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MMDVM
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Add sync dumping and improve YSF and P25.

This commit is contained in:
Jonathan Naylor 2017-01-31 20:36:31 +00:00
parent 4bc0f36b49
commit f3a3132a6c
10 changed files with 311 additions and 125 deletions
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27
DMRDMORX.cpp
View File

@ -18,6 +18,8 @@
#define WANT_DEBUG
#define DUMP_SAMPLES
#include "Config.h"
#include "Globals.h"
#include "DMRDMORX.h"
@ -127,6 +129,10 @@ bool CDMRDMORX::processSample(q15_t sample, uint16_t rssi)
ptr -= DMO_BUFFER_LENGTH_SAMPLES;
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
#if defined(DUMP_SAMPLES)
if (m_control == CONTROL_DATA || m_control == CONTROL_VOICE)
writeSync(ptr);
#endif
if (m_control == CONTROL_DATA) {
// Data sync
@ -425,3 +431,24 @@ void CDMRDMORX::writeRSSIData(uint8_t* frame)
serial.writeDMRData(true, frame, DMR_FRAME_LENGTH_BYTES + 1U);
#endif
}
void CDMRDMORX::writeSync(uint16_t start)
{
// XXX Check this
start += DMR_AUDIO_LENGTH_SYMBOLS / 2U;
if (start >= DMO_BUFFER_LENGTH_SAMPLES)
start -= DMO_BUFFER_LENGTH_SAMPLES;
q15_t sync[DMR_SYNC_LENGTH_SYMBOLS];
for (uint16_t i = 0U; i < DMR_SYNC_LENGTH_SYMBOLS; i++) {
sync[i] = m_buffer[start];
start += DMR_RADIO_SYMBOL_LENGTH;
if (start >= DMO_BUFFER_LENGTH_SAMPLES)
start -= DMO_BUFFER_LENGTH_SAMPLES;
}
serial.writeSamples(STATE_DMR, sync, DMR_SYNC_LENGTH_SYMBOLS);
}

1
DMRDMORX.h
View File

@ -64,6 +64,7 @@ private:
void correlateSync(bool first);
void samplesToBits(uint16_t start, uint8_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
void writeRSSIData(uint8_t* frame);
void writeSync(uint16_t start);
};
#endif

23
DMRSlotRX.cpp
View File

@ -18,6 +18,8 @@
#define WANT_DEBUG
#define DUMP_SAMPLES
#include "Config.h"
#include "Globals.h"
#include "DMRSlotRX.h"
@ -130,6 +132,10 @@ bool CDMRSlotRX::processSample(q15_t sample, uint16_t rssi)
uint16_t ptr = m_endPtr - DMR_FRAME_LENGTH_SAMPLES + DMR_RADIO_SYMBOL_LENGTH + 1U;
samplesToBits(ptr, DMR_FRAME_LENGTH_SYMBOLS, frame, 8U, centre, threshold);
#if defined(DUMP_SAMPLES)
if (m_control == CONTROL_DATA || m_control == CONTROL_VOICE)
writeSync(ptr);
#endif
if (m_control == CONTROL_DATA) {
// Data sync
@ -387,3 +393,20 @@ void CDMRSlotRX::writeRSSIData(uint8_t* frame)
serial.writeDMRData(m_slot, frame, DMR_FRAME_LENGTH_BYTES + 1U);
#endif
}
void CDMRSlotRX::writeSync(uint16_t start)
{
// XXX Check this
start += DMR_AUDIO_LENGTH_SYMBOLS / 2U;
q15_t sync[DMR_SYNC_LENGTH_SYMBOLS];
for (uint16_t i = 0U; i < DMR_SYNC_LENGTH_SYMBOLS; i++) {
sync[i] = m_buffer[start];
start += DMR_RADIO_SYMBOL_LENGTH;
}
serial.writeSamples(STATE_DMR, sync, DMR_SYNC_LENGTH_SYMBOLS);
}

1
DMRSlotRX.h
View File

@ -67,6 +67,7 @@ private:
void correlateSync(bool first);
void samplesToBits(uint16_t start, uint8_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
void writeRSSIData(uint8_t* frame);
void writeSync(uint16_t start);
};
#endif

