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/*
* FreeModbus Libary: Linux Port
* Copyright (C) 2006 Christian Walter <wolti@sil.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* File: $Id: porttimer.c,v 1.1 2006/08/01 20:58:50 wolti Exp $
*/
/* ----------------------- Standard includes --------------------------------*/
#include <nuttx/config.h>
#include <stdlib.h>
#include <sys/time.h>
#include "port.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
/* ----------------------- Defines ------------------------------------------*/
/* ----------------------- Static variables ---------------------------------*/
ULONG ulTimeOut;
BOOL bTimeoutEnable;
static struct timeval xTimeLast;
/* ----------------------- Start implementation -----------------------------*/
BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )
{
ulTimeOut = usTim1Timerout50us / 20U;
if( ulTimeOut == 0 )
ulTimeOut = 1;
return xMBPortSerialSetTimeout( ulTimeOut );
}
void
xMBPortTimersClose( )
{
/* Does not use any hardware resources. */
}
void
vMBPortTimerPoll( )
{
ULONG ulDeltaMS;
struct timeval xTimeCur;
/* Timers are called from the serial layer because we have no high
* res timer in Win32. */
if( bTimeoutEnable )
{
if( gettimeofday( &xTimeCur, NULL ) != 0 )
{
/* gettimeofday failed - retry next time. */
}
else
{
ulDeltaMS = ( xTimeCur.tv_sec - xTimeLast.tv_sec ) * 1000L +
( xTimeCur.tv_usec - xTimeLast.tv_usec ) * 1000L;
if( ulDeltaMS > ulTimeOut )
{
bTimeoutEnable = FALSE;
( void )pxMBPortCBTimerExpired( );
}
}
}
}
void
vMBPortTimersEnable( )
{
int res = gettimeofday( &xTimeLast, NULL );
assert( res == 0 );
bTimeoutEnable = TRUE;
}
void
vMBPortTimersDisable( )
{
bTimeoutEnable = FALSE;
}
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