mirror of https://github.com/g4klx/MMDVM.git
Use the D-Star correlator receiver.
This commit is contained in:
Jonathan Naylor
parent
46c0958704
commit
31744a237a
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2009-2016 by Jonathan Naylor G4KLX
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* Copyright (C) 2009-2016,2020 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -27,7 +27,7 @@
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const unsigned int BUFFER_LENGTH = 200U;
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const uint32_t PLLMAX = 0x10000U;
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const uint32_t PLLINC = PLLMAX / DSTAR_RADIO_BIT_LENGTH;
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const uint32_t PLLINC = PLLMAX / DSTAR_RADIO_SYMBOL_LENGTH;
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const uint32_t INC = PLLINC / 32U;
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// D-Star bit order version of 0x55 0x2D 0x16
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
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* Copyright (C) 2015,2016,2020 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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18
Config.h
18
Config.h
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@ -22,34 +22,32 @@
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// Allow for the selection of which modes to compile into the firmware. This is particularly useful for processors
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// which have limited code space and processing power like the STM32F103, which is found on older/cheaper boards.
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// Enable D-Star support, the D-Star correlator improves the sensitivity of D-Star enormously but uses quite a lot
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// of processing power.
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// Enable D-Star support.
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#define MODE_DSTAR
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#define USE_DSTAR_CORRELATOR
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// Enable DMR support
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// Enable DMR support.
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#define MODE_DMR
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// Enable System Fusion support
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// Enable System Fusion support.
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#define MODE_YSF
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// Enable P25 phase 1 support.
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#define MODE_P25
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// Enable NXDN support, the boxcar filter sometimes improves the performance of P25 receive on some systems
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// Enable NXDN support, the boxcar filter sometimes improves the performance of NXDN receive on some systems.
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#define MODE_NXDN
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#define USE_NXDN_BOXCAR
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// Enable M17 support
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// Enable M17 support.
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#define MODE_M17
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// Enable POCSAG support
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// Enable POCSAG support.
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#define MODE_POCSAG
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// Enable FM support
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// Enable FM support.
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#define MODE_FM
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// Enable AX.25 support, this is only enabled if MODE_FM is also defined.
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// Enable AX.25 support, this is only enabled if FM is also enabled.
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#define MODE_AX25
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// Allow for the use of high quality external clock oscillators
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2009-2015 by Jonathan Naylor G4KLX
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* Copyright (C) 2009-2015,2017,2020 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -19,30 +19,50 @@
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#if !defined(DSTARDEFINES_H)
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#define DSTARDEFINES_H
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const unsigned int DSTAR_RADIO_BIT_LENGTH = 5U; // At 24 kHz sample rate
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const unsigned int DSTAR_RADIO_SYMBOL_LENGTH = 5U; // At 24 kHz sample rate
