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DStarRX.h
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DStarRX.h
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/*
* 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
* 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"
#if defined(MODE_DSTAR)
#if !defined(DSTARRX_H)
#define DSTARRX_H
#include "DStarDefines.h"
enum DSRX_STATE {
DSRXS_NONE,
DSRXS_HEADER,
DSRXS_DATA
};
class CDStarRX {
public:
CDStarRX();
void samples(const q15_t* samples, const uint16_t* rssi, uint8_t length);
void reset();
private:
DSRX_STATE m_rxState;
uint64_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];
unsigned int m_pathMemory1[42U];
unsigned int m_pathMemory2[42U];
unsigned int m_pathMemory3[42U];
uint8_t m_fecOutput[42U];
uint32_t m_rssiAccum;
uint16_t m_rssiCount;
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);
void acs(int* metric);
void viterbiDecode(int* data);
void traceBack();
bool checksum(const uint8_t* header) const;
};
#endif
#endif