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MMDVM
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Remove the last traces of M17 packet mode and fix a buffer overrun bug.

This commit is contained in:
Jonathan Naylor 2021-08-08 18:55:09 +01:00
parent 96c0e5b141
commit 2aabdb61ab
6 changed files with 12 additions and 98 deletions
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15
M17Defines.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2016,2017,2018,2020 by Jonathan Naylor G4KLX
* Copyright (C) 2016,2017,2018,2020,2021 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
@ -27,18 +27,15 @@ const unsigned int M17_FRAME_LENGTH_SYMBOLS = M17_FRAME_LENGTH_BITS / 2U;
const unsigned int M17_FRAME_LENGTH_SAMPLES = M17_FRAME_LENGTH_SYMBOLS * M17_RADIO_SYMBOL_LENGTH;
const unsigned int M17_SYNC_LENGTH_BITS = 16U;
const unsigned int M17_SYNC_LENGTH_BYTES = M17_SYNC_LENGTH_BITS / 8U;
const unsigned int M17_SYNC_LENGTH_SYMBOLS = M17_SYNC_LENGTH_BITS / 2U;
const unsigned int M17_SYNC_LENGTH_SAMPLES = M17_SYNC_LENGTH_SYMBOLS * M17_RADIO_SYMBOL_LENGTH;
const uint8_t M17_LINK_SETUP_SYNC_BYTES[] = {0x55U, 0xF7U};
const uint8_t M17_STREAM_SYNC_BYTES[] = {0xFFU, 0x5DU};
const uint8_t M17_PACKET_SYNC_BYTES[] = {0x75U, 0xFFU};
const uint8_t M17_SYNC_BYTES_LENGTH = 2U;
const uint16_t M17_LINK_SETUP_SYNC_BITS = 0x55F7U;
const uint16_t M17_STREAM_SYNC_BITS = 0xFF5DU;
const uint16_t M17_PACKET_SYNC_BITS = 0x75FFU;
// 5 5 F 7
// 01 01 01 01 11 11 01 11
@ -56,13 +53,5 @@ const int8_t M17_STREAM_SYNC_SYMBOLS_VALUES[] = {-3, -3, -3, -3, +3, +3, -3, +3}
const uint8_t M17_STREAM_SYNC_SYMBOLS = 0x0DU;
// 7 5 F F
// 01 11 01 01 11 11 11 11
// +3 -3 +3 +3 -3 -3 -3 -3
const int8_t M17_PACKET_SYNC_SYMBOLS_VALUES[] = {+3, -3, +3, +3, -3, -3, -3, -3};
const uint8_t M17_PACKET_SYNC_SYMBOLS = 0xB0U;
#endif

