int P25_NID_LENGTH_SAMPLESS = P25_NID_LENGTH_SYMBOLS * P25_RADIO_SYMBOL_LENGTH;
+const unsigned int P25_NID_LENGTH_SYMBOLS  = P25_NID_LENGTH_BYTES * 4U; 
+const unsigned int P25_NID_LENGTH_SAMPLES  = P25_NID_LENGTH_SYMBOLS * P25_RADIO_SYMBOL_LENGTH;
 
 const uint8_t P25_SYNC_BYTES[] = {0x55U, 0x75U, 0xF5U, 0xFFU, 0x77U, 0xFFU};
 const uint8_t P25_SYNC_BYTES_LENGTH  = 6U;
@@ -65,5 +77,13 @@ const int8_t P25_SYNC_SYMBOLS_VALUES[] = {+3, +3, +3, +3, +3, -3, +3, +3, -3, -3
 const uint32_t P25_SYNC_SYMBOLS      = 0x00FB30A0U;
 const uint32_t P25_SYNC_SYMBOLS_MASK = 0x00FFFFFFU;
 
+const uint8_t P25_DUID_HDU = 0x00U;             // Header Data Unit
+const uint8_t P25_DUID_TDU = 0x03U;             // Simple Terminator Data Unit
+const uint8_t P25_DUID_LDU1 = 0x05U;            // Logical Link Data Unit 1
+const uint8_t P25_DUID_TSDU = 0x07U;            // Trunking System Data Unit
+const uint8_t P25_DUID_LDU2 = 0x0AU;            // Logical Link Data Unit 2
+const uint8_t P25_DUID_PDU = 0x0CU;             // Packet Data Unit 
+const uint8_t P25_DUID_TDULC = 0x0FU;           // Terminator Data Unit with Link Control
+
 #endif
 

P25RX.cpp

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2018 by Bryan Biedenkapp <[email protected]>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -23,6 +24,8 @@
 
 const q15_t SCALING_FACTOR = 18750;      // Q15(0.57)
 
+const uint8_t CORRELATION_COUNTDOWN = 10U;//5U;
+
 const uint8_t MAX_SYNC_BIT_START_ERRS = 2U;
 const uint8_t MAX_SYNC_BIT_RUN_ERRS   = 4U;
 
@@ -60,7 +63,8 @@ m_threshold(),
 m_thresholdVal(0),
 m_averagePtr(NOAVEPTR),
 m_rssiAccum(0U),
-m_rssiCount(0U)
+m_rssiCount(0U),
+m_duid(0U)
 {
 }
 
@@ -84,6 +88,7 @@ void CP25RX::reset()
   m_countdown     = 0U;
   m_rssiAccum     = 0U;
   m_rssiCount     = 0U;
+  m_duid          = 0U;
 }
 
 void CP25RX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
@@ -113,8 +118,10 @@ void CP25RX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
     }
 
     m_dataPtr++;
-    if (m_dataPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
+    if (m_dataPtr >= P25_LDU_FRAME_LENGTH_SAMPLES) {
       m_dataPtr = 0U;
+      m_duid = 0U;
+    }
 
     m_bitPtr++;
     if (m_bitPtr >= P25_RADIO_SYMBOL_LENGTH)
@@ -136,7 +143,7 @@ void CP25RX::processNone(q15_t sample)
 
       m_averagePtr = NOAVEPTR;
 
-      m_countdown = 5U;
+      m_countdown = CORRELATION_COUNTDOWN;
     }
   }
 
@@ -169,16 +176,79 @@ void CP25RX::processHdr(q15_t sample)
   }
 
   if (m_dataPtr == m_maxSyncPtr) {
-    if (m_hdrSyncPtr != m_lduSyncPtr) {
+    uint16_t nidStartPtr = m_hdrStartPtr + P25_SYNC_LENGTH_SAMPLES;
-      calculateLevels(m_hdrStartPtr, P25_HDR_FRAME_LENGTH_SYMBOLS);
+    if (nidStartPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
+        nidStartPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
 
-      DEBUG4("P25RX: sync found in Hdr pos/centre/threshold", m_hdrSyncPtr, m_centreVal, m_thresholdVal);
+    uint8_t nid[2U];
+    samplesToBits(nidStartPtr, (2U * 4U), nid, 0U, m_centreVal, m_thresholdVal);
+    // DEBUG3("P25RX: nid (b0 - b1)", nid[0U], nid[1U]);
 
-      uint8_t frame[P25_HDR_FRAME_LENGTH_BYTES + 1U];
+    m_duid = nid[1U] & 0x0F;
-      samplesToBits(m_hdrStartPtr, P25_HDR_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
 
-      frame[0U] = 0x01U;
+    switch (m_duid) {
-      serial.writeP25Hdr(frame, P25_HDR_FRAME_LENGTH_BYTES + 1U);
+        case P25_DUID_HDU: {
+                calculateLevels(m_hdrStartPtr, P25_HDR_FRAME_LENGTH_SYMBOLS);
+
+                DEBUG4("P25RX: sync found in Hdr pos/centre/threshold", m_hdrSyncPtr, m_centreVal, m_thresholdVal);
+
+                uint8_t frame[P25_HDR_FRAME_LENGTH_BYTES + 1U];
+                samplesToBits(m_hdrStartPtr, P25_HDR_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
+
+                frame[0U] = 0x01U;
+                serial.writeP25Hdr(frame, P25_HDR_FRAME_LENGTH_BYTES + 1U);
+            }
+            break;
+		case P25_DUID_PDU: {
+				calculateLevels(m_hdrSyncPtr, P25_PDU_HDR_FRAME_LENGTH_SYMBOLS);
+
+				DEBUG4("P25RX: sync found in PDU pos/centre/threshold", m_hdrSyncPtr, m_centreVal, m_thresholdVal);
+
+				uint8_t frame[P25_PDU_HDR_FRAME_LENGTH_BYTES + 1U];
+				samplesToBits(m_hdrSyncPtr, P25_PDU_HDR_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
+
+				frame[0U] = 0x01U;
+				serial.writeP25Hdr(frame, P25_PDU_HDR_FRAME_LENGTH_BYTES + 1U);
+			}
+			break;
+		case P25_DUID_TSDU: {
+                calculateLevels(m_hdrStartPtr, P25_TSDU_FRAME_LENGTH_SYMBOLS);
+
+                DEBUG4("P25RX: sync found in TSDU pos/centre/threshold", m_hdrSyncPtr, m_centreVal, m_thresholdVal);
+
+                uint8_t frame[P25_TSDU_FRAME_LENGTH_BYTES + 1U];
+                samplesToBits(m_hdrStartPtr, P25_TSDU_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
+
+                frame[0U] = 0x01U;
+                serial.writeP25Hdr(frame, P25_TSDU_FRAME_LENGTH_BYTES + 1U);
+            }
+            break;
+        case P25_DUID_TDU: {
+                calculateLevels(m_hdrStartPtr, P25_TERM_FRAME_LENGTH_SYMBOLS);
+
+                DEBUG4("P25RX: sync found in TDU pos/centre/threshold", m_hdrSyncPtr, m_centreVal, m_thresholdVal);
+
+                uint8_t frame[P25_TERM_FRAME_LENGTH_BYTES + 1U];
+                samplesToBits(m_hdrStartPtr, P25_TERM_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
+
+                frame[0U] = 0x01U;
+                serial.writeP25Hdr(frame, P25_TERM_FRAME_LENGTH_BYTES + 1U);
+            }
+            break;
+        case P25_DUID_TDULC: {
+                calculateLevels(m_hdrStartPtr, P25_TERMLC_FRAME_LENGTH_SYMBOLS);
+
+                DEBUG4("P25RX: sync found in TDULC pos/centre/threshold", m_hdrSyncPtr, m_centreVal, m_thresholdVal);
+
+                uint8_t frame[P25_TERMLC_FRAME_LENGTH_BYTES + 1U];
+                samplesToBits(m_hdrStartPtr, P25_TERMLC_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
+
+                frame[0U] = 0x01U;
+                serial.writeP25Hdr(frame, P25_TERMLC_FRAME_LENGTH_BYTES + 1U);
+            }
+            break;
+        default:
+            break;
     }
 
     m_minSyncPtr = m_lduSyncPtr + P25_LDU_FRAME_LENGTH_SAMPLES - 1U;
@@ -238,6 +308,7 @@ void CP25RX::processLdu(q15_t sample)
       m_averagePtr = NOAVEPTR;
       m_countdown  = 0U;
       m_maxCorr    = 0;
+      m_duid       = 0U;
 		} else {
       frame[0U] = m_lostCount == (MAX_SYNC_FRAMES - 1U) ? 0x01U : 0x00U;
       writeRSSILdu(frame);

P25RX.h

@@ -1,5 +1,6 @@
 /*
  *   Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2018 by Bryan Biedenkapp <[email protected]>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -59,6 +60,7 @@ private:
   uint8_t     m_averagePtr;
   uint32_t    m_rssiAccum;
   uint16_t    m_rssiCount;
+  uint8_t     m_duid;
 
   void processNone(q15_t sample);
   void processHdr(q15_t sample);

