portapack-mayhem/firmware/baseband/proc_capture.cpp

/*
 * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
 *
 * 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_capture.hpp"

#include "dsp_fir_taps.hpp"

#include "event_m4.hpp"

#include "utility.hpp"

CaptureProcessor::CaptureProcessor() {
	const auto& decim_0_filter = taps_200k_decim_0;
	constexpr size_t decim_0_input_fs = baseband_fs;
	constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;

	const auto& decim_1_filter = taps_200k_decim_1;
	constexpr size_t decim_1_input_fs = decim_0_output_fs;
	constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;

	decim_0.configure(decim_0_filter.taps, 33554432);
	decim_1.configure(decim_1_filter.taps, 131072);

	channel_filter_pass_f = decim_1_filter.pass_frequency_normalized * decim_1_input_fs;
	channel_filter_stop_f = decim_1_filter.stop_frequency_normalized * decim_1_input_fs;

	spectrum_interval_samples = decim_1_output_fs / spectrum_rate_hz;
	spectrum_samples = 0;

	channel_spectrum.set_decimation_factor(1);
}

void CaptureProcessor::execute(const buffer_c8_t& buffer) {
	/* 2.4576MHz, 2048 samples */
	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;
	const auto& channel = decimator_out;

	if( stream ) {
		const size_t bytes_to_write = sizeof(*decimator_out.p) * decimator_out.count;
		const auto result = stream->write(decimator_out.p, bytes_to_write);
	}

	feed_channel_stats(channel);

	spectrum_samples += channel.count;
	if( spectrum_samples >= spectrum_interval_samples ) {
		spectrum_samples -= spectrum_interval_samples;
		channel_spectrum.feed(channel, channel_filter_pass_f, channel_filter_stop_f);
	}
}

void CaptureProcessor::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::CaptureConfig:
		capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
		break;

	default:
		break;
	}
}

void CaptureProcessor::capture_config(const CaptureConfigMessage& message) {
	if( message.config ) {
		stream = std::make_unique<StreamInput>(message.config);
	} else {
		stream.reset();
	}
}

void run() {
	EventDispatcher event_dispatcher { std::make_unique<CaptureProcessor>() };
	event_dispatcher.run();
}