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NXDN first cut, not working yet.

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Jonathan Naylor
2018-01-10 20:30:35 +00:00
parent 78a51d416d
commit b5ca5e3839
16 changed files with 1005 additions and 23 deletions
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NXDNRX.h
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/*
* Copyright (C) 2015,2016,2017,2018 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(NXDNRX_H)
#define NXDNRX_H
#include "Config.h"
#include "NXDNDefines.h"
enum NXDNRX_STATE {
NXDNRXS_NONE,
NXDNRXS_DATA
};
class CNXDNRX {
public:
CNXDNRX();
void samples(const q15_t* samples, uint16_t* rssi, uint8_t length);
void reset();
private:
NXDNRX_STATE m_state;
uint32_t m_bitBuffer[NXDN_RADIO_SYMBOL_LENGTH];
q15_t m_buffer[NXDN_FRAME_LENGTH_SAMPLES];
uint16_t m_bitPtr;
uint16_t m_dataPtr;
uint16_t m_startPtr;
uint16_t m_endPtr;
uint16_t m_syncPtr;
uint16_t m_minSyncPtr;
uint16_t m_maxSyncPtr;
q31_t m_maxCorr;
uint16_t m_lostCount;
uint8_t m_countdown;
q15_t m_centre[16U];
q15_t m_centreVal;
q15_t m_threshold[16U];
q15_t m_thresholdVal;
uint8_t m_averagePtr;
uint32_t m_rssiAccum;
uint16_t m_rssiCount;
void processNone(q15_t sample);
void processData(q15_t sample);
bool correlateSync();
void calculateLevels(uint16_t start, uint16_t count);
void samplesToBits(uint16_t start, uint16_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
void writeRSSIData(uint8_t* data);
};
#endif