Merge branch 'master' into AX25

YSF pictures can go through modem

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 +1,266 @@
+/*
+ *   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 = 96U;
+
+q15_t LPF_FILTER_COEFFS[] = {
+     0,    0,    0,    1,    2,    5,    8,   12,   18,   23,
+    29,   33,   36,   36,   33,   25,   13,   -5,  -28,  -57,
+   -89, -123, -159, -194, -225, -249, -264, -267, -254, -224,
+  -175, -104,  -12,  102,  236,  389,  557,  738,  926, 1117,
+  1306, 1486, 1654, 1802, 1927, 2025, 2092, 2126, 2126, 2092,
+  2025, 1927, 1802, 1654, 1486, 1306, 1117,  926,  738,  557,
+   389,  236,  102,  -12, -104, -175, -224, -254, -267, -264,
+  -249, -225, -194, -159, -123,  -89,  -57,  -28,   -5,   13,
+    25,   33,   36,   36,   33,   29,   23,   18,   12,    8,
+     5,    2,    1,    0,    0,    0
+};
+
+// 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_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;
+}
+
+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 offset = m_pllCount / float32_t(m_pllBits);
+    float32_t jitter;
+    ::arm_fir_f32(&m_pllFilter, &offset, &jitter, 1U);
+
+    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);
+}
+

AX25Demodulator.h

@@ -0,0 +1,67 @@
+/*
+ *   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);
+
+private:
+  CAX25Frame           m_frame;
+  CAX25Twist           m_twist;
+  arm_fir_instance_q15 m_lpfFilter;
+  q15_t                m_lpfState[120U];    // NoTaps + BlockSize - 1, 96 + 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;
+  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);
+};
+
+#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 +1,120 @@
+/*
+ *   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 = 132;
+q15_t FILTER_COEFFS[] = {
+      0,     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,     0
+};
+
+CAX25RX::CAX25RX() :
+m_filter(),
+m_state(),
+m_demod1(3),
+m_demod2(6),
+m_demod3(9),
+m_lastFCS(0U),
+m_count(0U)
+{
+  m_filter.numTaps = FILTER_LEN;
+  m_filter.pState  = m_state;
+  m_filter.pCoeffs = FILTER_COEFFS;
+}
+
+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");
+  }
+}
+
+void CAX25RX::setParams(int8_t twist)
+{
+  m_demod1.setTwist(twist - 3);
+  m_demod2.setTwist(twist);
+  m_demod3.setTwist(twist + 3);
+}
+

AX25RX.h

@@ -1,6 +1,5 @@
 /*
  *   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
@@ -17,32 +16,30 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-
+#if !defined(AX25RX_H)
-#if !defined(FMUPSAMPLER_H)
+#define  AX25RX_H
-#define FMUPSAMPLER_H
 
 #include "Config.h"
-#include "RingBuffer.h"
-#include "FMSamplePairPack.h"
 
-class CFMUpSampler {
+#include "AX25Demodulator.h"
+
+class CAX25RX {
 public:
-  CFMUpSampler();
+  CAX25RX();
 
-  void reset();
+  void samples(q15_t* samples, uint8_t length);
 
-  void addData(const uint8_t* data, uint16_t length);
+  void setParams(int8_t twist);
-
-  bool getSample(q15_t& sample);
-
-  uint16_t getSpace() const;
 
 private:
-  uint8_t m_upSampleIndex;
+  arm_fir_instance_q15 m_filter;
-  uint32_t m_pack;
+  q15_t                m_state[160U];    // NoTaps + BlockSize - 1, 132 + 20 - 1 plus some spare
-  uint8_t * m_packPointer;
+  CAX25Demodulator     m_demod1;
-  CRingBuffer<TSamplePairPack> m_samples;
+  CAX25Demodulator     m_demod2;
-  bool m_running;
+  CAX25Demodulator     m_demod3;
+  uint16_t             m_lastFCS;
+  uint32_t             m_count;
 };
 
-#endif
+#endif
+

AX25TX.cpp

@@ -0,0 +1,180 @@
+/*
+ *   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_twist(-6),
+m_poBuffer(),
+m_poLen(0U),
+m_poPtr(0U),
+m_txDelay(120U),
+m_tablePtr(0U),
+m_nrzi(false)
+{
+}
+
+void CAX25TX::process()
+{
+  if (m_poLen == 0U)
+    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 (already NRZI)
+  for (uint16_t i = 0U; i < m_txDelay; i++, m_poLen++)
+    WRITE_BIT1(m_poBuffer, m_poLen, false);
+
+  // 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 in[AX25_RADIO_SYMBOL_LENGTH];
+  for (uint8_t i = 0U; i < AX25_RADIO_SYMBOL_LENGTH; i++) {
+    in[i] = AUDIO_TABLE_DATA[m_tablePtr];
+    if (b)
+      m_tablePtr += 6U;
+    else
+      m_tablePtr += 11U;
+
+    if (m_tablePtr >= AUDIO_TABLE_LEN)
+      m_tablePtr -= AUDIO_TABLE_LEN;
+  }
+
+  q15_t out[AX25_RADIO_SYMBOL_LENGTH];
+  m_twist.process(in, out, AX25_RADIO_SYMBOL_LENGTH);
+
+  io.write(STATE_AX25, out, AX25_RADIO_SYMBOL_LENGTH);
+}
+
+void CAX25TX::setParams(int8_t twist)
+{
+  m_twist.setTwist(twist);
+}
+
+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)
+{
+    bool result = (b == m_nrzi);
+
+    m_nrzi = b;
+
+    return result;
+}
+

AX25TX.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(AX25TX_H)
+#define  AX25TX_H
+
+#include "Config.h"
+
+#include "AX25Twist.h"
+
+class CAX25TX {
+public:
+  CAX25TX();
+
+  uint8_t writeData(const uint8_t* data, uint16_t length);
+
+  void process();
+
+  void setParams(int8_t twist);
+
+  void setTXDelay(uint8_t delay);
+
+  uint8_t getSpace() const;
+
+private:
+  CAX25Twist m_twist;
+  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

@@ -1,6 +1,5 @@
 /*
  *   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
@@ -17,13 +16,24 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#if !defined(TSAMPLEPACK_H)
+#if !defined(AX25Twist_H)
-#define TSAMPLEPACK_H
+#define  AX25Twist_H
 
-struct TSamplePairPack {
+#include "Config.h"
-  uint8_t byte0;
+
-  uint8_t byte1;
+
-  uint8_t byte2;
+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
+#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
@@ -125,7 +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));
 

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

@@ -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
  *   Copyright (C) 2020 by Phil Taylor M0VSE
  *
@@ -52,7 +52,7 @@ void CCalFM::process()
 {
   const TONE_TABLE* entry = NULL;
 
-  if (m_modemState != m_lastState)
+  if (m_modemState!=m_lastState)
   {
     switch (m_modemState) {
         case STATE_FMCAL10K:
@@ -116,7 +116,7 @@ void CCalFM::process()
 }
 
 
-uint8_t CCalFM::write(const uint8_t* data, uint8_t length)
+uint8_t CCalFM::write(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;

CalFM.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
  *   Copyright (C) 2020 by Phil Taylor M0VSE
  *
@@ -35,7 +35,7 @@ public:
   void fm25kcal();
   void fm30kcal();
 
-  uint8_t write(const uint8_t* data, uint8_t length);
+  uint8_t write(const uint8_t* data, uint16_t length);
 
 private:
   uint16_t  m_frequency;

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

@@ -1,5 +1,6 @@
 /*
  *   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
@@ -38,7 +39,7 @@ void CCalPOCSAG::process()
   pocsagTX.writeByte(0xAAU);
 }
 
-uint8_t CCalPOCSAG::write(const uint8_t* data, uint8_t length)
+uint8_t CCalPOCSAG::write(const uint8_t* data, uint16_t length)
 {
   if (length != 1U)
     return 4U;

CalPOCSAG.h

@@ -1,5 +1,6 @@
 /*
  *   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
@@ -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:
   POCSAGCAL m_state;

Config.h

@@ -35,16 +35,8 @@
 // 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 via LEDs
-// #define MODE_LEDS
+#define MODE_LEDS
 
 // For the original Arduino Due pin layout
 // #define ARDUINO_DUE_PAPA

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
  *
@@ -74,7 +74,7 @@ void CDMRDMOTX::process()
       m_poLen = m_txDelay;
     } else {
       for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
-        m_fifo.get(m_poBuffer[i]);
+        m_poBuffer[i] = m_fifo.get();
 
       for (unsigned int i = 0U; i < 39U; i++)
         m_poBuffer[i + DMR_FRAME_LENGTH_BYTES] = PR_FILL[i];
@@ -104,7 +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 "RingBuffer.h"
+#include "SerialRB.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:
-  CRingBuffer<uint8_t>                        m_fifo;
+  CSerialRB                        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_fifo[slotIndex].get(m_poBuffer[i]);
+      m_poBuffer[i]   = m_fifo[slotIndex].get();
       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 "RingBuffer.h"
+#include "SerialRB.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:
-  CRingBuffer<uint8_t>                        m_fifo[2U];
+  CSerialRB                        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
@@ -216,13 +216,12 @@ 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(dummy);
+      m_buffer.get();
 
       uint8_t header[DSTAR_HEADER_LENGTH_BYTES];
       for (uint8_t i = 0U; i < DSTAR_HEADER_LENGTH_BYTES; i++)
-        m_buffer.get(header[i]);
+        header[i] = m_buffer.get();
 
       uint8_t buffer[86U];
       txHeader(header, buffer + 2U);
@@ -240,19 +239,17 @@ void CDStarTX::process()
  
   if (type == DSTAR_DATA && m_poLen == 0U) {
     // Pop the type byte off
-    uint8_t dummy;
+    m_buffer.get();
-    m_buffer.get(dummy);
 
     for (uint8_t i = 0U; i < DSTAR_DATA_LENGTH_BYTES; i++)
-      m_buffer.get(m_poBuffer[m_poLen++]);
+      m_poBuffer[m_poLen++] = m_buffer.get();
 
     m_poPtr = 0U;
   }
 
   if (type == DSTAR_EOT && m_poLen == 0U) {
     // Pop the type byte off
-    uint8_t dummy;
+    m_buffer.get();
-    m_buffer.get(dummy);
 
     for (uint8_t j = 0U; j < 3U; j++) {
       for (uint8_t i = 0U; i < DSTAR_EOT_LENGTH_BYTES; i++)
@@ -280,7 +277,7 @@ 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;
@@ -299,7 +296,7 @@ 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;

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 "RingBuffer.h"
+#include "SerialRB.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:
-  CRingBuffer<uint8_t>             m_buffer;
+  CSerialRB                        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.cpp

@@ -20,16 +20,17 @@
 #include "Globals.h"
 #include "FM.h"
 
-
+/*
-const uint16_t FM_TX_BLOCK_SIZE = 100U;
+ * Access Mode values are:
-const uint16_t FM_SERIAL_BLOCK_SIZE = 84U;//this is the number of sample pairs to send over serial. One sample pair is 3bytes.
+ *   0 - Carrier access with COS
-                                          //three times this value shall never exceed 252
+ *   1 - CTCSS only access without COS
-const uint16_t FM_SERIAL_BLOCK_SIZE_BYTES = FM_SERIAL_BLOCK_SIZE * 3U;
+ *   2 - CTCSS only access with COS
+ *   3 - CTCSS only access with COS to start, then carrier access with COS
+ */
 
 CFM::CFM() :
 m_callsign(),
 m_rfAck(),
-m_extAck(),
 m_ctcssRX(),
 m_ctcssTX(),
 m_timeoutTone(),
@@ -41,156 +42,124 @@ m_callsignTimer(),
 m_timeoutTimer(),
 m_holdoffTimer(),
 m_kerchunkTimer(),
-m_kerchunkTX(true),
 m_ackMinTimer(),
 m_ackDelayTimer(),
 m_hangTimer(),
-m_statusTimer(),
+m_reverseTimer(),
 m_filterStage1(  724,   1448,   724, 32768, -37895, 21352),//3rd order Cheby Filter 300 to 2700Hz, 0.2dB passband ripple, sampling rate 24kHz
 m_filterStage2(32768,      0,-32768, 32768, -50339, 19052),
 m_filterStage3(32768, -65536, 32768, 32768, -64075, 31460),
 m_blanking(),
-m_useCOS(true),
+m_accessMode(1U),
 m_cosInvert(false),
 m_rfAudioBoost(1U),
-m_extAudioBoost(1U),
+m_downsampler(128U),//Size might need adjustement
-m_downsampler(400U),// 100 ms of audio
-m_extEnabled(false),
 m_rxLevel(1),
-m_inputRFRB(2401U),   // 100ms of audio + 1 sample
+m_inputRB(4800U),   // 200ms of audio
-m_outputRFRB(2400U),  // 100ms of audio
+m_outputRB(2400U)   // 100ms of audio
-m_inputExtRB()
 {
-  m_statusTimer.setTimeout(1U, 0U);
+  m_reverseTimer.setTimeout(0U, 150U);
 
   insertDelay(100U);
 }
 
-void CFM::samples(bool cos, q15_t* samples, uint8_t length)
+void CFM::samples(bool cos, const q15_t* samples, uint8_t length)
 {
-  if (m_useCOS) {
+  if (m_cosInvert)
-    if (m_cosInvert)
+    cos = !cos;
-      cos = !cos;
-  } else {
-    cos = true;
-  }
 
   clock(length);
 
   uint8_t i = 0U;
   for (; i < length; i++) {
     // ARMv7-M has hardware integer division 
-    q15_t currentRFSample = q15_t((q31_t(samples[i]) << 8) / m_rxLevel);
+    q15_t currentSample = q15_t((q31_t(samples[i]) << 8) / m_rxLevel);
-    uint8_t ctcssState = m_ctcssRX.process(currentRFSample);
 
-    if (!m_useCOS) {
+    switch (m_accessMode) {
-      // Delay the audio by 100ms to better match the CTCSS detector output
+      case 0U:
-      m_inputRFRB.put(currentRFSample);
+        stateMachine(cos);
-      m_inputRFRB.get(currentRFSample);
+        break;
+
+      case 1U: {
+          uint8_t ctcssState = m_ctcssRX.process(currentSample);
+
+          // Delay the audio by 100ms to better match the CTCSS detector output
+          m_inputRB.put(currentSample);
+          m_inputRB.get(currentSample);
+
+          if (CTCSS_NOT_READY(ctcssState) && m_modemState != STATE_FM) {
+            // Not enough samples to determine if you have CTCSS, just carry on
+          } else {
+            bool validCTCSS = CTCSS_VALID(ctcssState);
+            stateMachine(validCTCSS);
+          }
+        }
+        break;
+
+      case 2U: {
+          uint8_t ctcssState = m_ctcssRX.process(currentSample);
+          if (CTCSS_NOT_READY(ctcssState) && m_modemState != STATE_FM) {
+            // Not enough samples to determine if you have CTCSS, just carry on
+          } else {
+            bool validCTCSS = CTCSS_VALID(ctcssState);
+            stateMachine(validCTCSS && cos);
+          }
+        }
+        break;
+
+      default: {
+          uint8_t ctcssState = m_ctcssRX.process(currentSample);
+          if (CTCSS_NOT_READY(ctcssState) && m_modemState != STATE_FM) {
+            // Not enough samples to determine if you have CTCSS, just carry on
+          } else if (CTCSS_READY(ctcssState) && m_modemState != STATE_FM) {
+            // We had enough samples for CTCSS and we are in some other mode than FM
+            bool validCTCSS = CTCSS_VALID(ctcssState);
+            stateMachine(validCTCSS && cos);
+          } else {
+            stateMachine(cos);
+          }
+        }
+        break;
     }
 
