MMDVMHost-Private/YSFEcho.cpp

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2016-01-14 18:45:04 +00:00
/*
* Copyright (C) 2015 by Jonathan Naylor G4KLX
*
* 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 "YSFEcho.h"
#include "YSFDefines.h"
CYSFEcho::CYSFEcho(unsigned int delay, unsigned int space) :
m_buffer(space),
m_timer(1000U, delay)
{
}
CYSFEcho::~CYSFEcho()
{
}
unsigned int CYSFEcho::readData(unsigned char* data)
{
if (!hasData())
return 0U;
unsigned char len;
m_buffer.getData(&len, 1U);
m_buffer.getData(data, len);
// If the FICH is valid, regenerate the sync
if ((data[1U] & 0x01U) == 0x01U) {
data[2U] = YSF_SYNC_BYTES[0U];
data[3U] = YSF_SYNC_BYTES[1U];
data[4U] = YSF_SYNC_BYTES[2U];
data[5U] = YSF_SYNC_BYTES[3U];
data[6U] = YSF_SYNC_BYTES[4U];
}
if (!hasData())
m_timer.stop();
return len;
}
bool CYSFEcho::writeData(const unsigned char* data, unsigned int length)
{
bool ret = m_buffer.hasSpace(length + 1U);
if (!ret)
return false;
unsigned char len = length;
m_buffer.addData(&len, 1U);
m_buffer.addData(data, length);
m_timer.start();
return true;
}
bool CYSFEcho::hasData()
{
if (m_timer.isRunning() && m_timer.hasExpired())
return m_buffer.hasData();
else
return false;
}
void CYSFEcho::clock(unsigned int ms)
{
m_timer.clock(ms);
}