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267 lines
7.9 KiB
267 lines
7.9 KiB
/**
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* Digital Voice Modem - Host Software
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Host Software
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*
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*/
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/*
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* Copyright (C) 2022 by Bryan Biedenkapp N2PLL
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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 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 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "Defines.h"
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#include "p25/P25Defines.h"
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#include "p25/dfsi/DFSIDefines.h"
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#include "p25/packet/Trunk.h"
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#include "p25/dfsi/packet/DFSITrunk.h"
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#include "p25/P25Utils.h"
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#include "p25/Sync.h"
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#include "Log.h"
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#include "Utils.h"
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using namespace p25;
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using namespace p25::dfsi;
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using namespace p25::dfsi::packet;
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Process a data frame from the RF interface.
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/// </summary>
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/// <param name="data">Buffer containing data frame.</param>
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/// <param name="len">Length of data frame.</param>
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/// <param name="preDecodedTSBK">Pre-decoded TSBK.</param>
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/// <returns></returns>
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bool DFSITrunk::process(uint8_t* data, uint32_t len, lc::TSBK* preDecodedTSBK)
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{
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assert(data != nullptr);
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uint8_t tsbk[P25_TSBK_LENGTH_BYTES];
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::memset(tsbk, 0x00U, P25_TSBK_LENGTH_BYTES);
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if (!m_p25->m_control)
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return false;
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if (preDecodedTSBK != nullptr) {
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return Trunk::process(data + 2U, len, preDecodedTSBK);
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}
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else {
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if (m_rfDFSILC.decodeTSBK(data + 2U)) {
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return Trunk::process(tsbk, P25_TSBK_LENGTH_BYTES, m_rfDFSILC.tsbk());
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}
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}
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return false;
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}
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// ---------------------------------------------------------------------------
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// Protected Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Initializes a new instance of the DFSITrunk class.
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/// </summary>
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/// <param name="p25">Instance of the Control class.</param>
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/// <param name="network">Instance of the BaseNetwork class.</param>
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/// <param name="dumpTSBKData">Flag indicating whether TSBK data is dumped to the log.</param>
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/// <param name="debug">Flag indicating whether P25 debug is enabled.</param>
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/// <param name="verbose">Flag indicating whether P25 verbose logging is enabled.</param>
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DFSITrunk::DFSITrunk(Control* p25, network::BaseNetwork* network, bool dumpTSBKData, bool debug, bool verbose) :
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Trunk(p25, network, dumpTSBKData, debug, verbose)
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{
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/* stub */
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}
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/// <summary>
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/// Finalizes a instance of the DFSITrunk class.
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/// </summary>
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DFSITrunk::~DFSITrunk()
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{
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/* stub */
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}
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/// <summary>
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/// Helper to write a P25 TDU w/ link control packet.
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/// </summary>
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/// <param name="lc"></param>
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/// <param name="noNetwork"></param>
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void DFSITrunk::writeRF_TDULC(lc::TDULC* lc, bool noNetwork)
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{
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// for now this is ignored...
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}
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/// <summary>
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/// Helper to write a single-block P25 TSDU packet.
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/// </summary>
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/// <param name="tsbk"></param>
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/// <param name="noNetwork"></param>
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/// <param name="clearBeforeWrite"></param>
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/// <param name="force"></param>
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void DFSITrunk::writeRF_TSDU_SBF(lc::TSBK* tsbk, bool noNetwork, bool clearBeforeWrite, bool force)
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{
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if (!m_p25->m_control)
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return;
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assert(tsbk != nullptr);
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writeRF_DFSI_Start(P25_DFSI_TYPE_TSBK);
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uint8_t data[P25_TSDU_FRAME_LENGTH_BYTES + 2U];
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::memset(data + 2U, 0x00U, P25_TSDU_FRAME_LENGTH_BYTES);
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m_rfDFSILC.setFrameType(P25_DFSI_TSBK);
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m_rfDFSILC.setStartStop(P25_DFSI_START_FLAG);
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m_rfDFSILC.setType(P25_DFSI_TYPE_TSBK);
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m_rfDFSILC.tsbk(tsbk);
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// Generate Sync
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Sync::addP25Sync(data + 2U);
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// Generate NID
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m_p25->m_nid.encode(data + 2U, P25_DUID_TSDU);
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// Generate TSBK block
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tsbk->setLastBlock(true); // always set last block -- this a Single Block TSDU
