mirror of https://github.com/markqvist/MMDVM.git
73 lines
2.0 KiB
C++
73 lines
2.0 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(P25RX_H)
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#define P25RX_H
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#include "Config.h"
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#include "P25Defines.h"
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enum P25RX_STATE {
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P25RXS_NONE,
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P25RXS_HDR,
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P25RXS_LDU
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};
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class CP25RX {
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public:
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CP25RX();
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void samples(const q15_t* samples, uint16_t* rssi, uint8_t length);
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void reset();
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private:
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P25RX_STATE m_state;
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uint32_t m_bitBuffer[P25_RADIO_SYMBOL_LENGTH];
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q15_t m_buffer[P25_LDU_FRAME_LENGTH_SAMPLES];
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uint16_t m_bitPtr;
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uint16_t m_dataPtr;
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uint16_t m_hdrStartPtr;
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uint16_t m_lduStartPtr;
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uint16_t m_lduEndPtr;
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uint16_t m_minSyncPtr;
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uint16_t m_maxSyncPtr;
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uint16_t m_hdrSyncPtr;
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uint16_t m_lduSyncPtr;
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q31_t m_maxCorr;
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uint16_t m_lostCount;
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uint8_t m_countdown;
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q15_t m_centre[16U];
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q15_t m_centreVal;
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q15_t m_threshold[16U];
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q15_t m_thresholdVal;
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uint8_t m_averagePtr;
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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 processHdr(q15_t sample);
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void processLdu(q15_t sample);
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bool correlateSync();
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void calculateLevels(uint16_t start, uint16_t count);
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void samplesToBits(uint16_t start, uint16_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
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void writeRSSILdu(uint8_t* ldu);
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};
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#endif
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