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Yet another POCSAG bugfix (multi-batch messages are not cut anymore)

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Added BCH ECC functions for checking, error correction and encoding
This commit is contained in:
furrtek 2017-02-06 20:32:33 +00:00
parent 98f89a84bb
commit 24abe4b427
9 changed files with 627 additions and 64 deletions
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19
firmware/baseband/proc_pocsag.cpp
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@ -47,7 +47,7 @@ void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
const int32_t audio_sample = __SSAT(sample_int, 16);
slicer_sr <<= 1;
slicer_sr |= (audio_sample < 0);
slicer_sr |= (audio_sample < 0); // Do we need hysteresis ?
// Detect transitions to adjust clock
if ((slicer_sr ^ (slicer_sr >> 1)) & 1) {
@ -79,19 +79,18 @@ void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
if (sync_timeout < POCSAG_TIMEOUT) {
sync_timeout++;
if (rx_data == POCSAG_SYNC) {
if (rx_data == POCSAG_SYNCWORD) {
packet.clear();
codeword_count = 0;
rx_bit = 0;
msg_timeout = 0;
rx_state = SYNC;
} /*else if (rx_data == POCSAG_IDLE) {
rx_state = WAITING;
}*/
}
} else {
rx_state = WAITING; // Timed out: abort
push_packet(pocsag::PacketFlag::TOO_LONG); // DEBUG
// Timeout here is normal (end of message)
rx_state = WAITING;
//push_packet(pocsag::PacketFlag::TIMED_OUT);
}
break;
@ -113,12 +112,12 @@ void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
codeword_count++;
} else {
push_packet(pocsag::PacketFlag::NORMAL);
rx_state = WAITING;
rx_state = PREAMBLE;
sync_timeout = 0;
}
}
} else {
// Timed out (no end of message received)
packet.set(0, codeword_count); // DEBUG
packet.set(0, codeword_count); // Replace first codeword with count, for debug
push_packet(pocsag::PacketFlag::TIMED_OUT);
rx_state = WAITING;
}