P25TX.cpp

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016,2017,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2017 by Andy Uribe CA6JAU
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -43,7 +43,7 @@ const q15_t P25_LEVELD = -1260;
 const uint8_t P25_START_SYNC = 0x77U;
 
 CP25TX::CP25TX() :
-m_buffer(1500U),
+m_buffer(TX_BUFFER_LEN),
 m_modFilter(),
 m_lpFilter(),
 m_modState(),
@@ -51,7 +51,9 @@ m_lpState(),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
-m_txDelay(240U)       // 200ms
+m_txDelay(240U),      // 200ms
+m_txHang(6000U),      // 5s
+m_txCount(0U)
 {
   ::memset(m_modState, 0x00U, 16U * sizeof(q15_t));
   ::memset(m_lpState,  0x00U, 60U * sizeof(q15_t));
@@ -68,17 +70,16 @@ m_txDelay(240U)       // 200ms
 
 void CP25TX::process()
 {
-  if (m_buffer.getData() == 0U && m_poLen == 0U)
+  if (m_poLen == 0U && m_buffer.getData() > 0U) {
-    return;
-
-  if (m_poLen == 0U) {
     if (!m_tx) {
       for (uint16_t i = 0U; i < m_txDelay; i++)
         m_poBuffer[m_poLen++] = P25_START_SYNC;
     } else {
-      uint8_t length = m_buffer.get();
+      uint8_t length;
+      m_buffer.get(length);
       for (uint8_t i = 0U; i < length; i++) {
-        uint8_t c = m_buffer.get();
+        uint8_t c = 0U;
+        m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
     }
@@ -94,17 +95,32 @@ void CP25TX::process()
       writeByte(c);
 
       space -= 4U * P25_RADIO_SYMBOL_LENGTH;
-      
+       if (m_duplex)
+        m_txCount = m_txHang;
+
       if (m_poPtr >= m_poLen) {
         m_poPtr = 0U;
         m_poLen = 0U;
         return;
       }
     }
+  } else if (m_txCount > 0U) {
+    // Transmit silence until the hang timer has expired.
+    uint16_t space = io.getSpace();
+
+    while (space > (4U * P25_RADIO_SYMBOL_LENGTH)) {
+      writeSilence();
+
+      space -= 4U * P25_RADIO_SYMBOL_LENGTH;
+      m_txCount--;
+
+      if (m_txCount == 0U)
+        return;
+    }
   }
 }
 
-uint8_t CP25TX::writeData(const uint8_t* data, uint8_t length)
+uint8_t CP25TX::writeData(const uint8_t* data, uint16_t length)
 {
   if (length < (P25_TERM_FRAME_LENGTH_BYTES + 1U))
     return 4U;
@@ -152,6 +168,19 @@ void CP25TX::writeByte(uint8_t c)
   io.write(STATE_P25, outBuffer, P25_RADIO_SYMBOL_LENGTH * 4U);
 }
 
+void CP25TX::writeSilence()
+{
+  q15_t inBuffer[4U] = {0x00U, 0x00U, 0x00U, 0x00U};
+  q15_t intBuffer[P25_RADIO_SYMBOL_LENGTH * 4U];
+  q15_t outBuffer[P25_RADIO_SYMBOL_LENGTH * 4U];
+
+  ::arm_fir_interpolate_q15(&m_modFilter, inBuffer, intBuffer, 4U);
+
+  ::arm_fir_fast_q15(&m_lpFilter, intBuffer, outBuffer, P25_RADIO_SYMBOL_LENGTH * 4U);
+
+  io.write(STATE_P25, outBuffer, P25_RADIO_SYMBOL_LENGTH * 4U);
+}
+
 void CP25TX::setTXDelay(uint8_t delay)
 {
   m_txDelay = 600U + uint16_t(delay) * 12U;        // 500ms + tx delay
@@ -164,3 +193,8 @@ uint8_t CP25TX::getSpace() const
 {
   return m_buffer.getSpace() / P25_LDU_FRAME_LENGTH_BYTES;
 }
+
+void CP25TX::setParams(uint8_t txHang)
+{
+  m_txHang = txHang * 1200U;
+}

P25TX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016,2017,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -21,13 +21,13 @@
 
 #include "Config.h"
 
-#include "SerialRB.h"
+#include "RingBuffer.h"
 
 class CP25TX {
 public:
   CP25TX();
 
-  uint8_t writeData(const uint8_t* data, uint8_t length);
+  uint8_t writeData(const uint8_t* data, uint16_t length);
 
   void process();
 
@@ -35,8 +35,10 @@ public:
 
   uint8_t getSpace() const;
 
+  void setParams(uint8_t txHang);
+
 private:
-  CSerialRB                        m_buffer;
+  CRingBuffer<uint8_t>                        m_buffer;
   arm_fir_interpolate_instance_q15 m_modFilter;
   arm_fir_instance_q15             m_lpFilter;
   q15_t                            m_modState[16U];    // blockSize + phaseLength - 1, 4 + 9 - 1 plus some spare
@@ -45,9 +47,11 @@ private:
   uint16_t                         m_poLen;
   uint16_t                         m_poPtr;
   uint16_t                         m_txDelay;
+  uint32_t                         m_txHang;
+  uint32_t                         m_txCount;
 
   void writeByte(uint8_t c);
+  void writeSilence();
 };
 
 #endif
-

POCSAGTX.cpp

@@ -0,0 +1,149 @@
+/*
+ *   Copyright (C) 2009-2018,2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "POCSAGTX.h"
+
+const uint16_t POCSAG_FRAME_LENGTH_BYTES = 17U * sizeof(uint32_t);
+
+const uint16_t POCSAG_PREAMBLE_LENGTH_BYTES = 18U * sizeof(uint32_t);
+
+const uint16_t POCSAG_RADIO_SYMBOL_LENGTH = 20U;
+
+const q15_t POCSAG_LEVEL1[] = { 1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700};
+const q15_t POCSAG_LEVEL0[] = {-1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700, -1700};
+
+static q15_t SHAPING_FILTER[] = {5461, 5461, 5461, 5461, 5461, 5461};
+const uint16_t SHAPING_FILTER_LEN = 6U;
+
+const uint8_t POCSAG_SYNC = 0xAAU;
+
+CPOCSAGTX::CPOCSAGTX() :
+m_buffer(4000U),
+m_modFilter(),
+m_modState(),
+m_poBuffer(),
+m_poLen(0U),
+m_poPtr(0U),
+m_txDelay(POCSAG_PREAMBLE_LENGTH_BYTES)
+{
+  ::memset(m_modState, 0x00U, 170U * sizeof(q15_t));
+
+  m_modFilter.numTaps = SHAPING_FILTER_LEN;
+  m_modFilter.pState  = m_modState;
+  m_modFilter.pCoeffs = SHAPING_FILTER;
+}
+
+void CPOCSAGTX::process()
+{
+  if (m_buffer.getData() == 0U && m_poLen == 0U)
+    return;
+
+  if (m_poLen == 0U) {
+    if (!m_tx) {
+      for (uint16_t i = 0U; i < m_txDelay; i++)
+        m_poBuffer[m_poLen++] = POCSAG_SYNC;
+    } else {
+      for (uint8_t i = 0U; i < POCSAG_FRAME_LENGTH_BYTES; i++) {
+        uint8_t c = 0U;
+        m_buffer.get(c);
+        m_poBuffer[m_poLen++] = c;
+      }
+    }
+
+    m_poPtr = 0U;
+  }
+
+  if (m_poLen > 0U) {
+    uint16_t space = io.getSpace();
+    
+    while (space > (8U * POCSAG_RADIO_SYMBOL_LENGTH)) {
+      uint8_t c = m_poBuffer[m_poPtr++];
+      writeByte(c);
+
+      space -= 8U * POCSAG_RADIO_SYMBOL_LENGTH;
+      
+      if (m_poPtr >= m_poLen) {
+        m_poPtr = 0U;
+        m_poLen = 0U;
+        return;
+      }
+    }
+  }
+}
+
+bool CPOCSAGTX::busy()
+{
+  if (m_poLen > 0U || m_buffer.getData() > 0U)
+    return true;
+  else
+    return false;
+}
+
+uint8_t CPOCSAGTX::writeData(const uint8_t* data, uint16_t length)
+{
+  if (length != POCSAG_FRAME_LENGTH_BYTES)
+    return 4U;
+
+  uint16_t space = m_buffer.getSpace();
+  if (space < POCSAG_FRAME_LENGTH_BYTES)
+    return 5U;
+
+  for (uint8_t i = 0U; i < POCSAG_FRAME_LENGTH_BYTES; i++)
+    m_buffer.put(data[i]);
+
+  return 0U;
+}
+
+void CPOCSAGTX::writeByte(uint8_t c)
+{
+  q15_t inBuffer[POCSAG_RADIO_SYMBOL_LENGTH * 8U];
+  q15_t outBuffer[POCSAG_RADIO_SYMBOL_LENGTH * 8U];
+
+  const uint8_t MASK = 0x80U;
+
+  uint8_t n = 0U;
+  for (uint8_t i = 0U; i < 8U; i++, c <<= 1, n += POCSAG_RADIO_SYMBOL_LENGTH) {
+    switch (c & MASK) {
+      case 0x80U:
+        ::memcpy(inBuffer + n, POCSAG_LEVEL1, POCSAG_RADIO_SYMBOL_LENGTH * sizeof(q15_t));
+        break;
+      default:
+        ::memcpy(inBuffer + n, POCSAG_LEVEL0, POCSAG_RADIO_SYMBOL_LENGTH * sizeof(q15_t));
+        break;
+    }
+  }
+
+  ::arm_fir_fast_q15(&m_modFilter, inBuffer, outBuffer, POCSAG_RADIO_SYMBOL_LENGTH * 8U);
+
+  io.write(STATE_POCSAG, outBuffer, POCSAG_RADIO_SYMBOL_LENGTH * 8U);
+}
+
+void CPOCSAGTX::setTXDelay(uint8_t delay)
+{
+  m_txDelay = POCSAG_PREAMBLE_LENGTH_BYTES + (delay * 3U) / 2U;
+
+  if (m_txDelay > 150U)
+    m_txDelay = 150U;
+}
+
+uint8_t CPOCSAGTX::getSpace() const
+{
+  return m_buffer.getSpace() / POCSAG_FRAME_LENGTH_BYTES;
+}