-    q15_t currentExtSample;
+    if (m_modemState != STATE_FM)
-    bool inputExt = m_inputExtRB.getSample(currentExtSample);//always consume the external input data so it does not overflow
-    inputExt = inputExt && m_extEnabled;
-
-    if (!inputExt && (CTCSS_NOT_READY(ctcssState)) && m_modemState != STATE_FM) {
-      //Not enough samples to determine if you have CTCSS, just carry on. But only if we haven't any external data in the queue
       continue;
-    } else if ((inputExt || CTCSS_READY(ctcssState)) && m_modemState != STATE_FM) {
-      //we had enough samples for CTCSS and we are in some other mode than FM
-      bool validCTCSS = CTCSS_VALID(ctcssState);
-      stateMachine(validCTCSS && cos, inputExt);
-      if (m_modemState != STATE_FM)
-        continue;
-    } else if ((inputExt || CTCSS_NOT_READY(ctcssState)) && m_modemState == STATE_FM && i == length - 1) {
-      //Not enough samples for CTCSS but we already are in FM, trigger the state machine
-      //but do not trigger the state machine on every single sample, save CPU!
-      bool validCTCSS = CTCSS_VALID(ctcssState);
-      stateMachine(validCTCSS && cos, inputExt);
-    }
 
-    q15_t currentSample = currentRFSample;
+    // Only let audio through when relaying audio
-    q15_t currentBoost  = m_rfAudioBoost;
+    if (m_state == FS_RELAYING || m_state == FS_KERCHUNK) {  
-    if (m_state == FS_RELAYING_EXT || m_state == FS_KERCHUNK_EXT) {
+      // m_downsampler.addSample(currentSample);
-      currentSample = currentExtSample;
-      currentBoost  = m_extAudioBoost;
-    }
-
-    // Only let RF audio through when relaying RF audio
-    if (m_state == FS_RELAYING_RF || m_state == FS_KERCHUNK_RF || m_state == FS_RELAYING_EXT || m_state == FS_KERCHUNK_EXT) {
       currentSample = m_blanking.process(currentSample);
-      if (m_extEnabled && (m_state == FS_RELAYING_RF || m_state == FS_KERCHUNK_RF))
+      currentSample *= m_rfAudioBoost;
-        m_downsampler.addSample(currentSample);
-
-      currentSample *= currentBoost;
     } else {
       currentSample = 0;
     }
 
-    if (!m_callsign.isRunning() && !m_extAck.isRunning())
+    if (!m_callsign.isRunning())
       currentSample += m_rfAck.getHighAudio();
-
+    
-    if (!m_callsign.isRunning() && !m_rfAck.isRunning())
+    if (!m_rfAck.isRunning()) {
-      currentSample += m_extAck.getHighAudio();
-
-    if (!m_rfAck.isRunning() && !m_extAck.isRunning()) {
       if (m_state == FS_LISTENING)
         currentSample += m_callsign.getHighAudio();
       else
         currentSample += m_callsign.getLowAudio();
     }
 
-    if (!m_callsign.isRunning() && !m_rfAck.isRunning() && !m_extAck.isRunning())
-      currentSample += m_timeoutTone.getAudio();
-
     currentSample = m_filterStage3.filter(m_filterStage2.filter(m_filterStage1.filter(currentSample)));
 
-    currentSample += m_ctcssTX.getAudio();
+    if (!m_callsign.isRunning() && !m_rfAck.isRunning())
+      currentSample += m_timeoutTone.getAudio();
 
-    m_outputRFRB.put(currentSample);
+    currentSample += m_ctcssTX.getAudio(m_reverseTimer.isRunning());
+
+    m_outputRB.put(currentSample);
   }
 }
 
 void CFM::process()
 {
-  uint16_t space = io.getSpace();
+  q15_t sample;
-  uint16_t length = m_outputRFRB.getData();
+  while (io.getSpace() >= 3U && m_outputRB.get(sample))
-
+    io.write(STATE_FM, &sample, 1U);
-  if (space > 10U && length >= FM_TX_BLOCK_SIZE ) {
-    space -= 2U;
-    if (length > FM_TX_BLOCK_SIZE)
-      length = FM_TX_BLOCK_SIZE;
-    if (space > FM_TX_BLOCK_SIZE)
-      space = FM_TX_BLOCK_SIZE;
-    if (length > space)
-      length = space;
-
-    q15_t samples[FM_TX_BLOCK_SIZE];
-
-    for (uint16_t i = 0U; i < length; i++) {
-      q15_t sample = 0;
-      m_outputRFRB.get(sample);
-      samples[i] = sample;
-    }
-
-    io.write(STATE_FM, samples, length);
-  }
-
-  if (m_extEnabled) {
-    uint16_t length = m_downsampler.getData();
-
-    if (length >= FM_SERIAL_BLOCK_SIZE) {
-      if (length > FM_SERIAL_BLOCK_SIZE)
-        length = FM_SERIAL_BLOCK_SIZE;
-        
-      TSamplePairPack serialSamples[FM_SERIAL_BLOCK_SIZE];
-
-      for (uint16_t j = 0U; j < length; j++)
-        m_downsampler.getPackedData(serialSamples[j]);
-
-      serial.writeFMData((uint8_t*)serialSamples, length * sizeof(TSamplePairPack));
-    }
-  }
 }
 
 void CFM::reset()
@@ -203,18 +172,14 @@ void CFM::reset()
   m_ackMinTimer.stop();
   m_ackDelayTimer.stop();
   m_hangTimer.stop();
-  m_statusTimer.stop();
+  m_reverseTimer.stop();
 
   m_ctcssRX.reset();
   m_rfAck.stop();
-  m_extAck.stop();
   m_callsign.stop();
   m_timeoutTone.stop();
 
-  m_outputRFRB.reset();
+  m_outputRB.reset();
-  m_inputExtRB.reset();
-
-  m_downsampler.reset();
 }
 
 uint8_t CFM::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)
@@ -245,18 +210,15 @@ uint8_t CFM::setAck(const char* rfAck, uint8_t speed, uint16_t frequency, uint8_
   return m_rfAck.setParams(rfAck, speed, frequency, level, level);
 }
 
-uint8_t CFM::setMisc(uint16_t timeout, uint8_t timeoutLevel, uint8_t ctcssFrequency, uint8_t ctcssHighThreshold, uint8_t ctcssLowThreshold, uint8_t ctcssLevel, uint8_t kerchunkTime, bool kerchunkTX, uint8_t hangTime, bool useCOS, bool cosInvert, uint8_t rfAudioBoost, uint8_t maxDev, uint8_t rxLevel)
+uint8_t CFM::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, uint8_t rfAudioBoost, uint8_t maxDev, uint8_t rxLevel)
 {
-  m_useCOS    = useCOS;
+  m_accessMode = accessMode;
-  m_cosInvert = cosInvert;
+  m_cosInvert  = cosInvert;
 
   m_rfAudioBoost = q15_t(rfAudioBoost);
 
   m_timeoutTimer.setTimeout(timeout, 0U);
-
   m_kerchunkTimer.setTimeout(kerchunkTime, 0U);
-  m_kerchunkTX = kerchunkTX;
-
   m_hangTimer.setTimeout(hangTime, 0U);
 
   m_timeoutTone.setParams(timeoutLevel);
@@ -271,61 +233,49 @@ uint8_t CFM::setMisc(uint16_t timeout, uint8_t timeoutLevel, uint8_t ctcssFreque
   return m_ctcssTX.setParams(ctcssFrequency, ctcssLevel);
 }
 
-uint8_t CFM::setExt(const char* ack, uint8_t audioBoost, uint8_t speed, uint16_t frequency, uint8_t level)
+void CFM::stateMachine(bool validSignal)
-{
-  m_extEnabled = true;
-
-  m_extAudioBoost = q15_t(audioBoost);
-
-  return m_extAck.setParams(ack, speed, frequency, level, level);
-}
-
-void CFM::stateMachine(bool validRFSignal, bool validExtSignal)
 {
   switch (m_state) {
     case FS_LISTENING:
-      listeningState(validRFSignal, validExtSignal);
+      listeningState(validSignal);
       break;
-    case FS_KERCHUNK_RF:
+    case FS_KERCHUNK:
-      kerchunkRFState(validRFSignal);
+      kerchunkState(validSignal);
       break;
-    case FS_RELAYING_RF:
+    case FS_RELAYING:
-      relayingRFState(validRFSignal);
+      relayingState(validSignal);
       break;
-    case FS_RELAYING_WAIT_RF:
+    case FS_RELAYING_WAIT:
-      relayingRFWaitState(validRFSignal);
+      relayingWaitState(validSignal);
       break;
-    case FS_TIMEOUT_RF:
+    case FS_TIMEOUT:
-      timeoutRFState(validRFSignal);
+      timeoutState(validSignal);
       break;
-    case FS_TIMEOUT_WAIT_RF:
+    case FS_TIMEOUT_WAIT:
-      timeoutRFWaitState(validRFSignal);
+      timeoutWaitState(validSignal);
-      break;
-    case FS_KERCHUNK_EXT:
-      kerchunkExtState(validExtSignal);
-      break;
-    case FS_RELAYING_EXT:
-      relayingExtState(validExtSignal);
-      break;
-    case FS_RELAYING_WAIT_EXT:
-      relayingExtWaitState(validExtSignal);
-      break;
-    case FS_TIMEOUT_EXT:
-      timeoutExtState(validExtSignal);
-      break;
-    case FS_TIMEOUT_WAIT_EXT:
-      timeoutExtWaitState(validExtSignal);
       break;
     case FS_HANG:
-      hangState(validRFSignal, validExtSignal);
+      hangState(validSignal);
       break;
     default:
       break;
   }
 
-  if (m_state == FS_LISTENING && !m_rfAck.isWanted() && !m_extAck.isWanted() && !m_callsign.isWanted()) {
+  if (m_state == FS_LISTENING && m_modemState == STATE_FM) {
-    m_outputRFRB.reset();
+    if (!m_callsign.isWanted() && !m_rfAck.isWanted() && !m_reverseTimer.isRunning())
-    m_downsampler.reset();
+      m_reverseTimer.start();
+
+    if (!m_callsign.isWanted() && !m_rfAck.isWanted() && m_reverseTimer.isRunning() && m_reverseTimer.hasExpired()) {
+      DEBUG1("Change to STATE_IDLE");
+      m_modemState = STATE_IDLE;
+      m_callsignTimer.stop();
+      m_timeoutTimer.stop();
+      m_kerchunkTimer.stop();
+      m_ackMinTimer.stop();
+      m_ackDelayTimer.stop();
+      m_hangTimer.stop();
+      m_reverseTimer.stop();
+    }
   }
 }
 
@@ -338,302 +288,149 @@ void CFM::clock(uint8_t length)
   m_ackMinTimer.clock(length);
   m_ackDelayTimer.clock(length);
   m_hangTimer.clock(length);
-  m_statusTimer.clock(length);
+  m_reverseTimer.clock(length);
-
-  if (m_statusTimer.isRunning() && m_statusTimer.hasExpired()) {
-    serial.writeFMStatus(m_state);
-    m_statusTimer.start();
-  }
 }
 
-void CFM::listeningState(bool validRFSignal, bool validExtSignal)
+void CFM::listeningState(bool validSignal)
 {
-  if (validRFSignal) {
+  if (validSignal) {
     if (m_kerchunkTimer.getTimeout() > 0U) {
-      DEBUG1("State to KERCHUNK_RF");
+      DEBUG1("State to KERCHUNK");
-      m_state = FS_KERCHUNK_RF;
+      m_state = FS_KERCHUNK;
       m_kerchunkTimer.start();
       if (m_callsignAtStart && !m_callsignAtLatch)
         sendCallsign();
     } else {
-      DEBUG1("State to RELAYING_RF");
+      DEBUG1("State to RELAYING");
-      m_state = FS_RELAYING_RF;
+      m_state = FS_RELAYING;
       if (m_callsignAtStart)
         sendCallsign();
     }
 
-    if (m_state == FS_RELAYING_RF || (m_state == FS_KERCHUNK_RF && m_kerchunkTX)) {
+    insertSilence(50U);
-      insertSilence(50U);
 