183
P25RX.cpp
View File

@ -18,6 +18,8 @@
#define WANT_DEBUG
#define DUMP_SAMPLES
#include "Config.h"
#include "Globals.h"
#include "P25RX.h"
@ -42,14 +44,13 @@ m_bitBuffer(),
m_buffer(),
m_bitPtr(0U),
m_dataPtr(0U),
m_endLduPtr(NOENDPTR),
m_endPtr(NOENDPTR),
m_syncPtr(NOENDPTR),
m_minHdrPtr(NOENDPTR),
m_maxHdrPtr(NOENDPTR),
m_minSyncPtr(NOENDPTR),
m_maxSyncPtr(NOENDPTR),
m_maxCorr(0),
m_lostCount(0U),
m_countdown(0U),
m_centre(),
m_centreVal(0),
m_centreBest(0),
@ -69,15 +70,14 @@ void CP25RX::reset()
m_bitPtr = 0U;
m_maxCorr = 0;
m_averagePtr = 0U;
m_endLduPtr = NOENDPTR;
m_endPtr = NOENDPTR;
m_syncPtr = NOENDPTR;
m_minHdrPtr = NOENDPTR;
m_maxHdrPtr = NOENDPTR;
m_minSyncPtr = NOENDPTR;
m_maxSyncPtr = NOENDPTR;
m_centreVal = 0;
m_thresholdVal = 0;
m_lostCount = 0U;
m_countdown = 0U;
m_rssiAccum = 0U;
m_rssiCount = 0U;
}
@ -96,10 +96,17 @@ void CP25RX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
m_buffer[m_dataPtr] = sample;
if (m_state == P25RXS_NONE)
switch (m_state) {
case P25RXS_HDR:
processHdr(sample);
break;
case P25RXS_LDU:
processLdu(sample);
break;
default:
processNone(sample);
else
processData(sample);
break;
}
m_dataPtr++;
if (m_dataPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
@ -113,33 +120,103 @@ void CP25RX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
void CP25RX::processNone(q15_t sample)
{
bool ret = correlateSync(true);
bool ret = correlateSync();
if (ret) {
// On the first sync, start the countdown to the state change
if (m_countdown == 0U) {
m_rssiAccum = 0U;
m_rssiCount = 0U;
io.setDecode(true);
io.setADCDetection(true);
// If sync is between the two Hdr ptrs then we have a Hdr
// Send data out and update the m_endLduPtr
m_countdown = 5U;
}
}
if (m_dataPtr == m_endLduPtr) {
if (m_countdown > 0U)
m_countdown--;
if (m_countdown == 1U) {
for (uint8_t i = 0U; i < 16U; i++) {
m_centre[i] = m_centreBest;
m_threshold[i] = m_thresholdBest;
}
m_centreVal = m_centreBest;
m_thresholdVal = m_thresholdBest;
m_averagePtr = 0U;
DEBUG4("P25RX: sync found in None pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
// These are the sync positions for the following LDU after a HDR
m_minSyncPtr = m_syncPtr + P25_HDR_FRAME_LENGTH_SAMPLES - 1U;
if (m_minSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_minSyncPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
uint16_t ptr = m_endLduPtr + P25_RADIO_SYMBOL_LENGTH + 1U;
m_maxSyncPtr = m_syncPtr + P25_HDR_FRAME_LENGTH_SAMPLES + 1U;
if (m_maxSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_maxSyncPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
m_state = P25RXS_HDR;
m_countdown = 0U;
}
}
void CP25RX::processHdr(q15_t sample)
{
if (m_minSyncPtr < m_maxSyncPtr) {
if (m_dataPtr >= m_minSyncPtr && m_dataPtr <= m_maxSyncPtr)
correlateSync();
} else {
if (m_dataPtr >= m_minSyncPtr || m_dataPtr <= m_maxSyncPtr)
correlateSync();
}
if (m_dataPtr == m_maxSyncPtr) {
bool isSync = false;
if (m_minSyncPtr < m_maxSyncPtr) {
if (m_syncPtr >= m_minSyncPtr && m_syncPtr <= m_maxSyncPtr)
isSync = true;
} else {
if (m_syncPtr >= m_minSyncPtr || m_syncPtr <= m_maxSyncPtr)
isSync = true;
}