POCSAGTX.h

@@ -0,0 +1,53 @@
+/*
+ *   Copyright (C) 2015-2020 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(POCSAGTX_H)
+#define  POCSAGTX_H
+
+#include "Config.h"
+
+#include "RingBuffer.h"
+
+class CPOCSAGTX {
+public:
+  CPOCSAGTX();
+
+  uint8_t writeData(const uint8_t* data, uint16_t length);
+
+  void writeByte(uint8_t c);
+
+  void process();
+
+  void setTXDelay(uint8_t delay);
+
+  uint8_t getSpace() const;
+
+  bool busy();
+
+private:
+  CRingBuffer<uint8_t>            m_buffer;
+  arm_fir_instance_q15 m_modFilter;
+  q15_t                m_modState[170U];     // NoTaps + BlockSize - 1, 6 + 160 - 1 plus some spare
+  uint8_t              m_poBuffer[200U];
+  uint16_t             m_poLen;
+  uint16_t             m_poPtr;
+  uint16_t             m_txDelay;
+};
+
+#endif
+

README.md

@@ -1,7 +1,17 @@
-This is the source code of the MMDVM firmware that supports D-Star, DMR, System Fusion and P25 modes.
+This is the source code of the MMDVM firmware that supports D-Star, DMR,
+System Fusion, P25, NXDN, POCSAG, and FM modes.
 
-It runs on the Arduino Due, the ST-Micro STM32F407-DISCO and STM32F446-NUCLEO, as well as the Teensy 3.1/3.2/3.5/3.6. What these platforms have in common is the use of an ARM Cortex-M3 or M4 processor with a clock speed greater than 70 MHz, and access to at least one analogue to digital converter and one digital to analogue converter. A Cortex-M7 processor is also probably adequate.
+It runs on the Arduino Due, the ST-Micro STM32F1xxx, STM32F4xxx and STM32F7xxx
+processors, as well as the Teensy 3.1/3.2/3.5/3.6. What these platforms have in
+common is the use of an ARM Cortex-M3, M4, or M7 processors with a clock speed
+greater than 70 MHz, and access to at least one analogue to digital converter
+and one digital to analogue converter.
 
-In order to build this software for the Arduino Due, you will need to edit a file within the Arduino GUI and that is detailed in the BUILD.txt file. The STM32 support is being supplied via the Coocox IDE with ARM GCC. The Teensy support is via the latest beta of Teensyduino.
+In order to build this software for the Arduino Due, you will need to edit a
+file within the Arduino GUI and that is detailed in the BUILD.txt file. The
+STM32 support is being supplied via the ARM GCC compiler. The Teensy support
+uses Teensyduino.
 
-This software is licenced under the GPL v2 and is intended for amateur and educational use only. Use of this software for commercial purposes is strictly forbidden.
+This software is licenced under the GPL v2 and is intended for amateur and
+educational use only. Use of this software for commercial purposes is strictly
+forbidden.

RSSIRB.cpp

@@ -1,104 +0,0 @@
-/*
-TX fifo control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#include "RSSIRB.h"
-
-CRSSIRB::CRSSIRB(uint16_t length) :
-m_length(length),
-m_rssi(NULL),
-m_head(0U),
-m_tail(0U),
-m_full(false),
-m_overflow(false)
-{
-  m_rssi = new uint16_t[length];
-}
-
-uint16_t CRSSIRB::getSpace() const
-{
-  uint16_t n = 0U;
-
-  if (m_tail == m_head)
-    n = m_full ? 0U : m_length;
-  else if (m_tail < m_head)
-    n = m_length - m_head + m_tail;
-  else
-    n = m_tail - m_head;
-
-  if (n > m_length)
-    n = 0U;
-
-  return n;
-}
-
-uint16_t CRSSIRB::getData() const
-{
-  if (m_tail == m_head)
-    return m_full ? m_length : 0U;
-  else if (m_tail < m_head)
-    return m_head - m_tail;
-  else
-    return m_length - m_tail + m_head;
-}
-
-bool CRSSIRB::put(uint16_t rssi)
-{
-  if (m_full) {
-    m_overflow = true;
-    return false;
-  }
-
-  m_rssi[m_head] = rssi;
-
-  m_head++;
-  if (m_head >= m_length)
-    m_head = 0U;
-
-  if (m_head == m_tail)
-    m_full = true;
-
-  return true;
-}
-
-bool CRSSIRB::get(uint16_t& rssi)
-{
-  if (m_head == m_tail && !m_full)
-    return false;
-
-  rssi  = m_rssi[m_tail];
-
-  m_full = false;
-
-  m_tail++;
-  if (m_tail >= m_length)
-    m_tail = 0U;
-
-  return true;
-}
-
-bool CRSSIRB::hasOverflowed()
-{
-  bool overflow = m_overflow;
-
-  m_overflow = false;
-
-  return overflow;
-}
-

RSSIRB.h

@@ -1,59 +0,0 @@
-/*
-Serial fifo control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#if !defined(RSSIRB_H)
-#define  RSSIRB_H
-
-#if defined(STM32F4XX)
-#include "stm32f4xx.h"
-#elif defined(STM32F7XX)
-#include "stm32f7xx.h"
-#elif defined(STM32F105xC)
-#include "stm32f1xx.h"
-#include <cstddef>
-#else
-#include <Arduino.h>
-#endif
-
-class CRSSIRB {
-public:
-  CRSSIRB(uint16_t length);
-  
-  uint16_t getSpace() const;
-  
-  uint16_t getData() const;
-
-  bool put(uint16_t rssi);
-
-  bool get(uint16_t& rssi);
-
-  bool hasOverflowed();
-
-private:
-  uint16_t           m_length;
-  volatile uint16_t* m_rssi;
-  volatile uint16_t  m_head;
-  volatile uint16_t  m_tail;
-  volatile bool      m_full;
-  bool               m_overflow;
-};
-
-#endif
-

RingBuffer.h

@@ -0,0 +1,77 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(RINGBUFFER_H)
+#define  RINGBUFFER_H
+
+#if defined(STM32F4XX)
+#include "stm32f4xx.h"
+#elif defined(STM32F7XX)
+#include "stm32f7xx.h"
+#elif defined(STM32F105xC)
+#include "stm32f1xx.h"
+#include <cstddef>
+#else
+#include <Arduino.h>
+#undef PI
+#endif
+
+#if defined(__SAM3X8E__) || defined(STM32F105xC)
+#define  ARM_MATH_CM3
+#elif defined(STM32F7XX)
+#define  ARM_MATH_CM7
+#elif defined(STM32F4XX) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
+#define  ARM_MATH_CM4
+#else
+#error "Unknown processor type"
+#endif
+
+#include <arm_math.h>
+
+template <typename TDATATYPE>
+class CRingBuffer {
+public:
+  CRingBuffer(uint16_t length = 370U);
+  
+  uint16_t getSpace() const;
+  
+  uint16_t getData() const;
+
+  bool put(TDATATYPE item) volatile;
+
+  bool get(TDATATYPE& item) volatile;
+
+  TDATATYPE peek() const;
+
+  bool hasOverflowed();
+
+  void reset();
+
+private:
+  uint16_t              m_length;
+  TDATATYPE*            m_buffer;
+  volatile uint16_t     m_head;
+  volatile uint16_t     m_tail;
+  volatile bool         m_full;
+  bool                  m_overflow;
+};
+
+#include "RingBuffer.impl.h"
+
+#endif