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const unsigned int DSTAR_HEADER_LENGTH_BYTES = 41U;
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const unsigned int DSTAR_HEADER_LENGTH_BITS = DSTAR_HEADER_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_HEADER_LENGTH_BYTES = 41U;
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const unsigned int DSTAR_FEC_SECTION_LENGTH_BYTES = 83U;
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const unsigned int DSTAR_FEC_SECTION_LENGTH_BITS = 660U;
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const unsigned int DSTAR_FEC_SECTION_LENGTH_BYTES = 83U;
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const unsigned int DSTAR_FEC_SECTION_LENGTH_SYMBOLS = 660U;
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const unsigned int DSTAR_FEC_SECTION_LENGTH_SAMPLES = DSTAR_FEC_SECTION_LENGTH_SYMBOLS * DSTAR_RADIO_SYMBOL_LENGTH;
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const unsigned int DSTAR_DATA_LENGTH_BYTES = 12U;
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const unsigned int DSTAR_DATA_LENGTH_BITS = DSTAR_DATA_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_DATA_LENGTH_BYTES = 12U;
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const unsigned int DSTAR_DATA_LENGTH_SYMBOLS = DSTAR_DATA_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_DATA_LENGTH_SAMPLES = DSTAR_DATA_LENGTH_SYMBOLS * DSTAR_RADIO_SYMBOL_LENGTH;
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const uint8_t DSTAR_EOT_BYTES[] = {0x55, 0x55, 0x55, 0x55, 0xC8, 0x7A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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const unsigned int DSTAR_EOT_LENGTH_BYTES = 6U;
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const unsigned int DSTAR_EOT_LENGTH_BITS = DSTAR_EOT_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_END_SYNC_LENGTH_BYTES = 6U;
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const unsigned int DSTAR_END_SYNC_LENGTH_BITS = DSTAR_END_SYNC_LENGTH_BYTES * 8U;
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const uint8_t DSTAR_DATA_SYNC_LENGTH_BYTES = 3U;
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const uint8_t DSTAR_DATA_SYNC_LENGTH_BITS = DSTAR_DATA_SYNC_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_FRAME_SYNC_LENGTH_BYTES = 3U;
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const unsigned int DSTAR_FRAME_SYNC_LENGTH_SYMBOLS = DSTAR_FRAME_SYNC_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_FRAME_SYNC_LENGTH_SAMPLES = DSTAR_FRAME_SYNC_LENGTH_SYMBOLS * DSTAR_RADIO_SYMBOL_LENGTH;
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const uint8_t DSTAR_DATA_SYNC_BYTES[] = {0x9E, 0x8D, 0x32, 0x88, 0x26, 0x1A, 0x3F, 0x61, 0xE8, 0x55, 0x2D, 0x16};
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const unsigned int DSTAR_DATA_SYNC_LENGTH_BYTES = 3U;
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const unsigned int DSTAR_DATA_SYNC_LENGTH_SYMBOLS = DSTAR_DATA_SYNC_LENGTH_BYTES * 8U;
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const unsigned int DSTAR_DATA_SYNC_LENGTH_SAMPLES = DSTAR_DATA_SYNC_LENGTH_SYMBOLS * DSTAR_RADIO_SYMBOL_LENGTH;
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const uint8_t DSTAR_SLOW_DATA_TYPE_TEXT = 0x40U;
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const uint8_t DSTAR_SLOW_DATA_TYPE_HEADER = 0x50U;
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const uint8_t DSTAR_DATA_SYNC_BYTES[] = {0x9E, 0x8D, 0x32, 0x88, 0x26, 0x1A, 0x3F, 0x61, 0xE8, 0x55, 0x2D, 0x16};
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const uint8_t DSTAR_SCRAMBLER_BYTES[] = {0x70U, 0x4FU, 0x93U};
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// D-Star bit order version of 0x55 0x6E 0x0A
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const uint32_t DSTAR_FRAME_SYNC_DATA = 0x00557650U;
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const uint32_t DSTAR_FRAME_SYNC_MASK = 0x00FFFFFFU;
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const bool DSTAR_FRAME_SYNC_SYMBOLS[] = {false, true, false, true, false, true, false, true, false, true, true, true, false, true, true, false, false, true, false, true, false, false, false, false};
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// D-Star bit order version of 0x55 0x2D 0x16
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const uint32_t DSTAR_DATA_SYNC_DATA = 0x00AAB468U;
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const uint32_t DSTAR_DATA_SYNC_MASK = 0x00FFFFFFU;
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const bool DSTAR_DATA_SYNC_SYMBOLS[] = {true, false, true, false, true, false, true, false, true, false, true, true, false, true, false, false, false, true, true, false, true, false, false, false};
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// D-Star bit order version of 0x55 0x55 0xC8 0x7A
