mirror of
https://github.com/g4klx/MMDVM.git
synced 2026-02-16 04:35:38 +01:00
694b83123a
In to NXDN possible problem on sinc filter anc isinc filter, think they must be recalculated but do not know how to do it. On D-STAR, DMR, C4FM and P25 it work.
426 lines
13 KiB
C++
426 lines
13 KiB
C++
/*
|
|
* Copyright (C) 2009-2017 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.
|
|
*/
|
|
|
|
#include "Config.h"
|
|
#include "Globals.h"
|
|
#include "DMRDMORX.h"
|
|
#include "DMRSlotType.h"
|
|
#include "Utils.h"
|
|
|
|
const q15_t SCALING_FACTOR = 19505; // Q15(0.60)
|
|
|
|
const uint8_t MAX_SYNC_SYMBOLS_ERRS = 4U;
|
|
const uint8_t MAX_SYNC_BYTES_ERRS = 6U;
|
|
|
|
const uint8_t MAX_SYNC_LOST_FRAMES = 26U;
|
|
|
|
const uint8_t BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
|
|
|
|
#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])
|
|
|
|
const uint16_t NOENDPTR = 9999U;
|
|
|
|
const uint8_t CONTROL_NONE = 0x00U;
|
|
const uint8_t CONTROL_VOICE = 0x20U;
|
|
const uint8_t CONTROL_DATA = 0x40U;
|
|
|
|
CDMRDMORX::CDMRDMORX() :
|
|
m_bitBuffer(),
|
|
m_buffer(),
|
|
m_bitPtr(0U),
|
|
m_dataPtr(0U),
|
|
m_syncPtr(0U),
|
|
m_startPtr(0U),
|
|
m_endPtr(NOENDPTR),
|
|
m_maxCorr(0),
|
|
m_centre(),
|
|
m_threshold(),
|
|
m_averagePtr(0U),
|
|
m_control(CONTROL_NONE),
|
|
m_syncCount(0U),
|
|
m_colorCode(0U),
|
|
m_state(DMORXS_NONE),
|
|
m_n(0U),
|
|
m_type(0U),
|
|
m_rssi()
|
|
{
|
|
}
|
|
|
|
void CDMRDMORX::reset()
|
|
{
|
|
m_syncPtr = 0U;
|
|
m_maxCorr = 0;
|
|
m_control = CONTROL_NONE;
|
|
m_syncCount = 0U;
|
|
m_state = DMORXS_NONE;
|
|
m_startPtr = 0U;
|
|
m_endPtr = NOENDPTR;
|
|
}
|
|
|
|
void CDMRDMORX::samples(const q15_t* samples, const uint16_t* rssi, uint8_t length)
|
|
{
|
|
bool dcd = false;
|
|
|
|
for (uint8_t i = 0U; i < length; i++)
|
|
dcd = processSample(samples[i], rssi[i]);
|
|
|
|
io.setDecode(dcd);
|
|
}
|
|
|
|
bool CDMRDMORX::processSample(q15_t sample, uint16_t rssi)
|
|
{
|
|
m_buffer[m_dataPtr] = sample;
|
|
m_rssi[m_dataPtr] = rssi;
|
|
|
|
m_bitBuffer[m_bitPtr] <<= 1;
|
|
if (sample < 0)
|
|
m_bitBuffer[m_bitPtr] |= 0x01U;
|
|
|
|
if (m_state == DMORXS_NONE) {
|
|
correlateSync(true);
|
|
} else {
|
|
|
|
uint16_t min = m_syncPtr + DMO_BUFFER_LENGTH_SAMPLES - 1U;
|
|
uint16_t max = m_syncPtr + 1U;
|
|
|
|
if (min >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
min -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
if (max >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
max -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
|
|
if (min < max) {
|
|
if (m_dataPtr >= min && m_dataPtr <= max)
|
|
correlateSync(false);
|
|
} else {
|
|
if (m_dataPtr >= min || m_dataPtr <= max)
|
|
correlateSync(false);
|
|
}
|
|
}
|
|
|
|
if (m_dataPtr == m_endPtr) {
|
|
// Find the average centre and threshold values
|
|
