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Extract FSKProcessor into separate files.

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This commit is contained in:
Jared Boone 2015-08-27 13:31:39 -07:00
parent ffe829cf67
commit c7907e948c
4 changed files with 198 additions and 117 deletions
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118
firmware/baseband/main.cpp
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@ -55,6 +55,7 @@
#include "proc_am_audio.hpp"
#include "proc_nfm_audio.hpp"
#include "proc_wfm_audio.hpp"
#include "proc_fsk.hpp"
#include "clock_recovery.hpp"
#include "access_code_correlator.hpp"
@ -80,123 +81,6 @@
constexpr auto baseband_thread_priority = NORMALPRIO + 20;
constexpr auto rssi_thread_priority = NORMALPRIO + 10;
class FSKProcessor : public BasebandProcessor {
public:
FSKProcessor(
MessageHandlerMap& message_handlers
) : message_handlers(message_handlers)
{
message_handlers.register_handler(Message::ID::FSKConfiguration,
[this](const Message* const p) {
auto m = reinterpret_cast<const FSKConfigurationMessage*>(p);
this->configure(m->configuration);
}
);
}
~FSKProcessor() {
message_handlers.unregister_handler(Message::ID::FSKConfiguration);
}
void configure(const FSKConfiguration new_configuration) {
demod.configure(76800, 2 * new_configuration.symbol_rate);
clock_recovery.configure(new_configuration.symbol_rate, 76800);
access_code_correlator.configure(
new_configuration.access_code,
new_configuration.access_code_length,
new_configuration.access_code_tolerance
);
packet_builder.configure(new_configuration.packet_length);
}
void execute(buffer_c8_t buffer) override {
/* 2.4576MHz, 2048 samples */
auto decimator_out = decimator.execute(buffer);
/* 153.6kHz, 128 samples */
const buffer_c16_t work_baseband_buffer {
(complex16_t*)decimator_out.p,
decimator_out.count
};
/* 153.6kHz complex<int16_t>[128]
* -> FIR filter, <?kHz (?fs) pass, gain 1.0
* -> 76.8kHz int16_t[64] */
auto channel = channel_filter.execute(decimator_out, work_baseband_buffer);
/* 76.8kHz, 64 samples */
feed_channel_stats(channel);
feed_channel_spectrum(
channel,
decimator_out.sampling_rate * channel_filter_taps.pass_frequency_normalized,
decimator_out.sampling_rate * channel_filter_taps.stop_frequency_normalized
);
const auto symbol_handler_fn = [this](const float value) {
const uint_fast8_t symbol = (value >= 0.0f) ? 1 : 0;
const bool access_code_found = this->access_code_correlator.execute(symbol);
this->consume_symbol(symbol, access_code_found);
};
// 76.8k
const buffer_s16_t work_demod_buffer {
(int16_t*)decimator_out.p,
decimator_out.count * sizeof(*decimator_out.p) / sizeof(int16_t)
};
auto demodulated = demod.execute(channel, work_demod_buffer);
i2s::i2s0::tx_mute();
for(size_t i=0; i<demodulated.count; i++) {
clock_recovery.execute(demodulated.p[i], symbol_handler_fn);
}
}
private:
ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 };
const fir_taps_real<64>& channel_filter_taps = taps_64_lp_031_070_tfilter;
dsp::decimate::FIRAndDecimateBy2Complex<64> channel_filter { channel_filter_taps.taps };
dsp::demodulate::FM demod { 76800, 9600 * 2 };
ClockRecovery clock_recovery;
AccessCodeCorrelator access_code_correlator;
PacketBuilder packet_builder;
MessageHandlerMap& message_handlers;
void consume_symbol(
const uint_fast8_t symbol,
const bool access_code_found
) {
const auto payload_handler_fn = [this](
const std::bitset<256>& payload,
const size_t bits_received
) {
this->payload_handler(payload, bits_received);
};
packet_builder.execute(
symbol,
access_code_found,
payload_handler_fn
);
}
void payload_handler(
const std::bitset<256>& payload,
const size_t bits_received
) {
FSKPacketMessage message;
message.packet.payload = payload;
message.packet.bits_received = bits_received;
shared_memory.application_queue.push(message);
}
};
static BasebandProcessor* baseband_processor { nullptr };
static BasebandConfiguration baseband_configuration;