You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
145 lines
4.9 KiB
145 lines
4.9 KiB
/**
|
|
* Digital Voice Modem - Host Software
|
|
* GPLv2 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* @package DVM / Host Software
|
|
*
|
|
*/
|
|
/*
|
|
* Copyright (C) 2022 by Bryan Biedenkapp N2PLL
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include "Defines.h"
|
|
#include "p25/lc/tsbk/OSP_SYNC_BCAST.h"
|
|
#include "Log.h"
|
|
#include "Utils.h"
|
|
|
|
using namespace p25::lc::tsbk;
|
|
using namespace p25::lc;
|
|
using namespace p25;
|
|
|
|
#include <cassert>
|
|
#include <cmath>
|
|
#include <chrono>
|
|
#include <ctime>
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Public Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the OSP_SYNC_BCAST class.
|
|
/// </summary>
|
|
OSP_SYNC_BCAST::OSP_SYNC_BCAST() : TSBK(),
|
|
m_microslotCount(0U)
|
|
{
|
|
m_lco = TSBK_OSP_SYNC_BCAST;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Decode a trunking signalling block.
|
|
/// </summary>
|
|
/// <param name="data"></param>
|
|
/// <param name="rawTSBK"></param>
|
|
/// <returns>True, if TSBK was decoded, otherwise false.</returns>
|
|
bool OSP_SYNC_BCAST::decode(const uint8_t* data, bool rawTSBK)
|
|
{
|
|
assert(data != NULL);
|
|
|
|
/* stub */
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encode a trunking signalling block.
|
|
/// </summary>
|
|
/// <param name="data"></param>
|
|
/// <param name="rawTSBK"></param>
|
|
/// <param name="noTrellis"></param>
|
|
void OSP_SYNC_BCAST::encode(uint8_t* data, bool rawTSBK, bool noTrellis)
|
|
{
|
|
assert(data != NULL);
|
|
|
|
ulong64_t tsbkValue = 0U;
|
|
|
|
std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
|
|
time_t tt = std::chrono::system_clock::to_time_t(now);
|
|
tm local_tm = *gmtime(&tt);
|
|
|
|
uint32_t tmM = (local_tm.tm_mon + 1);
|
|
uint32_t tmY = (local_tm.tm_year + 1900) - 2000;
|
|
|
|
#if DEBUG_P25_TSBK
|
|
LogDebug(LOG_P25, "TSBK_OSP_SYNC_BCAST, tmM = %u / %u, tmY = %u / %u", local_tm.tm_mon, tmM, local_tm.tm_year, tmY);
|
|
#endif
|
|
|
|
// determine LTO and direction (positive or negative)
|
|
bool negativeLTO = false;
|
|
uint8_t lto = fabs(m_siteData.lto()) * 2U; // this will cause a bug for half-hour timezone intervals...
|
|
if (m_siteData.lto() < 0)
|
|
negativeLTO = true;
|
|
|
|
// mark the LTO as valid if its non-zero
|
|
bool vl = false;
|
|
if (lto > 0U)
|
|
vl = true;
|
|
|
|
uint8_t mc = 0U;
|
|
|
|
// wrap microslot count if necessary
|
|
if (m_microslotCount > 7999U)
|
|
m_microslotCount = 0U;
|
|
|
|
tsbkValue = 0x0AU + // US - Unsynced Flag Set / MMU - Microslot/Minute Unlock Flag Set
|
|
((mc & 0x03U) >> 1); // Minute Correction MSB
|
|
tsbkValue = (tsbkValue << 8) +
|
|
((mc & 0x01U) << 7) + // Minute Correction LSB
|
|
(vl ? 0x40U : 0x00U) + // Valid LTO Flag
|
|
(negativeLTO ? 0x20U : 0x00U) + // Add/Subtract LTO Flag
|
|
(lto & 0x1F); // LTO
|
|
|
|
// Date
|
|
tsbkValue = (tsbkValue << 7) + (tmY & 0x7FU); // Number of Years Past 2000
|
|
tsbkValue = (tsbkValue << 4) + (tmM & 0x0FU); // Month
|
|
tsbkValue = (tsbkValue << 5) + (local_tm.tm_mday & 0x1FU); // Day of Month
|
|
|
|
// Time
|
|
tsbkValue = (tsbkValue << 5) + (local_tm.tm_hour & 0x1FU); // Hour
|
|
tsbkValue = (tsbkValue << 6) + (local_tm.tm_min & 0x3FU); // Minute
|
|
|
|
tsbkValue = (tsbkValue << 13) + (m_microslotCount & 0x1FFFU); // Microslot Count
|
|
|
|
std::unique_ptr<uint8_t[]> tsbk = TSBK::fromValue(tsbkValue);
|
|
TSBK::encode(data, tsbk.get(), rawTSBK, noTrellis);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Private Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
/// Internal helper to copy the the class.
|
|
/// </summary>
|
|
/// <param name="data"></param>
|
|
void OSP_SYNC_BCAST::copy(const OSP_SYNC_BCAST& data)
|
|
{
|
|
TSBK::copy(data);
|
|
|
|
m_microslotCount = data.m_microslotCount;
|
|
}
|