mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-20 08:05:44 +00:00
258 lines
9.7 KiB
C++
258 lines
9.7 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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* Copyright (C) 2020 Shao
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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_nrfrx.hpp"
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#include "portapack_shared_memory.hpp"
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#include "event_m4.hpp"
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void NRFRxProcessor::execute(const buffer_c8_t& buffer) {
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if (!configured) return;
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// FM demodulation
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const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
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feed_channel_stats(decim_0_out);
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auto audio_oversampled = demod.execute(decim_0_out, work_audio_buffer);
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// Audio signal processing
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for (size_t c = 0; c < audio_oversampled.count; c++) {
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int g_srate = 4; // 4 for 250KPS
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// int g_srate = 1; //1 for 1MPS, not working yet
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int32_t current_sample = audio_oversampled.p[c]; // if I directly use this, some results can pass crc but not correct.
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rb_head++;
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rb_head = (rb_head) % RB_SIZE;
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rb_buf[rb_head] = current_sample;
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skipSamples = skipSamples - 1;
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if (skipSamples < 1) {
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int32_t threshold_tmp = 0;
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for (int c = 0; c < 8 * g_srate; c++) {
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threshold_tmp = threshold_tmp + (int32_t)rb_buf[(rb_head + c) % RB_SIZE];
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}
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g_threshold = (int32_t)threshold_tmp / (8 * g_srate);
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int transitions = 0;
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if (rb_buf[(rb_head + 9 * g_srate) % RB_SIZE] > g_threshold) {
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for (int c = 0; c < 8; c++) {
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if (rb_buf[(rb_head + c * g_srate) % RB_SIZE] > rb_buf[(rb_head + (c + 1) * g_srate) % RB_SIZE])
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transitions = transitions + 1;
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}
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} else {
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for (int c = 0; c < 8; c++) {
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if (rb_buf[(rb_head + c * g_srate) % RB_SIZE] < rb_buf[(rb_head + (c + 1) * g_srate) % RB_SIZE])
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transitions = transitions + 1;
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}
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}
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bool packet_detected = false;
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// if ( transitions==4 && abs(g_threshold)<15500)
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if (transitions == 4 && abs(g_threshold) < 15500) {
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int packet_length = 0;
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uint8_t tmp_buf[10];
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uint8_t packet_data[500];
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uint8_t packet_packed[50];
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uint16_t pcf;
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uint32_t packet_crc;
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uint32_t calced_crc;
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uint64_t packet_addr_l;
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/* extract address */
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packet_addr_l = 0;
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for (int t = 0; t < 5; t++) {
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bool current_bit;
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uint8_t byte = 0;
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for (int c = 0; c < 8; c++) {
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if (rb_buf[(rb_head + (1 * 8 + t * 8 + c) * g_srate) % RB_SIZE] > g_threshold)
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current_bit = true;
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else
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current_bit = false;
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byte |= current_bit << (7 - c);
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}
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tmp_buf[t] = byte;
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}
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for (int t = 0; t < 5; t++) packet_addr_l |= ((uint64_t)tmp_buf[t]) << (4 - t) * 8;
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// channel_number = 26;
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/* extract pcf */
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for (int t = 0; t < 2; t++) {
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bool current_bit;
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uint8_t byte = 0;
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for (int c = 0; c < 8; c++) {
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if (rb_buf[(rb_head + (6 * 8 + t * 8 + c) * g_srate) % RB_SIZE] > g_threshold)
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current_bit = true;
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else
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current_bit = false;
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byte |= current_bit << (7 - c);
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}
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tmp_buf[t] = byte;
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}
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pcf = tmp_buf[0] << 8 | tmp_buf[1];
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pcf >>= 7;
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/* extract packet length, avoid excessive length packets */
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if (packet_length == 0)
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packet_length = (int)pcf >> 3;
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if (packet_length > 32)
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packet_detected = false;
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/* extract data */
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for (int t = 0; t < packet_length; t++) {
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bool current_bit;
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uint8_t byte = 0;
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for (int c = 0; c < 8; c++) {
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if (rb_buf[(rb_head + (6 * 8 + 9 + t * 8 + c) * g_srate) % RB_SIZE] > g_threshold)
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current_bit = true;
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else
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current_bit = false;
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byte |= current_bit << (7 - c);
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}
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packet_data[t] = byte;
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}