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const uint32_t DSTAR_END_SYNC_DATA = 0xAAAA135EU;
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const uint32_t DSTAR_END_SYNC_MASK = 0xFFFFFFFFU;
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const uint8_t DSTAR_END_SYNC_BYTES[] = {0x55, 0x55, 0x55, 0x55, 0xC8, 0x7A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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const uint8_t DSTAR_SLOW_DATA_TYPE_TEXT = 0x40U;
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const uint8_t DSTAR_SLOW_DATA_TYPE_HEADER = 0x50U;
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const uint8_t DSTAR_SCRAMBLER_BYTES[] = {0x70U, 0x4FU, 0x93U};
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#endif
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375
DStarRX.cpp
375
DStarRX.cpp
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
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* Copyright (C) 2009-2017,2020 by Jonathan Naylor G4KLX
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* Copyright (C) 2017 by Andy Uribe CA6JAU
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*
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* This program is free software; you can redistribute it and/or modify
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@ -25,18 +25,12 @@
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#include "DStarRX.h"
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#include "Utils.h"
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const unsigned int BUFFER_LENGTH = 200U;
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const uint32_t PLLMAX = 0x10000U;
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const uint32_t PLLINC = PLLMAX / DSTAR_RADIO_BIT_LENGTH;
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const uint32_t INC = PLLINC / 32U;
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const unsigned int MAX_SYNC_BITS = 100U * DSTAR_DATA_LENGTH_BITS;
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const unsigned int MAX_FRAMES = 150U;
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// D-Star bit order version of 0x55 0x55 0x6E 0x0A
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const uint32_t FRAME_SYNC_DATA = 0x00557650U;
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const uint32_t FRAME_SYNC_MASK = 0x00FFFFFFU;
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const uint8_t FRAME_SYNC_ERRS = 2U;
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const uint8_t FRAME_SYNC_ERRS = 1U;
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// D-Star bit order version of 0x55 0x2D 0x16
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const uint32_t DATA_SYNC_DATA = 0x00AAB468U;
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0xf78fU, 0xe606U, 0xd49dU, 0xc514U, 0xb1abU, 0xa022U, 0x92b9U, 0x8330U,
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0x7bc7U, 0x6a4eU, 0x58d5U, 0x495cU, 0x3de3U, 0x2c6aU, 0x1ef1U, 0x0f78U};
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const uint16_t NOENDPTR = 9999U;
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CDStarRX::CDStarRX() :
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m_pll(0U),
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m_prev(false),
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m_rxState(DSRXS_NONE),
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m_patternBuffer(0x00U),
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m_rxBuffer(),
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m_rxBufferBits(0U),
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m_dataBits(0U),
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m_bitBuffer(),
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m_headerBuffer(),
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m_dataBuffer(),
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m_bitPtr(0U),
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m_headerPtr(0U),
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m_dataPtr(0U),
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m_startPtr(NOENDPTR),
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m_syncPtr(NOENDPTR),
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m_minSyncPtr(NOENDPTR),
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m_maxSyncPtr(NOENDPTR),
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m_maxFrameCorr(0),
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m_maxDataCorr(0),
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m_frameCount(0U),
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m_countdown(0U),
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m_mar(0U),
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m_pathMetric(),
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m_pathMemory0(),
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@ -262,14 +266,20 @@ m_rssiCount(0U)
