mayhem-firmware/firmware/baseband/proc_wideband_spectrum.cpp

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/*
* Copyright (C) 2015 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_wideband_spectrum.hpp"
#include "event_m4.hpp"
#include "dsp_fft.hpp"
#include "event_m4.hpp"
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#include <cstdint>
#include <cstddef>
#include <array>
void WidebandSpectrum::execute(const buffer_c8_t& buffer) {
// 2048 complex8_t samples per buffer.
// 102.4us per buffer. 20480 instruction cycles per buffer.
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if( phase == 0 ) {
std::fill(spectrum.begin(), spectrum.end(), 0);
}
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for(size_t i=0; i<spectrum.size(); i++) {
// TODO: Removed window-presum windowing, due to lack of available code RAM.
// TODO: Apply window to improve spectrum bin sidelobes.
spectrum[i] += buffer.p[i + 0];
spectrum[i] += buffer.p[i + 1024];
}
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if( phase == 127 ) {
const buffer_c16_t buffer_c16 {
spectrum.data(),
spectrum.size(),
buffer.sampling_rate
};
channel_spectrum.feed(
buffer_c16,
0, 0
);
phase = 0;
} else {
phase++;
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}
}
void WidebandSpectrum::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
default:
break;
}
}
void run() {
EventDispatcher event_dispatcher { std::make_unique<WidebandSpectrum>() };
event_dispatcher.run();
}