RingBuffer.impl.h

@@ -0,0 +1,114 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2020 by Geoffrey Merck F4FXL - KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "RingBuffer.h"
+
+template <typename TDATATYPE> CRingBuffer<TDATATYPE>::CRingBuffer(uint16_t length) :
+m_length(length),
+m_head(0U),
+m_tail(0U),
+m_full(false),
+m_overflow(false)
+{
+  m_buffer = new TDATATYPE[length];
+}
+
+template <typename TDATATYPE> uint16_t CRingBuffer<TDATATYPE>::getSpace() const
+{
+  uint16_t n = 0U;
+
+  if (m_tail == m_head)
+    n = m_full ? 0U : m_length;
+  else if (m_tail < m_head)
+    n = m_length - m_head + m_tail;
+  else
+    n = m_tail - m_head;
+
+  if (n > m_length)
+    n = 0U;
+
+  return n;
+}
+
+template <typename TDATATYPE> uint16_t CRingBuffer<TDATATYPE>::getData() const
+{
+  if (m_tail == m_head)
+    return m_full ? m_length : 0U;
+  else if (m_tail < m_head)
+    return m_head - m_tail;
+  else
+    return m_length - m_tail + m_head;
+}
+
+template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::put(TDATATYPE item) volatile
+{
+  if (m_full) {
+    m_overflow = true;
+    return false;
+  }
+
+  m_buffer[m_head] = item;
+
+  m_head++;
+  if (m_head >= m_length)
+    m_head = 0U;
+
+  if (m_head == m_tail)
+    m_full = true;
+
+  return true;
+}
+
+template <typename TDATATYPE> TDATATYPE CRingBuffer<TDATATYPE>::peek() const
+{
+  return m_buffer[m_tail];
+}
+
+template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::get(TDATATYPE& item) volatile
+{
+  if (m_head == m_tail && !m_full)
+    return false;
+
+  item = m_buffer[m_tail];
+
+  m_full = false;
+
+  m_tail++;
+  if (m_tail >= m_length)
+    m_tail = 0U;
+
+  return true;
+}
+
+template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::hasOverflowed()
+{
+  bool overflow = m_overflow;
+
+  m_overflow = false;
+
+  return overflow;
+}
+
+template <typename TDATATYPE> void CRingBuffer<TDATATYPE>::reset()
+{
+  m_head = 0U;
+  m_tail = 0U;
+  m_full     = false;
+  m_overflow = false;
+}

STMUART.cpp

@@ -0,0 +1,100 @@
+/*
+ *   Copyright (c) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (c) 2020 by Geoffrey Merck F4FXL - KC3FRA   
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if defined(STM32F4XX) || defined(STM32F7XX)
+
+#include "STMUART.h"
+
+CSTMUART::CSTMUART() :
+m_usart(NULL)
+{
+
+}
+
+void CSTMUART::init(USART_TypeDef* usart)
+{
+  m_usart = usart;
+}
+
+void CSTMUART::write(const uint8_t * data, uint16_t length)
+{
+  if(length == 0U || m_usart == NULL)
+    return;
+
+
+  m_txFifo.put(data[0]);
+  USART_ITConfig(m_usart, USART_IT_TXE, ENABLE);//switch TX IRQ is on
+
+  for(uint16_t i = 1U; i < length; i++) {
+    m_txFifo.put(data[i]);
+  }
+
+  USART_ITConfig(m_usart, USART_IT_TXE, ENABLE);//make sure TX IRQ is on
+}
+
+uint8_t CSTMUART::read()
+{
+  return m_rxFifo.get();
+}
+
+void CSTMUART::handleIRQ()
+{
+  if(m_usart == NULL)
+    return;
+
+  if (USART_GetITStatus(m_usart, USART_IT_RXNE)) {
+    if(!m_rxFifo.isFull())
+      m_rxFifo.put((uint8_t) USART_ReceiveData(m_usart));
+    USART_ClearITPendingBit(USART1, USART_IT_RXNE);
+  }
+
+  if (USART_GetITStatus(m_usart, USART_IT_TXE)) {
+    if(!m_txFifo.isEmpty())
+      USART_SendData(m_usart, m_txFifo.get());
+
+    USART_ClearITPendingBit(m_usart, USART_IT_TXE);
+
+    if (m_txFifo.isEmpty()) // if there's no more data to transmit then turn off TX interrupts
+      USART_ITConfig(m_usart, USART_IT_TXE, DISABLE);
+  }
+}
+
+  // Flushes the transmit shift register
+// warning: this call is blocking
+void CSTMUART::flush()
+{
+  if(m_usart == NULL)
+    return;
+
+   // wait until the TXE shows the shift register is empty
+   while (USART_GetITStatus(m_usart, USART_FLAG_TXE))
+      ;
+}
+
+uint16_t CSTMUART::available()
+{
+  return m_rxFifo.isEmpty() ? 0U : 1U;
+}
+
+uint16_t CSTMUART::availableForWrite()
+{
+  return m_txFifo.isFull() ? 0U : 1U;
+}
+
+#endif

STMUART.h

@@ -0,0 +1,91 @@
+/*
+ *   Copyright (c) 2020 by Jonathan Naylor G4KLX
+ *   Copyright (c) 2020 by Geoffrey Merck F4FXL - KC3FRA   
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if defined(STM32F4XX) || defined(STM32F7XX)
+#if !defined(STMUART_H)
+#define STMUART_H
+
+#if defined(STM32F4XX)
+#include "stm32f4xx.h"
+#elif defined(STM32F7XX)
+#include "stm32f7xx.h"
+#endif
+
+const uint16_t BUFFER_SIZE = 2048U; //needs to be a power of 2 !
+const uint16_t BUFFER_MASK = BUFFER_SIZE - 1;
+
+class CSTMUARTFIFO {
+public:
+  CSTMUARTFIFO() :
+  m_head(0U),
+  m_tail(0U)
+  {
+  }
+
+  void put(uint8_t data)
+  {
+    m_buffer[BUFFER_MASK & (m_head++)] = data;
+  }
+
+  uint8_t get()
+  {
+    return m_buffer[BUFFER_MASK & (m_tail++)];
+  }
+
+  void reset()
+  {
+    m_tail = 0U;
+    m_head = 0U;
+  }
+
+  bool isEmpty()
+  {
+    return m_tail == m_head;
+  }
+
+  bool isFull()
+  {
+    return ((m_head + 1U) & BUFFER_MASK) == (m_tail & BUFFER_MASK);
+  }
+
+private:
+  volatile uint8_t  m_buffer[BUFFER_SIZE];
+  volatile uint16_t m_head;
+  volatile uint16_t m_tail;
+};
+
+class CSTMUART {
+public:
+  CSTMUART();
+  void init(USART_TypeDef* usart);
+  void write(const uint8_t * data, uint16_t length);
+  uint8_t read();
+  void handleIRQ();
+  void flush();
+  uint16_t available();
+  uint16_t availableForWrite();
+
+private:
+  USART_TypeDef * m_usart;
+  CSTMUARTFIFO    m_rxFifo;
+  CSTMUARTFIFO    m_txFifo;
+};
+
+#endif
+#endif

SampleRB.cpp

@@ -1,108 +0,0 @@
-/*
-TX fifo control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#include "SampleRB.h"
-
-CSampleRB::CSampleRB(uint16_t length) :
-m_length(length),
-m_samples(NULL),
-m_control(NULL),
-m_head(0U),
-m_tail(0U),
-m_full(false),
-m_overflow(false)
-{
-  m_samples = new uint16_t[length];
-  m_control = new uint8_t[length];
-}
-
-uint16_t CSampleRB::getSpace() const
-{
-  uint16_t n = 0U;
-
-  if (m_tail == m_head)
-    n = m_full ? 0U : m_length;
-  else if (m_tail < m_head)
-    n = m_length - m_head + m_tail;
-  else
-    n = m_tail - m_head;
-
-  if (n > m_length)
-    n = 0U;
-
-  return n;
-}
-
-uint16_t CSampleRB::getData() const
-{
-  if (m_tail == m_head)
-    return m_full ? m_length : 0U;
-  else if (m_tail < m_head)
-    return m_head - m_tail;
-  else
-    return m_length - m_tail + m_head;
-}
-
-bool CSampleRB::put(uint16_t sample, uint8_t control)
-{
-  if (m_full) {
-    m_overflow = true;
-    return false;
-  }
-
-  m_samples[m_head] = sample;
-  m_control[m_head] = control;
-
-  m_head++;
-  if (m_head >= m_length)
-    m_head = 0U;
-
-  if (m_head == m_tail)
-    m_full = true;
-
-  return true;
-}
-
-bool CSampleRB::get(uint16_t& sample, uint8_t& control)
-{
-  if (m_head == m_tail && !m_full)
-    return false;
-
-  sample  = m_samples[m_tail];
-  control = m_control[m_tail];
-
-  m_full = false;
-
-  m_tail++;
-  if (m_tail >= m_length)
-    m_tail = 0U;
-
-  return true;
-}
-
-bool CSampleRB::hasOverflowed()
-{
-  bool overflow = m_overflow;
-
-  m_overflow = false;
-
-  return overflow;
-}
-

SampleRB.h

@@ -1,60 +0,0 @@
-/*
-Serial fifo control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#if !defined(SAMPLERB_H)
-#define  SAMPLERB_H
-
-#if defined(STM32F4XX)
-#include "stm32f4xx.h"
-#elif defined(STM32F7XX)
-#include "stm32f7xx.h"
-#elif defined(STM32F105xC)
-#include "stm32f1xx.h"
-#include <cstddef>
-#else
-#include <Arduino.h>
-#endif
-
-class CSampleRB {
-public:
-  CSampleRB(uint16_t length);
-  
-  uint16_t getSpace() const;
-  
-  uint16_t getData() const;
-
-  bool put(uint16_t sample, uint8_t control);
-
-  bool get(uint16_t& sample, uint8_t& control);
-
-  bool hasOverflowed();
-
-private:
-  uint16_t           m_length;
-  volatile uint16_t* m_samples;
-  volatile uint8_t*  m_control;
-  volatile uint16_t  m_head;
-  volatile uint16_t  m_tail;
-  volatile bool      m_full;
-  bool               m_overflow;
-};
-
-#endif
-

