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Noaa apt decoder (#2648)
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firmware/baseband/proc_noaaapt_rx.cpp
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180
firmware/baseband/proc_noaaapt_rx.cpp
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/*
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* Copyright (C) 2025 Brumi, HTotoo
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "proc_noaaapt_rx.hpp"
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#include "sine_table_int8.hpp"
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#include "portapack_shared_memory.hpp"
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#include "audio_dma.hpp"
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#include "math.h"
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#include "event_m4.hpp"
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#include "fxpt_atan2.hpp"
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#include <cstdint>
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#include <cstddef>
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#define NOAAAPT_PX_SIZE 2080.0
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// updates the per pixel timers
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void NoaaAptRx::update_params() {
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// TODO HTOTOO
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// 2080 px / line with chan a,b + sync + telemetry
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pxRem = (double)12000.0 / NOAAAPT_PX_SIZE / 2.0;
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samples_per_pixel = pxRem;
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pxRem -= samples_per_pixel;
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pxRoll = 0;
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status_message.state = 0;
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shared_memory.application_queue.push(status_message);
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}
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void NoaaAptRx::execute(const buffer_c8_t& buffer) {
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if (!configured) {
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return;
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}
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const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
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const auto channel = decim_1.execute(decim_0_out, dst_buffer);
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// TODO: Feed channel_stats post-decimation data?
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feed_channel_stats(channel);
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/* spectrum_samples += channel.count;
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if (spectrum_samples >= spectrum_interval_samples) {
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spectrum_samples -= spectrum_interval_samples;
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channel_spectrum.feed(channel, channel_filter_low_f, channel_filter_high_f, channel_filter_transition);
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}
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*/
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/* 96kHz complex<int16_t>[64] for wfmam NOAA
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* -> FM demodulation
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* -> 96kHz int16_t[64] */
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auto audio_oversampled = demod.execute(channel, work_audio_buffer); // fs 384khz wfm , 96khz wfmam for NOAA
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/* 96kHz int16_t[64] for wfam
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* -> 4th order CIC decimation by 2, gain of 1
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* -> 48kHz int16_t[32] */
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auto audio_4fs = audio_dec_1.execute(audio_oversampled, work_audio_buffer);
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/* 48kHz int16_t[32] for wfman
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* -> 4th order CIC decimation by 2, gain of 1
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* -> 24kHz int16_t[16] */
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auto audio_2fs = audio_dec_2.execute(audio_4fs, work_audio_buffer);
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/* 24kHz int16_t[16] for wfmam
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* -> FIR filter, <4.5kHz (0.1875fs) pass, >5.2kHz (0.2166fs) stop, gain of 1
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* -> 12kHz int16_t[8] */
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auto audio = audio_filter.execute(audio_2fs, work_audio_buffer);
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/* -> 12kHz int16_t[8] for wfmam , */
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std::array<float, 32> audio_f;
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audio_output.apt_write(audio, audio_f); // we are in added wfmam (noaa), decim_1.decimation_factor == 8
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for (size_t c = 0; c < audio.count; c++) {
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if (status_message.state == 0 && false) { // disabled this due to NIY
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// first look for the sync!
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} else {
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cnt++;
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if (cnt >= (samples_per_pixel + (uint32_t)pxRoll)) { // got a pixel
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cnt = 0;
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if (pxRoll >= 1) pxRoll -= 1.0;
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pxRoll += pxRem;
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if (image_message.cnt < 400) {
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if (audio_f[c] >= 1) {
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image_message.image[image_message.cnt++] = 255;
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} else if (audio_f[c] <= 0) {
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image_message.image[image_message.cnt++] = 0;
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} else {
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image_message.image[image_message.cnt++] = (audio_f[c]) * 255;
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}
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}
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if (image_message.cnt >= 399) {
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shared_memory.application_queue.push(image_message);
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image_message.cnt = 0;
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if (status_message.state != 2) {
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status_message.state = 2;
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shared_memory.application_queue.push(status_message);
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}
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}
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}
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}
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}
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}
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void NoaaAptRx::on_message(const Message* const message) {
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switch (message->id) {
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case Message::ID::UpdateSpectrum:
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case Message::ID::SpectrumStreamingConfig:
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// channel_spectrum.on_message(message);
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break;
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case Message::ID::NoaaAptRxConfigure:
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configure(*reinterpret_cast<const NoaaAptRxConfigureMessage*>(message));
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break;
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case Message::ID::CaptureConfig:
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capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
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break;
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default:
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break;
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}
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}
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void NoaaAptRx::configure(const NoaaAptRxConfigureMessage& message) {
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(void)message;
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constexpr size_t decim_0_input_fs = baseband_fs;
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constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
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constexpr size_t decim_1_input_fs = decim_0_output_fs;
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decim_0.configure(taps_16k0_decim_0.taps);
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// decim_1.configure(message.decim_1_filter.taps); // Original .
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// TODO dynamic decim1 , with decimation 2 / 8 and 16 x taps , / 32 taps .
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// Temptatively , I splitted, in two WidebandFMAudio::configure_wfm / WidebandFMAudio::configure_wfmam and dynamically /2, /8 . (here /8)
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// decim_1.set<dsp::decimate::FIRC16xR16x16Decim2>().configure(message.decim_1_filter.taps); // for wfm
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// decim_1.set<dsp::decimate::FIRC16xR16x32Decim8>().configure(message.decim_1_filter.taps); // for wfmam
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decim_1.configure(taps_84k_wfmam_decim_1.taps); // for wfmam
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size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor; // wfmam, decim_1.decimation_factor() = /8 ,if applied after the line, decim_1.set<dsp::decimate::FIRC16xR16x16Decim2>().configure(message.decim_1_filter.taps);
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size_t demod_input_fs = decim_1_output_fs;
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// spectrum_interval_samples = decim_1_output_fs / spectrum_rate_hz;
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// spectrum_samples = 0;
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channel_filter_low_f = taps_84k_wfmam_decim_1.low_frequency_normalized * decim_1_input_fs;
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channel_filter_high_f = taps_84k_wfmam_decim_1.high_frequency_normalized * decim_1_input_fs;
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channel_filter_transition = taps_84k_wfmam_decim_1.transition_normalized * decim_1_input_fs;
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demod.configure(demod_input_fs, 17000);
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audio_filter.configure(taps_64_lp_1875_2166.taps);
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audio_output.configure(apt_audio_12k_notch_2k4_config, apt_audio_12k_lpf_2000hz_config);
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// channel_spectrum.set_decimation_factor(1);
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update_params();
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configured = true;
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}
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void NoaaAptRx::capture_config(const CaptureConfigMessage& message) {
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if (message.config) {
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audio_output.set_stream(std::make_unique<StreamInput>(message.config));
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} else {
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audio_output.set_stream(nullptr);
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}
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}
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int main() {
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audio::dma::init_audio_out();
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EventDispatcher event_dispatcher{std::make_unique<NoaaAptRx>()};
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event_dispatcher.run();
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return 0;
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}
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