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tsbk->encode(data + 2U);
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if (m_debug) {
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LogDebug(LOG_RF, P25_TSDU_STR " DFSI, lco = $%02X, mfId = $%02X, lastBlock = %u, AIV = %u, EX = %u, srcId = %u, dstId = %u, sysId = $%03X, netId = $%05X",
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tsbk->getLCO(), tsbk->getMFId(), tsbk->getLastBlock(), tsbk->getAIV(), tsbk->getEX(), tsbk->getSrcId(), tsbk->getDstId(),
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tsbk->getSysId(), tsbk->getNetId());
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Utils::dump(1U, "!!! *TSDU (SBF) TSBK Block Data", data + P25_PREAMBLE_LENGTH_BYTES + 2U, P25_TSBK_FEC_LENGTH_BYTES);
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}
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// Add busy bits
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P25Utils::addBusyBits(data + 2U, P25_TSDU_FRAME_LENGTH_BITS, true, false);
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// Set first busy bits to 1,1
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P25Utils::setBusyBits(data + 2U, P25_SS0_START, true, true);
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if (!noNetwork)
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writeNetworkRF(tsbk, data + 2U, true);
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if (!force) {
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if (clearBeforeWrite) {
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m_p25->m_modem->clearP25Data();
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m_p25->m_queue.clear();
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}
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}
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::memset(data + 2U, 0x00U, P25_TSDU_FRAME_LENGTH_BYTES);
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// Generate DFSI TSBK block
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m_rfDFSILC.encodeTSBK(data + 2U);
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data[0U] = modem::TAG_DATA;
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data[1U] = 0x00U;
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m_p25->addFrame(data, P25_DFSI_TSBK_FRAME_LENGTH_BYTES + 2U);
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writeRF_DSFI_Stop(P25_DFSI_TYPE_TSBK);
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}
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/// <summary>
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/// Helper to write a alternate multi-block trunking PDU packet.
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/// </summary>
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/// <param name="ambt"></param>
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/// <param name="clearBeforeWrite"></param>
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void DFSITrunk::writeRF_TSDU_AMBT(lc::AMBT* ambt, bool clearBeforeWrite)
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{
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if (!m_p25->m_control)
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return;
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assert(ambt != nullptr);
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// for now this is ignored...
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}
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/// <summary>
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/// Helper to write a network single-block P25 TSDU packet.
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/// </summary>
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/// <param name="tsbk"></param>
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void DFSITrunk::writeNet_TSDU(lc::TSBK* tsbk)
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{
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assert(tsbk != nullptr);
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uint8_t buffer[P25_DFSI_TSBK_FRAME_LENGTH_BYTES + 2U];
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::memset(buffer, 0x00U, P25_DFSI_TSBK_FRAME_LENGTH_BYTES + 2U);
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buffer[0U] = modem::TAG_DATA;
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buffer[1U] = 0x00U;
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// Regenerate TSDU Data
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m_netDFSILC.tsbk(tsbk);
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m_netDFSILC.encodeTSBK(buffer + 2U);
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m_p25->addFrame(buffer, P25_DFSI_TSBK_FRAME_LENGTH_BYTES + 2U, true);
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if (m_network != nullptr)
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m_network->resetP25();
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}
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/// <summary>
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/// Helper to write start DFSI data.
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/// </summary>
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/// <param name="type"></param>
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void DFSITrunk::writeRF_DFSI_Start(uint8_t type)
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{
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uint8_t buffer[P25_DFSI_SS_FRAME_LENGTH_BYTES + 2U];
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::memset(buffer, 0x00U, P25_DFSI_SS_FRAME_LENGTH_BYTES + 2U);
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// Generate Start/Stop
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m_rfDFSILC.setFrameType(P25_DFSI_START_STOP);
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m_rfDFSILC.setStartStop(P25_DFSI_START_FLAG);
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m_rfDFSILC.setType(type);
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// Generate Identifier Data
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m_rfDFSILC.encodeNID(buffer + 2U);
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buffer[0U] = modem::TAG_DATA;
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buffer[1U] = 0x00U;
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m_p25->addFrame(buffer, P25_DFSI_SS_FRAME_LENGTH_BYTES + 2U);
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}
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/// <suimmary>
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/// Helper to write stop DFSI data.
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/// </summary>
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/// <param name="type"></param>
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void DFSITrunk::writeRF_DSFI_Stop(uint8_t type)
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{
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uint8_t buffer[P25_DFSI_SS_FRAME_LENGTH_BYTES + 2U];
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::memset(buffer, 0x00U, P25_DFSI_SS_FRAME_LENGTH_BYTES + 2U);
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// Generate Start/Stop
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m_rfDFSILC.setFrameType(P25_DFSI_START_STOP);
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m_rfDFSILC.setStartStop(P25_DFSI_STOP_FLAG);
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m_rfDFSILC.setType(type);
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// Generate Identifier Data
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m_rfDFSILC.encodeNID(buffer + 2U);
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buffer[0U] = modem::TAG_EOT;
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buffer[1U] = 0x00U;
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// for whatever reason this is almost always sent twice
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for (uint8_t i = 0; i < 2;i ++) {
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m_p25->addFrame(buffer, P25_DFSI_SS_FRAME_LENGTH_BYTES + 2U);
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}
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}
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