-      beginRelaying();
-
-      m_callsignTimer.start();
-
-      io.setDecode(true);
-      io.setADCDetection(true);
-
-      m_statusTimer.start();
-      serial.writeFMStatus(m_state);
-    }
-  } else if (validExtSignal) {
-    if (m_kerchunkTimer.getTimeout() > 0U) {
-      DEBUG1("State to KERCHUNK_EXT");
-      m_state = FS_KERCHUNK_EXT;
-      m_kerchunkTimer.start();
-      if (m_callsignAtStart && !m_callsignAtLatch)
-        sendCallsign();
-    } else {
-      DEBUG1("State to RELAYING_EXT");
-      m_state = FS_RELAYING_EXT;
-      if (m_callsignAtStart)
-        sendCallsign();
-    }
-
-    if (m_state == FS_RELAYING_EXT || (m_state == FS_KERCHUNK_EXT && m_kerchunkTX)) {
-      insertSilence(50U);
-
-      beginRelaying();
-
-      m_callsignTimer.start();
-
-      m_statusTimer.start();
-      serial.writeFMStatus(m_state);
-    }
-  }
-}
-
-void CFM::kerchunkRFState(bool validSignal)
-{
-  if (validSignal) {
-    if (m_kerchunkTimer.hasExpired()) {
-      DEBUG1("State to RELAYING_RF");
-      m_state = FS_RELAYING_RF;
-      m_kerchunkTimer.stop();
-      if (!m_kerchunkTX) {
-        insertSilence(50U);
-
-        beginRelaying();
-
-        m_callsignTimer.start();
-
-        io.setDecode(true);
-        io.setADCDetection(true);
-
-        m_statusTimer.start();
-        serial.writeFMStatus(m_state);
-      }
-      if (m_callsignAtStart && m_callsignAtLatch) {
-        sendCallsign();
-        m_callsignTimer.start();
-      }
-    }
-  } else {
-    io.setDecode(false);
-    io.setADCDetection(false);
-
-    DEBUG1("State to LISTENING");
-    m_state = FS_LISTENING;
-    m_kerchunkTimer.stop();
-    m_timeoutTimer.stop();
-    m_ackMinTimer.stop();
-    m_callsignTimer.stop();
-    m_statusTimer.stop();
-
-    if (m_extEnabled)
-      serial.writeFMEOT();
-  }
-}
-
-void CFM::relayingRFState(bool validSignal)
-{
-  if (validSignal) {
-    if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired()) {
-      DEBUG1("State to TIMEOUT_RF");
-      m_state = FS_TIMEOUT_RF;
-      m_ackMinTimer.stop();
-      m_timeoutTimer.stop();
-      m_timeoutTone.start();
-
-      if (m_extEnabled)
-        serial.writeFMEOT();
-    }
-  } else {
-    io.setDecode(false);
-    io.setADCDetection(false);
-
-    DEBUG1("State to RELAYING_WAIT_RF");
-    m_state = FS_RELAYING_WAIT_RF;
-    m_ackDelayTimer.start();
-
-    if (m_extEnabled)
-      serial.writeFMEOT();
-  }
-
-  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
-    sendCallsign();
-    m_callsignTimer.start();
-  }
-}
-
-void CFM::relayingRFWaitState(bool validSignal)
-{
-  if (validSignal) {
-    io.setDecode(true);
-    io.setADCDetection(true);
-
-    DEBUG1("State to RELAYING_RF");
-    m_state = FS_RELAYING_RF;
-    m_ackDelayTimer.stop();
-  } else {
-    if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
-      DEBUG1("State to HANG");
-      m_state = FS_HANG;
-
-      if (m_ackMinTimer.isRunning()) {
-        if (m_ackMinTimer.hasExpired()) {
-          DEBUG1("Send RF ack");
-          m_rfAck.start();
-          m_ackMinTimer.stop();
-        }
-      } else {
-          DEBUG1("Send RF ack");
-          m_rfAck.start();
-          m_ackMinTimer.stop();
-      }
-
-      m_ackDelayTimer.stop();
-      m_timeoutTimer.stop();
-      m_hangTimer.start();
-    }
-  }
-
-  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
-    sendCallsign();
-    m_callsignTimer.start();
-  }
-}
-
-void CFM::kerchunkExtState(bool validSignal)
-{
-  if (validSignal) {
-    if (m_kerchunkTimer.hasExpired()) {
-      DEBUG1("State to RELAYING_EXT");
-      m_state = FS_RELAYING_EXT;
-      m_kerchunkTimer.stop();
-      if (!m_kerchunkTX) {
-        insertSilence(50U);
-
-        beginRelaying();
-
-        m_callsignTimer.start();
-
-        m_statusTimer.start();
-        serial.writeFMStatus(m_state);
-      }
-      if (m_callsignAtStart && m_callsignAtLatch) {
-        sendCallsign();
-        m_callsignTimer.start();
-      }
-    }
-  } else {
-    DEBUG1("State to LISTENING");
-    m_state = FS_LISTENING;
-    m_kerchunkTimer.stop();
-    m_timeoutTimer.stop();
-    m_ackMinTimer.stop();
-    m_callsignTimer.stop();
-    m_statusTimer.stop();
-  }
-}
-
-void CFM::relayingExtState(bool validSignal)
-{
-  if (validSignal) {
-    if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired()) {
-      DEBUG1("State to TIMEOUT_EXT");
-      m_state = FS_TIMEOUT_EXT;
-      m_ackMinTimer.stop();
-      m_timeoutTimer.stop();
-      m_timeoutTone.start();
-    }
-  } else {
-    DEBUG1("State to RELAYING_WAIT_EXT");
-    m_state = FS_RELAYING_WAIT_EXT;
-    m_ackDelayTimer.start();
-  }
-
-  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
-    sendCallsign();
-    m_callsignTimer.start();
-  }
-}
-
-void CFM::relayingExtWaitState(bool validSignal)
-{
-  if (validSignal) {
-    DEBUG1("State to RELAYING_EXT");
-    m_state = FS_RELAYING_EXT;
-    m_ackDelayTimer.stop();
-  } else {
-    if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
-      DEBUG1("State to HANG");
-      m_state = FS_HANG;
-
-      if (m_ackMinTimer.isRunning()) {
-        if (m_ackMinTimer.hasExpired()) {
-          DEBUG1("Send Ext ack");
-          m_extAck.start();
-          m_ackMinTimer.stop();
-        }
-      } else {
-          DEBUG1("Send Ext ack");
-          m_extAck.start();
-          m_ackMinTimer.stop();
-      }
-
-      m_ackDelayTimer.stop();
-      m_timeoutTimer.stop();
-      m_hangTimer.start();
-    }
-  }
-
-  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
-    sendCallsign();
-    m_callsignTimer.start();
-  }
-}
-
-void CFM::hangState(bool validRFSignal, bool validExtSignal)
-{
-  if (validRFSignal) {
-    io.setDecode(true);
-    io.setADCDetection(true);
-
-    DEBUG1("State to RELAYING_RF");
-    m_state = FS_RELAYING_RF;
-    DEBUG1("Stop ack");
-    m_rfAck.stop();
-    m_extAck.stop();
     beginRelaying();
-  } else if (validExtSignal) {
+
-    DEBUG1("State to RELAYING_EXT");
+    m_callsignTimer.start();
-    m_state = FS_RELAYING_EXT;
+    m_reverseTimer.stop();
+
+    io.setDecode(true);
+    io.setADCDetection(true);
+
+    DEBUG1("Change to STATE_FM");
+    m_modemState = STATE_FM;
+  }
+}
+
+void CFM::kerchunkState(bool validSignal)
+{
+  if (validSignal) {
+    if (m_kerchunkTimer.hasExpired()) {
+      DEBUG1("State to RELAYING");
+      m_state = FS_RELAYING;
+      m_kerchunkTimer.stop();
+      if (m_callsignAtStart && m_callsignAtLatch) {
+        sendCallsign();
+        m_callsignTimer.start();
+      }
+    }
+  } else {
+    io.setDecode(false);
+    io.setADCDetection(false);
+
+    DEBUG1("State to LISTENING");
+    m_state = FS_LISTENING;
+    m_kerchunkTimer.stop();
+    m_timeoutTimer.stop();
+    m_ackMinTimer.stop();
+    m_callsignTimer.stop();
+  }
+}
+
+void CFM::relayingState(bool validSignal)
+{
+  if (validSignal) {
+    if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired()) {
+      DEBUG1("State to TIMEOUT");
+      m_state = FS_TIMEOUT;
+      m_ackMinTimer.stop();
+      m_timeoutTimer.stop();
+      m_timeoutTone.start();
+    }
+  } else {
+    io.setDecode(false);
+    io.setADCDetection(false);
+
+    DEBUG1("State to RELAYING_WAIT");
+    m_state = FS_RELAYING_WAIT;
+    m_ackDelayTimer.start();
+  }
+
+  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
+    sendCallsign();
+    m_callsignTimer.start();
+  }
+}
+
+void CFM::relayingWaitState(bool validSignal)
+{
+  if (validSignal) {
+    io.setDecode(true);
+    io.setADCDetection(true);
+
+    DEBUG1("State to RELAYING");
+    m_state = FS_RELAYING;
+    m_ackDelayTimer.stop();
+  } else {
+    if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
+      DEBUG1("State to HANG");
+      m_state = FS_HANG;
+
+      if (m_ackMinTimer.isRunning()) {
+        if (m_ackMinTimer.hasExpired()) {
+          DEBUG1("Send ack");
+          m_rfAck.start();
+          m_ackMinTimer.stop();
+        }
+      } else {
+          DEBUG1("Send ack");
+          m_rfAck.start();
+          m_ackMinTimer.stop();
+      }
+
+      m_ackDelayTimer.stop();
+      m_timeoutTimer.stop();
+      m_hangTimer.start();
+    }
+  }
+
+  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
+    sendCallsign();
+    m_callsignTimer.start();
+  }
+}
+
+void CFM::hangState(bool validSignal)
+{
+  if (validSignal) {
+    io.setDecode(true);
+    io.setADCDetection(true);
+
+    DEBUG1("State to RELAYING");
+    m_state = FS_RELAYING;
     DEBUG1("Stop ack");
     m_rfAck.stop();
-    m_extAck.stop();
     beginRelaying();
   } else {
     if (m_hangTimer.isRunning() && m_hangTimer.hasExpired()) {
       DEBUG1("State to LISTENING");
       m_state = FS_LISTENING;
       m_hangTimer.stop();
-      m_statusTimer.stop();
 
       if (m_callsignAtEnd)
         sendCallsign();
 
       m_callsignTimer.stop();
-
     }
   }
 
@@ -643,18 +440,14 @@ void CFM::hangState(bool validRFSignal, bool validExtSignal)
   }
 }
 
-void CFM::timeoutRFState(bool validSignal)
+void CFM::timeoutState(bool validSignal)
 {
   if (!validSignal) {
     io.setDecode(false);
     io.setADCDetection(false);
 
-    DEBUG1("State to TIMEOUT_WAIT_RF");
+    DEBUG1("State to TIMEOUT_WAIT");
-    m_state = FS_TIMEOUT_WAIT_RF;
+    m_state = FS_TIMEOUT_WAIT;
-
-    if (m_callsignAtEnd)
-        sendCallsign();
-
     m_ackDelayTimer.start();
   }
 
@@ -664,21 +457,21 @@ void CFM::timeoutRFState(bool validSignal)
   }
 }
 
-void CFM::timeoutRFWaitState(bool validSignal)
+void CFM::timeoutWaitState(bool validSignal)
 {
   if (validSignal) {
     io.setDecode(true);
     io.setADCDetection(true);
 
-    DEBUG1("State to TIMEOUT_RF");
+    DEBUG1("State to TIMEOUT");
-    m_state = FS_TIMEOUT_RF;
+    m_state = FS_TIMEOUT;
     m_ackDelayTimer.stop();
   } else {
     if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
       DEBUG1("State to HANG");
       m_state = FS_HANG;
       m_timeoutTone.stop();
-      DEBUG1("Send RF ack");
+      DEBUG1("Send ack");
       m_rfAck.start();
       m_ackDelayTimer.stop();
       m_ackMinTimer.stop();
@@ -693,45 +486,6 @@ void CFM::timeoutRFWaitState(bool validSignal)
   }
 }
 
-void CFM::timeoutExtState(bool validSignal)
-{
-  if (!validSignal) {
-    DEBUG1("State to TIMEOUT_WAIT_EXT");
-    m_state = FS_TIMEOUT_WAIT_EXT;
-    m_ackDelayTimer.start();
-  }
-
-  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
-    sendCallsign();
-    m_callsignTimer.start();
-  }
-}
-
-void CFM::timeoutExtWaitState(bool validSignal)
-{
-  if (validSignal) {
-    DEBUG1("State to TIMEOUT_EXT");
-    m_state = FS_TIMEOUT_EXT;
-    m_ackDelayTimer.stop();
-  } else {
-    if (m_ackDelayTimer.isRunning() && m_ackDelayTimer.hasExpired()) {
-      DEBUG1("State to HANG");
-      m_state = FS_HANG;
-      m_timeoutTone.stop();
-      DEBUG1("Send Ext ack");
-      m_extAck.start();
-      m_ackDelayTimer.stop();
-      m_ackMinTimer.stop();
-      m_timeoutTimer.stop();
-      m_hangTimer.start();
-    }
-  }
-
-  if (m_callsignTimer.isRunning() && m_callsignTimer.hasExpired()) {
-    sendCallsign();
-    m_callsignTimer.start();
-  }
-}
 void CFM::sendCallsign()
 {
   if (m_holdoffTimer.isRunning()) {
@@ -752,25 +506,12 @@ void CFM::beginRelaying()
   m_ackMinTimer.start();
 }
 
-uint8_t CFM::getSpace() const
-{
-  // The amount of free space for receiving external audio, in frames.
-  return m_inputExtRB.getSpace() / FM_SERIAL_BLOCK_SIZE_BYTES;
-}
-
-uint8_t CFM::writeData(const uint8_t* data, uint8_t length)
-{
-  //todo check if length is a multiple of 3
-  m_inputExtRB.addData(data, length);
-  return 0U;
-}
-
 void CFM::insertDelay(uint16_t ms)
 {
   uint32_t nSamples = ms * 24U;
 
   for (uint32_t i = 0U; i < nSamples; i++)
-    m_inputRFRB.put(0);
+    m_inputRB.put(0);
 }
 
 void CFM::insertSilence(uint16_t ms)
@@ -778,5 +519,5 @@ void CFM::insertSilence(uint16_t ms)
   uint32_t nSamples = ms * 24U;
 
   for (uint32_t i = 0U; i < nSamples; i++)
-    m_outputRFRB.put(0);
+    m_outputRB.put(0);
 }

FM.h

@@ -27,32 +27,28 @@
 #include "FMTimeout.h"
 #include "FMKeyer.h"
 #include "FMTimer.h"
-#include "RingBuffer.h"
+#include "FMRB.h"
 #include "FMDirectForm1.h"
 #include "FMDownsampler.h"
-#include "FMUpSampler.h"
 
 enum FM_STATE {
   FS_LISTENING,
-  FS_KERCHUNK_RF,
+  FS_KERCHUNK,
-  FS_RELAYING_RF,
+  FS_RELAYING,
-  FS_RELAYING_WAIT_RF,
+  FS_RELAYING_WAIT,
-  FS_TIMEOUT_RF,
+  FS_TIMEOUT,
-  FS_TIMEOUT_WAIT_RF,
+  FS_TIMEOUT_WAIT,
-  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 samples(bool cos, const q15_t* samples, uint8_t length);
 
   void process();
 
@@ -60,17 +56,11 @@ public:
 
   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, bool kerchunkTX, uint8_t hangTime, bool useCOS, bool cosInvert, uint8_t rfAudioBoost, uint8_t maxDev, uint8_t rxLevel);
+  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, 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;
   CFMTimeout           m_timeoutTone;
@@ -82,39 +72,30 @@ private:
   CFMTimer             m_timeoutTimer;
   CFMTimer             m_holdoffTimer;
   CFMTimer             m_kerchunkTimer;
-  bool                 m_kerchunkTX;
   CFMTimer             m_ackMinTimer;
   CFMTimer             m_ackDelayTimer;
   CFMTimer             m_hangTimer;
-  CFMTimer             m_statusTimer;
+  CFMTimer             m_reverseTimer;
   CFMDirectFormI       m_filterStage1;
   CFMDirectFormI       m_filterStage2;
   CFMDirectFormI       m_filterStage3;
   CFMBlanking          m_blanking;
-  bool                 m_useCOS;
+  uint8_t              m_accessMode;
   bool                 m_cosInvert;
   q15_t                m_rfAudioBoost;
-  q15_t                m_extAudioBoost;
   CFMDownsampler       m_downsampler;
-  bool                 m_extEnabled;
   q15_t                m_rxLevel;
-  CRingBuffer<q15_t>   m_inputRFRB;
+  CFMRB                m_inputRB;
-  CRingBuffer<q15_t>   m_outputRFRB;
+  CFMRB                m_outputRB;
-  CFMUpSampler         m_inputExtRB;
 
-  void stateMachine(bool validRFSignal, bool validExtSignal);
+  void stateMachine(bool validSignal);
-  void listeningState(bool validRFSignal, bool validExtSignal);
+  void listeningState(bool validSignal);
-  void kerchunkRFState(bool validSignal);
+  void kerchunkState(bool validSignal);
-  void relayingRFState(bool validSignal);
+  void relayingState(bool validSignal);
-  void relayingRFWaitState(bool validSignal);
+  void relayingWaitState(bool validSignal);
-  void timeoutRFState(bool validSignal);
+  void timeoutState(bool validSignal);
-  void timeoutRFWaitState(bool validSignal);
+  void timeoutWaitState(bool validSignal);
-  void kerchunkExtState(bool validSignal);
+  void hangState(bool validSignal);
-  void relayingExtState(bool validSignal);
-  void relayingExtWaitState(bool validSignal);
-  void timeoutExtState(bool validSignal);
-  void timeoutExtWaitState(bool validSignal);
-  void hangState(bool validRFSignal, bool validExtSignal);
 
   void clock(uint8_t length);
 

FMCTCSSTX.cpp

@@ -115,11 +115,14 @@ uint8_t CFMCTCSSTX::setParams(uint8_t frequency, uint8_t level)
   return 0U;
 }
 
-q15_t CFMCTCSSTX::getAudio()
+q15_t CFMCTCSSTX::getAudio(bool reverse)
 {
   q15_t sample = m_values[m_n++];
-  if(m_n >= m_length)
+  if (m_n >= m_length)
     m_n = 0U;
   
-  return sample;
+  if (reverse)
+    return -sample;
+  else
+    return sample;
 }

FMCTCSSTX.h

@@ -27,7 +27,7 @@ public:
 
   uint8_t setParams(uint8_t frequency, uint8_t level);
 
-  q15_t getAudio();
+  q15_t getAudio(bool reverse);
 
 private:
   q15_t*   m_values;

FMDirectForm1.h

@@ -29,7 +29,7 @@ THE SOFTWARE.
 
