mirror of
https://github.com/juribeparada/MMDVM_HS.git
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274 lines
7.6 KiB
C++
274 lines
7.6 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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#define WANT_DEBUG
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#include "Globals.h"
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#include "DMRSlotRX.h"
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#include "DMRSlotType.h"
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#include "Utils.h"
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const uint16_t SCAN_START = 170U;
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const uint16_t SCAN_END = 190U;
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const uint8_t MAX_SYNC_BYTES_ERRS = 1U;
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const uint8_t MAX_SYNC_LOST_FRAMES = 13U;
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const uint16_t NOENDPTR = 9999U;
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const uint8_t CONTROL_NONE = 0x00U;
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const uint8_t CONTROL_VOICE = 0x20U;
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const uint8_t CONTROL_DATA = 0x40U;
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CDMRSlotRX::CDMRSlotRX(bool slot) :
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m_slot(slot),
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m_patternBuffer(0x00U),
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m_buffer(),
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m_dataPtr(0U),
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m_syncPtr(0U),
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m_startPtr(0U),
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m_endPtr(NOENDPTR),
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m_delayPtr(0U),
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m_control(CONTROL_NONE),
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m_syncCount(0U),
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m_colorCode(0U),
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m_delay(0U),
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m_state(DMRRXS_NONE),
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m_n(0U),
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m_type(0U)
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{
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}
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void CDMRSlotRX::start()
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{
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m_dataPtr = 0U;
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m_delayPtr = 0U;
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m_patternBuffer = 0U;
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m_control = CONTROL_NONE;
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}
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void CDMRSlotRX::reset()
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{
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m_syncPtr = 0U;
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m_dataPtr = 0U;
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m_delayPtr = 0U;
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m_control = CONTROL_NONE;
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m_syncCount = 0U;
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m_state = DMRRXS_NONE;
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m_startPtr = 0U;
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m_endPtr = NOENDPTR;
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}
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bool CDMRSlotRX::databit(bool bit)
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{
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m_delayPtr++;
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if (m_delayPtr < m_delay)
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return m_state != DMRRXS_NONE;
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// Ensure that the buffer doesn't overflow
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if (m_dataPtr > m_endPtr || m_dataPtr >= 400U)
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return m_state != DMRRXS_NONE;
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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 (m_state == DMRRXS_NONE) {
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if (m_dataPtr >= SCAN_START && m_dataPtr <= SCAN_END)
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correlateSync(true);
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} else {
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uint16_t min = m_syncPtr - 1U;
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uint16_t max = m_syncPtr + 1U;
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if (m_dataPtr >= min && m_dataPtr <= max)
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correlateSync(false);
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}
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if (m_dataPtr == m_endPtr) {
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uint8_t frame[DMR_FRAME_LENGTH_BYTES + 3U];
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frame[0U] = m_control;
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bitsToBytes(m_startPtr, DMR_FRAME_LENGTH_BYTES, frame + 1U);
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if (m_control == CONTROL_DATA) {
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// Data sync
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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) {
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m_syncCount = 0U;
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m_n = 0U;
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frame[0U] |= dataType;
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switch (dataType) {
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case DT_DATA_HEADER:
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DEBUG3("DMRSlotRX: data header found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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m_state = DMRRXS_DATA;
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m_type = 0x00U;
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break;
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case DT_RATE_12_DATA:
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case DT_RATE_34_DATA:
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case DT_RATE_1_DATA:
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if (m_state == DMRRXS_DATA) {
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DEBUG3("DMRSlotRX: data payload found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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m_type = dataType;
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}
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break;
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case DT_VOICE_LC_HEADER:
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DEBUG3("DMRSlotRX: voice header found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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m_state = DMRRXS_VOICE;
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break;
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case DT_VOICE_PI_HEADER:
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if (m_state == DMRRXS_VOICE) {
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DEBUG3("DMRSlotRX: voice pi header found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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}
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m_state = DMRRXS_VOICE;
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break;
