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https://github.com/eried/portapack-mayhem.git
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802ac496e9
Xylos TX (CCIR tones) ;) Jammer update, still buggy and inefficient SD card module loader update
123 lines
3.0 KiB
C++
123 lines
3.0 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_afskrx.hpp"
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#include "sine_table.hpp"
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#include "portapack_shared_memory.hpp"
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using namespace lpc43xx;
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void AFSKRXProcessor::execute(buffer_c8_t buffer) {
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/* Called every 2048/3072000 second -- 1500Hz. */
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auto decimator_out = decimator.execute(buffer);
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const buffer_c16_t work_baseband_buffer {
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(complex16_t*)decimator_out.p,
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sizeof(*decimator_out.p) * decimator_out.count
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};
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/* 96kHz complex<int16_t>[64]
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* -> FIR filter, <6kHz (0.063fs) pass, gain 1.0
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* -> 48kHz int16_t[32] */
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auto channel = channel_filter.execute(decimator_out, work_baseband_buffer);
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const buffer_s16_t work_audio_buffer {
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(int16_t*)decimator_out.p,
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sizeof(*decimator_out.p) * decimator_out.count
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};
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/* 48kHz complex<int16_t>[32]
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* -> FM demodulation
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* -> 48kHz int16_t[32] */
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auto audio = demod.execute(channel, work_audio_buffer);
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/*static uint64_t audio_present_history = 0;
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const auto audio_present_now = squelch.execute(audio);
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audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
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const bool audio_present = (audio_present_history != 0);
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*/
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//if( !audio_present ) {
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// Zero audio buffer.
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/*for(size_t i=0; i<audio.count; i++) {
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if ((i % 3) > 1)
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audio.p[i] = 4096;
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else
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audio.p[i] = -4096;
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}*/
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//}
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audio_hpf.execute_in_place(audio);
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for(size_t i=0; i<audio.count; i++) {
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if (spur > 10) {
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if (audio.p[i] > 2000)
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sign = 1;
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if (audio.p[i] < -2000)
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sign = 0;
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spur = 0;
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} else {
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spur++;
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}
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if (sign != prev_sign) {
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if (freq_timer < 15) // 48
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bit = 0;
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else
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bit++;
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freq_timer = 0;
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}
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prev_sign = sign;
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if (freq_timer < 1000) freq_timer++; // TODO: Limit in a more intelligent way
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}
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if (bit_timer >= 40) {
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bit_timer = 0;
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// Check bit state here !
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} else {
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bit_timer++;
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}
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if (sc >= 600) {
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sc = 0;
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AFSKDataMessage message;
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memcpy(message.data,aud,128*2);
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shared_memory.application_queue.push(message);
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audc = 0;
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} else {
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sc++;
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}
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if (audc < 4) {
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memcpy(aud+(audc*32),audio.p,32*2);
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audc++;
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}
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fill_audio_buffer(audio);
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}
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void AFSKRXProcessor::data_handler(
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const double data
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) {
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/*AFSKDataMessage message;
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message.data = 'T';
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shared_memory.application_queue.push(message);*/
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}
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