SerialArduino.cpp

@@ -21,7 +21,10 @@
 
 #include "SerialPort.h"
 
-#if defined(__SAM3X8E__) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
+#if defined(VK6MST_TEENSY_PI3_SHIELD_I2C)
+//it will load I2CTeensy.cpp
+
+#elif defined(__SAM3X8E__) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
 
 void CSerialPort::beginInt(uint8_t n, int speed)
 {

SerialPort.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -21,7 +21,11 @@
 
 #include "Config.h"
 #include "Globals.h"
-#include "SerialRB.h"
+#include "RingBuffer.h"
+
+#if !defined(SERIAL_SPEED)
+#define SERIAL_SPEED 115200
+#endif
 
 
 class CSerialPort {
@@ -50,6 +54,12 @@ public:
   void writeNXDNData(const uint8_t* data, uint8_t length);
   void writeNXDNLost();
 
+  void writeAX25Data(const uint8_t* data, uint16_t length);
+
+  void writeFMData(const uint8_t* data, uint16_t length);
+  void writeFMStatus(uint8_t status);
+  void writeFMEOT();
+
   void writeCalData(const uint8_t* data, uint8_t length);
   void writeRSSIData(const uint8_t* data, uint8_t length);
 
@@ -60,19 +70,24 @@ public:
   void writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n3, int16_t n4);
 
 private:
-  uint8_t   m_buffer[256U];
+  uint8_t   m_buffer[512U];
-  uint8_t   m_ptr;
+  uint16_t  m_ptr;
-  uint8_t   m_len;
+  uint16_t  m_len;
   bool      m_debug;
-  CSerialRB m_repeat;
+  CRingBuffer<uint8_t> m_repeat;
 
   void    sendACK();
   void    sendNAK(uint8_t err);
   void    getStatus();
   void    getVersion();
-  uint8_t setConfig(const uint8_t* data, uint8_t length);
+  uint8_t setConfig(const uint8_t* data, uint16_t length);
-  uint8_t setMode(const uint8_t* data, uint8_t length);
+  uint8_t setMode(const uint8_t* data, uint16_t length);
   void    setMode(MMDVM_STATE modemState);
+  uint8_t setFMParams1(const uint8_t* data, uint16_t length);
+  uint8_t setFMParams2(const uint8_t* data, uint16_t length);
+  uint8_t setFMParams3(const uint8_t* data, uint16_t length);
+  uint8_t setFMParams4(const uint8_t* data, uint16_t length);
+  void    processMessage(const uint8_t* data, uint16_t length);
 
   // Hardware versions
   void    beginInt(uint8_t n, int speed);
@@ -83,4 +98,3 @@ private:
 };
 
 #endif
-

SerialRB.cpp

@@ -1,101 +0,0 @@
-/*
-Serial RB control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#include "SerialRB.h"
-
-CSerialRB::CSerialRB(uint16_t length) :
-m_length(length),
-m_buffer(NULL),
-m_head(0U),
-m_tail(0U),
-m_full(false)
-{
-  m_buffer = new uint8_t[length];
-}
-
-void CSerialRB::reset()
-{
-  m_head = 0U;
-  m_tail = 0U;
-  m_full = false;
-}
-
-uint16_t CSerialRB::getSpace() const
-{
-  uint16_t n = 0U;
-
-  if (m_tail == m_head)
-    n = m_full ? 0U : m_length;
-  else if (m_tail < m_head)
-    n = m_length - m_head + m_tail;
-  else
-    n = m_tail - m_head;
-
-  if (n > m_length)
-    n = 0U;
-
-  return n;
-}
-
-uint16_t CSerialRB::getData() const
-{
-  if (m_tail == m_head)
-    return m_full ? m_length : 0U;
-  else if (m_tail < m_head)
-    return m_head - m_tail;
-  else
-    return m_length - m_tail + m_head;
-}
-
-bool CSerialRB::put(uint8_t c)
-{
-  if (m_full)
-    return false;
-
-  m_buffer[m_head] = c;
-
-  m_head++;
-  if (m_head >= m_length)
-    m_head = 0U;
-
-  if (m_head == m_tail)
-    m_full = true;
-
-  return true;
-}
-
-uint8_t CSerialRB::peek() const
-{
-  return m_buffer[m_tail];
-}
-
-uint8_t CSerialRB::get()
-{
-  uint8_t value = m_buffer[m_tail];
-
-  m_full = false;
-
-  m_tail++;
-  if (m_tail >= m_length)
-    m_tail = 0U;
-
-  return value;
-}
-

SerialRB.h

@@ -1,62 +0,0 @@
-/*
-Serial fifo control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#if !defined(SERIALRB_H)
-#define  SERIALRB_H
-
-#if defined(STM32F4XX)
-#include "stm32f4xx.h"
-#elif defined(STM32F7XX)
-#include "stm32f7xx.h"
-#elif defined(STM32F105xC)
-#include "stm32f1xx.h"
-#include <cstddef>
-#else
-#include <Arduino.h>
-#endif
-
-const uint16_t SERIAL_RINGBUFFER_SIZE = 370U;
-
-class CSerialRB {
-public:
-  CSerialRB(uint16_t length = SERIAL_RINGBUFFER_SIZE);
-
-  uint16_t getSpace() const;
-
-  uint16_t getData() const;
-
-  void reset();
-
-  bool put(uint8_t c);
-
-  uint8_t peek() const;
-
-  uint8_t get();
-
-private:
-  uint16_t          m_length;
-  volatile uint8_t* m_buffer;
-  volatile uint16_t m_head;
-  volatile uint16_t m_tail;
-  volatile bool     m_full;
-};
-
-#endif
-

SerialSTM.cpp

@@ -1,6 +1,6 @@
 /*
  *   Copyright (C) 2016 by Jim McLaughlin KI6ZUM
- *   Copyright (C) 2016, 2017 by Andy Uribe CA6JAU
+ *   Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
  *   Copyright (c) 2017 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -27,21 +27,19 @@
 Pin definitions:
 
 - Host communication:
-USART1 - TXD PA9  - RXD PA10 (MMDVM-Pi board, MMDVM-Pi F722 board, MMDVM-F4M board)
+USART1 - TXD PA9  - RXD PA10 (MMDVM-Pi board, MMDVM-Pi F722 board, MMDVM-F4M board, STM32F722-F7M board, STM32F4-DVM board)
-USART2 - TXD PA2  - RXD PA3  (Nucleo64 F446RE board, Morpho or Arduino header)
+USART2 - TXD PA2  - RXD PA3  (Nucleo64 F446RE board, Morpho or Arduino header, MMDVM_RPT_Hat BG4TGO/BG5HHP board)
 USART3 - TXD PC10 - RXD PC11 (Discovery board)
 USART3 - TXD PD8  - RXD PD9  (Nucleo144 F767ZI board)
 
 - Serial repeater:
 USART1 - TXD PA9  - RXD PA10 (Nucleo with Arduino header)
-UART5  - TXD PC12 - RXD PD2 (Discovery, MMDVM-Pi, MMDVM-Pi F722 board, MMDVM-F4M board, Nucleo64 with Morpho header and Nucleo144 F767ZI)
+UART5  - TXD PC12 - RXD PD2 (Discovery, MMDVM-Pi, MMDVM-Pi F722 board, MMDVM-F4M board, STM32F722-F7M board, STM32F4-DVM board, Nucleo64 with Morpho header and Nucleo144 F767ZI, MMDVM_RPT_Hat BG4TGO/BG5HHP board)
 */
 
 #if defined(STM32F4XX) || defined(STM32F7XX)
 
-#define TX_SERIAL_FIFO_SIZE 512U
+#include "STMUART.h"
-#define RX_SERIAL_FIFO_SIZE 512U
-
 extern "C" {
    void USART1_IRQHandler();
    void USART2_IRQHandler();
@@ -50,113 +48,14 @@ extern "C" {
 }
 
 /* ************* USART1 ***************** */
-#if defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || (defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER))
+#if defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_F7M) || defined(STM32F722_PI) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM) || (defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)) || defined(DRCC_DVM) || defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
 
-volatile uint8_t  TXSerialfifo1[TX_SERIAL_FIFO_SIZE];
-volatile uint8_t  RXSerialfifo1[RX_SERIAL_FIFO_SIZE];
-volatile uint16_t TXSerialfifohead1, TXSerialfifotail1;
-volatile uint16_t RXSerialfifohead1, RXSerialfifotail1;
 
