mayhem-firmware/firmware/baseband/proc_gps_sim.cpp

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_gps_sim.hpp"
#include "sine_table_int8.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
#include "utility.hpp"
GPSReplayProcessor::GPSReplayProcessor() {
channel_filter_low_f = taps_200k_decim_1.low_frequency_normalized * 1000000;
channel_filter_high_f = taps_200k_decim_1.high_frequency_normalized * 1000000;
channel_filter_transition = taps_200k_decim_1.transition_normalized * 1000000;
spectrum_samples = 0;
channel_spectrum.set_decimation_factor(1);
configured = false;
baseband_thread.start();
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}
void GPSReplayProcessor::execute(const buffer_c8_t& buffer) {
/* 2.6MHz, 2048 samples */
if (!configured || !stream) return;
// File data is in C8 format, which is what we need
// File samplerate is 2.6MHz, which is what we need
// To fill up the 2048-sample C8 buffer @ 2 bytes per sample = 4096 bytes
const size_t bytes_to_read = sizeof(*buffer.p) * 1 * (buffer.count);
size_t bytes_read_this_iteration = stream->read(iq_buffer.p, bytes_to_read);
size_t samples_read_this_iteration = bytes_read_this_iteration / sizeof(*buffer.p);
bytes_read += bytes_read_this_iteration;
// NB: Couldn't we have just read the data into buffer.p to start with, or some DMA/cache coherency concern?
//
// for (size_t i = 0; i < buffer.count; i++) {
// auto re_out = iq_buffer.p[i].real();
// auto im_out = iq_buffer.p[i].imag();
// buffer.p[i] = {(int8_t)re_out, (int8_t)im_out};
// }
memcpy(buffer.p, iq_buffer.p, bytes_read_this_iteration); // memcpy should be more efficient than 1 byte at a time
spectrum_samples += samples_read_this_iteration;
if (spectrum_samples >= spectrum_interval_samples) {
spectrum_samples -= spectrum_interval_samples;
txprogress_message.progress = bytes_read; // Inform UI about progress
txprogress_message.done = false;
shared_memory.application_queue.push(txprogress_message);
}
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}
void GPSReplayProcessor::on_message(const Message* const message) {
switch (message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::SamplerateConfig:
samplerate_config(*reinterpret_cast<const SamplerateConfigMessage*>(message));
break;
case Message::ID::ReplayConfig:
configured = false;
bytes_read = 0;
replay_config(*reinterpret_cast<const ReplayConfigMessage*>(message));
break;
// App has prefilled the buffers, we're ready to go now
case Message::ID::FIFOData:
configured = true;
break;
default:
break;
}
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}
void GPSReplayProcessor::samplerate_config(const SamplerateConfigMessage& message) {
baseband_fs = message.sample_rate;
baseband_thread.set_sampling_rate(baseband_fs);
spectrum_interval_samples = baseband_fs / spectrum_rate_hz;
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}
void GPSReplayProcessor::replay_config(const ReplayConfigMessage& message) {
if (message.config) {
stream = std::make_unique<StreamOutput>(message.config);
// Tell application that the buffers and FIFO pointers are ready, prefill
shared_memory.application_queue.push(sig_message);
} else {
stream.reset();
}
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}
int main() {
EventDispatcher event_dispatcher{std::make_unique<GPSReplayProcessor>()};
event_dispatcher.run();
return 0;
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}