51
M17RX.cpp
View File

@ -105,7 +105,6 @@ void CM17RX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
switch (m_state) {
case M17RXS_LINK_SETUP:
case M17RXS_STREAM:
case M17RXS_PACKET:
processData(sample);
break;
default:
@ -127,9 +126,8 @@ void CM17RX::processNone(q15_t sample)
{
bool ret1 = correlateSync(M17_LINK_SETUP_SYNC_SYMBOLS, M17_LINK_SETUP_SYNC_SYMBOLS_VALUES, M17_LINK_SETUP_SYNC_BYTES, MAX_SYNC_SYMBOL_START_ERRS, MAX_SYNC_BIT_START_ERRS);
bool ret2 = correlateSync(M17_STREAM_SYNC_SYMBOLS, M17_STREAM_SYNC_SYMBOLS_VALUES, M17_STREAM_SYNC_BYTES, MAX_SYNC_SYMBOL_START_ERRS, MAX_SYNC_BIT_START_ERRS);
// bool ret3 = correlateSync(M17_PACKET_SYNC_SYMBOLS, M17_PACKET_SYNC_SYMBOLS_VALUES, M17_PACKET_SYNC_BYTES, MAX_SYNC_SYMBOL_START_ERRS, MAX_SYNC_BIT_START_ERRS);
if (ret1 || ret2 /* || ret3 */ ) {
if (ret1 || ret2) {
// On the first sync, start the countdown to the state change
if (m_countdown == 0U) {
m_rssiAccum = 0U;
@ -144,7 +142,6 @@ void CM17RX::processNone(q15_t sample)
if (ret1) m_nextState = M17RXS_LINK_SETUP;
if (ret2) m_nextState = M17RXS_STREAM;
// if (ret3) m_nextState = M17RXS_PACKET;
}
}
@ -172,21 +169,17 @@ void CM17RX::processData(q15_t sample)
if (m_dataPtr >= m_minSyncPtr && m_dataPtr <= m_maxSyncPtr) {
bool ret1 = correlateSync(M17_LINK_SETUP_SYNC_SYMBOLS, M17_LINK_SETUP_SYNC_SYMBOLS_VALUES, M17_LINK_SETUP_SYNC_BYTES, MAX_SYNC_SYMBOL_RUN_ERRS, MAX_SYNC_BIT_RUN_ERRS);
bool ret2 = correlateSync(M17_STREAM_SYNC_SYMBOLS, M17_STREAM_SYNC_SYMBOLS_VALUES, M17_STREAM_SYNC_BYTES, MAX_SYNC_SYMBOL_RUN_ERRS, MAX_SYNC_BIT_RUN_ERRS);
// bool ret3 = correlateSync(M17_PACKET_SYNC_SYMBOLS, M17_PACKET_SYNC_SYMBOLS_VALUES, M17_PACKET_SYNC_BYTES, MAX_SYNC_SYMBOL_RUN_ERRS, MAX_SYNC_BIT_RUN_ERRS);
if (ret1) m_state = M17RXS_LINK_SETUP;
if (ret2) m_state = M17RXS_STREAM;
// if (ret3) m_state = M17RXS_PACKET;
}
} else {
if (m_dataPtr >= m_minSyncPtr || m_dataPtr <= m_maxSyncPtr) {
bool ret1 = correlateSync(M17_LINK_SETUP_SYNC_SYMBOLS, M17_LINK_SETUP_SYNC_SYMBOLS_VALUES, M17_LINK_SETUP_SYNC_BYTES, MAX_SYNC_SYMBOL_RUN_ERRS, MAX_SYNC_BIT_RUN_ERRS);
bool ret2 = correlateSync(M17_STREAM_SYNC_SYMBOLS, M17_STREAM_SYNC_SYMBOLS_VALUES, M17_STREAM_SYNC_BYTES, MAX_SYNC_SYMBOL_RUN_ERRS, MAX_SYNC_BIT_RUN_ERRS);
// bool ret3 = correlateSync(M17_PACKET_SYNC_SYMBOLS, M17_PACKET_SYNC_SYMBOLS_VALUES, M17_PACKET_SYNC_BYTES, MAX_SYNC_SYMBOL_RUN_ERRS, MAX_SYNC_BIT_RUN_ERRS);
if (ret1) m_state = M17RXS_LINK_SETUP;
if (ret2) m_state = M17RXS_STREAM;
// if (ret3) m_state = M17RXS_PACKET;
}
}
@ -211,9 +204,6 @@ void CM17RX::processData(q15_t sample)
case M17RXS_STREAM:
DEBUG4("M17RX: stream sync found pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
break;
case M17RXS_PACKET:
DEBUG4("M17RX: packet sync found pos/centre/threshold", m_syncPtr, m_centreVal, m_thresholdVal);
break;
default:
break;
}
@ -238,8 +228,7 @@ void CM17RX::processData(q15_t sample)
m_nextState = M17RXS_NONE;
m_maxCorr = 0;
} else {
frame[0U] = 0x00U;
frame[0U] |= m_lostCount == (MAX_SYNC_FRAMES - 1U) ? 0x01U : 0x00U;
frame[0U] = m_lostCount == (MAX_SYNC_FRAMES - 1U) ? 0x01U : 0x00U;
switch (m_state) {
case M17RXS_LINK_SETUP:
@ -248,9 +237,6 @@ void CM17RX::processData(q15_t sample)
case M17RXS_STREAM:
writeRSSIStream(frame);
break;
case M17RXS_PACKET:
writeRSSIPacket(frame);
break;
default:
break;
}
@ -312,11 +298,11 @@ bool CM17RX::correlateSync(uint8_t syncSymbols, const int8_t* syncSymbolValues,
if (startPtr >= M17_FRAME_LENGTH_SAMPLES)
startPtr -= M17_FRAME_LENGTH_SAMPLES;
uint8_t sync[M17_SYNC_BYTES_LENGTH];
uint8_t sync[M17_SYNC_LENGTH_BYTES];
samplesToBits(startPtr, M17_SYNC_LENGTH_SYMBOLS, sync, 0U, m_centreVal, m_thresholdVal);
uint8_t errs = 0U;
for (uint8_t i = 0U; i < M17_SYNC_BYTES_LENGTH; i++)
for (uint8_t i = 0U; i < M17_SYNC_LENGTH_BYTES; i++)
errs += countBits8(sync[i] ^ syncBytes[i]);
if (errs <= maxBitErrs) {
@ -441,8 +427,8 @@ void CM17RX::writeRSSILinkSetup(uint8_t* data)
if (m_rssiCount > 0U) {
uint16_t rssi = m_rssiAccum / m_rssiCount;
data[121U] = (rssi >> 8) & 0xFFU;
data[122U] = (rssi >> 0) & 0xFFU;
data[49U] = (rssi >> 8) & 0xFFU;
data[50U] = (rssi >> 0) & 0xFFU;
serial.writeM17LinkSetup(data, M17_FRAME_LENGTH_BYTES + 3U);
} else {
@ -462,8 +448,8 @@ void CM17RX::writeRSSIStream(uint8_t* data)
if (m_rssiCount > 0U) {
uint16_t rssi = m_rssiAccum / m_rssiCount;
data[121U] = (rssi >> 8) & 0xFFU;
data[122U] = (rssi >> 0) & 0xFFU;
data[49U] = (rssi >> 8) & 0xFFU;
data[50U] = (rssi >> 0) & 0xFFU;
serial.writeM17Stream(data, M17_FRAME_LENGTH_BYTES + 3U);
} else {
@ -477,26 +463,5 @@ void CM17RX::writeRSSIStream(uint8_t* data)
m_rssiCount = 0U;
}
void CM17RX::writeRSSIPacket(uint8_t* data)
{
#if defined(SEND_RSSI_DATA)
if (m_rssiCount > 0U) {
uint16_t rssi = m_rssiAccum / m_rssiCount;
data[121U] = (rssi >> 8) & 0xFFU;
data[122U] = (rssi >> 0) & 0xFFU;
serial.writeM17Packet(data, M17_FRAME_LENGTH_BYTES + 3U);
} else {
serial.writeM17Packet(data, M17_FRAME_LENGTH_BYTES + 1U);
}
#else
serial.writeM17Packet(data, M17_FRAME_LENGTH_BYTES + 1U);
#endif
m_rssiAccum = 0U;
m_rssiCount = 0U;
}
#endif