DEBUG4("P25RX, sync position in HDR, pos/min/max", m_syncPtr, m_minSyncPtr, m_maxSyncPtr);
if (isSync) {
// XXX this is possibly wrong
uint16_t ptr = m_syncPtr + P25_LDU_FRAME_LENGTH_SAMPLES - P25_HDR_FRAME_LENGTH_SAMPLES - P25_SYNC_LENGTH_SAMPLES + 1U;
if (ptr >= P25_LDU_FRAME_LENGTH_SAMPLES)
ptr -= P25_LDU_FRAME_LENGTH_SAMPLES;
m_threshold[m_averagePtr] = m_thresholdBest;
m_centre[m_averagePtr] = m_centreBest;
m_averagePtr++;
if (m_averagePtr >= 16U)
m_averagePtr = 0U;
// Find the average centre and threshold values
m_centreVal = 0;
m_thresholdVal = 0;
for (uint8_t i = 0U; i < 16U; i++) {
m_centreVal += m_centre[i];
m_thresholdVal += m_threshold[i];
}
m_centreVal >>= 4;
m_thresholdVal >>= 4;
DEBUG4("P25RX: sync found in Hdr (best) pos/centre/threshold", m_syncPtr, m_centreBest, m_thresholdBest);
DEBUG4("P25RX: sync found in Hdr pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
uint8_t frame[P25_HDR_FRAME_LENGTH_BYTES + 1U];
samplesToBits(ptr, P25_HDR_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
#if defined(DUMP_SAMPLES)
writeSync(ptr);
#endif
frame[0U] = 0x01U;
serial.writeP25Hdr(frame, P25_HDR_FRAME_LENGTH_BYTES + 1U);
}
m_minSyncPtr = m_syncPtr + P25_LDU_FRAME_LENGTH_SAMPLES - 1U;
if (m_minSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_minSyncPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
@ -148,32 +225,23 @@ void CP25RX::processNone(q15_t sample)
if (m_maxSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_maxSyncPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
uint8_t frame[P25_LDU_FRAME_LENGTH_BYTES + 3U];
samplesToBits(ptr, P25_LDU_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
frame[0U] = 0x01U;
writeRSSILdu(frame);
// Start the next frame
::memset(frame, 0x00U, P25_LDU_FRAME_LENGTH_BYTES + 3U);
m_state = P25RXS_DATA;
m_state = P25RXS_LDU;
m_maxCorr = 0;
}
}
void CP25RX::processData(q15_t sample)
void CP25RX::processLdu(q15_t sample)
{
if (m_minSyncPtr < m_maxSyncPtr) {
if (m_dataPtr >= m_minSyncPtr && m_dataPtr <= m_maxSyncPtr)
correlateSync(false);
correlateSync();
} else {
if (m_dataPtr >= m_minSyncPtr || m_dataPtr <= m_maxSyncPtr)
correlateSync(false);
correlateSync();
}
if (m_dataPtr == m_endLduPtr) {
uint16_t ptr = m_endLduPtr + P25_RADIO_SYMBOL_LENGTH + 1U;
if (m_dataPtr == m_endPtr) {
uint16_t ptr = m_endPtr + P25_RADIO_SYMBOL_LENGTH + 1U;
if (ptr >= P25_LDU_FRAME_LENGTH_SAMPLES)
ptr -= P25_LDU_FRAME_LENGTH_SAMPLES;
@ -196,8 +264,8 @@ void CP25RX::processData(q15_t sample)
m_centreVal >>= 4;
m_thresholdVal >>= 4;
DEBUG4("P25RX: sync found in Data (best) pos/centre/threshold", m_syncPtr, m_centreBest, m_thresholdBest);
DEBUG4("P25RX: sync found in Data (val) pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
DEBUG4("P25RX: sync found in Ldu (best) pos/centre/threshold", m_syncPtr, m_centreBest, m_thresholdBest);
DEBUG4("P25RX: sync found in Ldu pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
m_minSyncPtr = m_syncPtr + P25_LDU_FRAME_LENGTH_SAMPLES - 1U;
if (m_minSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
@ -210,6 +278,9 @@ void CP25RX::processData(q15_t sample)
