kopia lustrzana https://github.com/f4exb/sdrangel
145 wiersze
6.1 KiB
C++
145 wiersze
6.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2022 Edouard Griffiths, F4EXB //
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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 as version 3 of the License, or //
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// (at your option) 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 V3 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. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include "m17/M17Modulator.h"
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#include "m17modprocessor.h"
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendSMS, Message)
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M17ModProcessor::M17ModProcessor() :
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m_m17Modulator("MYCALL", "")
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{
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m_basebandFifo.setSize(96000);
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connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
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}
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M17ModProcessor::~M17ModProcessor()
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{}
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bool M17ModProcessor::handleMessage(const Message& cmd)
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{
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if (MsgSendSMS::match(cmd))
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{
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const MsgSendSMS& notif = (const MsgSendSMS&) cmd;
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QByteArray packetBytes = notif.getSMSText().toUtf8();
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packetBytes.prepend(0x05); // SMS standard type
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packetBytes.truncate(798); // Maximum packet size is 798 payload + 2 bytes CRC = 800 bytes (32*25)
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processPacket(notif.getSourceCall(), notif.getDestCall(), packetBytes);
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// test(notif.getSourceCall(), notif.getDestCall());
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return true;
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}
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return false;
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}
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void M17ModProcessor::handleInputMessages()
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{
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Message* message;
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while ((message = m_inputMessageQueue.pop()) != nullptr)
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{
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if (handleMessage(*message)) {
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delete message;
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}
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}
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}
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void M17ModProcessor::test(const QString& sourceCall, const QString& destCall)
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{
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m_m17Modulator.source(sourceCall.toStdString());
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m_m17Modulator.dest(destCall.toStdString());
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for (int i = 0; i < 25; i++) {
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send_preamble();
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}
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}
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void M17ModProcessor::processPacket(const QString& sourceCall, const QString& destCall, const QByteArray& packetBytes)
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{
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qDebug("M17ModProcessor::processPacket: %s to %s: %s", qPrintable(sourceCall), qPrintable(destCall), qPrintable(packetBytes));
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m_m17Modulator.source(sourceCall.toStdString());
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m_m17Modulator.dest(destCall.toStdString());
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send_preamble(); // preamble
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// LSF
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std::array<uint8_t, 30> lsf;
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std::array<int8_t, 368> lsf_frame = mobilinkd::M17Modulator::make_lsf(lsf, sourceCall.toStdString(), destCall.toStdString());
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output_baseband(mobilinkd::M17Modulator::LSF_SYNC_WORD, lsf_frame);
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// Packets
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int remainderCount = packetBytes.size();
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int packetCount = 0;
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std::array<int8_t, 368> packet_frame;
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// std::copy(mobilinkd::M17Modulator::DATA_SYNC_WORD.begin(), mobilinkd::M17Modulator::DATA_SYNC_WORD.end(), fullframe_symbols.begin());
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mobilinkd::M17Modulator::packet_t packet;
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while (remainderCount > 25)
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{
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std::copy(packetBytes.begin() + (packetCount*25), packetBytes.begin() + ((packetCount+1)*25), packet.begin());
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packet_frame = m_m17Modulator.make_packet_frame(packetCount, 25, false, packet);
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output_baseband(mobilinkd::M17Modulator::PACKET_SYNC_WORD, packet_frame);
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remainderCount -= 25;
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packetCount++;
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}
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std::copy(packetBytes.begin() + (packetCount*25), packetBytes.begin() + (packetCount*25) + remainderCount, packet.begin());
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packet_frame = m_m17Modulator.make_packet_frame(packetCount, remainderCount, true, packet);
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output_baseband(mobilinkd::M17Modulator::PACKET_SYNC_WORD, packet_frame);
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qDebug("M17ModProcessor::processPacket: last: packetCount: %d remainderCount: %d", packetCount, remainderCount);
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send_eot(); // EOT
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}
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void M17ModProcessor::send_preamble()
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{
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// Preamble is simple... bytes -> symbols -> baseband.
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std::array<uint8_t, 48> preamble_bytes;
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preamble_bytes.fill(0x77);
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std::array<int8_t, 192> preamble_symbols = mobilinkd::M17Modulator::bytes_to_symbols(preamble_bytes);
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std::array<int16_t, 1920> preamble_baseband = m_m17Modulator.symbols_to_baseband(preamble_symbols);
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m_basebandFifo.write(preamble_baseband.data(), 1920);
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}
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void M17ModProcessor::send_eot()
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{
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std::array<uint8_t, 2> EOT_SYNC = { 0x55, 0x5D };
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std::array<uint8_t, 48> eot_bytes;
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for (unsigned int i = 0; i < eot_bytes.size(); i += 2) {
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std::copy(EOT_SYNC.begin(), EOT_SYNC.end(), eot_bytes.begin() + i);
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}
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std::array<int8_t, 192> eot_symbols = mobilinkd::M17Modulator::bytes_to_symbols(eot_bytes);
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std::array<int16_t, 1920> eot_baseband = m_m17Modulator.symbols_to_baseband(eot_symbols);
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m_basebandFifo.write(eot_baseband.data(), 1920);
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}
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void M17ModProcessor::output_baseband(std::array<uint8_t, 2> sync_word, const std::array<int8_t, 368>& frame)
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{
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std::array<int8_t, 184> symbols = mobilinkd::M17Modulator::bits_to_symbols(frame); // 368 bits -> 184 dibit symbols
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std::array<int8_t, 8> sw = mobilinkd::M17Modulator::bytes_to_symbols(sync_word); // 16 bits -> 8 dibit symbols
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std::array<int8_t, 192> temp; // 384 = 368 + 16 bits -> 192 dibit symbols
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auto fit = std::copy(sw.begin(), sw.end(), temp.begin()); // start with sync word dibits
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std::copy(symbols.begin(), symbols.end(), fit); // then the frame dibits
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std::array<int16_t, 1920> baseband = m_m17Modulator.symbols_to_baseband(temp); // 1920 48 kS/s int16_t samples
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m_basebandFifo.write(baseband.data(), 1920);
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}
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