-// Init queues
+static CSTMUART m_USART1;
-void TXSerialfifoinit1()
-{
-   TXSerialfifohead1 = 0U;
-   TXSerialfifotail1 = 0U;
-}
-
-void RXSerialfifoinit1()
-{
-   RXSerialfifohead1 = 0U;
-   RXSerialfifotail1 = 0U;
-}
-
-// How full is queue
-// TODO decide if how full or how empty is preferred info to return
-uint16_t TXSerialfifolevel1()
-{
-   uint32_t tail = TXSerialfifotail1;
-   uint32_t head = TXSerialfifohead1;
-
-   if (tail > head)
-      return TX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-uint16_t RXSerialfifolevel1()
-{
-   uint32_t tail = RXSerialfifotail1;
-   uint32_t head = RXSerialfifohead1;
-
-   if (tail > head)
-      return RX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-// Flushes the transmit shift register
-// warning: this call is blocking
-void TXSerialFlush1()
-{
-   // wait until the TXE shows the shift register is empty
-   while (USART_GetITStatus(USART1, USART_FLAG_TXE))
-      ;
-}
-
-uint8_t TXSerialfifoput1(uint8_t next)
-{
-   if (TXSerialfifolevel1() < TX_SERIAL_FIFO_SIZE) {
-      TXSerialfifo1[TXSerialfifohead1] = next;
-
-      TXSerialfifohead1++;
-      if (TXSerialfifohead1 >= TX_SERIAL_FIFO_SIZE)
-         TXSerialfifohead1 = 0U;
-
-      // make sure transmit interrupts are enabled as long as there is data to send
-      USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
-      return 1U;
-   } else {
-      return 0U; // signal an overflow occurred by returning a zero count
-   }
-}
 
 void USART1_IRQHandler()
 {
-   uint8_t c;
+  m_USART1.handleIRQ();
-
-   if (USART_GetITStatus(USART1, USART_IT_RXNE)) {
-      c = (uint8_t) USART_ReceiveData(USART1);
-
-      if (RXSerialfifolevel1() < RX_SERIAL_FIFO_SIZE) {
-         RXSerialfifo1[RXSerialfifohead1] = c;
-
-         RXSerialfifohead1++;
-         if (RXSerialfifohead1 >= RX_SERIAL_FIFO_SIZE)
-            RXSerialfifohead1 = 0U;
-      } else {
-         // TODO - do something if rx fifo is full?
-      }
-
-      USART_ClearITPendingBit(USART1, USART_IT_RXNE);
-   }
-
-   if (USART_GetITStatus(USART1, USART_IT_TXE)) {
-      c = 0U;
-
-      if (TXSerialfifohead1 != TXSerialfifotail1) { // if the fifo is not empty
-         c = TXSerialfifo1[TXSerialfifotail1];
-
-         TXSerialfifotail1++;
-         if (TXSerialfifotail1 >= TX_SERIAL_FIFO_SIZE)
-            TXSerialfifotail1 = 0U;
-
-         USART_SendData(USART1, c);
-      } else { // if there's no more data to transmit then turn off TX interrupts
-         USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
-      }
-
-      USART_ClearITPendingBit(USART1, USART_IT_TXE);
-   }
 }
 
 void InitUSART1(int speed)
@@ -201,153 +100,20 @@ void InitUSART1(int speed)
 
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
 
-   // initialize the fifos
+   m_USART1.init(USART1);
-   TXSerialfifoinit1();
-   RXSerialfifoinit1();
-}
-
-uint8_t AvailUSART1()
-{
-   if (RXSerialfifolevel1() > 0U)
-      return 1U;
-   else
-      return 0U;
-}
-
-int AvailForWriteUSART1()
-{
-   return TX_SERIAL_FIFO_SIZE - TXSerialfifolevel1();
-}
-
-uint8_t ReadUSART1()
-{
-   uint8_t data_c = RXSerialfifo1[RXSerialfifotail1];
-
-   RXSerialfifotail1++;
-   if (RXSerialfifotail1 >= RX_SERIAL_FIFO_SIZE)
-      RXSerialfifotail1 = 0U;
-
-   return data_c;
-}
-
-void WriteUSART1(const uint8_t* data, uint16_t length)
-{
-   for (uint16_t i = 0U; i < length; i++)
-      TXSerialfifoput1(data[i]);
-
-   USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
 }
 
 #endif
 
 /* ************* USART2 ***************** */
-#if defined(STM32F4_NUCLEO)
+#if defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO) || defined(DRCC_DVM)
 
-volatile uint8_t  TXSerialfifo2[TX_SERIAL_FIFO_SIZE];
+static CSTMUART m_USART2;
-volatile uint8_t  RXSerialfifo2[RX_SERIAL_FIFO_SIZE];
-volatile uint16_t TXSerialfifohead2, TXSerialfifotail2;
-volatile uint16_t RXSerialfifohead2, RXSerialfifotail2;
 
-// Init queues
-void TXSerialfifoinit2()
-{
-   TXSerialfifohead2 = 0U;
-   TXSerialfifotail2 = 0U;
-}
-
-void RXSerialfifoinit2()
-{
-   RXSerialfifohead2 = 0U;
-   RXSerialfifotail2 = 0U;
-}
-
-// How full is queue
-// TODO decide if how full or how empty is preferred info to return
-uint16_t TXSerialfifolevel2()
-{
-   uint32_t tail = TXSerialfifotail2;
-   uint32_t head = TXSerialfifohead2;
-
-   if (tail > head)
-      return TX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-uint16_t RXSerialfifolevel2()
-{
-   uint32_t tail = RXSerialfifotail2;
-   uint32_t head = RXSerialfifohead2;
-
-   if (tail > head)
-      return RX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-// Flushes the transmit shift register
-// warning: this call is blocking
-void TXSerialFlush2()
-{
-   // wait until the TXE shows the shift register is empty
-   while (USART_GetITStatus(USART2, USART_FLAG_TXE))
-      ;
-}
-
-uint8_t TXSerialfifoput2(uint8_t next)
-{
-   if (TXSerialfifolevel2() < TX_SERIAL_FIFO_SIZE) {
-      TXSerialfifo2[TXSerialfifohead2] = next;
-
-      TXSerialfifohead2++;
-      if (TXSerialfifohead2 >= TX_SERIAL_FIFO_SIZE)
-         TXSerialfifohead2 = 0U;
-
-      // make sure transmit interrupts are enabled as long as there is data to send
-      USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
-      return 1U;
-   } else {
-      return 0U; // signal an overflow occurred by returning a zero count
-   }
-}
 
 void USART2_IRQHandler()
 {
-   uint8_t c;
+   m_USART2.handleIRQ();
-
-   if (USART_GetITStatus(USART2, USART_IT_RXNE)) {
-      c = (uint8_t) USART_ReceiveData(USART2);
-
-      if (RXSerialfifolevel2() < RX_SERIAL_FIFO_SIZE) {
-         RXSerialfifo2[RXSerialfifohead2] = c;
-
-         RXSerialfifohead2++;
-         if (RXSerialfifohead2 >= RX_SERIAL_FIFO_SIZE)
-            RXSerialfifohead2 = 0U;
-      } else {
-         // TODO - do something if rx fifo is full?
-      }
-
-      USART_ClearITPendingBit(USART2, USART_IT_RXNE);
-   }
-
-   if (USART_GetITStatus(USART2, USART_IT_TXE)) {
-      c = 0U;
-
-      if (TXSerialfifohead2 != TXSerialfifotail2) { // if the fifo is not empty
-         c = TXSerialfifo2[TXSerialfifotail2];
-
-         TXSerialfifotail2++;
-         if (TXSerialfifotail2 >= TX_SERIAL_FIFO_SIZE)
-            TXSerialfifotail2 = 0U;
-
-         USART_SendData(USART2, c);
-      } else { // if there's no more data to transmit then turn off TX interrupts
-         USART_ITConfig(USART2, USART_IT_TXE, DISABLE);
-      }
-
-      USART_ClearITPendingBit(USART2, USART_IT_TXE);
-   }
 }
 
 void InitUSART2(int speed)
@@ -392,41 +158,7 @@ void InitUSART2(int speed)
 
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
 
-   // initialize the fifos
+   m_USART2.init(USART2);
-   TXSerialfifoinit2();
-   RXSerialfifoinit2();
-}
-
-uint8_t AvailUSART2()
-{
-   if (RXSerialfifolevel2() > 0U)
-      return 1U;
-   else
-      return 0U;
-}
-
-int AvailForWriteUSART2()
-{
-   return TX_SERIAL_FIFO_SIZE - TXSerialfifolevel2();
-}
-
-uint8_t ReadUSART2()
-{
-   uint8_t data_c = RXSerialfifo2[RXSerialfifotail2];
-
-   RXSerialfifotail2++;
-   if (RXSerialfifotail2 >= RX_SERIAL_FIFO_SIZE)
-      RXSerialfifotail2 = 0U;
-
-   return data_c;
-}
-
-void WriteUSART2(const uint8_t* data, uint16_t length)
-{
-   for (uint16_t i = 0U; i < length; i++)
-      TXSerialfifoput2(data[i]);
-
-   USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
 }
 
 #endif
@@ -434,111 +166,11 @@ void WriteUSART2(const uint8_t* data, uint16_t length)
 /* ************* USART3 ***************** */
 #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
 