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case DT_TERMINATOR_WITH_LC:
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if (m_state == DMRRXS_VOICE) {
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DEBUG3("DMRSlotRX: voice terminator found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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m_state = DMRRXS_NONE;
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m_endPtr = NOENDPTR;
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}
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break;
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default: // DT_CSBK
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DEBUG3("DMRSlotRX: csbk found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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m_state = DMRRXS_NONE;
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m_endPtr = NOENDPTR;
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break;
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}
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}
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} else if (m_control == CONTROL_VOICE) {
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// Voice sync
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DEBUG3("DMRSlotRX: voice sync found slot/pos", m_slot ? 2U : 1U, m_syncPtr);
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writeRSSIData(frame);
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m_state = DMRRXS_VOICE;
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m_syncCount = 0U;
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m_n = 0U;
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} else {
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if (m_state != DMRRXS_NONE) {
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m_syncCount++;
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if (m_syncCount >= MAX_SYNC_LOST_FRAMES) {
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serial.writeDMRLost(m_slot);
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m_state = DMRRXS_NONE;
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m_endPtr = NOENDPTR;
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}
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}
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if (m_state == DMRRXS_VOICE) {
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if (m_n >= 5U) {
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frame[0U] = CONTROL_VOICE;
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m_n = 0U;
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} else {
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frame[0U] = ++m_n;
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}
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serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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} else if (m_state == DMRRXS_DATA) {
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if (m_type != 0x00U) {
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frame[0U] = CONTROL_DATA | m_type;
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writeRSSIData(frame);
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}
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}
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}
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}
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m_dataPtr++;
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return m_state != DMRRXS_NONE;
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}
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void CDMRSlotRX::correlateSync(bool first)
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{
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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_control = CONTROL_DATA;
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m_syncPtr = m_dataPtr;
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m_startPtr = m_dataPtr - DMR_SLOT_TYPE_LENGTH_BITS / 2U - DMR_INFO_LENGTH_BITS / 2U - DMR_SYNC_LENGTH_BITS + 1;
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m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_BITS / 2U + DMR_INFO_LENGTH_BITS / 2U;
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DEBUG4("SYNC corr MS Data found pos/start/end:", m_dataPtr, m_startPtr, m_endPtr);
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} else if (countBits64((m_patternBuffer & DMR_SYNC_BITS_MASK) ^ DMR_MS_VOICE_SYNC_BITS) <= MAX_SYNC_BYTES_ERRS) {
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m_control = CONTROL_VOICE;
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m_syncPtr = m_dataPtr;
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m_startPtr = m_dataPtr - DMR_SLOT_TYPE_LENGTH_BITS / 2U - DMR_INFO_LENGTH_BITS / 2U - DMR_SYNC_LENGTH_BITS + 1;
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m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_BITS / 2U + DMR_INFO_LENGTH_BITS / 2U;
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DEBUG4("SYNC corr MS Voice found pos/start/end: ", m_dataPtr, m_startPtr, m_endPtr);
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}
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}
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void CDMRSlotRX::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 + 0U] & 0x01) << 7);
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buffer[i] |= ((m_buffer[start + 1U] & 0x01) << 6);
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buffer[i] |= ((m_buffer[start + 2U] & 0x01) << 5);
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buffer[i] |= ((m_buffer[start + 3U] & 0x01) << 4);
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buffer[i] |= ((m_buffer[start + 4U] & 0x01) << 3);
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buffer[i] |= ((m_buffer[start + 5U] & 0x01) << 2);
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buffer[i] |= ((m_buffer[start + 6U] & 0x01) << 1);
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buffer[i] |= ((m_buffer[start + 7U] & 0x01) << 0);
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start += 8U;
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}
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}
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void CDMRSlotRX::setColorCode(uint8_t colorCode)
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{
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m_colorCode = colorCode;
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}
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void CDMRSlotRX::setDelay(uint8_t delay)
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{
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m_delay = delay;
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}
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void CDMRSlotRX::writeRSSIData(uint8_t* frame)
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{
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#if defined(SEND_RSSI_DATA)
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uint16_t rssi = io.readRSSI();
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frame[34U] = (rssi >> 8) & 0xFFU;
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frame[35U] = (rssi >> 0) & 0xFFU;
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serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 3U);
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#else
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serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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#endif
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}
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#endif
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