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https://github.com/g4klx/MMDVM.git
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First compiling version of DMO code, untested.
This commit is contained in:
Jonathan Naylor
parent
d477796903
commit
35ae6b002d
7 changed files with 523 additions and 14 deletions
405
DMRDMORX.cpp
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405
DMRDMORX.cpp
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/*
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* Copyright (C) 2009-2016 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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#define WANT_DEBUG
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#include "Config.h"
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#include "Globals.h"
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#include "DMRDMORX.h"
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#include "DMRSlotType.h"
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#include "Utils.h"
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const q15_t SCALING_FACTOR = 19505; // Q15(0.60)
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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 uint8_t MAX_SYNC_LOST_FRAMES = 13U;
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const uint8_t BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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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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CDMRDMORX::CDMRDMORX() :
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m_bitBuffer(),
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m_buffer(),
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m_bitPtr(0U),
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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_maxCorr(0),
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m_centre(),
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m_threshold(),
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m_averagePtr(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_state(DMORXS_NONE),
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m_n(0U),
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m_type(0U),
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m_rssiCount(0U),
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m_rssi(0U)
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{
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}
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void CDMRDMORX::start()
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{
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m_dataPtr = 0U;
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m_bitPtr = 0U;
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m_maxCorr = 0;
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m_control = CONTROL_NONE;
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}
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void CDMRDMORX::reset()
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{
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m_syncPtr = 0U;
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m_dataPtr = 0U;
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m_bitPtr = 0U;
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m_maxCorr = 0;
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m_control = CONTROL_NONE;
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m_syncCount = 0U;
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m_state = DMORXS_NONE;
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m_startPtr = 0U;
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m_endPtr = NOENDPTR;
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m_rssiCount = 0U;
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}
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void CDMRDMORX::samples(const q15_t* samples, uint8_t length)
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{
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bool dcd = false;
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for (uint8_t i = 0U; i < length; i++)
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dcd = processSample(samples[i]);
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io.setDecode(dcd);
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}
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bool CDMRDMORX::processSample(q15_t sample)
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{
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if (m_state != DMORXS_NONE) {
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if (m_dataPtr > m_startPtr && m_dataPtr < m_endPtr)
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io.setADCDetection(true);
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else
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io.setADCDetection(false);
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} else {
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io.setADCDetection(false);
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}
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m_buffer[m_dataPtr] = sample;
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m_bitBuffer[m_bitPtr] <<= 1;
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if (sample < 0)
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m_bitBuffer[m_bitPtr] |= 0x01U;
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if (m_state == DMORXS_NONE) {
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correlateSync(true);
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} else {
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#if defined(SEND_RSSI_DATA)
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// Grab the RSSI data during the frame
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if (m_state == DMORXS_VOICE && m_dataPtr == m_syncPtr && m_rssiCount == 2U)
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m_rssi = io.getRSSIValue();
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#endif
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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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// Find the average centre and threshold values
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q15_t centre = (m_centre[0U] + m_centre[1U] + m_centre[2U] + m_centre[3U]) >> 2;
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q15_t threshold = (m_threshold[0U] + m_threshold[1U] + m_threshold[2U] + m_threshold[3U]) >> 2;
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uint8_t frame[DMR_FRAME_LENGTH_BYTES + 3U];
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frame[0U] = m_control;
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uint16_t ptr = m_endPtr - DMR_FRAME_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH + 1U;
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samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
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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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DEBUG4("DMRDMORX: data header found pos/centre/threshold", m_syncPtr, centre, threshold);
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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m_state = DMORXS_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 == DMORXS_DATA) {
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DEBUG4("DMRDMORX: data payload found pos/centre/threshold", m_syncPtr, centre, threshold);
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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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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DEBUG4("DMRDMORX: voice header found pos/centre/threshold", m_syncPtr, centre, threshold);
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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m_state = DMORXS_VOICE;
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break;
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case DT_VOICE_PI_HEADER:
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if (m_state == DMORXS_VOICE) {
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DEBUG4("DMRDMORX: voice pi header found pos/centre/threshold", m_syncPtr, centre, threshold);
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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}
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m_state = DMORXS_VOICE;
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break;
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case DT_TERMINATOR_WITH_LC:
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if (m_state == DMORXS_VOICE) {
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DEBUG4("DMRDMORX: voice terminator found pos/centre/threshold", m_syncPtr, centre, threshold);
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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m_state = DMORXS_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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DEBUG4("DMRDMORX: csbk found pos/centre/threshold", m_syncPtr, centre, threshold);
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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m_state = DMORXS_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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DEBUG4("DMRDMORX: voice sync found pos/centre/threshold", m_syncPtr, centre, threshold);
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#if defined(SEND_RSSI_DATA)
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// Send RSSI data approximately every second
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if (m_rssiCount == 2U) {
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frame[34U] = (m_rssi >> 8) & 0xFFU;
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frame[35U] = (m_rssi >> 0) & 0xFFU;
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 3U);
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} else {
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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}
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m_rssiCount++;
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if (m_rssiCount >= 16U)
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m_rssiCount = 0U;
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#else
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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#endif
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m_state = DMORXS_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 != DMORXS_NONE) {
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m_syncCount++;
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if (m_syncCount >= MAX_SYNC_LOST_FRAMES) {
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serial.writeDMRLost(true);
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m_state = DMORXS_NONE;
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m_endPtr = NOENDPTR;
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}
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}