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void CDStarRX::reset()
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{
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m_pll = 0U;
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m_prev = false;
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m_rxState = DSRXS_NONE;
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m_patternBuffer = 0x00U;
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m_rxBufferBits = 0U;
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m_dataBits = 0U;
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m_rssiAccum = 0U;
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m_rssiCount = 0U;
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m_rxState = DSRXS_NONE;
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m_headerPtr = 0U;
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m_dataPtr = 0U;
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m_bitPtr = 0U;
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m_maxFrameCorr = 0;
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m_maxDataCorr = 0;
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m_startPtr = NOENDPTR;
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m_syncPtr = NOENDPTR;
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m_minSyncPtr = NOENDPTR;
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m_maxSyncPtr = NOENDPTR;
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m_frameCount = 0U;
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m_countdown = 0U;
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m_rssiAccum = 0U;
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m_rssiCount = 0U;
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}
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void CDStarRX::samples(const q15_t* samples, const uint16_t* rssi, uint8_t length)
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@ -278,125 +288,117 @@ void CDStarRX::samples(const q15_t* samples, const uint16_t* rssi, uint8_t lengt
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m_rssiAccum += rssi[i];
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m_rssiCount++;
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bool bit = samples[i] < 0;
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q15_t sample = samples[i];
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if (bit != m_prev) {
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if (m_pll < (PLLMAX / 2U))
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m_pll += INC;
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else
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m_pll -= INC;
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m_bitBuffer[m_bitPtr] <<= 1;
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if (sample < 0)
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m_bitBuffer[m_bitPtr] |= 0x01U;
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m_dataBuffer[m_dataPtr] = sample;
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switch (m_rxState) {
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case DSRXS_HEADER:
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processHeader(sample);
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break;
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case DSRXS_DATA:
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processData();
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break;
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default:
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processNone(sample);
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break;
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}
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m_prev = bit;
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m_dataPtr++;
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if (m_dataPtr >= DSTAR_DATA_LENGTH_SAMPLES)
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m_dataPtr = 0U;
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m_pll += PLLINC;
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if (m_pll >= PLLMAX) {
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m_pll -= PLLMAX;
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switch (m_rxState) {
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case DSRXS_NONE:
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processNone(bit);
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break;
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case DSRXS_HEADER:
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processHeader(bit);
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break;
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case DSRXS_DATA:
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processData(bit);
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break;
