Crash_Override/MMDVMHost-Private
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Update M17 to the latest secification, removal of the CRC from the

Browse source 
stream data.
This commit is contained in:
Jonathan Naylor 2021-04-11 17:31:05 +01:00
parent e6d5ef9055
commit 3a73a25c1e
4 changed files with 9 additions and 28 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
M17Control.cpp
View file

@ -75,7 +75,6 @@ m_networkWatchdog(1000U, 0U, 1500U),
m_elapsed(),
m_rfFrames(0U),
m_netFrames(0U),
m_rfFN(0U),
m_rfErrs(0U),
m_rfBits(1U),
m_rfLSF(),
@ -194,7 +193,6 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
m_aveRSSI = m_rssi;
m_rssiCount = 1U;
m_rfLSFn = 0U;
m_rfFN = 0U;
#if defined(DUMP_M17)
openFile();
@ -258,22 +256,10 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
writeFile(data + 2U);
#endif
CM17Convolution conv;
unsigned char frame[M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES];
unsigned char frame[M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES];
conv.decodeData(data + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES, frame);
bool valid = CM17CRC::checkCRC16(frame, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES);
if (valid) {
m_rfFN = (frame[0U] << 8) + (frame[1U] << 0);
} else {
m_rfFN++;
// The new FN
frame[0U] = m_rfFN >> 8;
frame[1U] = m_rfFN >> 0;
// Recalculate the CRC
CM17CRC::encodeCRC16(frame, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES);
}
unsigned int fn = ((frame[0U] << 8) + (frame[1U] << 0)) & 0x7FU;
unsigned char rfData[2U + M17_FRAME_LENGTH_BYTES];
@ -310,7 +296,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
errors += CUtils::countBits(rfData[offset] ^ data[offset]);
}
LogDebug("M17, FN: %u, errs: %u/144 (%.1f%%)", m_rfFN & 0x7FU, errors, float(errors) / 1.44F);
LogDebug("M17, FN: %u, errs: %u/144 (%.1f%%)", fn & 0x7FU, errors, float(errors) / 1.44F);
m_rfBits += M17_FN_LENGTH_BITS + M17_PAYLOAD_LENGTH_BITS;
m_rfErrs += errors;
@ -345,7 +331,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
m_rfLSFn = 0U;
// Only check for the EOT marker if the frame has a valid CRC
if (valid && (m_rfFN & 0x8000U) == 0x8000U) {
if ((fn & 0x8000U) == 0x8000U) {
std::string source = m_rfLSF.getSource();
std::string dest = m_rfLSF.getDest();
@ -520,12 +506,9 @@ void CM17Control::writeNetwork()
CM17Utils::combineFragmentLICHFEC(lich1, lich2, lich3, lich4, data + 2U + M17_SYNC_LENGTH_BYTES);
// Add the FN and the data/audio
unsigned char payload[M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES];
unsigned char payload[M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES];
::memcpy(payload, netData + 28U, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES);
// Add the CRC
CM17CRC::encodeCRC16(payload, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES);
// Add the Convolution FEC
CM17Convolution conv;
conv.encodeData(payload, data + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES);

1
M17Control.h
View file

@ -65,7 +65,6 @@ private:
CStopWatch m_elapsed;
unsigned int m_rfFrames;
unsigned int m_netFrames;
unsigned int m_rfFN;
unsigned int m_rfErrs;
unsigned int m_rfBits;
CM17LSF m_rfLSF;

7
M17Convolution.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2020 by Jonathan Naylor G4KLX
* Copyright (C) 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
@ -32,9 +32,8 @@ const unsigned int PUNCTURE_LIST_LINK_SETUP[] = {
449U, 452U, 455U, 462U, 465U, 468U, 471U, 478U, 481U, 484U};
const unsigned int PUNCTURE_LIST_DATA[] = {
5U, 11U, 17U, 20U, 23U, 29U, 35U, 46U, 52U, 58U, 61U, 64U, 70U, 76U, 87U, 93U, 99U, 102U, 105U, 111U, 117U, 128U, 134U, 140U,
143U, 146U, 152U, 158U, 169U, 175U, 181U, 184U, 187U, 193U, 199U, 210U, 216U, 222U, 225U, 228U, 234U, 240U, 251U, 257U, 263U,
266U, 269U, 275U, 281U, 292U, 298U, 304U, 307U, 310U, 316U, 322U};
11U, 23U, 35U, 47U, 59U, 71U, 83U, 95U, 107U, 119U, 131U, 143U, 155U, 167U, 179U, 191U, 203U, 215U, 227U, 239U, 251U, 263U,
275U, 287U, 299U, 311U, 323U };
const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};

2
Version.h
View file

@ -19,6 +19,6 @@
#if !defined(VERSION_H)
#define VERSION_H
const char* VERSION = "20210408";
const char* VERSION = "20210411";
#endif