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if (m_state == DMORXS_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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#if defined(SEND_RSSI_DATA)
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// Send RSSI data approximately every second
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if (m_rssiCount == 2U) {
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frame[34U] = (m_rssi >> 8) & 0xFFU;
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frame[35U] = (m_rssi >> 0) & 0xFFU;
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 3U);
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} else {
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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}
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m_rssiCount++;
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if (m_rssiCount >= 16U)
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m_rssiCount = 0U;
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#else
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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#endif
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} else if (m_state == DMORXS_DATA) {
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if (m_type != 0x00U) {
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frame[0U] = CONTROL_DATA | m_type;
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serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
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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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if (m_dataPtr >= DMO_BUFFER_SIZE)
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m_dataPtr = 0U;
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m_bitPtr++;
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if (m_bitPtr >= DMR_RADIO_SYMBOL_LENGTH)
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m_bitPtr = 0U;
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return m_state != DMORXS_NONE;
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}
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void CDMRDMORX::correlateSync(bool first)
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{
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uint8_t errs = countBits32((m_bitBuffer[m_bitPtr] & DMR_SYNC_SYMBOLS_MASK) ^ DMR_S2_DATA_SYNC_SYMBOLS);
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// The voice sync is the complement of the data sync
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bool data = (errs <= MAX_SYNC_SYMBOLS_ERRS);
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bool voice = (errs >= (DMR_SYNC_LENGTH_SYMBOLS - MAX_SYNC_SYMBOLS_ERRS));
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if (data || voice) {
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uint16_t ptr = m_dataPtr - DMR_SYNC_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH;
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q31_t corr = 0;
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q15_t min = 16000;
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q15_t max = -16000;
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uint32_t mask = 0x00800000U;
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for (uint8_t i = 0U; i < DMR_SYNC_LENGTH_SYMBOLS; i++, mask >>= 1) {
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bool b = (DMR_MS_DATA_SYNC_SYMBOLS & mask) == mask;
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if (m_buffer[ptr] > max)
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max = m_buffer[ptr];
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if (m_buffer[ptr] < min)
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min = m_buffer[ptr];
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if (data)
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corr += b ? -m_buffer[ptr] : m_buffer[ptr];
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else // if (voice)
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corr += b ? m_buffer[ptr] : -m_buffer[ptr];
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ptr += DMR_RADIO_SYMBOL_LENGTH;
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}
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if (corr > m_maxCorr) {
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q15_t centre = (max + min) >> 1;
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q31_t v1 = (max - centre) * SCALING_FACTOR;
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q15_t threshold = q15_t(v1 >> 15);
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uint8_t sync[DMR_SYNC_BYTES_LENGTH];
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uint16_t ptr = m_dataPtr - DMR_SYNC_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH;
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samplesToBits(ptr, DMR_SYNC_LENGTH_SYMBOLS, sync, 4U, centre, threshold);
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if (data) {
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uint8_t errs = 0U;
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for (uint8_t i = 0U; i < DMR_SYNC_BYTES_LENGTH; i++)
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errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_S2_DATA_SYNC_BYTES[i]);
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if (errs <= MAX_SYNC_BYTES_ERRS) {
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if (first) {
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m_threshold[0U] = m_threshold[1U] = m_threshold[2U] = m_threshold[3U] = threshold;
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m_centre[0U] = m_centre[1U] = m_centre[2U] = m_centre[3U] = centre;
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m_averagePtr = 0U;
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m_rssiCount = 0U;
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} else {
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m_threshold[m_averagePtr] = threshold;
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m_centre[m_averagePtr] = centre;
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m_averagePtr++;
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if (m_averagePtr >= 4U)
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m_averagePtr = 0U;
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}
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m_maxCorr = corr;
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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_SAMPLES / 2U - DMR_INFO_LENGTH_SAMPLES / 2U - DMR_SYNC_LENGTH_SAMPLES;
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m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
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}
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} else { // if (voice)
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uint8_t errs = 0U;
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for (uint8_t i = 0U; i < DMR_SYNC_BYTES_LENGTH; i++)
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errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_S2_VOICE_SYNC_BYTES[i]);
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if (errs <= MAX_SYNC_BYTES_ERRS) {
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if (first) {
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m_threshold[0U] = m_threshold[1U] = m_threshold[2U] = m_threshold[3U] = threshold;
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m_centre[0U] = m_centre[1U] = m_centre[2U] = m_centre[3U] = centre;
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m_averagePtr = 0U;
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m_rssiCount = 0U;
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} else {
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m_threshold[m_averagePtr] = threshold;
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m_centre[m_averagePtr] = centre;
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m_averagePtr++;
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if (m_averagePtr >= 4U)
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m_averagePtr = 0U;
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}
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m_maxCorr = corr;
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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_SAMPLES / 2U - DMR_INFO_LENGTH_SAMPLES / 2U - DMR_SYNC_LENGTH_SAMPLES;
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m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
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}
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}
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}
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}
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}
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void CDMRDMORX::samplesToBits(uint16_t start, uint8_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold)
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{
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for (uint8_t i = 0U; i < count; i++, start += DMR_RADIO_SYMBOL_LENGTH) {
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q15_t sample = m_buffer[start] - centre;
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if (sample < -threshold) {
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WRITE_BIT1(buffer, offset, false);
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offset++;
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WRITE_BIT1(buffer, offset, true);
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offset++;
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} else if (sample < 0) {
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WRITE_BIT1(buffer, offset, false);
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offset++;
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WRITE_BIT1(buffer, offset, false);
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offset++;
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} else if (sample < threshold) {
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WRITE_BIT1(buffer, offset, true);
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offset++;
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WRITE_BIT1(buffer, offset, false);
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offset++;
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} else {
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WRITE_BIT1(buffer, offset, true);
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offset++;
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WRITE_BIT1(buffer, offset, true);
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offset++;
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}
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}
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}
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void CDMRDMORX::setColorCode(uint8_t colorCode)
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{
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m_colorCode = colorCode;
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}
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