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default:
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break;
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}
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}
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m_bitPtr++;
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if (m_bitPtr >= DSTAR_RADIO_SYMBOL_LENGTH)
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m_bitPtr = 0U;
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}
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}
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void CDStarRX::processNone(bool bit)
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void CDStarRX::processNone(q15_t sample)
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{
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m_patternBuffer <<= 1;
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if (bit)
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m_patternBuffer |= 0x01U;
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// Fuzzy matching of the frame sync sequence
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if (countBits32((m_patternBuffer & FRAME_SYNC_MASK) ^ FRAME_SYNC_DATA) <= FRAME_SYNC_ERRS) {
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DEBUG1("DStarRX: found frame sync in None");
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bool ret = correlateFrameSync();
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if (ret) {
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m_countdown = 5U;
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::memset(m_rxBuffer, 0x00U, DSTAR_FEC_SECTION_LENGTH_BYTES);
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m_rxBufferBits = 0U;
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m_headerBuffer[m_headerPtr] = sample;
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m_headerPtr++;
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m_rssiAccum = 0U;
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m_rssiCount = 0U;
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m_rxState = DSRXS_HEADER;
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return;
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}
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// Exact matching of the data sync bit sequence
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if (countBits32((m_patternBuffer & DATA_SYNC_MASK) ^ DATA_SYNC_DATA) == 0U) {
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// Fuzzy matching of the data sync bit sequence
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ret = correlateDataSync();
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if (ret) {
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DEBUG1("DStarRX: found data sync in None");
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io.setDecode(true);
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io.setADCDetection(true);
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// Suppress RSSI on the dummy sync message
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m_rssiAccum = 0U;
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m_rssiCount = 0U;
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::memcpy(m_rxBuffer, DSTAR_DATA_SYNC_BYTES, DSTAR_DATA_LENGTH_BYTES);
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writeRSSIData(m_rxBuffer);
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::memset(m_rxBuffer, 0x00U, DSTAR_DATA_LENGTH_BYTES + 2U);
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m_rxBufferBits = 0U;
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m_dataBits = MAX_SYNC_BITS;
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m_rxState = DSRXS_DATA;
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return;
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m_rxState = DSRXS_DATA;
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}
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}
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void CDStarRX::processHeader(bool bit)
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void CDStarRX::processHeader(q15_t sample)
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{
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m_patternBuffer <<= 1;
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if (bit)
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m_patternBuffer |= 0x01U;
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if (m_countdown > 0U) {
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correlateFrameSync();
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m_countdown--;
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}
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WRITE_BIT2(m_rxBuffer, m_rxBufferBits, bit);
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m_rxBufferBits++;
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m_headerBuffer[m_headerPtr] = sample;
