Disable the LICH CRC and clean up the payload checksum handling.
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8efd77132f
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4422444179
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@ -217,8 +217,8 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
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unsigned char lich[M17_LICH_FRAGMENT_LENGTH_BYTES];
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CM17Utils::combineFragmentLICH(lich1, lich2, lich3, lich4, lich);
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if (!CM17CRC::checkCRC4(lich, M17_LICH_FRAGMENT_LENGTH_BYTES))
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return false;
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// if (!CM17CRC::checkCRC4(lich, M17_LICH_FRAGMENT_LENGTH_BYTES))
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// return false;
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m_rfLSFn = (lich4 >> 5) & 0x07U;
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m_rfLSF.setFragment(lich, m_rfLSFn);
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@ -249,7 +249,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
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}
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}
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if ((m_rfState == RS_RF_AUDIO || m_rfState == RS_RF_DATA) && data[0U] == TAG_DATA) {
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if (m_rfState == RS_RF_AUDIO && data[0U] == TAG_DATA) {
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#if defined(DUMP_M17)
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writeFile(data + 2U);
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#endif
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@ -261,28 +261,13 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
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if (valid) {
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m_rfFN = (frame[0U] << 8) + (frame[1U] << 0);
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} else {
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// Create a silence frame
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m_rfFN++;
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// The new FN
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frame[0U] = m_rfFN >> 8;
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frame[1U] = m_rfFN >> 0;
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// Add silent audio
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unsigned char dataType = m_rfLSF.getDataType();
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switch (dataType) {
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case M17_DATA_TYPE_VOICE:
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::memcpy(frame + M17_FN_LENGTH_BYTES + 0U, M17_3200_SILENCE, 8U);
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::memcpy(frame + M17_FN_LENGTH_BYTES + 8U, M17_3200_SILENCE, 8U);
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break;
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case M17_DATA_TYPE_VOICE_DATA:
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::memcpy(frame + M17_FN_LENGTH_BYTES + 0U, M17_1600_SILENCE, 8U);
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break;
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default:
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break;
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}
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// Add the CRC
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// Recalculate the CRC
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CM17CRC::encodeCRC16(frame, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES);
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}
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@ -301,7 +286,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
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lich[5U] = (m_rfLSFn & 0x07U) << 5;
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// Add the CRC
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CM17CRC::encodeCRC4(lich, M17_LICH_FRAGMENT_LENGTH_BYTES);
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// CM17CRC::encodeCRC4(lich, M17_LICH_FRAGMENT_LENGTH_BYTES);
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unsigned int frag1, frag2, frag3, frag4;
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CM17Utils::splitFragmentLICH(lich, frag1, frag2, frag3, frag4);
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@ -318,20 +303,20 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
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conv.encodeData(frame, rfData + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES);
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// Calculate the BER
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if (valid) {
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unsigned int errors = 0U;
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for (unsigned int i = 2U; i < (M17_FRAME_LENGTH_BYTES + 2U); i++)
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errors += countBits(rfData[i] ^ data[i]);
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LogDebug("M17, FN: %u, errs: %u/384 (%.1f%%)", m_rfFN & 0x7FU, errors, float(errors) / 3.84F);
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m_rfBits += M17_FRAME_LENGTH_BITS;
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m_rfErrs += errors;
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float ber = float(m_rfErrs) / float(m_rfBits);
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m_display->writeM17BER(ber);
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unsigned int errors = 0U;
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for (unsigned int i = 0U; i < (M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES); i++) {
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unsigned int offset = i + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES;
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errors += countBits(rfData[offset] ^ data[offset]);
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}
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LogDebug("M17, FN: %u, errs: %u/144 (%.1f%%)", m_rfFN & 0x7FU, errors, float(errors) / 1.44F);
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m_rfBits += M17_FN_LENGTH_BITS + M17_PAYLOAD_LENGTH_BITS;
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m_rfErrs += errors;
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float ber = float(m_rfErrs) / float(m_rfBits);
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m_display->writeM17BER(ber);
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unsigned char temp[M17_FRAME_LENGTH_BYTES];
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interleaver(rfData + 2U, temp);
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decorrelator(temp, rfData + 2U);
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@ -358,8 +343,8 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
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if (m_rfLSFn >= 6U)
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m_rfLSFn = 0U;
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// EOT?
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if ((m_rfFN & 0x8000U) == 0x8000U) {
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// Only check for the EOT marker if the frame has a valid CRC
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if (valid && (m_rfFN & 0x8000U) == 0x8000U) {
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std::string source = m_rfLSF.getSource();
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std::string dest = m_rfLSF.getDest();
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@ -523,7 +508,7 @@ void CM17Control::writeNetwork()
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lich[5U] = (m_netLSFn & 0x07U) << 5;
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// Add the CRC
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CM17CRC::encodeCRC4(lich, M17_LICH_FRAGMENT_LENGTH_BYTES);
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// CM17CRC::encodeCRC4(lich, M17_LICH_FRAGMENT_LENGTH_BYTES);
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unsigned int frag1, frag2, frag3, frag4;
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CM17Utils::splitFragmentLICH(lich, frag1, frag2, frag3, frag4);
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