 // based on https://raw.githubusercontent.com/berndporr/iir_fixed_point/master/DirectFormI.h
 
-#include <cstdint>
+#include "Globals.h"
 
 #ifndef DIRECTFORMI_H_
 #define DIRECTFORMI_H_

FMDownsampleRB.cpp

@@ -1,6 +1,5 @@
 /*
  *   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
@@ -17,19 +16,20 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include "RingBuffer.h"
 
-template <typename TDATATYPE> CRingBuffer<TDATATYPE>::CRingBuffer(uint16_t length) :
+#include "FMDownsampleRB.h"
+
+CFMDownsampleRB::CFMDownsampleRB(uint16_t length) :
 m_length(length),
 m_head(0U),
 m_tail(0U),
 m_full(false),
 m_overflow(false)
 {
-  m_buffer = new TDATATYPE[length];
+  m_samples = new uint8_t[length];
 }
 
-template <typename TDATATYPE> uint16_t CRingBuffer<TDATATYPE>::getSpace() const
+uint16_t CFMDownsampleRB::getSpace() const
 {
   uint16_t n = 0U;
 
@@ -46,7 +46,7 @@ template <typename TDATATYPE> uint16_t CRingBuffer<TDATATYPE>::getSpace() const
   return n;
 }
 
-template <typename TDATATYPE> uint16_t CRingBuffer<TDATATYPE>::getData() const
+uint16_t CFMDownsampleRB::getData() const
 {
   if (m_tail == m_head)
     return m_full ? m_length : 0U;
@@ -56,14 +56,14 @@ template <typename TDATATYPE> uint16_t CRingBuffer<TDATATYPE>::getData() const
     return m_length - m_tail + m_head;
 }
 
-template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::put(TDATATYPE item) volatile
+bool CFMDownsampleRB::put(uint8_t sample)
 {
   if (m_full) {
     m_overflow = true;
     return false;
   }
 
-  m_buffer[m_head] = item;
+  m_samples[m_head] = sample;
 
   m_head++;
   if (m_head >= m_length)
@@ -75,17 +75,12 @@ template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::put(TDATATYPE item) v
   return true;
 }
 
-template <typename TDATATYPE> TDATATYPE CRingBuffer<TDATATYPE>::peek() const
+bool CFMDownsampleRB::get(uint8_t& sample)
-{
-  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];
+  sample = m_samples[m_tail];
 
   m_full = false;
 
@@ -96,7 +91,7 @@ template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::get(TDATATYPE& item)
   return true;
 }
 
-template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::hasOverflowed()
+bool CFMDownsampleRB::hasOverflowed()
 {
   bool overflow = m_overflow;
 
@@ -104,11 +99,3 @@ template <typename TDATATYPE> bool CRingBuffer<TDATATYPE>::hasOverflowed()
 
   return overflow;
 }
-
-template <typename TDATATYPE> void CRingBuffer<TDATATYPE>::reset()
-{
-  m_head = 0U;
-  m_tail = 0U;
-  m_full     = false;
-  m_overflow = false;
-}

FMDownsampleRB.h

@@ -1,6 +1,5 @@
 /*
  *   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
@@ -17,8 +16,8 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#if !defined(RINGBUFFER_H)
+#if !defined(FMDOWNSAMPLERB_H)
-#define  RINGBUFFER_H
+#define  FMDOWNSAMPLERB_H
 
 #if defined(STM32F4XX)
 #include "stm32f4xx.h"
@@ -29,7 +28,6 @@
 #include <cstddef>
 #else
 #include <Arduino.h>
-#undef PI
 #endif
 
 #if defined(__SAM3X8E__) || defined(STM32F105xC)
@@ -44,34 +42,27 @@
 
 #include <arm_math.h>
 
-template <typename TDATATYPE>
+class CFMDownsampleRB {
-class CRingBuffer {
 public:
-  CRingBuffer(uint16_t length = 370U);
+  CFMDownsampleRB(uint16_t length);
   
   uint16_t getSpace() const;
   
   uint16_t getData() const;
 
-  bool put(TDATATYPE item) volatile;
+  bool put(uint8_t sample);
 
-  bool get(TDATATYPE& item) volatile;
+  bool get(uint8_t& sample);
-
-  TDATATYPE peek() const;
 
   bool hasOverflowed();
 
-  void reset();
-
 private:
-  uint16_t              m_length;
+  uint16_t          m_length;
-  TDATATYPE*            m_buffer;
+  volatile uint8_t* m_samples;
-  volatile uint16_t     m_head;
+  volatile uint16_t m_head;
-  volatile uint16_t     m_tail;
+  volatile uint16_t m_tail;
-  volatile bool         m_full;
+  volatile bool     m_full;
-  bool                  m_overflow;
+  bool              m_overflow;
 };
 
-#include "RingBuffer.impl.h"
+#endif
-
-#endif

FMDownsampler.cpp

@@ -20,55 +20,44 @@
 #include "Config.h"
 #include "FMDownsampler.h"
 
+
 CFMDownsampler::CFMDownsampler(uint16_t length) :
-m_ringBuffer(length),
+m_ringBuffer(length),//length might need tweaking
-m_samplePack(0U),
+m_packIndex(0),
-m_samplePackPointer(NULL),
+m_downSampleIndex(0)
-m_sampleIndex(0U)
 {
-  m_samplePackPointer = (uint8_t*)&m_samplePack;
+    m_samplePack = 0;
 }
 
 void CFMDownsampler::addSample(q15_t sample)
 {
-  uint32_t usample = uint32_t(int32_t(sample) + 2048);
+    //only take one of three samples
-  //only take one of three samples
+    if(m_downSampleIndex == 0) {
-  switch(m_sampleIndex){
+      switch(m_packIndex){
-    case 0:
+        case 0:
-      m_samplePack = usample << 12;
+          m_samplePack = int32_t(sample) << 12;
-    break;
+        break;
-    case 3:{
+        case 1:{
-      m_samplePack |= usample;
+            m_samplePack |= int32_t(sample);
-      
+            
-      //we did not use MSB; skip it
+            //we did not use MSB; skip it
-      TSamplePairPack pair{m_samplePackPointer[0U], m_samplePackPointer[1U], m_samplePackPointer[2U]}; 
+            m_ringBuffer.put(m_samplePackBytes[1]); 
+            m_ringBuffer.put(m_samplePackBytes[2]); 
+            m_ringBuffer.put(m_samplePackBytes[3]); 
 
-      m_ringBuffer.put(pair);
+            m_samplePack = 0;
-
+        }
-      m_samplePack = 0U;//reset the sample pack
+        break;
+        default:
+            //should never happen
+        break;
+        }
+        m_packIndex++;
+        if(m_packIndex >= 2)
+            m_packIndex = 0;  
     }
-    break;
-    default:
-        //Just skip this sample
-    break;
-  }
 
-  m_sampleIndex++;
+    m_downSampleIndex++;
-  if(m_sampleIndex >= 6U)//did we pack two samples ?
+    if(m_downSampleIndex >= 3)
-      m_sampleIndex = 0U;  
+        m_downSampleIndex = 0;
-}
-
-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

@@ -21,22 +21,23 @@
 #define FMDOWNSAMPLER_H
 
 #include "Config.h"
-#include "RingBuffer.h"
+#include "FMDownsampleRB.h"
-#include "FMSamplePairPack.h"
 
 class CFMDownsampler {
 public:
   CFMDownsampler(uint16_t length);
   void addSample(q15_t sample);
-  bool getPackedData(TSamplePairPack& data);
+  inline bool getPackedData(uint8_t& data){ return m_ringBuffer.get(data); };
-  uint16_t getData();
+  inline bool hasOverflowed() { return m_ringBuffer.hasOverflowed(); };
-  void reset();
 
 private:
-  CRingBuffer<TSamplePairPack> m_ringBuffer;
+  CFMDownsampleRB m_ringBuffer;
-  uint32_t                     m_samplePack;
+  union {
-  uint8_t*                     m_samplePackPointer;
+    int32_t m_samplePack;
-  uint8_t                      m_sampleIndex;
+    int8_t  m_samplePackBytes[4];
+  };
+  uint8_t m_packIndex;
+  uint8_t m_downSampleIndex;
 };
 
 #endif

FMRB.cpp

@@ -0,0 +1,110 @@
+/*
+TX fifo control - Copyright (C) KI6ZUM 2015
+Copyright (C) 2015,2016,2020 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 "FMRB.h"
+
+CFMRB::CFMRB(uint16_t length) :
+m_length(length),
+m_head(0U),
+m_tail(0U),
+m_full(false),
+m_overflow(false)
+{
+  m_samples = new q15_t[length];
+}
+
+uint16_t CFMRB::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 CFMRB::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 CFMRB::put(q15_t sample)
+{
+  if (m_full) {
+    m_overflow = true;
+    return false;
+  }
+
+  m_samples[m_head] = sample;
+
+  m_head++;
+  if (m_head >= m_length)
+    m_head = 0U;
+
+  if (m_head == m_tail)
+    m_full = true;
+
+  return true;
+}
+
+bool CFMRB::get(q15_t& sample)
+{
+  if (m_head == m_tail && !m_full)
+    return false;
+
+  sample = m_samples[m_tail];
+
+  m_full = false;
+
+  m_tail++;
+  if (m_tail >= m_length)
+    m_tail = 0U;
+
+  return true;
+}
+
+bool CFMRB::hasOverflowed()
+{
+  bool overflow = m_overflow;
+
+  m_overflow = false;
+
+  return overflow;
+}
+
+void CFMRB::reset()
+{
+  m_head = 0U;
+  m_tail = 0U;
+  m_full     = false;
+  m_overflow = false;
+}

FMRB.h

@@ -0,0 +1,72 @@
+/*
+Serial fifo control - Copyright (C) KI6ZUM 2015
+Copyright (C) 2015,2016,2020 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(FMRB_H)
+#define  FMRB_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
+
+#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>
+
+class CFMRB {
+public:
+  CFMRB(uint16_t length);
+  
+  uint16_t getSpace() const;
+  
+  uint16_t getData() const;
+
+  bool put(q15_t sample);
+
+  bool get(q15_t& sample);
+
+  bool hasOverflowed();
+
+  void reset();
+
+private:
+  uint16_t          m_length;
+  volatile q15_t*   m_samples;
+  volatile uint16_t m_head;
+  volatile uint16_t m_tail;
+  volatile bool     m_full;
+  bool              m_overflow;
+};
+
+#endif

FMTimeout.cpp

@@ -36,24 +36,22 @@ m_n(0U)
 
 void CFMTimeout::setParams(uint8_t level)
 {
-  m_level = q15_t(level * 128);
+  m_level = q15_t(level * 5);
 }
 
 q15_t CFMTimeout::getAudio()
 {
-  q15_t sample = 0U;
+  q15_t sample = 0;
   if (!m_running)
     return sample;
 
-  if (m_pos > 12000U) {
+  if (m_pos >= 12000U) {
-    q31_t sample = BUSY_AUDIO[m_n] * m_level;
+    q31_t sample31 = BUSY_AUDIO[m_n] * m_level;
-    sample = q15_t(__SSAT((sample >> 15), 16));
+    sample = q15_t(__SSAT((sample31 >> 15), 16));
 
     m_n++;
     if (m_n >= BUSY_AUDIO_LEN)
       m_n = 0U;
-  } else {
-    sample = 0U;
   }
 
   m_pos++;

FMUpSampler.cpp

@@ -1,97 +0,0 @@
-/*
- *   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);
-}

Globals.h

@@ -28,7 +28,6 @@
 #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)
@@ -52,6 +51,7 @@ enum MMDVM_STATE {
   STATE_NXDN      = 5,
   STATE_POCSAG    = 6,
   STATE_FM        = 10,
+  STATE_AX25      = 11,
 
   // Dummy states start at 90
   STATE_NXDNCAL1K = 91,
@@ -97,6 +97,8 @@ enum MMDVM_STATE {
 #include "CalPOCSAG.h"
 #include "CalRSSI.h"
 #include "CWIdTX.h"
+#include "AX25RX.h"
+#include "AX25TX.h"
 #include "Debug.h"
 #include "IO.h"
 #include "FM.h"
@@ -125,6 +127,7 @@ extern bool m_p25Enable;
 extern bool m_nxdnEnable;
 extern bool m_pocsagEnable;
 extern bool m_fmEnable;
+extern bool m_ax25Enable;
 
 extern bool m_duplex;
 
@@ -155,7 +158,9 @@ extern CNXDNTX nxdnTX;
 
 extern CPOCSAGTX pocsagTX;
 
-extern CFM fm;
+extern CFM     fm;
+extern CAX25RX ax25RX;
+extern CAX25TX ax25TX;
 
 extern CCalDStarRX calDStarRX;
 extern CCalDStarTX calDStarTX;
@@ -169,3 +174,4 @@ extern CCalRSSI    calRSSI;
 extern CCWIdTX cwIdTX;
 
 #endif
+

IO.cpp

@@ -81,8 +81,10 @@ 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),
@@ -256,15 +258,13 @@ 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) {
@@ -273,16 +273,15 @@ void CIO::process()
     uint16_t rssi[RX_BLOCK_SIZE];
 
     for (uint16_t i = 0U; i < RX_BLOCK_SIZE; i++) {
-      TSample sample;
+      uint16_t sample;
-      m_rxBuffer.get(sample);
+      m_rxBuffer.get(sample, control[i]);
-      control[i] = sample.control;
       m_rssiBuffer.get(rssi[i]);
 
       // Detect ADC overflow
-      if (m_detect && (sample.sample == 0U || sample.sample == 4095U))
+      if (m_detect && (sample == 0U || sample == 4095U))
         m_adcOverflow++;
 
-      q15_t res1 = q15_t(sample.sample) - m_rxDCOffset;
+      q15_t res1 = q15_t(sample) - m_rxDCOffset;
       q31_t res2 = res1 * m_rxLevel;
       samples[i] = q15_t(__SSAT((res2 >> 15), 16));
     }
@@ -364,6 +363,14 @@ void CIO::process()
         fm.samples(cos, dcSamples, RX_BLOCK_SIZE);
 #else
         fm.samples(cos, samples, RX_BLOCK_SIZE);
+#endif
+      }
+
+      if (m_ax25Enable) {
+#if defined(USE_DCBLOCKER)
+        ax25RX.samples(dcSamples, RX_BLOCK_SIZE);
+#else
+        ax25RX.samples(samples, RX_BLOCK_SIZE);
 #endif
       }
     } else if (m_modemState == STATE_DSTAR) {
@@ -428,8 +435,12 @@ void CIO::process()
       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];
@@ -454,7 +465,6 @@ 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;
@@ -480,6 +490,9 @@ void CIO::write(MMDVM_STATE mode, q15_t* samples, uint16_t length, const uint8_t
     case STATE_FM:
       txLevel = m_fmTXLevel;
       break;
+    case STATE_AX25:
+      txLevel = m_ax25TXLevel;
+      break;
     default:
       txLevel = m_cwIdTXLevel;
       break;
@@ -495,9 +508,9 @@ 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]);
   }
 }
 
