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694b83123a
In to NXDN possible problem on sinc filter anc isinc filter, think they must be recalculated but do not know how to do it. On D-STAR, DMR, C4FM and P25 it work.
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/*
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* Copyright (C) 2015,2016,2017 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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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(DSTARRX_H)
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#define DSTARRX_H
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#include "Config.h"
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#include "DStarDefines.h"
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enum DSRX_STATE {
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DSRXS_NONE,
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DSRXS_HEADER,
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DSRXS_DATA
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};
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class CDStarRX {
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public:
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CDStarRX();
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void samples(const q15_t* samples, const uint16_t* rssi, uint8_t length);
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void reset();
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private:
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DSRX_STATE m_rxState;
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uint32_t m_bitBuffer[DSTAR_RADIO_SYMBOL_LENGTH];
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q15_t m_headerBuffer[DSTAR_FEC_SECTION_LENGTH_SAMPLES + 2U * DSTAR_RADIO_SYMBOL_LENGTH];
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q15_t m_dataBuffer[DSTAR_DATA_LENGTH_SAMPLES];
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uint16_t m_bitPtr;
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uint16_t m_headerPtr;
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uint16_t m_dataPtr;
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uint16_t m_startPtr;
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uint16_t m_syncPtr;
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uint16_t m_minSyncPtr;
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uint16_t m_maxSyncPtr;
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q31_t m_maxFrameCorr;
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q31_t m_maxDataCorr;
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uint16_t m_frameCount;
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uint8_t m_countdown;
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unsigned int m_mar;
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int m_pathMetric[4U];
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unsigned int m_pathMemory0[42U];
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unsigned int m_pathMemory1[42U];
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unsigned int m_pathMemory2[42U];
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unsigned int m_pathMemory3[42U];
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uint8_t m_fecOutput[42U];
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uint32_t m_rssiAccum;
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uint16_t m_rssiCount;
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void processNone(q15_t sample);
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void processHeader(q15_t sample);
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void processData();
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bool correlateFrameSync();
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bool correlateDataSync();
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void samplesToBits(const q15_t* inBuffer, uint16_t start, uint16_t count, uint8_t* outBuffer, uint16_t limit);
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void writeRSSIHeader(unsigned char* header);
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void writeRSSIData(unsigned char* data);
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bool rxHeader(uint8_t* in, uint8_t* out);
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void acs(int* metric);
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void viterbiDecode(int* data);
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void traceBack();
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bool checksum(const uint8_t* header) const;
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};
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#endif
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