mirror of
https://github.com/g4klx/MMDVM_HS.git
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131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
/*
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* Copyright (C) 2009-2017 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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* 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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#include "Config.h"
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#if defined(DUPLEX)
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#include "Globals.h"
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#include "DMRIdleRX.h"
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#include "DMRSlotType.h"
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#include "Utils.h"
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const uint8_t MAX_SYNC_SYMBOLS_ERRS = 2U;
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const uint8_t MAX_SYNC_BYTES_ERRS = 3U;
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const uint16_t NOENDPTR = 9999U;
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const uint8_t CONTROL_IDLE = 0x80U;
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const uint8_t CONTROL_DATA = 0x40U;
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CDMRIdleRX::CDMRIdleRX() :
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m_buffer(),
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m_dataPtr(0U),
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m_endPtr(NOENDPTR),
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m_colorCode(0U)
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{
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}
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void CDMRIdleRX::reset()
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{
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m_dataPtr = 0U;
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m_endPtr = NOENDPTR;
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}
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void CDMRIdleRX::databit(bool bit)
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{
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m_buffer[m_dataPtr] = bit;
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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 (countBits64((m_patternBuffer & DMR_SYNC_BITS_MASK) ^ DMR_MS_DATA_SYNC_BITS) <= MAX_SYNC_BYTES_ERRS) {
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m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_BITS / 2U + DMR_INFO_LENGTH_BITS / 2U;
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if (m_endPtr >= DMR_FRAME_LENGTH_BITS)
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m_endPtr -= DMR_FRAME_LENGTH_BITS;
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// DEBUG3("SYNC MS Data found pos/end:", m_dataPtr, m_endPtr);
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}
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if (m_dataPtr == m_endPtr) {
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uint16_t ptr = m_endPtr + 1;
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if (ptr >= DMR_FRAME_LENGTH_BITS)
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ptr -= DMR_FRAME_LENGTH_BITS;
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uint8_t frame[DMR_FRAME_LENGTH_BYTES + 1U];
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bitsToBytes(ptr, DMR_FRAME_LENGTH_BYTES, frame + 1U);
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uint8_t colorCode;
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uint8_t dataType;
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CDMRSlotType slotType;
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slotType.decode(frame + 1U, colorCode, dataType);
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if (colorCode == m_colorCode && dataType == DT_CSBK) {
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frame[0U] = CONTROL_IDLE | CONTROL_DATA | DT_CSBK;
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serial.writeDMRData(false, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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}
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m_endPtr = NOENDPTR;
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}
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m_dataPtr++;
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if (m_dataPtr >= DMR_FRAME_LENGTH_BITS)
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m_dataPtr = 0U;
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}
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void CDMRIdleRX::bitsToBytes(uint16_t start, uint8_t count, uint8_t* buffer)
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{
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for (uint8_t i = 0U; i < count; i++) {
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buffer[i] = 0U;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 7);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 6);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 5);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 4);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 3);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 2);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 1);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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buffer[i] |= ((m_buffer[start++] & 0x01) << 0);
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if (start >= DMR_FRAME_LENGTH_BITS)
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start -= DMR_FRAME_LENGTH_BITS;
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}
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}
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void CDMRIdleRX::setColorCode(uint8_t colorCode)
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{
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m_colorCode = colorCode;
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}
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#endif
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