@@ -532,7 +545,7 @@ void CIO::setMode()
 #endif
 }
 
-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, 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;
 
@@ -545,9 +558,12 @@ void CIO::setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rx
   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;

IO.h

@@ -21,12 +21,8 @@
 
 #include "Globals.h"
 
-#include "RingBuffer.h"
+#include "SampleRB.h"
-
+#include "RSSIRB.h"
-struct TSample {
-  volatile uint16_t sample;
-  volatile uint8_t control;
-};
 
 class CIO {
 public:
@@ -46,7 +42,7 @@ public:
   
   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 nxdnTXLevel, uint8_t pocsagTXLevel, uint8_t fmTXLevel, 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);
 
@@ -61,11 +57,11 @@ public:
   void selfTest();
 
 private:
-  bool                  m_started;
+  bool                 m_started;
 
-  CRingBuffer<TSample>  m_rxBuffer;
+  CSampleRB            m_rxBuffer;
-  CRingBuffer<TSample>  m_txBuffer;
+  CSampleRB            m_txBuffer;
-  CRingBuffer<uint16_t> m_rssiBuffer;
+  CRSSIRB              m_rssiBuffer;
 
   arm_biquad_casd_df1_inst_q31 m_dcFilter;
   q31_t                        m_dcState[4];
@@ -91,10 +87,13 @@ private:
   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;
 

IODue.cpp

@@ -185,13 +185,14 @@ 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
-    TSample sample = {DC_OFFSET, MARK_NONE};
+    uint8_t control = MARK_NONE;
+    uint16_t sample = DC_OFFSET;
 
-    m_txBuffer.get(sample);
+    m_txBuffer.get(sample, control);
-    DACC->DACC_CDR = sample.sample;
+    DACC->DACC_CDR = sample;
 
-    sample.sample = ADC->ADC_CDR[ADC_CDR_Chan];
+    sample = ADC->ADC_CDR[ADC_CDR_Chan];
-    m_rxBuffer.put(sample);
+    m_rxBuffer.put(sample, control);
 
 #if defined(SEND_RSSI_DATA)
     m_rssiBuffer.put(ADC->ADC_CDR[RSSI_CDR_Chan]);

IOPins.h

@@ -62,9 +62,12 @@
 #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
+#endif  //#ifndef _IO_PINS_H

IOSTM.cpp

@@ -326,24 +326,25 @@ void CIO::startInt()
 
 void CIO::interrupt()
 {
-   TSample sample = {DC_OFFSET, MARK_NONE};
+   uint8_t control  = MARK_NONE;
+   uint16_t sample  = DC_OFFSET;
    uint16_t rawRSSI = 0U;
 
-   m_txBuffer.get(sample);
+   m_txBuffer.get(sample, control);
 
    // Send the value to the DAC
 #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-   DAC_SetChannel2Data(DAC_Align_12b_R, sample.sample);
+   DAC_SetChannel2Data(DAC_Align_12b_R, sample);
 #else
-   DAC_SetChannel1Data(DAC_Align_12b_R, sample.sample);
+   DAC_SetChannel1Data(DAC_Align_12b_R, 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.sample  = 0U;
+      sample  = 0U;
    } else {
-      sample.sample  = ADC_GetConversionValue(ADC1);
+      sample  = ADC_GetConversionValue(ADC1);
 #if defined(SEND_RSSI_DATA)
       rawRSSI = ADC_GetConversionValue(ADC2);
 #endif
@@ -353,7 +354,7 @@ void CIO::interrupt()
    ADC_ClearFlag(ADC1, ADC_FLAG_EOC);
    ADC_SoftwareStartConv(ADC1);
 
-   m_rxBuffer.put(sample);
+   m_rxBuffer.put(sample, control);
    m_rssiBuffer.put(rawRSSI);
 
    m_watchdog++;

IOSTM_CMSIS.cpp

@@ -41,7 +41,6 @@ YSF      PB8    output
 P25      PB9    output
 NXDN     PB10   output
 POCSAG   PB11   output
-FM       PB12   output
 
 RX       PB0    analog input (ADC1_8)
 RSSI     PB1    analog input (ADC2_9)
@@ -85,9 +84,6 @@ USART1_RXD PA10  input (AF)
 #define PIN_POCSAG        11
 #define PORT_POCSAG       GPIOB
 #define BB_POCSAG         *((bitband_t)BITBAND_PERIPH(&PORT_POCSAG->ODR, PIN_POCSAG))
-#define PIN_FM            14
-#define PORT_FM           GPIOB
-#define BB_FM             *((bitband_t)BITBAND_PERIPH(&PORT_FM->ODR, PIN_FM))
 
 #define PIN_RX            0
 #define PIN_RX_ADC_CH     8
@@ -158,35 +154,16 @@ void GPIOConfigPin(GPIO_TypeDef *port_ptr, uint32_t pin, uint32_t mode_cnf_value
 #if defined(STM32F1_POG)
 void FancyLEDEffect()
 {
-  int ledCount = 10;
+  bitband_t foo[] = {&BB_LED, &BB_COSLED, &BB_PTT, &BB_DMR, &BB_DSTAR, &BB_YSF, &BB_P25};
-
+   
-  bitband_t foo[] = {&BB_LED, &BB_COSLED, &BB_PTT, &BB_DMR, &BB_DSTAR, &BB_YSF, &BB_P25,
+  for(int i=0; i<7; i++){
-#if defined(USE_ALTERNATE_NXDN_LEDS)
+    *foo[i] = 0x01;
-	NULL,
-#else
-	&BB_NXDN,
-#endif
-#if defined(USE_ALTERNATE_POCSAG_LEDS)
-	NULL,
-#else
-  	&BB_POCSAG,
-#endif
-#if defined(USE_ALTERNATE_FM_LEDS)
-	NULL};
-#else
-	&BB_FM};
-#endif
-
-  for(int i=0; i<ledCount; i++){
-    if(foo[i] != NULL)
-      *foo[i] = 0x01;
   }
   GPIOConfigPin(PORT_USART1_TXD, PIN_USART1_TXD, GPIO_CRL_MODE0_1);
   *((bitband_t)BITBAND_PERIPH(&PORT_USART1_TXD->ODR, PIN_USART1_TXD)) = 0x00;
   delay(SystemCoreClock/1000*100);
-  for(int i=0; i<ledCount; i++){
+  for(int i=0; i<7; i++){
-    if(foo[i] != NULL)
+    *foo[i] = 0x00;
-      *foo[i] = 0x00;
   }
   *((bitband_t)BITBAND_PERIPH(&PORT_USART1_TXD->ODR, PIN_USART1_TXD)) = 0x01;
   delay(SystemCoreClock/1000*20);
@@ -195,22 +172,18 @@ void FancyLEDEffect()
   *((bitband_t)BITBAND_PERIPH(&PORT_USART1_TXD->ODR, PIN_USART1_TXD)) = 0x01;
   
   *foo[0] = 0x01;
-  for(int i=1; i<ledCount; i++){
+  for(int i=1; i<7; i++){
     delay(SystemCoreClock/1000*10);
-    if (foo[i-1] != NULL)
+    *foo[i-1] = 0x00;
-      *foo[i-1] = 0x00;
+    *foo[i] = 0x01;
-    if (foo[i] != NULL)
-      *foo[i] = 0x01;
   }
-  for(int i=ledCount - 2; i>=0; i--) {
+  for(int i=5; i>=0; i--){
     delay(SystemCoreClock/1000*10);
-    if (foo[i+1] != NULL)
+    *foo[i+1] = 0x00;
-      *foo[i+1] = 0x00;
+    *foo[i] = 0x01;
-    if (foo[i] != NULL)
-      *foo[i] = 0x01;
   }
   delay(SystemCoreClock/1000*10);
-  *foo[0] = 0x00;
+  *foo[5+1-6] = 0x00;
   *((bitband_t)BITBAND_PERIPH(&PORT_USART1_TXD->ODR, PIN_USART1_TXD)) = 0x00;
   delay(SystemCoreClock/1000*10);
   *((bitband_t)BITBAND_PERIPH(&PORT_USART1_TXD->ODR, PIN_USART1_TXD)) = 0x01;
@@ -255,9 +228,6 @@ static inline void GPIOInit()
 #if !defined(USE_ALTERNATE_POCSAG_LEDS)
   GPIOConfigPin(PORT_POCSAG, PIN_POCSAG, GPIO_CRL_MODE0_1);
 #endif
-#if !defined(USE_ALTERNATE_FM_LEDS)
-  GPIOConfigPin(PORT_FM,     PIN_FM,     GPIO_CRL_MODE0_1);
-#endif
 
   GPIOConfigPin(PORT_RX, PIN_RX, 0);
 #if defined(SEND_RSSI_DATA)
@@ -397,7 +367,8 @@ void CIO::startInt()
 
 void CIO::interrupt()
 {
-  TSample sample = {DC_OFFSET, MARK_NONE};
+  uint8_t control  = MARK_NONE;
+  uint16_t sample  = DC_OFFSET;
 #if defined(SEND_RSSI_DATA)
   uint16_t rawRSSI = 0U;
 #endif
@@ -414,12 +385,12 @@ void CIO::interrupt()
     *rssi_adon = 1;
 #endif
     
-    m_txBuffer.get(sample);
+    m_txBuffer.get(sample, control);
-    DAC->DHR12R1 = sample.sample;  // Send the value to the DAC
+    DAC->DHR12R1 = sample;  // Send the value to the DAC
 
     // Read value from ADC1 and ADC2
-    sample.sample  = ADC1->DR;   // read conversion result; EOC is cleared by this read
+    sample  = ADC1->DR;   // read conversion result; EOC is cleared by this read
-    m_rxBuffer.put(sample);
+    m_rxBuffer.put(sample, control);
 #if defined(SEND_RSSI_DATA)
     rawRSSI = ADC2->DR;
     m_rssiBuffer.put(rawRSSI);
@@ -494,8 +465,6 @@ void CIO::setFMInt(bool on)
 #if defined(USE_ALTERNATE_FM_LEDS)
   BB_DSTAR = !!on;
   BB_YSF   = !!on;
-#else
-  BB_FM = !!on;
 #endif
 }
 

IOTeensy.cpp

@@ -161,14 +161,15 @@ void CIO::startInt()
 
 void CIO::interrupt()
 {
-   TSample sample = {DC_OFFSET, MARK_NONE};
+  uint8_t control = MARK_NONE;
+  uint16_t sample = DC_OFFSET;
 
-  m_txBuffer.get(sample);
+  m_txBuffer.get(sample, control);
-  *(int16_t *)&(DAC0_DAT0L) = sample.sample;
+  *(int16_t *)&(DAC0_DAT0L) = sample;
 
   if ((ADC0_SC1A & ADC_SC1_COCO) == ADC_SC1_COCO) {
-    sample.sample = ADC0_RA;
+    sample = ADC0_RA;
-    m_rxBuffer.put(sample);
+    m_rxBuffer.put(sample, control);
   }
     
 #if defined(SEND_RSSI_DATA)

MMDVM.cpp

@@ -33,6 +33,7 @@ bool m_p25Enable    = true;
 bool m_nxdnEnable   = true;
 bool m_pocsagEnable = true;
 bool m_fmEnable     = true;
+bool m_ax25Enable   = true;
 
 bool m_duplex = true;
 
@@ -61,6 +62,8 @@ CNXDNTX    nxdnTX;
 CPOCSAGTX  pocsagTX;
 
 CFM        fm;
+CAX25RX    ax25RX;
+CAX25TX    ax25TX;
 
 CCalDStarRX calDStarRX;
 CCalDStarTX calDStarTX;
@@ -110,6 +113,9 @@ void loop()
   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();
 

MMDVM.ino

@@ -30,6 +30,7 @@ bool m_p25Enable    = true;
 bool m_nxdnEnable   = true;
 bool m_pocsagEnable = true;
 bool m_fmEnable     = true;
+bool m_ax25Enable   = true;
 
 bool m_duplex = true;
 
@@ -58,6 +59,8 @@ CNXDNTX    nxdnTX;
 CPOCSAGTX  pocsagTX;
 
 CFM        fm;
+CAX25RX    ax25RX;
+CAX25      ax25TX;
 
 CCalDStarRX calDStarRX;
 CCalDStarTX calDStarTX;
@@ -107,6 +110,9 @@ void loop()
   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();
 

Makefile

@@ -139,6 +139,10 @@ DEFS_DVM=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F446xx -DSTM32F4_DVM -DHSE_VA
 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
@@ -155,7 +159,7 @@ 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 dvm drcc_nqf clean
@@ -229,6 +233,18 @@ 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)
@@ -350,6 +366,8 @@ 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),)

Makefile.Arduino

@@ -1,5 +1,5 @@
 #!/usr/bin/make
-# makefile for the arduino due (works with arduino IDE 1.6.12)
+# makefile for the arduino due (works with arduino IDE 1.6.11)
 #
 # 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/1.6.12
+SAM:=$(ADIR)/packages/arduino/hardware/sam/1.6.11
 #CMSIS:=arduino/sam/system/CMSIS/
 #LIBSAM:=arduino/sam/system/libsam
 TMPDIR:=$(PWD)/build

NXDNTX.cpp

@@ -81,8 +81,7 @@ 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 = 0U;
+        uint8_t c = m_buffer.get();
-        m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
     }
@@ -123,7 +122,7 @@ void CNXDNTX::process()
   }
 }
 
-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;

NXDNTX.h

@@ -21,13 +21,13 @@
 
 #include "Config.h"
 
-#include "RingBuffer.h"
+#include "SerialRB.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();
 
@@ -38,7 +38,7 @@ public:
   void setParams(uint8_t txHang);
 
 private:
-  CRingBuffer<uint8_t>                        m_buffer;
+  CSerialRB                        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

P25TX.cpp

@@ -75,11 +75,9 @@ void CP25TX::process()
       for (uint16_t i = 0U; i < m_txDelay; i++)
         m_poBuffer[m_poLen++] = P25_START_SYNC;
     } else {
-      uint8_t length;
+      uint8_t length = m_buffer.get();
-      m_buffer.get(length);
       for (uint8_t i = 0U; i < length; i++) {
-        uint8_t c = 0U;
+        uint8_t c = m_buffer.get();
-        m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
     }
@@ -120,7 +118,7 @@ void CP25TX::process()
   }
 }
 
-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;

P25TX.h

@@ -21,13 +21,13 @@
 
 #include "Config.h"
 
-#include "RingBuffer.h"
+#include "SerialRB.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();
 
@@ -38,7 +38,7 @@ public:
   void setParams(uint8_t txHang);
 
 private:
-  CRingBuffer<uint8_t>                        m_buffer;
+  CSerialRB                        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

POCSAGTX.cpp

@@ -61,8 +61,7 @@ void CPOCSAGTX::process()
         m_poBuffer[m_poLen++] = POCSAG_SYNC;
     } else {
       for (uint8_t i = 0U; i < POCSAG_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c = 0U;
+        uint8_t c = m_buffer.get();
-        m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
     }
@@ -96,7 +95,7 @@ bool CPOCSAGTX::busy()
     return false;
 }
 