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m_headerPtr++;
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// A full FEC header
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if (m_rxBufferBits == DSTAR_FEC_SECTION_LENGTH_BITS) {
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// Process the scrambling, interleaving and FEC, then return if the chcksum was correct
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unsigned char header[DSTAR_HEADER_LENGTH_BYTES];
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bool ok = rxHeader(m_rxBuffer, header);
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if (ok) {
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if (m_headerPtr == (DSTAR_FEC_SECTION_LENGTH_SAMPLES + DSTAR_RADIO_SYMBOL_LENGTH)) {
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uint8_t buffer[DSTAR_FEC_SECTION_LENGTH_BYTES];
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samplesToBits(m_headerBuffer, DSTAR_RADIO_SYMBOL_LENGTH, DSTAR_FEC_SECTION_LENGTH_SYMBOLS, buffer, DSTAR_FEC_SECTION_LENGTH_SAMPLES);
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// Process the scrambling, interleaving and FEC, then return true if the chcksum was correct
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uint8_t header[DSTAR_HEADER_LENGTH_BYTES];
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bool ok = rxHeader(buffer, header);
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if (!ok) {
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// The checksum failed, return to looking for syncs
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m_rxState = DSRXS_NONE;
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m_maxFrameCorr = 0;
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m_maxDataCorr = 0;
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} else {
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io.setDecode(true);
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io.setADCDetection(true);
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writeRSSIHeader(header);
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::memset(m_rxBuffer, 0x00U, DSTAR_DATA_LENGTH_BYTES + 2U);
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m_rxBufferBits = 0U;
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m_rxState = DSRXS_DATA;
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m_dataBits = MAX_SYNC_BITS;
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} else {
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// The checksum failed, return to looking for syncs
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m_rxState = DSRXS_NONE;
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}
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}
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// Ready to start the first data section
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if (m_headerPtr == (DSTAR_FEC_SECTION_LENGTH_SAMPLES + 2U * DSTAR_RADIO_SYMBOL_LENGTH)) {
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m_frameCount = 0U;
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m_dataPtr = 0U;
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m_startPtr = 476U;
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m_syncPtr = 471U;
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m_maxSyncPtr = 472U;
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m_minSyncPtr = 470U;
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|
||||
DEBUG5("DStarRX: calc start/sync/max/min", m_startPtr, m_syncPtr, m_maxSyncPtr, m_minSyncPtr);
|
||||
|
||||
m_rxState = DSRXS_DATA;
|
||||
}
|
||||
}
|
||||
|
||||
void CDStarRX::processData(bool bit)
|
||||
void CDStarRX::processData()
|
||||
{
|
||||
m_patternBuffer <<= 1;
|
||||
if (bit)
|
||||
m_patternBuffer |= 0x01U;
|
||||
|
||||
WRITE_BIT2(m_rxBuffer, m_rxBufferBits, bit);
|
||||
m_rxBufferBits++;
|
||||
|
||||
// Fuzzy matching of the end frame sequences
|
||||
if (countBits32((m_patternBuffer & END_SYNC_MASK) ^ END_SYNC_DATA) <= END_SYNC_ERRS) {
|
||||
if (countBits32((m_bitBuffer[m_bitPtr] & DSTAR_END_SYNC_MASK) ^ DSTAR_END_SYNC_DATA) <= END_SYNC_ERRS) {
|
||||
DEBUG1("DStarRX: Found end sync in Data");
|
||||
|
||||
io.setDecode(false);
|
||||
|
|
@ -404,35 +406,24 @@ void CDStarRX::processData(bool bit)
|
|||
|
||||
serial.writeDStarEOT();
|
||||
|
||||
m_maxFrameCorr = 0;
|
||||
m_maxDataCorr = 0;
|
||||
|
||||
m_rxState = DSRXS_NONE;
|
||||
return;
|
||||
}
|
||||
|
||||
// Fuzzy matching of the data sync bit sequence
|
||||
bool syncSeen = false;
|
||||
if (m_rxBufferBits >= (DSTAR_DATA_LENGTH_BITS - 3U)) {
|
||||
if (countBits32((m_patternBuffer & DATA_SYNC_MASK) ^ DATA_SYNC_DATA) <= DATA_SYNC_ERRS) {
|
||||
m_rxBufferBits = DSTAR_DATA_LENGTH_BITS;
|
||||
m_dataBits = MAX_SYNC_BITS;
|
||||
syncSeen = true;
|
||||
}
|
||||
if (m_minSyncPtr < m_maxSyncPtr) {
|
||||
