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Pocsag improvements (#20)

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* Update analog_audio_app.cpp (#353)

* Adding phase field (extracted from @jamesshao8 repo)
This commit is contained in:
Erwin Ried
2020-05-09 13:13:21 +02:00
committed by GitHub
parent 3e15baa251
commit 4aaac8545b
9 changed files with 51 additions and 11 deletions
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8
firmware/baseband/proc_pocsag.cpp
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@@ -47,8 +47,11 @@ 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); // Do we need hysteresis ?
if (phase == 0)
slicer_sr |= (audio_sample < 0); // Do we need hysteresis ?
else
slicer_sr |= !(audio_sample < 0);
// Detect transitions to adjust clock
if ((slicer_sr ^ (slicer_sr >> 1)) & 1) {
if (sphase < (0x8000u - sphase_delta_half))
@@ -162,6 +165,7 @@ void POCSAGProcessor::configure(const POCSAGConfigureMessage& message) {
//audio_output.configure(false);
bitrate = message.bitrate;
phase = message.phase;
sphase_delta = 0x10000u * bitrate / POCSAG_AUDIO_RATE;
sphase_delta_half = sphase_delta / 2; // Just for speed
sphase_delta_eighth = sphase_delta / 8;

1
firmware/baseband/proc_pocsag.hpp
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@@ -95,6 +95,7 @@ private:
bool configured = false;
rx_states rx_state { WAITING };
pocsag::BitRate bitrate { pocsag::BitRate::FSK1200 };
bool phase;
uint32_t codeword_count { 0 };
pocsag::POCSAGPacket packet { };