-volatile uint8_t  TXSerialfifo3[TX_SERIAL_FIFO_SIZE];
+static CSTMUART m_USART3;
-volatile uint8_t  RXSerialfifo3[RX_SERIAL_FIFO_SIZE];
-volatile uint16_t TXSerialfifohead3, TXSerialfifotail3;
-volatile uint16_t RXSerialfifohead3, RXSerialfifotail3;
-
-// Init queues
-void TXSerialfifoinit3()
-{
-   TXSerialfifohead3 = 0U;
-   TXSerialfifotail3 = 0U;
-}
-
-void RXSerialfifoinit3()
-{
-   RXSerialfifohead3 = 0U;
-   RXSerialfifotail3 = 0U;
-}
-
-// How full is queue
-// TODO decide if how full or how empty is preferred info to return
-uint16_t TXSerialfifolevel3()
-{
-   uint32_t tail = TXSerialfifotail3;
-   uint32_t head = TXSerialfifohead3;
-
-   if (tail > head)
-      return TX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-uint16_t RXSerialfifolevel3()
-{
-   uint32_t tail = RXSerialfifotail3;
-   uint32_t head = RXSerialfifohead3;
-
-   if (tail > head)
-      return RX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-// Flushes the transmit shift register
-// warning: this call is blocking
-void TXSerialFlush3()
-{
-   // wait until the TXE shows the shift register is empty
-   while (USART_GetITStatus(USART3, USART_FLAG_TXE))
-      ;
-}
-
-uint8_t TXSerialfifoput3(uint8_t next)
-{
-   if (TXSerialfifolevel3() < TX_SERIAL_FIFO_SIZE) {
-      TXSerialfifo3[TXSerialfifohead3] = next;
-
-      TXSerialfifohead3++;
-      if (TXSerialfifohead3 >= TX_SERIAL_FIFO_SIZE)
-         TXSerialfifohead3 = 0U;
-
-      // make sure transmit interrupts are enabled as long as there is data to send
-      USART_ITConfig(USART3, USART_IT_TXE, ENABLE);
-      return 1U;
-   } else {
-      return 0U; // signal an overflow occurred by returning a zero count
-   }
-}
 
 void USART3_IRQHandler()
 {
-   uint8_t c;
+   m_USART3.handleIRQ();
-
-   if (USART_GetITStatus(USART3, USART_IT_RXNE)) {
-      c = (uint8_t) USART_ReceiveData(USART3);
-
-      if (RXSerialfifolevel3() < RX_SERIAL_FIFO_SIZE) {
-         RXSerialfifo3[RXSerialfifohead3] = c;
-
-         RXSerialfifohead3++;
-         if (RXSerialfifohead3 >= RX_SERIAL_FIFO_SIZE)
-            RXSerialfifohead3 = 0U;
-      } else {
-         // TODO - do something if rx fifo is full?
-      }
-
-      USART_ClearITPendingBit(USART3, USART_IT_RXNE);
-   }
-
-   if (USART_GetITStatus(USART3, USART_IT_TXE)) {
-      c = 0U;
-
-      if (TXSerialfifohead3 != TXSerialfifotail3) { // if the fifo is not empty
-         c = TXSerialfifo3[TXSerialfifotail3];
-
-         TXSerialfifotail3++;
-         if (TXSerialfifotail3 >= TX_SERIAL_FIFO_SIZE)
-            TXSerialfifotail3 = 0U;
-
-         USART_SendData(USART3, c);
-      } else { // if there's no more data to transmit then turn off TX interrupts
-         USART_ITConfig(USART3, USART_IT_TXE, DISABLE);
-      }
-
-      USART_ClearITPendingBit(USART3, USART_IT_TXE);
-   }
 }
 
 #if defined(STM32F7_NUCLEO)
@@ -600,41 +232,7 @@ void InitUSART3(int speed)
 
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
 
-   // initialize the fifos
+   m_USART3.init(USART3);
-   TXSerialfifoinit3();
-   RXSerialfifoinit3();
-}
-
-uint8_t AvailUSART3()
-{
-   if (RXSerialfifolevel3() > 0U)
-      return 1U;
-   else
-      return 0U;
-}
-
-int AvailForWriteUSART3()
-{
-   return TX_SERIAL_FIFO_SIZE - TXSerialfifolevel3();
-}
-
-uint8_t ReadUSART3()
-{
-   uint8_t data_c = RXSerialfifo3[RXSerialfifotail3];
-
-   RXSerialfifotail3++;
-   if (RXSerialfifotail3 >= RX_SERIAL_FIFO_SIZE)
-      RXSerialfifotail3 = 0U;
-
-   return data_c;
-}
-
-void WriteUSART3(const uint8_t* data, uint16_t length)
-{
-   for (uint16_t i = 0U; i < length; i++)
-      TXSerialfifoput3(data[i]);
-
-   USART_ITConfig(USART3, USART_IT_TXE, ENABLE);
 }
 
 #endif
@@ -642,111 +240,11 @@ void WriteUSART3(const uint8_t* data, uint16_t length)
 /* ************* UART5 ***************** */
 #if !(defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER))
 
-volatile uint8_t  TXSerialfifo5[TX_SERIAL_FIFO_SIZE];
+static CSTMUART m_UART5;
-volatile uint8_t  RXSerialfifo5[RX_SERIAL_FIFO_SIZE];
-volatile uint16_t TXSerialfifohead5, TXSerialfifotail5;
-volatile uint16_t RXSerialfifohead5, RXSerialfifotail5;
-
-// Init queues
-void TXSerialfifoinit5()
-{
-   TXSerialfifohead5 = 0U;
-   TXSerialfifotail5 = 0U;
-}
-
-void RXSerialfifoinit5()
-{
-   RXSerialfifohead5 = 0U;
-   RXSerialfifotail5 = 0U;
-}
-
-// How full is queue
-// TODO decide if how full or how empty is preferred info to return
-uint16_t TXSerialfifolevel5()
-{
-   uint32_t tail = TXSerialfifotail5;
-   uint32_t head = TXSerialfifohead5;
-
-   if (tail > head)
-      return TX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-uint16_t RXSerialfifolevel5()
-{
-   uint32_t tail = RXSerialfifotail5;
-   uint32_t head = RXSerialfifohead5;
-
-   if (tail > head)
-      return RX_SERIAL_FIFO_SIZE + head - tail;
-   else
-      return head - tail;
-}
-
-// Flushes the transmit shift register
-// warning: this call is blocking
-void TXSerialFlush5()
-{
-   // wait until the TXE shows the shift register is empty
-   while (USART_GetITStatus(UART5, USART_FLAG_TXE))
-      ;
-}
-
-uint8_t TXSerialfifoput5(uint8_t next)
-{
-   if (TXSerialfifolevel5() < TX_SERIAL_FIFO_SIZE) {
-      TXSerialfifo5[TXSerialfifohead5] = next;
-
-      TXSerialfifohead5++;
-      if (TXSerialfifohead5 >= TX_SERIAL_FIFO_SIZE)
-         TXSerialfifohead5 = 0U;
-
-      // make sure transmit interrupts are enabled as long as there is data to send
-      USART_ITConfig(UART5, USART_IT_TXE, ENABLE);
-      return 1U;
-   } else {
-      return 0U; // signal an overflow occurred by returning a zero count
-   }
-}
 
 void UART5_IRQHandler()
 {
-   uint8_t c;
+   m_UART5.handleIRQ();
-
-   if (USART_GetITStatus(UART5, USART_IT_RXNE)) {
-      c = (uint8_t) USART_ReceiveData(UART5);
-
-      if (RXSerialfifolevel5() < RX_SERIAL_FIFO_SIZE) {
-         RXSerialfifo5[RXSerialfifohead5] = c;
-
-         RXSerialfifohead5++;
-         if (RXSerialfifohead5 >= RX_SERIAL_FIFO_SIZE)
-            RXSerialfifohead5 = 0U;
-      } else {
-         // TODO - do something if rx fifo is full?
-      }
-
-      USART_ClearITPendingBit(UART5, USART_IT_RXNE);
-   }
-
-   if (USART_GetITStatus(UART5, USART_IT_TXE)) {
-      c = 0U;
-
-      if (TXSerialfifohead5 != TXSerialfifotail5) { // if the fifo is not empty
-         c = TXSerialfifo5[TXSerialfifotail5];
-
-         TXSerialfifotail5++;
-         if (TXSerialfifotail5 >= TX_SERIAL_FIFO_SIZE)
-            TXSerialfifotail5 = 0U;
-
-         USART_SendData(UART5, c);
-      } else { // if there's no more data to transmit then turn off TX interrupts
-      USART_ITConfig(UART5, USART_IT_TXE, DISABLE);
-      }
-
-      USART_ClearITPendingBit(UART5, USART_IT_TXE);
-   }
 }
 
 void InitUART5(int speed)
@@ -795,41 +293,7 @@ void InitUART5(int speed)
 
    USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
 
-   // initialize the fifos
+   m_UART5.init(UART5);
-   TXSerialfifoinit5();
-   RXSerialfifoinit5();
-}
-
-uint8_t AvailUART5()
-{
-   if (RXSerialfifolevel5() > 0U)
-      return 1U;
-   else
-      return 0U;
-}
-
-int AvailForWriteUART5()
-{
-   return TX_SERIAL_FIFO_SIZE - TXSerialfifolevel5();
-}
-
-uint8_t ReadUART5()
-{
-   uint8_t data_c = RXSerialfifo5[RXSerialfifotail5];
-
-   RXSerialfifotail5++;
-   if (RXSerialfifotail5 >= RX_SERIAL_FIFO_SIZE)
-      RXSerialfifotail5 = 0U;
-
-   return data_c;
-}
-
-void WriteUART5(const uint8_t* data, uint16_t length)
-{
-   for (uint16_t i = 0U; i < length; i++)
-      TXSerialfifoput5(data[i]);
-
-   USART_ITConfig(UART5, USART_IT_TXE, ENABLE);
 }
 