q15_t centre = (m_centre[0U] + m_centre[1U] + m_centre[2U] + m_centre[3U]) >> 2;
|
|
q15_t threshold = (m_threshold[0U] + m_threshold[1U] + m_threshold[2U] + m_threshold[3U]) >> 2;
|
|
|
|
uint8_t frame[DMR_FRAME_LENGTH_BYTES + 3U];
|
|
frame[0U] = m_control;
|
|
|
|
uint16_t ptr = m_endPtr + DMO_BUFFER_LENGTH_SAMPLES - DMR_FRAME_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH + 1U;
|
|
if (ptr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
ptr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
|
|
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
|
|
|
|
if (m_control == CONTROL_DATA) {
|
|
// Data sync
|
|
uint8_t colorCode;
|
|
uint8_t dataType;
|
|
CDMRSlotType slotType;
|
|
slotType.decode(frame + 1U, colorCode, dataType);
|
|
|
|
if (colorCode == m_colorCode) {
|
|
m_syncCount = 0U;
|
|
m_n = 0U;
|
|
|
|
frame[0U] |= dataType;
|
|
|
|
switch (dataType) {
|
|
case DT_DATA_HEADER:
|
|
DEBUG4("DMRDMORX: data header found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
m_state = DMORXS_DATA;
|
|
m_type = 0x00U;
|
|
break;
|
|
case DT_RATE_12_DATA:
|
|
case DT_RATE_34_DATA:
|
|
case DT_RATE_1_DATA:
|
|
if (m_state == DMORXS_DATA) {
|
|
DEBUG4("DMRDMORX: data payload found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
m_type = dataType;
|
|
}
|
|
break;
|
|
case DT_VOICE_LC_HEADER:
|
|
DEBUG4("DMRDMORX: voice header found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
m_state = DMORXS_VOICE;
|
|
break;
|
|
case DT_VOICE_PI_HEADER:
|
|
if (m_state == DMORXS_VOICE) {
|
|
DEBUG4("DMRDMORX: voice pi header found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
}
|
|
m_state = DMORXS_VOICE;
|
|
break;
|
|
case DT_TERMINATOR_WITH_LC:
|
|
if (m_state == DMORXS_VOICE) {
|
|
DEBUG4("DMRDMORX: voice terminator found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
reset();
|
|
}
|
|
break;
|
|
default: // DT_CSBK
|
|
DEBUG4("DMRDMORX: csbk found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
reset();
|
|
break;
|
|
}
|
|
}
|
|
} else if (m_control == CONTROL_VOICE) {
|
|
// Voice sync
|
|
DEBUG4("DMRDMORX: voice sync found pos/centre/threshold", m_syncPtr, centre, threshold);
|
|
writeRSSIData(frame);
|
|
m_state = DMORXS_VOICE;
|
|
m_syncCount = 0U;
|
|
m_n = 0U;
|
|
} else {
|
|
if (m_state != DMORXS_NONE) {
|
|
m_syncCount++;
|
|
if (m_syncCount >= MAX_SYNC_LOST_FRAMES) {
|
|
serial.writeDMRLost(true);
|
|
reset();
|
|
}
|
|
}
|
|
|
|
if (m_state == DMORXS_VOICE) {
|
|
if (m_n >= 5U) {
|
|
frame[0U] = CONTROL_VOICE;
|
|
m_n = 0U;
|
|
} else {
|
|
frame[0U] = ++m_n;
|
|
}
|
|
|
|
serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
|
|
} else if (m_state == DMORXS_DATA) {
|
|
if (m_type != 0x00U) {
|
|
frame[0U] = CONTROL_DATA | m_type;
|
|
writeRSSIData(frame);
|
|
}
|
|
}
|
|
}
|
|
|
|
// End of this slot, reset some items for the next slot.
