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122 lines
4.9 KiB
122 lines
4.9 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/lc/tdulc/LC_IDEN_UP.h"
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#include "Log.h"
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#include "Utils.h"
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using namespace p25::lc::tdulc;
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using namespace p25::lc;
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using namespace p25;
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#include <cassert>
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#include <cmath>
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Initializes a new instance of the LC_IDEN_UP class.
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/// </summary>
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LC_IDEN_UP::LC_IDEN_UP() : TDULC()
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{
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m_lco = p25::LC_IDEN_UP;
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}
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/// <summary>
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/// Decode a terminator data unit w/ link control.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if TDULC was decoded, otherwise false.</returns>
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bool LC_IDEN_UP::decode(const uint8_t* data)
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{
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assert(data != NULL);
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/* stub */
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return true;
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}
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/// <summary>
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/// Encode a terminator data unit w/ link control.
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/// </summary>
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/// <param name="data"></param>
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void LC_IDEN_UP::encode(uint8_t* data)
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{
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assert(data != NULL);
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ulong64_t rsValue = 0U;
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m_implicit = true;
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if ((m_siteIdenEntry.chBandwidthKhz() != 0.0F) && (m_siteIdenEntry.chSpaceKhz() != 0.0F) &&
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(m_siteIdenEntry.txOffsetMhz() != 0U) && (m_siteIdenEntry.baseFrequency() != 0U)) {
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if (m_siteIdenEntry.baseFrequency() < 762000000U) {
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uint32_t calcSpace = (uint32_t)(m_siteIdenEntry.chSpaceKhz() / 0.125);
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float fCalcTxOffset = (fabs(m_siteIdenEntry.txOffsetMhz()) / m_siteIdenEntry.chSpaceKhz()) * 1000.0F;
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uint32_t uCalcTxOffset = (uint32_t)fCalcTxOffset;
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if (m_siteIdenEntry.txOffsetMhz() > 0.0F)
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uCalcTxOffset |= 0x2000U; // this sets a positive offset ...
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uint32_t calcBaseFreq = (uint32_t)(m_siteIdenEntry.baseFrequency() / 5);
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uint8_t chanBw = (m_siteIdenEntry.chBandwidthKhz() >= 12.5F) ? P25_IDEN_UP_VU_BW_125K : P25_IDEN_UP_VU_BW_625K;
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rsValue = m_siteIdenEntry.channelId(); // Channel ID
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rsValue = (rsValue << 4) + chanBw; // Channel Bandwidth
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rsValue = (rsValue << 14) + uCalcTxOffset; // Transmit Offset
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rsValue = (rsValue << 10) + calcSpace; // Channel Spacing
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rsValue = (rsValue << 32) + calcBaseFreq; // Base Frequency
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} else {
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uint32_t calcSpace = (uint32_t)(m_siteIdenEntry.chSpaceKhz() / 0.125);
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float fCalcTxOffset = (fabs(m_siteIdenEntry.txOffsetMhz()) * 1000000.0F) / 250000.0F;
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uint32_t uCalcTxOffset = (uint32_t)fCalcTxOffset;
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if (m_siteIdenEntry.txOffsetMhz() > 0.0F)
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uCalcTxOffset |= 0x2000U; // this sets a positive offset ...
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uint32_t calcBaseFreq = (uint32_t)(m_siteIdenEntry.baseFrequency() / 5);
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uint16_t chanBw = (uint16_t)((m_siteIdenEntry.chBandwidthKhz() * 1000) / 125);
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rsValue = m_siteIdenEntry.channelId(); // Channel ID
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rsValue = (rsValue << 4) + chanBw; // Channel Bandwidth
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rsValue = (rsValue << 14) + uCalcTxOffset; // Transmit Offset
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rsValue = (rsValue << 10) + calcSpace; // Channel Spacing
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rsValue = (rsValue << 32) + calcBaseFreq; // Base Frequency
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}
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}
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else {
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LogError(LOG_P25, "TDULC::encodeLC(), invalid values for LC_IDEN_UP, baseFrequency = %uHz, txOffsetMhz = %fMHz, chBandwidthKhz = %fKHz, chSpaceKhz = %fKHz",
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m_siteIdenEntry.baseFrequency(), m_siteIdenEntry.txOffsetMhz(), m_siteIdenEntry.chBandwidthKhz(),
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m_siteIdenEntry.chSpaceKhz());
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return; // blatently ignore creating this TSBK
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}
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std::unique_ptr<uint8_t[]> rs = TDULC::fromValue(rsValue);
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TDULC::encode(data, rs.get());
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}
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