uint8_t frame[P25_LDU_FRAME_LENGTH_BYTES + 3U];
samplesToBits(ptr, P25_LDU_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
#if defined(DUMP_SAMPLES)
writeSync(ptr);
#endif
// We've not seen a data sync for too long, signal RXLOST and change to RX_NONE
m_lostCount--;
@ -222,21 +293,19 @@ void CP25RX::processData(q15_t sample)
serial.writeP25Lost();
m_state = P25RXS_NONE;
m_endLduPtr = NOENDPTR;
m_endPtr = NOENDPTR;
m_maxCorr = 0;
} else {
frame[0U] = m_lostCount == (MAX_SYNC_FRAMES - 1U) ? 0x01U : 0x00U;
writeRSSILdu(frame);
// Start the next frame
::memset(frame, 0x00U, P25_LDU_FRAME_LENGTH_BYTES + 3U);
}
m_maxCorr = 0;
}
}
}
bool CP25RX::correlateSync(bool none)
bool CP25RX::correlateSync()
{
if (countBits32((m_bitBuffer[m_bitPtr] & P25_SYNC_SYMBOLS_MASK) ^ P25_SYNC_SYMBOLS) <= MAX_SYNC_SYMBOLS_ERRS) {
uint16_t ptr = m_dataPtr + P25_LDU_FRAME_LENGTH_SAMPLES - P25_SYNC_LENGTH_SAMPLES + P25_RADIO_SYMBOL_LENGTH;
@ -275,7 +344,7 @@ bool CP25RX::correlateSync(bool none)
if (ptr >= P25_LDU_FRAME_LENGTH_SAMPLES)
ptr -= P25_LDU_FRAME_LENGTH_SAMPLES;
if (none)
if (m_state == P25RXS_NONE)
samplesToBits(ptr, P25_SYNC_LENGTH_SYMBOLS, sync, 0U, centre, threshold);
else
samplesToBits(ptr, P25_SYNC_LENGTH_SYMBOLS, sync, 0U, m_centreVal, m_thresholdVal);
@ -291,18 +360,20 @@ bool CP25RX::correlateSync(bool none)
m_lostCount = MAX_SYNC_FRAMES;
m_syncPtr = m_dataPtr;
m_endLduPtr = m_dataPtr + P25_LDU_FRAME_LENGTH_SAMPLES - P25_SYNC_LENGTH_SAMPLES - 1U;
if (m_endLduPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_endLduPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
// This is the position of the end of a normal LDU
m_endPtr = m_dataPtr + P25_LDU_FRAME_LENGTH_SAMPLES - P25_SYNC_LENGTH_SAMPLES - 1U;
if (m_endPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_endPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
if (none) {
m_minHdrPtr = m_dataPtr + P25_HDR_FRAME_LENGTH_SAMPLES - 1U;
if (m_minHdrPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_minHdrPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
// These are the positions of the sync in the following LDU if the HDR is present
if (m_state == P25RXS_NONE) {
m_minSyncPtr = m_dataPtr + P25_HDR_FRAME_LENGTH_SAMPLES - 1U;
if (m_minSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_minSyncPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
m_maxHdrPtr = m_dataPtr + P25_HDR_FRAME_LENGTH_SAMPLES + 1U;
if (m_maxHdrPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_maxHdrPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
m_maxSyncPtr = m_dataPtr + P25_HDR_FRAME_LENGTH_SAMPLES + 1U;
if (m_maxSyncPtr >= P25_LDU_FRAME_LENGTH_SAMPLES)
m_maxSyncPtr -= P25_LDU_FRAME_LENGTH_SAMPLES;
}
return true;
@ -367,3 +438,17 @@ void CP25RX::writeRSSILdu(uint8_t* ldu)
m_rssiCount = 0U;
}
void CP25RX::writeSync(uint16_t start)
{
q15_t sync[P25_SYNC_LENGTH_SYMBOLS];
for (uint16_t i = 0U; i < P25_SYNC_LENGTH_SYMBOLS; i++) {
sync[i] = m_buffer[start];
start += P25_RADIO_SYMBOL_LENGTH;
if (start >= P25_LDU_FRAME_LENGTH_SAMPLES)
start -= P25_LDU_FRAME_LENGTH_SAMPLES;
}
serial.writeSamples(STATE_P25, sync, P25_SYNC_LENGTH_SYMBOLS);
}