-uint8_t CPOCSAGTX::writeData(const uint8_t* data, uint8_t length)
+uint8_t CPOCSAGTX::writeData(const uint8_t* data, uint16_t length)
 {
   if (length != POCSAG_FRAME_LENGTH_BYTES)
     return 4U;
@@ -147,3 +146,4 @@ uint8_t CPOCSAGTX::getSpace() const
 {
   return m_buffer.getSpace() / POCSAG_FRAME_LENGTH_BYTES;
 }
+

POCSAGTX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015-2019 by Jonathan Naylor G4KLX
+ *   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
@@ -21,13 +21,13 @@
 
 #include "Config.h"
 
-#include "RingBuffer.h"
+#include "SerialRB.h"
 
 class CPOCSAGTX {
 public:
   CPOCSAGTX();
 
-  uint8_t writeData(const uint8_t* data, uint8_t length);
+  uint8_t writeData(const uint8_t* data, uint16_t length);
 
   void writeByte(uint8_t c);
 
@@ -40,7 +40,7 @@ public:
   bool busy();
 
 private:
-  CRingBuffer<uint8_t>            m_buffer;
+  CSerialRB            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];

README.md

@@ -1,7 +1,17 @@
-This is the source code of the MMDVM firmware that supports D-Star, DMR, System Fusion, P25, NXDN, and POCSAG 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 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 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.
+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 uses 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

@@ -0,0 +1,102 @@
+/*
+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_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

@@ -0,0 +1,59 @@
+/*
+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
+

STMUART.cpp

@@ -1,100 +0,0 @@
-/*
- *   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

@@ -1,91 +0,0 @@
-/*
- *   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

@@ -0,0 +1,106 @@
+/*
+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_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

@@ -0,0 +1,60 @@
+/*
+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
+

SerialPort.cpp

@@ -65,13 +65,11 @@ const uint8_t MMDVM_NXDN_LOST    = 0x41U;
 
 const uint8_t MMDVM_POCSAG_DATA  = 0x50U;
 
+const uint8_t MMDVM_AX25_DATA    = 0x55U;
+
 const uint8_t MMDVM_FM_PARAMS1   = 0x60U;
 const uint8_t MMDVM_FM_PARAMS2   = 0x61U;
 const uint8_t MMDVM_FM_PARAMS3   = 0x62U;
-const uint8_t MMDVM_FM_PARAMS4   = 0x63U;
-const uint8_t MMDVM_FM_DATA      = 0x65U;
-const uint8_t MMDVM_FM_STATUS    = 0x66U;
-const uint8_t MMDVM_FM_EOT       = 0x67U;
 
 const uint8_t MMDVM_ACK          = 0x70U;
 const uint8_t MMDVM_NAK          = 0x7FU;
@@ -107,7 +105,7 @@ const uint8_t MMDVM_DEBUG5       = 0xF5U;
 #define	HW_TYPE	"MMDVM"
 #endif
 
-#define DESCRIPTION "20200620 (D-Star/DMR/System Fusion/P25/NXDN/POCSAG/FM)"
+#define DESCRIPTION "20200714 (D-Star/DMR/System Fusion/P25/NXDN/POCSAG/FM/AX.25)"
 
 #if defined(GITVERSION)
 #define concat(h, a, b, c) h " " a " " b " GitID #" c ""
@@ -162,7 +160,7 @@ void CSerialPort::getStatus()
 
   // Send all sorts of interesting internal values
   reply[0U]  = MMDVM_FRAME_START;
-  reply[1U]  = 14U;
+  reply[1U]  = 13U;
   reply[2U]  = MMDVM_GET_STATUS;
 
   reply[3U]  = 0x00U;
@@ -180,6 +178,8 @@ void CSerialPort::getStatus()
     reply[3U] |= 0x20U;
   if (m_fmEnable)
     reply[3U] |= 0x40U;
+  if (m_ax25Enable)
+    reply[3U] |= 0x80U;
 
   reply[4U]  = uint8_t(m_modemState);
 
@@ -244,8 +244,8 @@ void CSerialPort::getStatus()
   else
     reply[12U] = 0U;
 
-  if (m_fmEnable)
+  if (m_ax25Enable)
-    reply[13U] = fm.getSpace();
+    reply[13U] = ax25TX.getSpace();
   else
     reply[13U] = 0U;
 
@@ -271,16 +271,17 @@ void CSerialPort::getVersion()
   writeInt(1U, reply, count);
 }
 
-uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
+uint8_t CSerialPort::setConfig(const uint8_t* data, uint16_t length)
 {
-  if (length < 21U)
+  if (length < 24U)
     return 4U;
 
-  bool rxInvert  = (data[0U] & 0x01U) == 0x01U;
+  bool rxInvert        = (data[0U] & 0x01U) == 0x01U;
-  bool txInvert  = (data[0U] & 0x02U) == 0x02U;
+  bool txInvert        = (data[0U] & 0x02U) == 0x02U;
-  bool pttInvert = (data[0U] & 0x04U) == 0x04U;
+  bool pttInvert       = (data[0U] & 0x04U) == 0x04U;
-  bool ysfLoDev  = (data[0U] & 0x08U) == 0x08U;
+  bool ysfLoDev        = (data[0U] & 0x08U) == 0x08U;
-  bool simplex   = (data[0U] & 0x80U) == 0x80U;
+  bool useCOSAsLockout = (data[0U] & 0x20U) == 0x20U;
+  bool simplex         = (data[0U] & 0x80U) == 0x80U;
 
   m_debug = (data[0U] & 0x10U) == 0x10U;
 
@@ -291,6 +292,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   bool nxdnEnable   = (data[1U] & 0x10U) == 0x10U;
   bool pocsagEnable = (data[1U] & 0x20U) == 0x20U;
   bool fmEnable     = (data[1U] & 0x40U) == 0x40U;
+  bool ax25Enable   = (data[1U] & 0x80U) == 0x80U;
 
   uint8_t txDelay = data[2U];
   if (txDelay > 50U)
@@ -344,6 +346,16 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
 
   uint8_t nxdnTXHang    = data[20U];
 
+  uint8_t ax25TXLevel   = data[21U];
+
+  int8_t ax25RXTwist    = int8_t(data[22U]) - 128;
+  if (ax25RXTwist < -4 || ax25RXTwist > 10)
+    return 4U;
+
+  int8_t ax25TXTwist    = int8_t(data[23U]) - 128;
+  if (ax25TXTwist < -4 || ax25TXTwist > 10)
+    return 4U;
+
   setMode(modemState);
 
   m_dstarEnable  = dstarEnable;
@@ -353,6 +365,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   m_nxdnEnable   = nxdnEnable;
   m_pocsagEnable = pocsagEnable;
   m_fmEnable     = fmEnable;
+  m_ax25Enable   = ax25Enable;
   m_duplex       = !simplex;
 
   dstarTX.setTXDelay(txDelay);
@@ -361,6 +374,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   dmrDMOTX.setTXDelay(txDelay);
   nxdnTX.setTXDelay(txDelay);
   pocsagTX.setTXDelay(txDelay);
+  ax25TX.setTXDelay(txDelay);
 
   dmrTX.setColorCode(colorCode);
   dmrRX.setColorCode(colorCode);
@@ -371,15 +385,17 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   ysfTX.setParams(ysfLoDev, ysfTXHang);
   p25TX.setParams(p25TXHang);
   nxdnTX.setParams(nxdnTXHang);
+  ax25RX.setParams(ax25RXTwist);
+  ax25TX.setParams(ax25TXTwist);
 
-  io.setParameters(rxInvert, txInvert, pttInvert, rxLevel, cwIdTXLevel, dstarTXLevel, dmrTXLevel, ysfTXLevel, p25TXLevel, nxdnTXLevel, pocsagTXLevel, fmTXLevel, txDCOffset, rxDCOffset);
+  io.setParameters(rxInvert, txInvert, pttInvert, rxLevel, cwIdTXLevel, dstarTXLevel, dmrTXLevel, ysfTXLevel, p25TXLevel, nxdnTXLevel, pocsagTXLevel, fmTXLevel, ax25TXLevel, txDCOffset, rxDCOffset, useCOSAsLockout);
 
   io.start();
 
   return 0U;
 }
 
-uint8_t CSerialPort::setFMParams1(const uint8_t* data, uint8_t length)
+uint8_t CSerialPort::setFMParams1(const uint8_t* data, uint16_t length)
 {
   if (length < 8U)
     return 4U;
@@ -404,7 +420,7 @@ uint8_t CSerialPort::setFMParams1(const uint8_t* data, uint8_t length)
   return fm.setCallsign(callsign, speed, frequency, time, holdoff, highLevel, lowLevel, callAtStart, callAtEnd, callAtLatch);
 }
 
-uint8_t CSerialPort::setFMParams2(const uint8_t* data, uint8_t length)
+uint8_t CSerialPort::setFMParams2(const uint8_t* data, uint16_t length)
 {
   if (length < 6U)
     return 4U;
@@ -424,7 +440,7 @@ uint8_t CSerialPort::setFMParams2(const uint8_t* data, uint8_t length)
   return fm.setAck(ack, speed, frequency, minTime, delay, level);
 }
 
-uint8_t CSerialPort::setFMParams3(const uint8_t* data, uint8_t length)
+uint8_t CSerialPort::setFMParams3(const uint8_t* data, uint16_t length)
 {
   if (length < 12U)
     return 4U;
@@ -440,37 +456,17 @@ uint8_t CSerialPort::setFMParams3(const uint8_t* data, uint8_t length)
   uint8_t  kerchunkTime   = data[6U];
   uint8_t  hangTime       = data[7U];
 
-  bool     useCOS         = (data[8U] & 0x01U) == 0x01U;
+  uint8_t  accessMode     = data[8U] & 0x7FU;
-  bool     cosInvert      = (data[8U] & 0x02U) == 0x02U;
+  bool     cosInvert      = (data[8U] & 0x80U) == 0x80U;
-  bool     kerchunkTX     = (data[8U] & 0x04U) == 0x04U;
 
   uint8_t  rfAudioBoost   = data[9U];
   uint8_t  maxDev         = data[10U];
   uint8_t  rxLevel        = data[11U];
 
-  return fm.setMisc(timeout, timeoutLevel, ctcssFrequency, ctcssHighThreshold, ctcssLowThreshold, ctcssLevel, kerchunkTime, kerchunkTX, hangTime, useCOS, cosInvert, rfAudioBoost, maxDev, rxLevel);
+  return fm.setMisc(timeout, timeoutLevel, ctcssFrequency, ctcssHighThreshold, ctcssLowThreshold, ctcssLevel, kerchunkTime, hangTime, accessMode, cosInvert, rfAudioBoost, maxDev, rxLevel);
 }
 
-uint8_t CSerialPort::setFMParams4(const uint8_t* data, uint8_t length)
+uint8_t CSerialPort::setMode(const uint8_t* data, uint16_t length)
-{
-  if (length < 4U)
-    return 4U;
-
-  uint8_t  audioBoost = data[0U];
-  uint8_t  speed      = data[1U];
-  uint16_t frequency  = data[2U] * 10U;
-  uint8_t  level      = data[3U];
-
-  char ack[50U];
-  uint8_t n = 0U;
-  for (uint8_t i = 4U; i < length; i++, n++)
-    ack[n] = data[i];
-  ack[n] = '\0';
-
-  return fm.setExt(ack, audioBoost, speed, frequency, level);
-}
-
-uint8_t CSerialPort::setMode(const uint8_t* data, uint8_t length)
 {
   if (length < 1U)
     return 4U;
@@ -603,7 +599,7 @@ void CSerialPort::setMode(MMDVM_STATE modemState)
 
 void CSerialPort::start()
 {
-  beginInt(1U, SERIAL_SPEED);
+  beginInt(1U, 115200);
 
 #if defined(SERIAL_REPEATER)
   beginInt(3U, 9600);
@@ -621,15 +617,25 @@ void CSerialPort::process()
         m_buffer[0U] = c;
         m_ptr = 1U;
         m_len = 0U;
-      }
+      } else {
-      else {
         m_ptr = 0U;
         m_len = 0U;
       }
     } else if (m_ptr == 1U) {
-      // Handle the frame length
+      // Handle the frame length, 1/2
       m_len = m_buffer[m_ptr] = c;
       m_ptr = 2U;
+    } else if (m_ptr == 2U) {
+      // Handle the frame length, 2/2
+      m_buffer[m_ptr] = c;
+      m_ptr = 3U;
+
+      if (m_len == 0U)
+        m_len = c + 255U;
+
+      // The full packet has been received, process it
+      if (m_ptr == m_len)
+        processMessage(m_buffer + 3U, m_len - 3U);
     } else {
       // Any other bytes are added to the buffer
       m_buffer[m_ptr] = c;
@@ -637,328 +643,10 @@ void CSerialPort::process()
 
