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Handle NBFM configuration message on M4 processor side.

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This commit is contained in:
Jared Boone 2016-01-03 12:49:00 -08:00
parent 7496c2aced
commit 317ec53638
2 changed files with 46 additions and 66 deletions
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95
firmware/baseband/proc_nfm_audio.cpp
View File

@ -24,61 +24,11 @@
#include <cstdint>
#include <cstddef>
NarrowbandFMAudio::NarrowbandFMAudio() {
set_mode(Mode::Deviation2K5Narrow);
}
void NarrowbandFMAudio::set_mode(const Mode mode) {
constexpr size_t baseband_fs = 3072000;
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_decimation_factor = 8;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0_decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_decimation_factor = 8;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1_decimation_factor;
constexpr size_t channel_filter_input_fs = decim_1_output_fs;
constexpr size_t channel_filter_decimation_factor = 1;
constexpr size_t channel_filter_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
constexpr size_t demod_input_fs = channel_filter_output_fs;
switch(mode) {
default:
case Mode::Deviation5K:
decim_0.configure(taps_16k0_decim_0.taps, 33554432);
decim_1.configure(taps_16k0_decim_1.taps, 131072);
channel_filter.configure(taps_16k0_channel.taps, channel_filter_decimation_factor);
demod.configure(demod_input_fs, 5000);
channel_filter_pass_f = taps_16k0_channel.pass_frequency_normalized * channel_filter_input_fs;
channel_filter_stop_f = taps_16k0_channel.stop_frequency_normalized * channel_filter_input_fs;
break;
case Mode::Deviation2K5Wide:
decim_0.configure(taps_11k0_decim_0.taps, 33554432);
decim_1.configure(taps_11k0_decim_1.taps, 131072);
channel_filter.configure(taps_11k0_channel.taps, channel_filter_decimation_factor);
demod.configure(demod_input_fs, 2500);
channel_filter_pass_f = taps_11k0_channel.pass_frequency_normalized * channel_filter_input_fs;
channel_filter_stop_f = taps_11k0_channel.stop_frequency_normalized * channel_filter_input_fs;
break;
case Mode::Deviation2K5Narrow:
decim_0.configure(taps_4k25_decim_0.taps, 33554432);
decim_1.configure(taps_4k25_decim_1.taps, 131072);
channel_filter.configure(taps_4k25_channel.taps, channel_filter_decimation_factor);
demod.configure(demod_input_fs, 2500);
channel_filter_pass_f = taps_4k25_channel.pass_frequency_normalized * channel_filter_input_fs;
channel_filter_stop_f = taps_4k25_channel.stop_frequency_normalized * channel_filter_input_fs;
break;
void NarrowbandFMAudio::execute(const buffer_c8_t& buffer) {
if( !configured ) {
return;
}
channel_spectrum.set_decimation_factor(std::floor((channel_filter_output_fs / 2) / ((channel_filter_pass_f + channel_filter_stop_f) / 2)));
}
void NarrowbandFMAudio::execute(const buffer_c8_t& buffer) {
std::array<complex16_t, 512> dst;
const buffer_c16_t dst_buffer {
dst.data(),
@ -118,7 +68,44 @@ void NarrowbandFMAudio::execute(const buffer_c8_t& buffer) {
}
void NarrowbandFMAudio::on_message(const Message* const message) {
if( message->id == Message::ID::UpdateSpectrum ) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
channel_spectrum.update();
break;
case Message::ID::NBFMConfigure:
configure(*reinterpret_cast<const NBFMConfigureMessage*>(message));
break;
default:
break;
}
}
void NarrowbandFMAudio::configure(const NBFMConfigureMessage& message) {
constexpr size_t baseband_fs = 3072000;
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_decimation_factor = 8;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0_decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_decimation_factor = 8;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1_decimation_factor;
constexpr size_t channel_filter_input_fs = decim_1_output_fs;
constexpr size_t channel_filter_decimation_factor = 1;
constexpr size_t channel_filter_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
constexpr size_t demod_input_fs = channel_filter_output_fs;
decim_0.configure(message.decim_0_filter.taps, 33554432);
decim_1.configure(message.decim_1_filter.taps, 131072);
channel_filter.configure(message.channel_filter.taps, channel_filter_decimation_factor);
demod.configure(demod_input_fs, message.deviation);
channel_filter_pass_f = message.channel_filter.pass_frequency_normalized * channel_filter_input_fs;
channel_filter_stop_f = message.channel_filter.stop_frequency_normalized * channel_filter_input_fs;
channel_spectrum.set_decimation_factor(std::floor((channel_filter_output_fs / 2) / ((channel_filter_pass_f + channel_filter_stop_f) / 2)));
configured = true;
}

17
firmware/baseband/proc_nfm_audio.hpp
View File

@ -24,28 +24,18 @@
#include "baseband_processor.hpp"
#include "channel_decimator.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "dsp_fir_taps.hpp"
#include "dsp_iir.hpp"
#include "dsp_iir_config.hpp"
#include "dsp_squelch.hpp"
#include "message.hpp"
#include "spectrum_collector.hpp"
class NarrowbandFMAudio : public BasebandProcessor {
public:
enum class Mode {
Deviation5K = 0,
Deviation2K5Wide = 1,
Deviation2K5Narrow = 2,
};
NarrowbandFMAudio();
void set_mode(const Mode mode);
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
@ -65,6 +55,9 @@ private:
FMSquelch squelch;
SpectrumCollector channel_spectrum;
bool configured { false };
void configure(const NBFMConfigureMessage& message);
};
#endif/*__PROC_NFM_AUDIO_H__*/