mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 04:28:10 +00:00
aaa1bc3a09
Allows handling of data during LCD "vertical retrace", independent of other baseband->application messages. A bit kludgy still...
98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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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 "spectrum_collector.hpp"
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#include "dsp_fft.hpp"
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#include "utility.hpp"
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#include "event_m4.hpp"
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#include "portapack_shared_memory.hpp"
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#include <algorithm>
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void SpectrumCollector::set_decimation_factor(
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const size_t decimation_factor
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) {
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channel_spectrum_decimator.set_factor(decimation_factor);
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}
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/* TODO: Refactor to register task with idle thread?
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* It's sad that the idle thread has to call all the way back here just to
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* perform the deferred task on the buffer of data we prepared.
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*/
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void SpectrumCollector::feed(
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const buffer_c16_t& channel,
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const uint32_t filter_pass_frequency,
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const uint32_t filter_stop_frequency
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) {
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// Called from baseband processing thread.
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channel_filter_pass_frequency = filter_pass_frequency;
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channel_filter_stop_frequency = filter_stop_frequency;
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channel_spectrum_decimator.feed(
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channel,
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[this](const buffer_c16_t& data) {
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this->post_message(data);
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}
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);
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}
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void SpectrumCollector::post_message(const buffer_c16_t& data) {
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// Called from baseband processing thread.
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if( !channel_spectrum_request_update ) {
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fft_swap(data, channel_spectrum);
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channel_spectrum_sampling_rate = data.sampling_rate;
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channel_spectrum_request_update = true;
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events_flag(EVT_MASK_SPECTRUM);
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}
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}
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void SpectrumCollector::update() {
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// Called from idle thread (after EVT_MASK_SPECTRUM is flagged)
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if( channel_spectrum_request_update ) {
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/* Decimated buffer is full. Compute spectrum. */
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channel_spectrum_request_update = false;
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fft_c_preswapped(channel_spectrum);
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ChannelSpectrum spectrum;
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for(size_t i=0; i<spectrum.db.size(); i++) {
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// Three point Hamming window.
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const auto corrected_sample = channel_spectrum[i] * 0.54f
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+ (channel_spectrum[(i-1) & 0xff] + channel_spectrum[(i+1) & 0xff]) * -0.23f;
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const auto mag2 = magnitude_squared(corrected_sample);
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const float db = complex16_mag_squared_to_dbv_norm(mag2);
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constexpr float mag_scale = 5.0f;
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const unsigned int v = (db * mag_scale) + 255.0f;
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spectrum.db[i] = std::max(0U, std::min(255U, v));
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}
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/* TODO: Rename .db -> .magnitude, or something more (less!) accurate. */
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spectrum.db_count = spectrum.db.size();
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spectrum.sampling_rate = channel_spectrum_sampling_rate;
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spectrum.channel_filter_pass_frequency = channel_filter_pass_frequency;
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spectrum.channel_filter_stop_frequency = channel_filter_stop_frequency;
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fifo.in(spectrum);
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FIFONotifyMessage message { &fifo };
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shared_memory.application_queue.push(message);
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}
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}
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