       // The full packet has been received, process it
       if (m_ptr == m_len) {
-        uint8_t err = 2U;
+        if (m_len > 255U)
-
+          processMessage(m_buffer + 4U, m_len - 4U);
-        switch (m_buffer[2U]) {
+        else
-          case MMDVM_GET_STATUS:
+          processMessage(m_buffer + 3U, m_len - 3U);
-            getStatus();
-            break;
-
-          case MMDVM_GET_VERSION:
-            getVersion();
-            break;
-
-          case MMDVM_SET_CONFIG:
-            err = setConfig(m_buffer + 3U, m_len - 3U);
-            if (err == 0U)
-              sendACK();
-            else
-              sendNAK(err);
-            break;
-
-          case MMDVM_SET_MODE:
-            err = setMode(m_buffer + 3U, m_len - 3U);
-            if (err == 0U)
-              sendACK();
-            else
-              sendNAK(err);
-            break;
-
-          case MMDVM_SET_FREQ:
-            sendACK();
-            break;
-
-          case MMDVM_FM_PARAMS1:
-            err = setFMParams1(m_buffer + 3U, m_len - 3U);
-            if (err == 0U) {
-              sendACK();
-            } else {
-              DEBUG2("Received invalid FM params 1", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_FM_PARAMS2:
-            err = setFMParams2(m_buffer + 3U, m_len - 3U);
-            if (err == 0U) {
-              sendACK();
-            } else {
-              DEBUG2("Received invalid FM params 2", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_FM_PARAMS3:
-            err = setFMParams3(m_buffer + 3U, m_len - 3U);
-            if (err == 0U) {
-              sendACK();
-            } else {
-              DEBUG2("Received invalid FM params 3", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_FM_PARAMS4:
-            err = setFMParams4(m_buffer + 3U, m_len - 3U);
-            if (err == 0U) {
-              sendACK();
-            } else {
-              DEBUG2("Received invalid FM params 4", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_CAL_DATA:
-            if (m_modemState == STATE_DSTARCAL)
-              err = calDStarTX.write(m_buffer + 3U, m_len - 3U);
-            if (m_modemState == STATE_DMRCAL || m_modemState == STATE_LFCAL || m_modemState == STATE_DMRCAL1K || m_modemState == STATE_DMRDMO1K)
-              err = calDMR.write(m_buffer + 3U, m_len - 3U);
-            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)
-              err = calFM.write(m_buffer + 3U, m_len - 3U);
-            if (m_modemState == STATE_P25CAL1K)
-              err = calP25.write(m_buffer + 3U, m_len - 3U);
-            if (m_modemState == STATE_NXDNCAL1K)
-              err = calNXDN.write(m_buffer + 3U, m_len - 3U);
-            if (m_modemState == STATE_POCSAGCAL)
-              err = calPOCSAG.write(m_buffer + 3U, m_len - 3U);
-            if (err == 0U) {
-              sendACK();
-            } else {
-              DEBUG2("Received invalid calibration data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_SEND_CWID:
-            err = 5U;
-            if (m_modemState == STATE_IDLE)
-              err = cwIdTX.write(m_buffer + 3U, m_len - 3U);
-            if (err != 0U) {
-              DEBUG2("Invalid CW Id data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DSTAR_HEADER:
-            if (m_dstarEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_DSTAR)
-                err = dstarTX.writeHeader(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_DSTAR);
-            } else {
-              DEBUG2("Received invalid D-Star header", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DSTAR_DATA:
-            if (m_dstarEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_DSTAR)
-                err = dstarTX.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_DSTAR);
-            } else {
-              DEBUG2("Received invalid D-Star data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DSTAR_EOT:
-            if (m_dstarEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_DSTAR)
-                err = dstarTX.writeEOT();
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_DSTAR);
-            } else {
-              DEBUG2("Received invalid D-Star EOT", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DMR_DATA1:
-            if (m_dmrEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_DMR) {
-                if (m_duplex)
-                  err = dmrTX.writeData1(m_buffer + 3U, m_len - 3U);
-              }
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_DMR);
-            } else {
-              DEBUG2("Received invalid DMR data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DMR_DATA2:
-            if (m_dmrEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_DMR) {
-                if (m_duplex)
-                  err = dmrTX.writeData2(m_buffer + 3U, m_len - 3U);
-                else
-                  err = dmrDMOTX.writeData(m_buffer + 3U, m_len - 3U);
-              }
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_DMR);
-            } else {
-              DEBUG2("Received invalid DMR data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DMR_START:
-            if (m_dmrEnable) {
-              err = 4U;
-              if (m_len == 4U) {
-                if (m_buffer[3U] == 0x01U && m_modemState == STATE_DMR) {
-                  if (!m_tx)
-                    dmrTX.setStart(true);
-                  err = 0U;
-                } else if (m_buffer[3U] == 0x00U && m_modemState == STATE_DMR) {
-                  if (m_tx)
-                    dmrTX.setStart(false);
-                  err = 0U;
-                }
-              }
-            }
-            if (err != 0U) {
-              DEBUG2("Received invalid DMR start", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DMR_SHORTLC:
-            if (m_dmrEnable)
-              err = dmrTX.writeShortLC(m_buffer + 3U, m_len - 3U);
-            if (err != 0U) {
-              DEBUG2("Received invalid DMR Short LC", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_DMR_ABORT:
-            if (m_dmrEnable)
-              err = dmrTX.writeAbort(m_buffer + 3U, m_len - 3U);
-            if (err != 0U) {
-              DEBUG2("Received invalid DMR Abort", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_YSF_DATA:
-            if (m_ysfEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_YSF)
-                err = ysfTX.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_YSF);
-            } else {
-              DEBUG2("Received invalid System Fusion data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_P25_HDR:
-            if (m_p25Enable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
-                err = p25TX.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_P25);
-            } else {
-              DEBUG2("Received invalid P25 header", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_P25_LDU:
-            if (m_p25Enable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
-                err = p25TX.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_P25);
-            } else {
-              DEBUG2("Received invalid P25 LDU", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_NXDN_DATA:
-            if (m_nxdnEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_NXDN)
-                err = nxdnTX.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_NXDN);
-            } else {
-              DEBUG2("Received invalid NXDN data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_POCSAG_DATA:
-            if (m_pocsagEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_POCSAG)
-                err = pocsagTX.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_POCSAG);
-            } else {
-              DEBUG2("Received invalid POCSAG data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_FM_DATA:
-            if (m_fmEnable) {
-              if (m_modemState == STATE_IDLE || m_modemState == STATE_FM)
-                err = fm.writeData(m_buffer + 3U, m_len - 3U);
-            }
-            if (err == 0U) {
-              if (m_modemState == STATE_IDLE)
-                setMode(STATE_FM);
-            } else {
-              DEBUG2("Received invalid FM data", err);
-              sendNAK(err);
-            }
-            break;
-
-          case MMDVM_TRANSPARENT:
-          case MMDVM_QSO_INFO:
-            // Do nothing on the MMDVM.
-            break;
-
-#if defined(SERIAL_REPEATER)
-          case MMDVM_SERIAL: {
-            for (uint8_t i = 3U; i < m_len; i++)
-              m_repeat.put(m_buffer[i]);
-            }
-            break;
-#endif
-
-          default:
-            // Handle this, send a NAK back
-            sendNAK(1U);
-            break;
-        }
-
-        m_ptr = 0U;
-        m_len = 0U;
       }
     }
   }
@@ -988,6 +676,319 @@ void CSerialPort::process()
 #endif
 }
 
+void CSerialPort::processMessage(const uint8_t* buffer, uint16_t length)
+{
+  uint8_t err = 2U;
+
+  switch (m_buffer[2U]) {
+    case MMDVM_GET_STATUS:
+      getStatus();
+      break;
+
+    case MMDVM_GET_VERSION:
+      getVersion();
+      break;
+
+    case MMDVM_SET_CONFIG:
+      err = setConfig(buffer, length);
+      if (err == 0U)
+        sendACK();
+      else
+        sendNAK(err);
+      break;
+
+    case MMDVM_SET_MODE:
+      err = setMode(buffer, length);
+      if (err == 0U)
+        sendACK();
+      else
+        sendNAK(err);
+      break;
+
+    case MMDVM_SET_FREQ:
+      sendACK();
+      break;
+
+    case MMDVM_FM_PARAMS1:
+      err = setFMParams1(buffer, length);
+      if (err == 0U) {
+        sendACK();
+      } else {
+        DEBUG2("Received invalid FM params 1", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_FM_PARAMS2:
+      err = setFMParams2(buffer, length);
+      if (err == 0U) {
+        sendACK();
+      } else {
+        DEBUG2("Received invalid FM params 2", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_FM_PARAMS3:
+      err = setFMParams3(buffer, length);
+      if (err == 0U) {
+        sendACK();
+      } else {
+        DEBUG2("Received invalid FM params 3", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_CAL_DATA:
+      if (m_modemState == STATE_DSTARCAL)
+        err = calDStarTX.write(buffer, length);
+      if (m_modemState == STATE_DMRCAL || m_modemState == STATE_LFCAL || m_modemState == STATE_DMRCAL1K || m_modemState == STATE_DMRDMO1K)
+        err = calDMR.write(buffer, length);
+      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)
+        err = calFM.write(buffer, length);
+      if (m_modemState == STATE_P25CAL1K)
+        err = calP25.write(buffer, length);
+      if (m_modemState == STATE_NXDNCAL1K)
+        err = calNXDN.write(buffer, length);
+      if (m_modemState == STATE_POCSAGCAL)
+        err = calPOCSAG.write(buffer, length);
+      if (err == 0U) {
+        sendACK();
+      } else {
+        DEBUG2("Received invalid calibration data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_SEND_CWID:
+      err = 5U;
+      if (m_modemState == STATE_IDLE)
+        err = cwIdTX.write(buffer, length);
+      if (err != 0U) {
+        DEBUG2("Invalid CW Id data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DSTAR_HEADER:
+      if (m_dstarEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_DSTAR)
+          err = dstarTX.writeHeader(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_DSTAR);
+      } else {
+        DEBUG2("Received invalid D-Star header", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DSTAR_DATA:
+      if (m_dstarEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_DSTAR)
+          err = dstarTX.writeData(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_DSTAR);
+      } else {
+        DEBUG2("Received invalid D-Star data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DSTAR_EOT:
+      if (m_dstarEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_DSTAR)
+          err = dstarTX.writeEOT();
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_DSTAR);
+      } else {
+        DEBUG2("Received invalid D-Star EOT", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DMR_DATA1:
+      if (m_dmrEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_DMR) {
+          if (m_duplex)
+            err = dmrTX.writeData1(buffer, length);
+        }
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_DMR);
+      } else {
+        DEBUG2("Received invalid DMR data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DMR_DATA2:
+      if (m_dmrEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_DMR) {
+          if (m_duplex)
+            err = dmrTX.writeData2(buffer, length);
+          else
+            err = dmrDMOTX.writeData(buffer, length);
+        }
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_DMR);
+      } else {
+        DEBUG2("Received invalid DMR data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DMR_START:
+      if (m_dmrEnable) {
+        err = 4U;
+        if (m_len == 4U) {
+          if (m_buffer[3U] == 0x01U && m_modemState == STATE_DMR) {
+            if (!m_tx)
+              dmrTX.setStart(true);
+            err = 0U;
+          } else if (m_buffer[3U] == 0x00U && m_modemState == STATE_DMR) {
+            if (m_tx)
+              dmrTX.setStart(false);
+            err = 0U;
+          }
+        }
+      }
+      if (err != 0U) {
+        DEBUG2("Received invalid DMR start", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DMR_SHORTLC:
+      if (m_dmrEnable)
+        err = dmrTX.writeShortLC(buffer, length);
+      if (err != 0U) {
+        DEBUG2("Received invalid DMR Short LC", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_DMR_ABORT:
+      if (m_dmrEnable)
+        err = dmrTX.writeAbort(buffer, length);
+      if (err != 0U) {
+        DEBUG2("Received invalid DMR Abort", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_YSF_DATA:
+      if (m_ysfEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_YSF)
+          err = ysfTX.writeData(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_YSF);
+      } else {
+        DEBUG2("Received invalid System Fusion data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_P25_HDR:
+      if (m_p25Enable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
+          err = p25TX.writeData(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_P25);
+      } else {
+        DEBUG2("Received invalid P25 header", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_P25_LDU:
+      if (m_p25Enable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
+          err = p25TX.writeData(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_P25);
+      } else {
+        DEBUG2("Received invalid P25 LDU", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_NXDN_DATA:
+      if (m_nxdnEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_NXDN)
+          err = nxdnTX.writeData(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_NXDN);
+      } else {
+        DEBUG2("Received invalid NXDN data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_POCSAG_DATA:
+      if (m_pocsagEnable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_POCSAG)
+          err = pocsagTX.writeData(buffer, length);
+      }
+      if (err == 0U) {
+        if (m_modemState == STATE_IDLE)
+          setMode(STATE_POCSAG);
+      } else {
+        DEBUG2("Received invalid POCSAG data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_AX25_DATA:
+      if (m_ax25Enable) {
+        if (m_modemState == STATE_IDLE || m_modemState == STATE_FM)
+          err = ax25TX.writeData(buffer, length);
+      }
+      if (err != 0U) {
+        DEBUG2("Received invalid AX.25 data", err);
+        sendNAK(err);
+      }
+      break;
+
+    case MMDVM_TRANSPARENT:
+    case MMDVM_QSO_INFO:
+      // Do nothing on the MMDVM.
+      break;
+
+#if defined(SERIAL_REPEATER)
+    case MMDVM_SERIAL: {
+      for (uint8_t i = 3U; i < m_len; i++)
+        m_repeat.put(m_buffer[i]);
+      }
+      break;
+#endif
+
+    default:
+      // Handle this, send a NAK back
+      sendNAK(1U);
+      break;
+  }
+
+  m_ptr = 0U;
+  m_len = 0U;
+}
+
 void CSerialPort::writeDStarHeader(const uint8_t* header, uint8_t length)
 {
   if (m_modemState != STATE_DSTAR && m_modemState != STATE_IDLE)
@@ -1250,62 +1251,36 @@ void CSerialPort::writeNXDNLost()
   writeInt(1U, reply, 3);
 }
 
-void CSerialPort::writeFMData(const uint8_t* data, uint8_t length)
+void CSerialPort::writeAX25Data(const uint8_t* data, uint16_t length)
 {
   if (m_modemState != STATE_FM && m_modemState != STATE_IDLE)
     return;
 
-  if (!m_fmEnable)
+  if (!m_ax25Enable)
     return;
 
-  uint8_t reply[255U];
+  uint8_t reply[512U];
 
   reply[0U] = MMDVM_FRAME_START;
-  reply[1U] = 0U;
-  reply[2U] = MMDVM_FM_DATA;
 
-  uint8_t count = 3U;
+  if (length > 252U) {
-  for (uint8_t i = 0U; i < length; i++, count++)
+    reply[1U] = 0U;
-    reply[count] = data[i];
+    reply[2U] = (length + 4U) - 255U;
+    reply[3U] = MMDVM_AX25_DATA;
 
-  reply[1U] = count;
+    for (uint8_t i = 0U; i < length; i++)
+      reply[i + 4U] = data[i];
 
-  writeInt(1U, reply, count);
+    writeInt(1U, reply, length + 4U);
-}
+  } else {
+    reply[1U] = length + 3U;
+    reply[2U] = MMDVM_AX25_DATA;
 
-void CSerialPort::writeFMStatus(uint8_t status)
+    for (uint8_t i = 0U; i < length; i++)
-{
+      reply[i + 3U] = data[i];
-  if (m_modemState != STATE_FM && m_modemState != STATE_IDLE)
-    return;
 
-  if (!m_fmEnable)
+    writeInt(1U, reply, length + 3U);
-    return;
+  }
-
-  uint8_t reply[10U];
-
-  reply[0U] = MMDVM_FRAME_START;
-  reply[1U] = 4U;
-  reply[2U] = MMDVM_FM_STATUS;
-  reply[3U] = status;
-
-  writeInt(1U, reply, 4U);
-}
-
-void CSerialPort::writeFMEOT()
-{
-  if (m_modemState != STATE_FM && m_modemState != STATE_IDLE)
-    return;
-
-  if (!m_fmEnable)
-    return;
-
-  uint8_t reply[10U];
-
-  reply[0U] = MMDVM_FRAME_START;
-  reply[1U] = 3U;
-  reply[2U] = MMDVM_FM_EOT;
-
-  writeInt(1U, reply, 3U);
 }
 
 void CSerialPort::writeCalData(const uint8_t* data, uint8_t length)

SerialPort.h

@@ -21,11 +21,7 @@
 
 #include "Config.h"
 #include "Globals.h"
-#include "RingBuffer.h"
+#include "SerialRB.h"
-
-#if !defined(SERIAL_SPEED)
-#define SERIAL_SPEED 115200
-#endif
 
 
 class CSerialPort {
@@ -54,9 +50,7 @@ public:
   void writeNXDNData(const uint8_t* data, uint8_t length);
   void writeNXDNLost();
 
-  void writeFMData(const uint8_t* data, uint8_t length);
+  void writeAX25Data(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);
@@ -68,23 +62,23 @@ 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;
-  CRingBuffer<uint8_t> m_repeat;
+  CSerialRB 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, uint8_t length);
+  uint8_t setFMParams1(const uint8_t* data, uint16_t length);
-  uint8_t setFMParams2(const uint8_t* data, uint8_t length);
+  uint8_t setFMParams2(const uint8_t* data, uint16_t length);
-  uint8_t setFMParams3(const uint8_t* data, uint8_t length);
+  uint8_t setFMParams3(const uint8_t* data, uint16_t length);
-  uint8_t setFMParams4(const uint8_t* data, uint8_t length);
+  void    processMessage(const uint8_t* data, uint16_t length);
 
   // Hardware versions
   void    beginInt(uint8_t n, int speed);

SerialRB.cpp

@@ -0,0 +1,100 @@
+/*
+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_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

@@ -0,0 +1,62 @@
+/*
+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

@@ -39,7 +39,9 @@ UART5  - TXD PC12 - RXD PD2 (Discovery, MMDVM-Pi, MMDVM-Pi F722 board, MMDVM-F4M
 