14
P25RX.h
View File

@ -24,7 +24,8 @@
enum P25RX_STATE {
P25RXS_NONE,
P25RXS_DATA
P25RXS_HDR,
P25RXS_LDU
};
class CP25RX {
@ -41,14 +42,13 @@ private:
q15_t m_buffer[P25_LDU_FRAME_LENGTH_SAMPLES];
uint16_t m_bitPtr;
uint16_t m_dataPtr;
uint16_t m_endLduPtr;
uint16_t m_minHdrPtr;
uint16_t m_maxHdrPtr;
uint16_t m_endPtr;
uint16_t m_minSyncPtr;
uint16_t m_maxSyncPtr;
uint16_t m_syncPtr;
q31_t m_maxCorr;
uint16_t m_lostCount;
uint8_t m_countdown;
q15_t m_centre[16U];
q15_t m_centreVal;
q15_t m_centreBest;
@ -60,10 +60,12 @@ private:
uint16_t m_rssiCount;
void processNone(q15_t sample);
void processData(q15_t sample);
bool correlateSync(bool none);
void processHdr(q15_t sample);
void processLdu(q15_t sample);
bool correlateSync();
void samplesToBits(uint16_t start, uint16_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
void writeRSSILdu(uint8_t* ldu);
void writeSync(uint16_t start);
};
#endif

27
SerialPort.cpp
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2013,2015,2016 by Jonathan Naylor G4KLX
* Copyright (C) 2013,2015,2016,2017 by Jonathan Naylor G4KLX
* Copyright (C) 2016 by Colin Durbridge G4EML
*
* This program is free software; you can redistribute it and/or modify
@ -62,6 +62,8 @@ const uint8_t MMDVM_NAK = 0x7FU;
const uint8_t MMDVM_SERIAL = 0x80U;
const uint8_t MMDVM_SAMPLES = 0xF0U;
const uint8_t MMDVM_DEBUG1 = 0xF1U;
const uint8_t MMDVM_DEBUG2 = 0xF2U;
const uint8_t MMDVM_DEBUG3 = 0xF3U;
@ -923,6 +925,29 @@ void CSerialPort::writeRSSIData(const uint8_t* data, uint8_t length)
writeInt(1U, reply, count);
}
void CSerialPort::writeSamples(unsigned char mode, const q15_t* samples, unsigned char nSamples)
{
uint8_t reply[130U];
reply[0U] = MMDVM_FRAME_START;
reply[1U] = 0U;
reply[2U] = MMDVM_SAMPLES;
reply[3U] = mode;
uint8_t count = 4U;
for (uint8_t i = 0U; i < nSamples; i++) {
uint16_t val = uint16_t(samples[i] + 2048);
reply[count++] = (val >> 8) & 0xFF;
reply[count++] = (val >> 0) & 0xFF;
}
reply[1U] = count;
writeInt(1U, reply, count, true);
}
void CSerialPort::writeDebug(const char* text)
{
uint8_t reply[130U];

4
SerialPort.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
* Copyright (C) 2015,2016,2017 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
@ -49,6 +49,8 @@ public:
void writeCalData(const uint8_t* data, uint8_t length);
void writeRSSIData(const uint8_t* data, uint8_t length);
void writeSamples(unsigned char mode, const q15_t* samples, unsigned char nSamples);
void writeDebug(const char* text);
void writeDebug(const char* text, int16_t n1);
void writeDebug(const char* text, int16_t n1, int16_t n2);