|
|
m_maxCorr = 0;
|
|
m_control = CONTROL_NONE;
|
|
}
|
|
|
|
m_dataPtr++;
|
|
if (m_dataPtr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
m_dataPtr = 0U;
|
|
|
|
m_bitPtr++;
|
|
if (m_bitPtr >= DMR_RADIO_SYMBOL_LENGTH)
|
|
m_bitPtr = 0U;
|
|
|
|
return m_state != DMORXS_NONE;
|
|
}
|
|
|
|
void CDMRDMORX::correlateSync(bool first)
|
|
{
|
|
uint8_t errs = countBits32((m_bitBuffer[m_bitPtr] & DMR_SYNC_SYMBOLS_MASK) ^ DMR_MS_DATA_SYNC_SYMBOLS);
|
|
|
|
// The voice sync is the complement of the data sync
|
|
bool data = (errs <= MAX_SYNC_SYMBOLS_ERRS);
|
|
bool voice = (errs >= (DMR_SYNC_LENGTH_SYMBOLS - MAX_SYNC_SYMBOLS_ERRS));
|
|
|
|
if (data || voice) {
|
|
uint16_t ptr = m_dataPtr + DMO_BUFFER_LENGTH_SAMPLES - DMR_SYNC_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH;
|
|
if (ptr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
ptr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
|
|
q31_t corr = 0;
|
|
q15_t min = 16000;
|
|
q15_t max = -16000;
|
|
|
|
for (uint8_t i = 0U; i < DMR_SYNC_LENGTH_SYMBOLS; i++) {
|
|
q15_t val = m_buffer[ptr];
|
|
|
|
if (val > max)
|
|
max = val;
|
|
if (val < min)
|
|
min = val;
|
|
|
|
int8_t corrVal;
|
|
if (data)
|
|
corrVal = DMR_MS_DATA_SYNC_SYMBOLS_VALUES[i];
|
|
else
|
|
corrVal = DMR_MS_VOICE_SYNC_SYMBOLS_VALUES[i];
|
|
|
|
switch (corrVal) {
|
|
case +3:
|
|
corr -= (val + val + val);
|
|
break;
|
|
case +1:
|
|
corr -= val;
|
|
break;
|
|
case -1:
|
|
corr += val;
|
|
break;
|
|
default: // -3
|
|
corr += (val + val + val);
|
|
break;
|
|
}
|
|
|
|
ptr += DMR_RADIO_SYMBOL_LENGTH;
|
|
if (ptr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
ptr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
}
|
|
|
|
if (corr > m_maxCorr) {
|
|
q15_t centre = (max + min) >> 1;
|
|
|
|
q31_t v1 = (max - centre) * SCALING_FACTOR;
|
|
q15_t threshold = q15_t(v1 >> 15);
|
|
|
|
uint8_t sync[DMR_SYNC_BYTES_LENGTH];
|
|
uint16_t ptr = m_dataPtr + DMO_BUFFER_LENGTH_SAMPLES - DMR_SYNC_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH;
|
|
if (ptr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
ptr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
|
|
samplesToBits(ptr, DMR_SYNC_LENGTH_SYMBOLS, sync, 4U, centre, threshold);
|
|
|
|
if (data) {
|
|
uint8_t errs = 0U;
|
|
for (uint8_t i = 0U; i < DMR_SYNC_BYTES_LENGTH; i++)
|
|
errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_DATA_SYNC_BYTES[i]);
|
|
|
|
if (errs <= MAX_SYNC_BYTES_ERRS) {
|
|
if (first) {
|
|
m_threshold[0U] = m_threshold[1U] = m_threshold[2U] = m_threshold[3U] = threshold;
|
|
m_centre[0U] = m_centre[1U] = m_centre[2U] = m_centre[3U] = centre;
|
|
m_averagePtr = 0U;
|
|
} else {
|
|
m_threshold[m_averagePtr] = threshold;
|
|
m_centre[m_averagePtr] = centre;
|
|
|
|
m_averagePtr++;
|
|
if (m_averagePtr >= 4U)
|
|
m_averagePtr = 0U;
|
|
}
|
|
|
|
m_maxCorr = corr;
|
|
m_control = CONTROL_DATA;
|
|
m_syncPtr = m_dataPtr;
|
|
|
|
m_startPtr = m_dataPtr + DMO_BUFFER_LENGTH_SAMPLES - DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U - DMR_INFO_LENGTH_SAMPLES / 2U - DMR_SYNC_LENGTH_SAMPLES;
|
|
if (m_startPtr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
m_startPtr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
|
|
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