 #if defined(STM32F4XX) || defined(STM32F7XX)
 
-#include "STMUART.h"
+#define TX_SERIAL_FIFO_SIZE 512U
+#define RX_SERIAL_FIFO_SIZE 512U
+
 extern "C" {
    void USART1_IRQHandler();
    void USART2_IRQHandler();
@@ -48,14 +50,113 @@ extern "C" {
 }
 
 /* ************* USART1 ***************** */
-#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)
+#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;
 
-static CSTMUART m_USART1;
+// Init queues
+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()
 {
-  m_USART1.handleIRQ();
+   uint8_t c;
+
+   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)
@@ -100,7 +201,41 @@ void InitUSART1(int speed)
 
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
 
-   m_USART1.init(USART1);
+   // initialize the fifos
+   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
@@ -108,12 +243,111 @@ void InitUSART1(int speed)
 /* ************* USART2 ***************** */
 #if defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO) || defined(DRCC_DVM)
 
-static CSTMUART m_USART2;
+volatile uint8_t  TXSerialfifo2[TX_SERIAL_FIFO_SIZE];
+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()
 {
-   m_USART2.handleIRQ();
+   uint8_t c;
+
+   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)
@@ -158,7 +392,41 @@ void InitUSART2(int speed)
 
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
 
-   m_USART2.init(USART2);
+   // initialize the fifos
+   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
@@ -166,11 +434,111 @@ void InitUSART2(int speed)
 /* ************* USART3 ***************** */
 #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
 
-static CSTMUART m_USART3;
+volatile uint8_t  TXSerialfifo3[TX_SERIAL_FIFO_SIZE];
+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()
 {
-   m_USART3.handleIRQ();
+   uint8_t c;
+
+   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)
@@ -232,7 +600,41 @@ void InitUSART3(int speed)
 
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
 
-   m_USART3.init(USART3);
+   // initialize the fifos
+   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
@@ -240,11 +642,111 @@ void InitUSART3(int speed)
 /* ************* UART5 ***************** */
 #if !(defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER))
 
-static CSTMUART m_UART5;
+volatile uint8_t  TXSerialfifo5[TX_SERIAL_FIFO_SIZE];
+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()
 {
-   m_UART5.handleIRQ();
+   uint8_t c;
+
+   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)
@@ -293,7 +795,41 @@ void InitUART5(int speed)
 
    USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
 
-   m_UART5.init(UART5);
+   // initialize the fifos
+   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
@@ -305,7 +841,7 @@ 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) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM)
+         #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) || defined(STM32F4_RPT_HAT_TGO)
          InitUSART2(speed);
@@ -332,21 +868,21 @@ int CSerialPort::availableInt(uint8_t n)
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         return m_USART3.availble();//AvailUSART3();
+         return AvailUSART3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM)
+         #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 m_USART1.available();//AvailUSART1();
+         return AvailUSART1();
          #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         return m_USART2.available();//AvailUSART2();
+         return AvailUSART2();
          #elif defined(DRCC_DVM)
-         return m_USART1.available();//AvailUSART1();
+         return AvailUSART1();
          #endif
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         return m_USART1.available(); //AvailUSART1();
+         return AvailUSART1();
          #elif defined(DRCC_DVM)
-         return m_USART2.available(); //AvailUSART2();
+         return AvailUSART2();
          #else
-         return m_UART5.available();//AvailUART5();
+         return AvailUART5();
          #endif
       default:
          return 0;
@@ -358,21 +894,21 @@ int CSerialPort::availableForWriteInt(uint8_t n)
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         return m_USART3.availableForWrite(); //AvailForWriteUSART3();
+         return AvailForWriteUSART3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM)
+         #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 m_USART1.availableForWrite(); //AvailForWriteUSART1();
+         return AvailForWriteUSART1();
          #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         return m_USART2.availableForWrite();//AvailForWriteUSART2();
+         return AvailForWriteUSART2();
          #elif defined(DRCC_DVM)
-         return m_USART1.availableForWrite();//AvailForWriteUSART1();
+         return AvailForWriteUSART1();
          #endif
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         return m_USART1.availableForWrite(); //AvailForWriteUSART1();
+         return AvailForWriteUSART1();
          #elif defined(DRCC_DVM)
-         return m_USART2.availableForWrite();//AvailForWriteUSART2();
+         return AvailForWriteUSART2();
          #else
-         return m_UART5.availableForWrite();//AvailForWriteUART5();
+         return AvailForWriteUART5();
          #endif
       default:
          return 0;
@@ -384,21 +920,21 @@ uint8_t CSerialPort::readInt(uint8_t n)
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
-         return m_USART3.read();//ReadUSART3();
+         return ReadUSART3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM)
+         #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 m_USART1.read();//ReadUSART1();
+         return ReadUSART1();
          #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         return m_USART2.read();//ReadUSART2();
+         return ReadUSART2();
          #elif defined(DRCC_DVM)
-         return m_USART1.read();//ReadUSART1();
+         return ReadUSART1();
          #endif
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         return m_USART1.read();//ReadUSART1();
+         return ReadUSART1();
          #elif defined(DRCC_DVM)
-         return m_USART2.read();//ReadUSART2();
+         return ReadUSART2();
          #else
-         return m_UART5.read();//ReadUART5();
+         return ReadUART5();
          #endif
       default:
          return 0U;
@@ -410,36 +946,36 @@ 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)
-         m_USART3.write(data, length); //WriteUSART3(data, length);
+         WriteUSART3(data, length);
          if (flush)
-            m_USART3.flush();//TXSerialFlush3();
+            TXSerialFlush3();
-         #elif defined(STM32F4_PI) || defined(STM32F4_F4M) || defined(STM32F722_PI) || defined(STM32F722_F7M) || defined(STM32F722_RPT_HAT) || defined(STM32F4_DVM)
+         #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)
-         m_USART1.write(data, length);//WriteUSART1(data, length);
+         WriteUSART1(data, length);
          if (flush)
-            m_USART1.flush();//TXSerialFlush1();
+            TXSerialFlush1();
          #elif defined(STM32F4_NUCLEO) || defined(STM32F4_RPT_HAT_TGO)
-         m_USART2.write(data, length);//WriteUSART2(data, length);
+         WriteUSART2(data, length);
          if (flush)
-            m_USART2.flush();//TXSerialFlush2();
+            TXSerialFlush2();
          #elif defined(DRCC_DVM)
-         m_USART1.write(data, length);//WriteUSART1(data, length);
+         WriteUSART1(data, length);
          if (flush)
-            m_USART1.flush();//TXSerialFlush1();
+            TXSerialFlush1();
          #endif
          break;
       case 3U:
          #if defined(STM32F4_NUCLEO) && defined(STM32F4_NUCLEO_ARDUINO_HEADER)
-         m_USART1.write(data, length); //WriteUSART1(data, length);
+         WriteUSART1(data, length);
          if (flush)
-            m_USART1.flush();
+            TXSerialFlush1();
          #elif defined(DRCC_DVM)
-         m_USART2.write(data, length);//WriteUSART2(data, length);
+         WriteUSART2(data, length);
          if (flush)
-            m_USART2.flush();//TXSerialFlush2();
+            TXSerialFlush2();
          #else
-         m_UART5.write(data, length);//WriteUART5(data, length);
+         WriteUART5(data, length);
          if (flush)
-            m_UART5.flush();//TXSerialFlush5();
+            TXSerialFlush5();
          #endif
          break;
       default:

Tools/FMGenerateFilterCoefficients.py

@@ -17,30 +17,30 @@ f2 = 2700
 rp = 0.2
 
 # scaling factor in bits, do not change !
-q = 15
+q = 0
 # 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, '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)
+#sos = np.round((sos) * scaling_factor)
 
 # print coefficients
-for biquad in sosrounded:
+for biquad in sos:
     for coeff in biquad:
-        print(int(coeff),",",sep="",end="")
+        #print(int(coeff),",",sep="",end="")
-        #print((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)
+w,h = signal.freqz(b,a)
 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.ylim(top=1,bottom=-20);
 pl.xlim(left=250, right=12000);
 pl.show()

YSFRX.cpp

@@ -36,7 +36,7 @@ const uint8_t NOAVEPTR = 99U;
 
 const uint16_t NOENDPTR = 9999U;
 
-const unsigned int MAX_SYNC_FRAMES = 4U + 1U;
+const unsigned int MAX_SYNC_FRAMES = 1U + 1U;
 
 CYSFRX::CYSFRX() :
 m_state(YSFRXS_NONE),

YSFTX.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
@@ -73,8 +73,7 @@ void CYSFTX::process()
         m_poBuffer[m_poLen++] = YSF_START_SYNC;
     } else {
       for (uint8_t i = 0U; i < YSF_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c = 0U;
+        uint8_t c = m_buffer.get();
-        m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
     }
@@ -117,7 +116,7 @@ void CYSFTX::process()
   }
 }
 
-uint8_t CYSFTX::writeData(const uint8_t* data, uint8_t length)
+uint8_t CYSFTX::writeData(const uint8_t* data, uint16_t length)
 {
   if (length != (YSF_FRAME_LENGTH_BYTES + 1U))
     return 4U;

YSFTX.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
@@ -21,13 +21,13 @@
 
 #include "Config.h"
 
-#include "RingBuffer.h"
+#include "SerialRB.h"
 
 class CYSFTX {
 public:
   CYSFTX();
 
-  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:
   void setParams(bool on, uint8_t txHang);
 
 private:
-  CRingBuffer<uint8_t>                        m_buffer;
+  CSerialRB                        m_buffer;
   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];

pins/pins_f4_drcc_nqf.h

@@ -22,36 +22,40 @@
 /*
 Pin definitions for DRCC_DVM BG7NQF  board rev1
 
-PTT      PB12   output
+TX/PTT_LED  PB12   output
-LED_PTT  PB4    output
+RX/COS_LED  PB5    output
-LED_COS  PB5    output
+STATUS_LED  PB10   output
-LED_SRV  PB10   output
-COS      PB13   input
 
-DSTAR    N/A
+COS_IN      PB13   input
-DMR      N/A
-YSF      N/A
-P25      N/A
-NXDN     N/A
-POCSAG   N/A
 
-MDSTAR   PB14   output
+DSTAR       N/A
-MDMR     PB8    output
+DMR         N/A
-MYSF     PB9    output
+YSF         N/A
-MP25     PB15   output
+P25         N/A
-MNXDN    N/A
+NXDN        N/A
-MPOCSAG  N/A
+POCSAG      N/A
 
-RX       PB0    analog input
+MDMR/BIT0   PB8    output
-RSSI     PB1    analog input
+MYSF/BIT1   PB9    output
-TX       PA4    analog output
+MDSTAR/BIT2 PB14   output
+MP25/BIT3   PB15   output          Generic Mode Pins
+MNXDN       N/A
+MPOCSAG     N/A
 
-EXT_CLK  PA15   input
+RX          PA0    analog input
+RSSI        PA1    analog input
+TX          PA4    analog output
 
-UART1_TX PA9    output
+EXT_CLK     PA15   input
-UART1_RX PA10   output
+
-UART2_TX PA2    output
+UART1_TX    PA9    output
-UART2_RX PA3    output
+UART1_RX    PA10   output          Host Data Communication
+
+UART2_TX    PA2    output
+UART2_RX    PA3    output          Nextion Data Communication
+
+I2C1_SCL    PB6    output
+I2C1_SDA    PB7    output          OLED Data Communication as master
 
 */
 
@@ -124,13 +128,13 @@ UART2_RX PA3    output
 
 #define PIN_RX            GPIO_Pin_0
 #define PIN_RX_CH         ADC_Channel_0
-#define PORT_RX           GPIOB
+#define PORT_RX           GPIOA
-#define RCC_Per_RX        RCC_AHB1Periph_GPIOB
+#define RCC_Per_RX        RCC_AHB1Periph_GPIOA
 
 #define PIN_RSSI          GPIO_Pin_1
 #define PIN_RSSI_CH       ADC_Channel_1
-#define PORT_RSSI         GPIOB
+#define PORT_RSSI         GPIOA
-#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOB
+#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOA
 
 #define PIN_TX            GPIO_Pin_4
 #define PIN_TX_CH         DAC_Channel_1

pins/pins_f4_stm32eda.h

@@ -0,0 +1,108 @@
+/*
+ *   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 _PINS_F4_STM32EDA
+#define _PINS_F4_STM32EDA
+
+/*
+Pin definitions for STM32F4 STM32-DVM-MTR2K & STM32-DVM-MASTR3:
+
+COS      PB13   input
+PTT      PB12   output
+COSLED   PB4    output
+LED      PB3    output
+
+P25      PB8    output
+NXDN     PB9    output
+DSTAR    PB6    output
+DMR      PB5    output
+YSF      PB7    output
+POCSAG   PC10   output
+FM       PC11   output
+
+RX       PB0    analog input
+RSSI     PB1    analog input
+TX       PA4    analog output
+
+EXT_CLK  PA15   input
+*/
+
+#define PIN_COS           GPIO_Pin_13
+#define PORT_COS          GPIOB
+#define RCC_Per_COS       RCC_AHB1Periph_GPIOB
+
+
+#define PIN_PTT           GPIO_Pin_12
+#define PORT_PTT          GPIOB
+#define RCC_Per_PTT       RCC_AHB1Periph_GPIOB
+
+#define PIN_COSLED        GPIO_Pin_4
+#define PORT_COSLED       GPIOB
+#define RCC_Per_COSLED    RCC_AHB1Periph_GPIOB
+
+#define PIN_LED           GPIO_Pin_3
+#define PORT_LED          GPIOB
+#define RCC_Per_LED       RCC_AHB1Periph_GPIOB
+
+#define PIN_P25           GPIO_Pin_8
+#define PORT_P25          GPIOB
+#define RCC_Per_P25       RCC_AHB1Periph_GPIOB
+
+#define PIN_NXDN          GPIO_Pin_9
+#define PORT_NXDN         GPIOB
+#define RCC_Per_NXDN      RCC_AHB1Periph_GPIOB
+
+#define PIN_DSTAR         GPIO_Pin_6
+#define PORT_DSTAR        GPIOB
+#define RCC_Per_DSTAR     RCC_AHB1Periph_GPIOB
+
+#define PIN_DMR           GPIO_Pin_5
+#define PORT_DMR          GPIOB
+#define RCC_Per_DMR       RCC_AHB1Periph_GPIOB
+
+#define PIN_YSF           GPIO_Pin_7
+#define PORT_YSF          GPIOB
+#define RCC_Per_YSF       RCC_AHB1Periph_GPIOB
+
+#define PIN_POCSAG        GPIO_Pin_10
+#define PORT_POCSAG       GPIOC
+#define RCC_Per_POCSAG    RCC_AHB1Periph_GPIOC
+
+#define PIN_FM            GPIO_Pin_11
+#define PORT_FM           GPIOC
+#define RCC_Per_FM        RCC_AHB1Periph_GPIOC
+
+#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_8
+#define PORT_RX           GPIOB
+#define RCC_Per_RX        RCC_AHB1Periph_GPIOB
+
+#define PIN_RSSI          GPIO_Pin_1
+#define PIN_RSSI_CH       ADC_Channel_9
+#define PORT_RSSI         GPIOB
+#define RCC_Per_RSSI      RCC_AHB1Periph_GPIOB
+
+#define PIN_TX            GPIO_Pin_4
+#define PIN_TX_CH         DAC_Channel_1
+
+#endif
+