80
YSFRX.cpp
View File

@ -18,6 +18,8 @@
#define WANT_DEBUG
#define DUMP_SAMPLES
#include "Config.h"
#include "Globals.h"
#include "YSFRX.h"
@ -48,6 +50,7 @@ m_minSyncPtr(NOENDPTR),
m_maxSyncPtr(NOENDPTR),
m_maxCorr(0),
m_lostCount(0U),
m_countdown(0U),
m_centre(),
m_centreVal(0),
m_centreBest(0),
@ -74,6 +77,7 @@ void CYSFRX::reset()
m_centreVal = 0;
m_thresholdVal = 0;
m_lostCount = 0U;
m_countdown = 0U;
m_rssiAccum = 0U;
m_rssiCount = 0U;
}
@ -92,10 +96,14 @@ void CYSFRX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
m_buffer[m_dataPtr] = sample;
if (m_state == YSFRXS_NONE)
processNone(sample);
else
switch (m_state) {
case YSFRXS_DATA:
processData(sample);
break;
default:
processNone(sample);
break;
}
m_dataPtr++;
if (m_dataPtr >= YSF_FRAME_LENGTH_SAMPLES)
@ -109,30 +117,33 @@ void CYSFRX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
void CYSFRX::processNone(q15_t sample)
{
bool ret = correlateSync(true);
bool ret = correlateSync();
if (ret) {
// On the first sync, start the countdown to the state change
if (m_countdown == 0U) {
m_rssiAccum = 0U;
m_rssiCount = 0U;
io.setDecode(true);
io.setADCDetection(true);
m_countdown = 5U;
}
}
if (m_dataPtr == m_endPtr) {
if (m_countdown > 0U)
m_countdown--;
if (m_countdown == 1U) {
for (uint8_t i = 0U; i < 16U; i++) {
m_centre[i] = m_centreBest;
m_threshold[i] = m_thresholdBest;
}
m_centreVal = m_centreBest;
m_thresholdVal = m_thresholdBest;
m_averagePtr = 0U;
DEBUG4("YSFRX: sync found in None pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
uint16_t ptr = m_endPtr + YSF_RADIO_SYMBOL_LENGTH + 1U;
if (ptr >= YSF_FRAME_LENGTH_SAMPLES)
ptr -= YSF_FRAME_LENGTH_SAMPLES;
m_minSyncPtr = m_syncPtr + YSF_FRAME_LENGTH_SAMPLES - 1U;
if (m_minSyncPtr >= YSF_FRAME_LENGTH_SAMPLES)
m_minSyncPtr -= YSF_FRAME_LENGTH_SAMPLES;
@ -141,17 +152,8 @@ void CYSFRX::processNone(q15_t sample)
if (m_maxSyncPtr >= YSF_FRAME_LENGTH_SAMPLES)
m_maxSyncPtr -= YSF_FRAME_LENGTH_SAMPLES;
uint8_t frame[YSF_FRAME_LENGTH_BYTES + 3U];
samplesToBits(ptr, YSF_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
frame[0U] = 0x01U;
writeRSSIData(frame);
// Start the next frame
::memset(frame, 0x00U, YSF_FRAME_LENGTH_BYTES + 3U);
m_state = YSFRXS_DATA;
m_maxCorr = 0;
m_countdown = 0U;
}
}
@ -159,10 +161,10 @@ void CYSFRX::processData(q15_t sample)
{
if (m_minSyncPtr < m_maxSyncPtr) {
if (m_dataPtr >= m_minSyncPtr && m_dataPtr <= m_maxSyncPtr)
correlateSync(false);
correlateSync();
} else {
if (m_dataPtr >= m_minSyncPtr || m_dataPtr <= m_maxSyncPtr)
correlateSync(false);
correlateSync();
}
if (m_dataPtr == m_endPtr) {
@ -189,8 +191,8 @@ void CYSFRX::processData(q15_t sample)
m_centreVal >>= 4;
m_thresholdVal >>= 4;