|
|
if (m_endPtr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
m_endPtr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
}
|
|
} else { // if (voice1 || voice2)
|
|
uint8_t errs = 0U;
|
|
for (uint8_t i = 0U; i < DMR_SYNC_BYTES_LENGTH; i++)
|
|
errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_VOICE_SYNC_BYTES[i]);
|
|
|
|
if (errs <= MAX_SYNC_BYTES_ERRS) {
|
|
if (first) {
|
|
m_threshold[0U] = m_threshold[1U] = m_threshold[2U] = m_threshold[3U] = threshold;
|
|
m_centre[0U] = m_centre[1U] = m_centre[2U] = m_centre[3U] = centre;
|
|
m_averagePtr = 0U;
|
|
} else {
|
|
m_threshold[m_averagePtr] = threshold;
|
|
m_centre[m_averagePtr] = centre;
|
|
|
|
m_averagePtr++;
|
|
if (m_averagePtr >= 4U)
|
|
m_averagePtr = 0U;
|
|
}
|
|
|
|
m_maxCorr = corr;
|
|
m_control = CONTROL_VOICE;
|
|
m_syncPtr = m_dataPtr;
|
|
|
|
m_startPtr = m_dataPtr + DMO_BUFFER_LENGTH_SAMPLES - DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U - DMR_INFO_LENGTH_SAMPLES / 2U - DMR_SYNC_LENGTH_SAMPLES;
|
|
if (m_startPtr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
m_startPtr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
|
|
m_endPtr = m_dataPtr + DMR_SLOT_TYPE_LENGTH_SAMPLES / 2U + DMR_INFO_LENGTH_SAMPLES / 2U - 1U;
|
|
if (m_endPtr >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
m_endPtr -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CDMRDMORX::samplesToBits(uint16_t start, uint8_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold)
|
|
{
|
|
for (uint8_t i = 0U; i < count; i++) {
|
|
q15_t sample = m_buffer[start] - centre;
|
|
|
|
if (sample < -threshold) {
|
|
WRITE_BIT1(buffer, offset, false);
|
|
offset++;
|
|
WRITE_BIT1(buffer, offset, true);
|
|
offset++;
|
|
} else if (sample < 0) {
|
|
WRITE_BIT1(buffer, offset, false);
|
|
offset++;
|
|
WRITE_BIT1(buffer, offset, false);
|
|
offset++;
|
|
} else if (sample < threshold) {
|
|
WRITE_BIT1(buffer, offset, true);
|
|
offset++;
|
|
WRITE_BIT1(buffer, offset, false);
|
|
offset++;
|
|
} else {
|
|
WRITE_BIT1(buffer, offset, true);
|
|
offset++;
|
|
WRITE_BIT1(buffer, offset, true);
|
|
offset++;
|
|
}
|
|
|
|
start += DMR_RADIO_SYMBOL_LENGTH;
|
|
if (start >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
start -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
}
|
|
}
|
|
|
|
void CDMRDMORX::setColorCode(uint8_t colorCode)
|
|
{
|
|
m_colorCode = colorCode;
|
|
}
|
|
|
|
void CDMRDMORX::writeRSSIData(uint8_t* frame)
|
|
{
|
|
#if defined(SEND_RSSI_DATA)
|
|
// Calculate RSSI average over a burst period. We don't take into account 2.5 ms at the beginning and 2.5 ms at the end
|
|
uint16_t start = m_startPtr + DMR_SYNC_LENGTH_SAMPLES / 2U;
|
|
|
|
uint32_t accum = 0U;
|
|
for (uint16_t i = 0U; i < (DMR_FRAME_LENGTH_SAMPLES - DMR_SYNC_LENGTH_SAMPLES); i++) {
|
|
accum += m_rssi[start];
|
|
|
|
start++;
|
|
if (start >= DMO_BUFFER_LENGTH_SAMPLES)
|
|
start -= DMO_BUFFER_LENGTH_SAMPLES;
|
|
}
|
|
|
|
uint16_t avg = accum / (DMR_FRAME_LENGTH_SAMPLES - DMR_SYNC_LENGTH_SAMPLES);
|
|
frame[34U] = (avg >> 8) & 0xFFU;
|
|
frame[35U] = (avg >> 0) & 0xFFU;
|
|
|
|
serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 3U);
|
|
#else
|
|
serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
|
|
#endif
|
|
}
|