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/* Prepare packed bit stream for CRC calculation */
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uint64_t packet_header = packet_addr_l;
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packet_header <<= 9;
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packet_header |= pcf;
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for (int c = 0; c < 7; c++) {
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packet_packed[c] = (packet_header >> ((6 - c) * 8)) & 0xFF;
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}
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for (int c = 0; c < packet_length; c++) {
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packet_packed[c + 7] = packet_data[c];
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}
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/* calculate packet crc */
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const uint8_t* data = packet_packed;
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size_t data_len = 7 + packet_length;
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bool bit;
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uint8_t cc;
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uint_fast16_t crc = 0x3C18;
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while (data_len--) {
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cc = *data++;
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for (uint8_t i = 0x80; i > 0; i >>= 1) {
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bit = crc & 0x8000;
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if (cc & i) {
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bit = !bit;
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}
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crc <<= 1;
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if (bit) {
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crc ^= 0x1021;
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}
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}
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crc &= 0xffff;
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}
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calced_crc = (uint16_t)(crc & 0xffff);
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/* extract crc */
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for (int t = 0; t < 2; t++) {
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bool current_bit;
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uint8_t byte = 0;
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for (int c = 0; c < 8; c++) {
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if (rb_buf[(rb_head + ((6 + packet_length) * 8 + 9 + t * 8 + c) * g_srate) % RB_SIZE] > g_threshold)
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current_bit = true;
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else
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current_bit = false;
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byte |= current_bit << (7 - c);
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}
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tmp_buf[t] = byte;
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}
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packet_crc = tmp_buf[0] << 8 | tmp_buf[1];
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/* NRF24L01+ packet found, dump information */
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// if (packet_addr_l==0xE7E7E7E7)
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if (packet_crc == calced_crc) {
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data_message.is_data = false;
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data_message.value = 'A';
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shared_memory.application_queue.push(data_message);
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data_message.is_data = true;
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data_message.value = packet_addr_l;
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shared_memory.application_queue.push(data_message);
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for (int c = 0; c < 7; c++) {
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data_message.is_data = true;
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data_message.value = packet_addr_l >> 8;
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shared_memory.application_queue.push(data_message);
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}
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/*data_message.is_data = true;
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data_message.value = packet_addr_l;
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shared_memory.application_queue.push(data_message);
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data_message.is_data = true;
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data_message.value = packet_addr_l >> 8;
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shared_memory.application_queue.push(data_message);*/
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data_message.is_data = false;
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data_message.value = 'B';
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shared_memory.application_queue.push(data_message);
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for (int c = 0; c < packet_length; c++) {
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data_message.is_data = true;
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data_message.value = packet_data[c];
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shared_memory.application_queue.push(data_message);
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}
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data_message.is_data = false;
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data_message.value = 'C';
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shared_memory.application_queue.push(data_message);
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packet_detected = true;
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} else
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packet_detected = false;
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}
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if (packet_detected) {
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skipSamples = 20;
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}
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}
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}
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}
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void NRFRxProcessor::on_message(const Message* const message) {
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if (message->id == Message::ID::NRFRxConfigure)
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configure(*reinterpret_cast<const NRFRxConfigureMessage*>(message));
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}
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void NRFRxProcessor::configure(const NRFRxConfigureMessage& message) {
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(void)message; // avoir unused warning
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decim_0.configure(taps_200k_wfm_decim_0.taps);
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decim_1.configure(taps_200k_wfm_decim_1.taps);
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demod.configure(audio_fs, 5000);
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configured = true;
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}
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int main() {
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EventDispatcher event_dispatcher{std::make_unique<NRFRxProcessor>()};
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event_dispatcher.run();
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return 0;
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}
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