if (m_dataPtr >= m_minSyncPtr && m_dataPtr <= m_maxSyncPtr)
|
||||
correlateDataSync();
|
||||
} else {
|
||||
if (m_dataPtr >= m_minSyncPtr || m_dataPtr <= m_maxSyncPtr)
|
||||
correlateDataSync();
|
||||
}
|
||||
|
||||
// Check to see if the sync is arriving late
|
||||
if (m_rxBufferBits == DSTAR_DATA_LENGTH_BITS && !syncSeen) {
|
||||
for (uint8_t i = 1U; i <= 3U; i++) {
|
||||
uint32_t syncMask = DATA_SYNC_MASK >> i;
|
||||
uint32_t syncData = DATA_SYNC_DATA >> i;
|
||||
if (countBits32((m_patternBuffer & syncMask) ^ syncData) <= DATA_SYNC_ERRS) {
|
||||
m_rxBufferBits -= i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
m_dataBits--;
|
||||
|
||||
if (m_dataBits == 0U) {
|
||||
// We've not seen a data sync for too long, signal RXLOST and change to RX_NONE
|
||||
if (m_frameCount >= MAX_FRAMES) {
|
||||
DEBUG1("DStarRX: data sync timed out, lost lock");
|
||||
|
||||
io.setDecode(false);
|
||||
|
|
@ -440,24 +431,35 @@ void CDStarRX::processData(bool bit)
|
|||
|
||||
serial.writeDStarLost();
|
||||
|
||||
m_maxFrameCorr = 0;
|
||||
m_maxDataCorr = 0;
|
||||
|
||||
m_rxState = DSRXS_NONE;
|
||||
return;
|
||||
}
|
||||
|
||||
// Send a data frame to the host if the required number of bits have been received, or if a data sync has been seen
|
||||
if (m_rxBufferBits == DSTAR_DATA_LENGTH_BITS) {
|
||||
if (syncSeen) {
|
||||
m_rxBuffer[9U] = DSTAR_DATA_SYNC_BYTES[9U];
|
||||
m_rxBuffer[10U] = DSTAR_DATA_SYNC_BYTES[10U];
|
||||
m_rxBuffer[11U] = DSTAR_DATA_SYNC_BYTES[11U];
|
||||
writeRSSIData(m_rxBuffer);
|
||||
} else {
|
||||
serial.writeDStarData(m_rxBuffer, DSTAR_DATA_LENGTH_BYTES);
|
||||
}
|
||||
// Send a data frame to the host if the required number of bits have been received
|
||||
if (m_dataPtr == m_maxSyncPtr) {
|
||||
uint8_t buffer[DSTAR_DATA_LENGTH_BYTES + 2U];
|
||||
samplesToBits(m_dataBuffer, m_startPtr, DSTAR_DATA_LENGTH_SYMBOLS, buffer, DSTAR_DATA_LENGTH_SAMPLES);
|
||||
|
||||
// Start the next frame
|
||||
::memset(m_rxBuffer, 0x00U, DSTAR_DATA_LENGTH_BYTES + 2U);
|
||||
m_rxBufferBits = 0U;
|
||||
if ((m_frameCount % 21U) == 0U) {
|
||||
if (m_frameCount == 0U) {
|
||||
buffer[9U] = DSTAR_DATA_SYNC_BYTES[9U];
|
||||
buffer[10U] = DSTAR_DATA_SYNC_BYTES[10U];
|
||||
buffer[11U] = DSTAR_DATA_SYNC_BYTES[11U];
|
||||
DEBUG5("DStarRX: found start/sync/max/min", m_startPtr, m_syncPtr, m_maxSyncPtr, m_minSyncPtr);
|
||||
}
|
||||
|
||||
writeRSSIData(buffer);
|
||||
} else {
|
||||
serial.writeDStarData(buffer, DSTAR_DATA_LENGTH_BYTES);
|
||||
}
|
||||
|
||||
m_frameCount++;
|
||||
|
||||
m_maxFrameCorr = 0;
|
||||
m_maxDataCorr = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -503,6 +505,105 @@ void CDStarRX::writeRSSIData(unsigned char* data)
|
|||
m_rssiCount = 0U;
|
||||
}
|
||||
|
||||
bool CDStarRX::correlateFrameSync()
|
||||
{
|
||||
if (countBits32((m_bitBuffer[m_bitPtr] & DSTAR_FRAME_SYNC_MASK) ^ DSTAR_FRAME_SYNC_DATA) <= FRAME_SYNC_ERRS) {
|
||||
uint16_t ptr = m_dataPtr + DSTAR_DATA_LENGTH_SAMPLES - DSTAR_FRAME_SYNC_LENGTH_SAMPLES + DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
if (ptr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
ptr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
|
||||
q31_t corr = 0;
|
||||
|
||||
for (uint8_t i = 0U; i < DSTAR_FRAME_SYNC_LENGTH_SYMBOLS; i++) {
|
||||
q15_t val = m_dataBuffer[ptr];
|
||||
|
||||
if (DSTAR_FRAME_SYNC_SYMBOLS[i])
|
||||
corr -= val;
|
||||
else
|
||||
corr += val;
|
||||
|
||||
ptr += DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
if (ptr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
ptr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
}
|
||||
|
||||
if (corr > m_maxFrameCorr) {
|
||||
m_maxFrameCorr = corr;
|
||||
m_headerPtr = 0U;
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
bool CDStarRX::correlateDataSync()
|
||||
{
|
||||
uint8_t maxErrs = 0U;
|
||||
if (m_rxState == DSRXS_DATA)
|
||||
maxErrs = DATA_SYNC_ERRS;
|
||||
|
||||
if (countBits32((m_bitBuffer[m_bitPtr] & DSTAR_DATA_SYNC_MASK) ^ DSTAR_DATA_SYNC_DATA) <= maxErrs) {
|
||||
uint16_t ptr = m_dataPtr + DSTAR_DATA_LENGTH_SAMPLES - DSTAR_DATA_SYNC_LENGTH_SAMPLES + DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
if (ptr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
ptr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
|
||||
q31_t corr = 0;
|
||||
|
||||
for (uint8_t i = 0U; i < DSTAR_DATA_SYNC_LENGTH_SYMBOLS; i++) {
|
||||
q15_t val = m_dataBuffer[ptr];
|
||||
|
||||
if (DSTAR_DATA_SYNC_SYMBOLS[i])
|
||||
corr -= val;
|
||||
else
|
||||
corr += val;
|
||||
|
||||
ptr += DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
if (ptr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
ptr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
}
|
||||
|
||||
if (corr > m_maxDataCorr) {
|
||||
m_maxDataCorr = corr;
|
||||
m_frameCount = 0U;
|
||||
|
||||
m_syncPtr = m_dataPtr;
|
||||
|
||||
m_startPtr = m_dataPtr + DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
