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furrtek
2016-01-31 09:34:24 +01:00
parent 29ec87a9ad
commit 44638e504b
166 changed files with 8700 additions and 3967 deletions
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firmware/baseband/proc_tpms.cpp
+35 -25
View File
@@ -23,36 +23,49 @@
#include "portapack_shared_memory.hpp"
#include "i2s.hpp"
using namespace lpc43xx;
#include "dsp_fir_taps.hpp"
void TPMSProcessor::execute(buffer_c8_t buffer) {
// IFIR image-reject filter: fs=2457600, pass=100000, stop=407200, decim=4, fout=614400
static constexpr fir_taps_real<24> taps_200k_decim_0 = {
.pass_frequency_normalized = 100000.0f / 2457600.0f,
.stop_frequency_normalized = 407200.0f / 2457600.0f,
.taps = { {
90, 94, 4, -240, -570, -776, -563, 309,
1861, 3808, 5618, 6710, 6710, 5618, 3808, 1861,
309, -563, -776, -570, -240, 4, 94, 90,
} },
};
// IFIR prototype filter: fs=614400, pass=100000, stop=207200, decim=2, fout=307200
static constexpr fir_taps_real<16> taps_200k_decim_1 = {
.pass_frequency_normalized = 100000.0f / 614400.0f,
.stop_frequency_normalized = 207200.0f / 614400.0f,
.taps = { {
-132, -256, 545, 834, -1507, -2401, 4666, 14583,
14583, 4666, -2401, -1507, 834, 545, -256, -132,
} },
};
TPMSProcessor::TPMSProcessor() {
decim_0.configure(taps_200k_decim_0.taps, 33554432);
decim_1.configure(taps_200k_decim_1.taps, 131072);
}
void TPMSProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
auto decimator_out = decimator.execute(buffer);
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto decimator_out = decim_1_out;
/* 76.8kHz, 64 samples */
/* 307.2kHz, 256 samples */
feed_channel_stats(decimator_out);
/* No spectrum display while FSK decoding.
feed_channel_spectrum(
channel,
decimator_out.sampling_rate * channel_filter_taps.pass_frequency_normalized,
decimator_out.sampling_rate * channel_filter_taps.stop_frequency_normalized
);
*/
for(size_t i=0; i<decimator_out.count; i++) {
// TODO: No idea why implicit cast int16_t->float is not allowed.
const std::complex<float> sample {
static_cast<float>(decimator_out.p[i].real()),
static_cast<float>(decimator_out.p[i].imag())
};
if( mf.execute_once(sample) ) {
if( mf.execute_once(decimator_out.p[i]) ) {
clock_recovery(mf.get_output());
}
}
i2s::i2s0::tx_mute();
}
void TPMSProcessor::consume_symbol(
@@ -63,11 +76,8 @@ void TPMSProcessor::consume_symbol(
}
void TPMSProcessor::payload_handler(
const std::bitset<1024>& payload,
const size_t bits_received
const baseband::Packet& packet
) {
TPMSPacketMessage message;
message.packet.payload = payload;
message.packet.bits_received = bits_received;
const TPMSPacketMessage message { packet };
shared_memory.application_queue.push(message);
}