DEBUG4("YSFRX: sync found in Data (best) pos/centre/threshold", m_syncPtr, m_centreBest, m_thresholdBest);
DEBUG4("YSFRX: sync found in Data (val) pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
DEBUG4("YSFRX: sync found (best) pos/centre/threshold", m_syncPtr, m_centreBest, m_thresholdBest);
DEBUG4("YSFRX: sync found pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
m_minSyncPtr = m_syncPtr + YSF_FRAME_LENGTH_SAMPLES - 1U;
if (m_minSyncPtr >= YSF_FRAME_LENGTH_SAMPLES)
@ -203,6 +205,9 @@ void CYSFRX::processData(q15_t sample)
uint8_t frame[YSF_FRAME_LENGTH_BYTES + 3U];
samplesToBits(ptr, YSF_FRAME_LENGTH_SYMBOLS, frame, 8U, m_centreVal, m_thresholdVal);
#if defined(DUMP_SAMPLES)
writeSync(ptr);
#endif
// We've not seen a data sync for too long, signal RXLOST and change to RX_NONE
m_lostCount--;
@ -216,20 +221,19 @@ void CYSFRX::processData(q15_t sample)
m_state = YSFRXS_NONE;
m_endPtr = NOENDPTR;
m_countdown = 0U;
m_maxCorr = 0;
} else {
frame[0U] = m_lostCount == (MAX_SYNC_FRAMES - 1U) ? 0x01U : 0x00U;
writeRSSIData(frame);
// Start the next frame
::memset(frame, 0x00U, YSF_FRAME_LENGTH_BYTES + 3U);
}
m_maxCorr = 0;
}
}
}
bool CYSFRX::correlateSync(bool none)
bool CYSFRX::correlateSync()
{
if (countBits32((m_bitBuffer[m_bitPtr] & YSF_SYNC_SYMBOLS_MASK) ^ YSF_SYNC_SYMBOLS) <= MAX_SYNC_SYMBOLS_ERRS) {
uint16_t ptr = m_dataPtr + YSF_FRAME_LENGTH_SAMPLES - YSF_SYNC_LENGTH_SAMPLES + YSF_RADIO_SYMBOL_LENGTH;
@ -268,7 +272,7 @@ bool CYSFRX::correlateSync(bool none)
if (ptr >= YSF_FRAME_LENGTH_SAMPLES)
ptr -= YSF_FRAME_LENGTH_SAMPLES;
if (none)
if (m_state == YSFRXS_NONE)
samplesToBits(ptr, YSF_SYNC_LENGTH_SYMBOLS, sync, 0U, centre, threshold);
else
samplesToBits(ptr, YSF_SYNC_LENGTH_SYMBOLS, sync, 0U, m_centreVal, m_thresholdVal);
@ -350,3 +354,17 @@ void CYSFRX::writeRSSIData(uint8_t* data)
m_rssiCount = 0U;
}
void CYSFRX::writeSync(uint16_t start)
{
q15_t sync[YSF_SYNC_LENGTH_SYMBOLS];
for (uint16_t i = 0U; i < YSF_SYNC_LENGTH_SYMBOLS; i++) {
sync[i] = m_buffer[start];
start += YSF_RADIO_SYMBOL_LENGTH;
if (start >= YSF_FRAME_LENGTH_SAMPLES)
start -= YSF_FRAME_LENGTH_SAMPLES;
}
serial.writeSamples(STATE_YSF, sync, YSF_SYNC_LENGTH_SYMBOLS);
}

4
YSFRX.h
View File

@ -47,6 +47,7 @@ private:
uint16_t m_syncPtr;
q31_t m_maxCorr;
uint16_t m_lostCount;
uint8_t m_countdown;
q15_t m_centre[16U];
q15_t m_centreVal;
q15_t m_centreBest;
@ -59,9 +60,10 @@ private:
void processNone(q15_t sample);
void processData(q15_t sample);
bool correlateSync(bool none);
bool correlateSync();
void samplesToBits(uint16_t start, uint16_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
void writeRSSIData(uint8_t* data);
void writeSync(uint16_t start);
};
#endif