mirror of
https://github.com/eried/portapack-mayhem.git
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102 lines
3.1 KiB
C++
102 lines
3.1 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_tpms.hpp"
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#include "portapack_shared_memory.hpp"
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#include "i2s.hpp"
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using namespace lpc43xx;
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#include "dsp_fir_taps.hpp"
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// IFIR image-reject filter: fs=2457600, pass=100000, stop=407200, decim=4, fout=614400
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static constexpr fir_taps_real<24> taps_200k_decim_0 = {
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.pass_frequency_normalized = 100000.0f / 2457600.0f,
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.stop_frequency_normalized = 407200.0f / 2457600.0f,
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.taps = { {
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90, 94, 4, -240, -570, -776, -563, 309,
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1861, 3808, 5618, 6710, 6710, 5618, 3808, 1861,
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309, -563, -776, -570, -240, 4, 94, 90,
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} },
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};
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// IFIR prototype filter: fs=614400, pass=100000, stop=207200, decim=2, fout=307200
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static constexpr fir_taps_real<16> taps_200k_decim_1 = {
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.pass_frequency_normalized = 100000.0f / 614400.0f,
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.stop_frequency_normalized = 207200.0f / 614400.0f,
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.taps = { {
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-132, -256, 545, 834, -1507, -2401, 4666, 14583,
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14583, 4666, -2401, -1507, 834, 545, -256, -132,
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} },
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};
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TPMSProcessor::TPMSProcessor() {
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decim_0.configure(taps_200k_decim_0.taps, 33554432);
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decim_1.configure(taps_200k_decim_1.taps, 131072);
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}
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void TPMSProcessor::execute(const buffer_c8_t& buffer) {
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/* 2.4576MHz, 2048 samples */
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std::array<complex16_t, 512> dst;
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const buffer_c16_t dst_buffer {
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dst.data(),
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dst.size()
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};
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const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
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const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
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const auto decimator_out = decim_1_out;
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/* 76.8kHz, 64 samples */
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feed_channel_stats(decimator_out);
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/* No spectrum display while FSK decoding.
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feed_channel_spectrum(
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channel,
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decimator_out.sampling_rate * channel_filter_taps.pass_frequency_normalized,
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decimator_out.sampling_rate * channel_filter_taps.stop_frequency_normalized
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);
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*/
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for(size_t i=0; i<decimator_out.count; i++) {
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if( mf.execute_once(decimator_out.p[i]) ) {
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clock_recovery(mf.get_output());
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}
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}
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i2s::i2s0::tx_mute();
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}
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void TPMSProcessor::consume_symbol(
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const float raw_symbol
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) {
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const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
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packet_builder.execute(sliced_symbol);
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}
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void TPMSProcessor::payload_handler(
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const baseband::Packet& packet
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) {
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const TPMSPacketMessage message { packet };
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shared_memory.application_queue.push(message);
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}
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