if (m_startPtr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
m_startPtr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
|
||||
m_maxSyncPtr = m_syncPtr + 1U;
|
||||
if (m_maxSyncPtr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
m_maxSyncPtr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
|
||||
m_minSyncPtr = m_syncPtr + DSTAR_DATA_LENGTH_SAMPLES - 1U;
|
||||
if (m_minSyncPtr >= DSTAR_DATA_LENGTH_SAMPLES)
|
||||
m_minSyncPtr -= DSTAR_DATA_LENGTH_SAMPLES;
|
||||
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
void CDStarRX::samplesToBits(const q15_t* inBuffer, uint16_t start, uint16_t count, uint8_t* outBuffer, uint16_t limit)
|
||||
{
|
||||
for (uint16_t i = 0U; i < count; i++) {
|
||||
q15_t sample = inBuffer[start];
|
||||
|
||||
if (sample < 0)
|
||||
WRITE_BIT2(outBuffer, i, true);
|
||||
else
|
||||
WRITE_BIT2(outBuffer, i, false);
|
||||
|
||||
start += DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
if (start >= limit)
|
||||
start -= limit;
|
||||
}
|
||||
}
|
||||
|
||||
bool CDStarRX::rxHeader(uint8_t* in, uint8_t* out)
|
||||
{
|
||||
int i;
|
||||
|
|
|
|||
31
DStarRX.h
31
DStarRX.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
|
||||
|
|
@ -40,13 +40,21 @@ public:
|
|||
void reset();
|
||||
|
||||
private:
|
||||
uint32_t m_pll;
|
||||
bool m_prev;
|
||||
DSRX_STATE m_rxState;
|
||||
uint32_t m_patternBuffer;
|
||||
uint8_t m_rxBuffer[100U];
|
||||
unsigned int m_rxBufferBits;
|
||||
unsigned int m_dataBits;
|
||||
uint32_t m_bitBuffer[DSTAR_RADIO_SYMBOL_LENGTH];
|
||||
q15_t m_headerBuffer[DSTAR_FEC_SECTION_LENGTH_SAMPLES + 2U * DSTAR_RADIO_SYMBOL_LENGTH];
|
||||
q15_t m_dataBuffer[DSTAR_DATA_LENGTH_SAMPLES];
|
||||
uint16_t m_bitPtr;
|
||||
uint16_t m_headerPtr;
|
||||
uint16_t m_dataPtr;
|
||||
uint16_t m_startPtr;
|
||||
uint16_t m_syncPtr;
|
||||
uint16_t m_minSyncPtr;
|
||||
uint16_t m_maxSyncPtr;
|
||||
q31_t m_maxFrameCorr;
|
||||
q31_t m_maxDataCorr;
|
||||
uint16_t m_frameCount;
|
||||
uint8_t m_countdown;
|
||||
unsigned int m_mar;
|
||||
int m_pathMetric[4U];
|
||||
unsigned int m_pathMemory0[42U];
|
||||
|
|
@ -57,9 +65,12 @@ private:
|
|||
uint32_t m_rssiAccum;
|
||||
uint16_t m_rssiCount;
|
||||
|
||||
void processNone(bool bit);
|
||||
void processHeader(bool bit);
|
||||
void processData(bool bit);
|
||||
void processNone(q15_t sample);
|
||||
void processHeader(q15_t sample);
|
||||
void processData();
|
||||
bool correlateFrameSync();
|
||||
bool correlateDataSync();
|
||||
void samplesToBits(const q15_t* inBuffer, uint16_t start, uint16_t count, uint8_t* outBuffer, uint16_t limit);
|
||||
void writeRSSIHeader(unsigned char* header);
|
||||
void writeRSSIData(unsigned char* data);
|
||||
bool rxHeader(uint8_t* in, uint8_t* out);
|
||||
|
|
|
|||
16
DStarTX.cpp
16
DStarTX.cpp
|
|
@ -201,7 +201,7 @@ m_txDelay(60U) // 100ms
|
|||
{
|
||||
::memset(m_modState, 0x00U, 20U * sizeof(q15_t));
|
||||
|
||||
m_modFilter.L = DSTAR_RADIO_BIT_LENGTH;
|
||||
m_modFilter.L = DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
m_modFilter.phaseLength = GAUSSIAN_0_35_FILTER_PHASE_LEN;
|
||||
m_modFilter.pCoeffs = GAUSSIAN_0_35_FILTER;
|
||||
m_modFilter.pState = m_modState;
|
||||
|
|
@ -219,8 +219,8 @@ 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
|
||||
uint8_t dummy;
|
||||
m_buffer.get(dummy);
|
||||
|
||||
uint8_t header[DSTAR_HEADER_LENGTH_BYTES];
|
||||
|
|
@ -258,8 +258,8 @@ void CDStarTX::process()
|
|||
m_buffer.get(dummy);
|
||||
|
||||
for (uint8_t j = 0U; j < 3U; j++) {
|
||||
for (uint8_t i = 0U; i < DSTAR_EOT_LENGTH_BYTES; i++)
|
||||
m_poBuffer[m_poLen++] = DSTAR_EOT_BYTES[i];
|
||||
for (uint8_t i = 0U; i < DSTAR_END_SYNC_LENGTH_BYTES; i++)
|
||||
m_poBuffer[m_poLen++] = DSTAR_END_SYNC_BYTES[i];
|
||||
}
|
||||
|
||||
m_poPtr = 0U;
|
||||
|
|
@ -268,11 +268,11 @@ void CDStarTX::process()
|
|||
if (m_poLen > 0U) {
|
||||
uint16_t space = io.getSpace();
|
||||
|
||||
while (space > (8U * DSTAR_RADIO_BIT_LENGTH)) {
|
||||
while (space > (8U * DSTAR_RADIO_SYMBOL_LENGTH)) {
|
||||
uint8_t c = m_poBuffer[m_poPtr++];
|
||||
writeByte(c);
|
||||
|
||||
space -= 8U * DSTAR_RADIO_BIT_LENGTH;
|
||||
space -= 8U * DSTAR_RADIO_SYMBOL_LENGTH;
|
||||
|
||||
if (m_poPtr >= m_poLen) {
|
||||
m_poPtr = 0U;
|
||||
|
|
@ -418,7 +418,7 @@ void CDStarTX::txHeader(const uint8_t* in, uint8_t* out) const
|
|||
void CDStarTX::writeByte(uint8_t c)
|
||||
{
|
||||
q15_t inBuffer[8U];
|
||||
q15_t outBuffer[DSTAR_RADIO_BIT_LENGTH * 8U];
|
||||
q15_t outBuffer[DSTAR_RADIO_SYMBOL_LENGTH * 8U];
|
||||
|
||||
uint8_t mask = 0x01U;
|
||||
|
||||
|
|
@ -433,7 +433,7 @@ void CDStarTX::writeByte(uint8_t c)
|
|||
|
||||
::arm_fir_interpolate_q15(&m_modFilter, inBuffer, outBuffer, 8U);
|
||||
|
||||
io.write(STATE_DSTAR, outBuffer, DSTAR_RADIO_BIT_LENGTH * 8U);
|
||||
io.write(STATE_DSTAR, outBuffer, DSTAR_RADIO_SYMBOL_LENGTH * 8U);
|
||||
}
|
||||
|
||||
void CDStarTX::setTXDelay(uint8_t delay)
|
||||
|
|
|
|||
Loading…
Reference in New Issue