4
M17RX.h
View File

@ -28,8 +28,7 @@
enum M17RX_STATE {
M17RXS_NONE,
M17RXS_LINK_SETUP,
M17RXS_STREAM,
M17RXS_PACKET
M17RXS_STREAM
};
class CM17RX {
@ -70,7 +69,6 @@ private:
void samplesToBits(uint16_t start, uint16_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold);
void writeRSSILinkSetup(uint8_t* data);
void writeRSSIStream(uint8_t* data);
void writeRSSIPacket(uint8_t* data);
};
#endif

37
SerialPort.cpp
View File

@ -1329,20 +1329,6 @@ void CSerialPort::processMessage(uint8_t type, const uint8_t* buffer, uint16_t l
sendNAK(type, err);
}
break;
case MMDVM_M17_PACKET:
if (m_m17Enable) {
if (m_modemState == STATE_IDLE || m_modemState == STATE_M17)
err = m17TX.writeData(buffer, length);
}
if (err == 0U) {
if (m_modemState == STATE_IDLE)
setMode(STATE_M17);
} else {
DEBUG2("Received invalid M17 packet data", err);
sendNAK(type, err);
}
break;
#endif
#if defined(MODE_POCSAG)
@ -1740,29 +1726,6 @@ void CSerialPort::writeM17Stream(const uint8_t* data, uint8_t length)
writeInt(1U, reply, count);
}
void CSerialPort::writeM17Packet(const uint8_t* data, uint8_t length)
{
if (m_modemState != STATE_M17 && m_modemState != STATE_IDLE)
return;
if (!m_m17Enable)
return;
uint8_t reply[130U];
reply[0U] = MMDVM_FRAME_START;
reply[1U] = 0U;
reply[2U] = MMDVM_M17_PACKET;
uint8_t count = 3U;
for (uint8_t i = 0U; i < length; i++, count++)
reply[count] = data[i];
reply[1U] = count;
writeInt(1U, reply, count);
}
void CSerialPort::writeM17Lost()
{
if (m_modemState != STATE_M17 && m_modemState != STATE_IDLE)

1
SerialPort.h
View File

@ -67,7 +67,6 @@ public:
#if defined(MODE_M17)
void writeM17LinkSetup(const uint8_t* data, uint8_t length);
void writeM17Stream(const uint8_t* data, uint8_t length);
void writeM17Packet(const uint8_t* data, uint8_t length);
void writeM17Lost();
#endif

2
Version.h
View File

@ -19,7 +19,7 @@
#if !defined(VERSION_H)
#define VERSION_H
#define VERSION "20210719"
#define VERSION "20210808"
#endif