mirror of
https://github.com/eried/portapack-mayhem.git
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70 lines
1.7 KiB
C++
70 lines
1.7 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 "proc_wideband_spectrum.hpp"
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#include "event_m4.hpp"
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#include "i2s.hpp"
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using namespace lpc43xx;
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#include "dsp_fft.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <array>
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void WidebandSpectrum::execute(const buffer_c8_t& buffer) {
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// 2048 complex8_t samples per buffer.
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// 102.4us per buffer. 20480 instruction cycles per buffer.
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static int phase = 0;
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if( phase == 0 ) {
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std::fill(spectrum.begin(), spectrum.end(), 0);
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}
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for(size_t i=0; i<spectrum.size(); i++) {
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// TODO: Removed window-presum windowing, due to lack of available code RAM.
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// TODO: Apply window to improve spectrum bin sidelobes.
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spectrum[i] += buffer.p[i + 0];
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spectrum[i] += buffer.p[i + 1024];
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}
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if( phase == 127 ) {
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const buffer_c16_t buffer_c16 {
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spectrum.data(),
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spectrum.size(),
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buffer.sampling_rate
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};
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channel_spectrum.feed(
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buffer_c16,
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0, 0
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);
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phase = 0;
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} else {
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phase++;
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}
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i2s::i2s0::tx_mute();
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}
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