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Extract spectrum collector from BasebandProcessor.

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Code size improvement, and less confused classes. :-)
This commit is contained in:
Jared Boone 2015-12-11 12:26:45 -08:00
parent 75b1cc25ff
commit 088f60f2bc
15 changed files with 193 additions and 86 deletions
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79
firmware/baseband/spectrum_collector.cpp Normal file
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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 "spectrum_collector.hpp"
#include "dsp_fft.hpp"
#include "utility.hpp"
#include "event_m4.hpp"
#include "portapack_shared_memory.hpp"
#include <algorithm>
void SpectrumCollector::update() {
// Called from idle thread (after EVT_MASK_SPECTRUM is flagged)
if( channel_spectrum_request_update ) {
/* Decimated buffer is full. Compute spectrum. */
channel_spectrum_request_update = false;
fft_c_preswapped(channel_spectrum);
ChannelSpectrumMessage spectrum_message;
for(size_t i=0; i<spectrum_message.spectrum.db.size(); i++) {
const auto mag2 = magnitude_squared(channel_spectrum[i]);
const float db = complex16_mag_squared_to_dbv_norm(mag2);
constexpr float mag_scale = 5.0f;
const unsigned int v = (db * mag_scale) + 255.0f;
spectrum_message.spectrum.db[i] = std::max(0U, std::min(255U, v));
}
/* TODO: Rename .db -> .magnitude, or something more (less!) accurate. */
spectrum_message.spectrum.db_count = spectrum_message.spectrum.db.size();
spectrum_message.spectrum.sampling_rate = channel_spectrum_sampling_rate;
spectrum_message.spectrum.channel_filter_pass_frequency = channel_filter_pass_frequency;
spectrum_message.spectrum.channel_filter_stop_frequency = channel_filter_stop_frequency;
shared_memory.application_queue.push(spectrum_message);
}
}
void SpectrumCollector::feed(
const buffer_c16_t& channel,
const uint32_t filter_pass_frequency,
const uint32_t filter_stop_frequency
) {
channel_filter_pass_frequency = filter_pass_frequency;
channel_filter_stop_frequency = filter_stop_frequency;
channel_spectrum_decimator.feed(
channel,
[this](const buffer_c16_t& data) {
this->post_message(data);
}
);
}
void SpectrumCollector::post_message(const buffer_c16_t& data) {
if( !channel_spectrum_request_update ) {
fft_swap(data, channel_spectrum);
channel_spectrum_sampling_rate = data.sampling_rate;
channel_spectrum_request_update = true;
events_flag(EVT_MASK_SPECTRUM);
}
}