 #endif
@@ -841,15 +305,19 @@ void CSerialPort::beginInt(uint8_t n, int speed)
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
          InitUSART3(speed);
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI)
+         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM) || defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
          InitUSART1(speed);
-         #elif defined(STM32F4_NUCLEO)
+         #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
          InitUSART2(speed);
+         #elif defined(DRCC_DVM)
+         InitUSART1(speed);
          #endif
          break;
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
          InitUSART1(speed);
+         #elif defined(DRCC_DVM)
+         InitUSART2(speed);
          #else
          InitUART5(speed);
          #endif
@@ -864,17 +332,21 @@ int CSerialPort::availableInt(uint8_t n)
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         return AvailUSART3();
+         return m_USART3.availble();//AvailUSART3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI)
+         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM) || defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
-         return AvailUSART1();
+         return m_USART1.available();//AvailUSART1();
-         #elif defined(STM32F4_NUCLEO)
+         #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         return AvailUSART2();
+         return m_USART2.available();//AvailUSART2();
+         #elif defined(DRCC_DVM)
+         return m_USART1.available();//AvailUSART1();
          #endif
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         return AvailUSART1();
+         return m_USART1.available(); //AvailUSART1();
+         #elif defined(DRCC_DVM)
+         return m_USART2.available(); //AvailUSART2();
          #else
-         return AvailUART5();
+         return m_UART5.available();//AvailUART5();
          #endif
       default:
          return 0;
@@ -886,17 +358,21 @@ int CSerialPort::availableForWriteInt(uint8_t n)
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         return AvailForWriteUSART3();
+         return m_USART3.availableForWrite(); //AvailForWriteUSART3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI)
+         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM) || defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
-         return AvailForWriteUSART1();
+         return m_USART1.availableForWrite(); //AvailForWriteUSART1();
-         #elif defined(STM32F4_NUCLEO)
+         #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         return AvailForWriteUSART2();
+         return m_USART2.availableForWrite();//AvailForWriteUSART2();
+         #elif defined(DRCC_DVM)
+         return m_USART1.availableForWrite();//AvailForWriteUSART1();
          #endif
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         return AvailForWriteUSART1();
+         return m_USART1.availableForWrite(); //AvailForWriteUSART1();
+         #elif defined(DRCC_DVM)
+         return m_USART2.availableForWrite();//AvailForWriteUSART2();
          #else
-         return AvailForWriteUART5();
+         return m_UART5.availableForWrite();//AvailForWriteUART5();
          #endif
       default:
          return 0;
@@ -908,17 +384,21 @@ uint8_t CSerialPort::readInt(uint8_t n)
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         return ReadUSART3();
+         return m_USART3.read();//ReadUSART3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI)
+         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM) || defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
-         return ReadUSART1();
+         return m_USART1.read();//ReadUSART1();
-         #elif defined(STM32F4_NUCLEO)
+         #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         return ReadUSART2();
+         return m_USART2.read();//ReadUSART2();
+         #elif defined(DRCC_DVM)
+         return m_USART1.read();//ReadUSART1();
          #endif
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         return ReadUSART1();
+         return m_USART1.read();//ReadUSART1();
+         #elif defined(DRCC_DVM)
+         return m_USART2.read();//ReadUSART2();
          #else
-         return ReadUART5();
+         return m_UART5.read();//ReadUART5();
          #endif
       default:
          return 0U;
@@ -930,28 +410,36 @@ void CSerialPort::writeInt(uint8_t n, const uint8_t* data, uint16_t length, bool
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         WriteUSART3(data, length);
+         m_USART3.write(data, length); //WriteUSART3(data, length);
          if (flush)
-            TXSerialFlush3();
+            m_USART3.flush();//TXSerialFlush3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI)
+         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM) || defined(STM32F4_EDA_405) || defined(STM32F4_EDA_446)
-         WriteUSART1(data, length);
+         m_USART1.write(data, length);//WriteUSART1(data, length);
          if (flush)
-            TXSerialFlush1();
+            m_USART1.flush();//TXSerialFlush1();
-         #elif defined(STM32F4_NUCLEO)
+         #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         WriteUSART2(data, length);
+         m_USART2.write(data, length);//WriteUSART2(data, length);
          if (flush)
-            TXSerialFlush2();
+            m_USART2.flush();//TXSerialFlush2();
+         #elif defined(DRCC_DVM)
+         m_USART1.write(data, length);//WriteUSART1(data, length);
+         if (flush)
+            m_USART1.flush();//TXSerialFlush1();
          #endif
          break;
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         WriteUSART1(data, length);
+         m_USART1.write(data, length); //WriteUSART1(data, length);
          if (flush)
-            TXSerialFlush1();
+            m_USART1.flush();
+         #elif defined(DRCC_DVM)
+         m_USART2.write(data, length);//WriteUSART2(data, length);
+         if (flush)
+            m_USART2.flush();//TXSerialFlush2();
          #else
-         WriteUART5(data, length);
+         m_UART5.write(data, length);//WriteUART5(data, length);
          if (flush)
-            TXSerialFlush5();
+            m_UART5.flush();//TXSerialFlush5();
          #endif
          break;
       default:
@@ -960,3 +448,4 @@ void CSerialPort::writeInt(uint8_t n, const uint8_t* data, uint16_t length, bool
 }
 
 #endif
+

Tools/FMGenerateFilterCoefficients.py

@@ -0,0 +1,46 @@
+# based on https://github.com/berndporr/iir_fixed_point/blob/master/gen_coeff.py
+
+import numpy as np
+import scipy.signal as signal
+import pylab as pl
+
+# Calculate the coefficients for a pure fixed point
+# integer filter
+
+# sampling rate
+fs = 24000
+
+# cutoffs
+f1 = 300
+f2 = 2700
+# ripple
+rp = 0.2
+
+# scaling factor in bits, do not change !
+q = 15
+# scaling factor as facor...
+scaling_factor = 2**q
+
+# let's generate a sequence of 2nd order IIR filters
+sos = signal.cheby1(3,rp,[f1, f2],'bandpass', output='sos', fs=fs)
+#os = signal.cheby1(4, rp, f2, 'lowpass', output='sos', fs=fs) #deemphasis filter
+#sos = signal.cheby1(1, rp, 2122, 'highpass', output='sos', fs=fs) #deemphasis filter
+
+sosrounded = np.round((sos) * scaling_factor)
+
+# print coefficients
+for biquad in sosrounded:
+    for coeff in biquad:
+        print(int(coeff),",",sep="",end="")
+        #print((coeff),",",sep="",end="")
+    print("")
+
+# plot the frequency response
+b,a = signal.sos2tf(sos)
+w,h = signal.freqz(b,a, worN=2048)
+pl.plot(w/np.pi/2*fs,20*np.log(np.abs(h)))
+pl.xlabel('frequency/Hz');
+pl.ylabel('gain/dB');
+pl.ylim(top=1,bottom=-30);
+pl.xlim(left=250, right=12000);
+pl.show()

Tools/emphasis.txt

@@ -0,0 +1,58 @@
+% GNU Octave script to generate pre and deemphasis filters
+% https://dsp.stackexchange.com/questions/34605/biquad-cookbook-formula-for-broadcast-fm-de-emphasis
+% PACKAGES
+
+pkg load control
+pkg load signal
+
+clear all;
+clc;
+
+fs = 24000;
+samplingtime = 1/fs;
+
+% analog prototype
+A2 = [1];
+B2 = [0.000075 1];
+
+% Pre
+Ds = tf(B2, A2);
+% De
+% Ds = tf(A2, B2);
+ 
+Ds = Ds/dcgain(Ds);
+
+% MZT
+T1 = 0.000075; % 75us
+z1 = -exp(-1.0/(fs*T1));
+p1 = 1+z1;
+
+a0 = 1.0;
+a1 = p1;
+a2 = 0;
+
+b0 = 1.0;
+b1 = z1;
+b2 = 0;
+
+% swap between a1, b1 to select pre- or de-emphasis
+
+# Pre
+Bmzt = [b0 a1 b2]
+Amzt = [a0 b1 a2]
+% De
+% Bmzt = [b0 b1 b2]
+% Amzt = [a0 a1 a2]
+
+DzMZT = tf(Amzt, Bmzt, samplingtime);
+DzMZT = DzMZT/dcgain(DzMZT);
+
+%% Plot
+wmin = 2 * pi * 20.0; % 20Hz
+wmax = 2 * pi * ((fs/2.0) - (fs/2 - 20000)); %20kHz
+
+figure(1);
+bode(Ds, 'b', DzMZT, 'c', {wmin, wmax});
+legend('Analog prototype', 'MZT 2nd order','location', 'northwest');
+grid on;
+pause();