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/****************************************************************************
* apps/modbus/nuttx/porttimer.c
*
* FreeModbus Libary: NuttX Port
* Copyright (c) 2006 Christian Walter <wolti@sil.at>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/time.h>
#include <stdlib.h>
#include <assert.h>
#include "port.h"
#include <apps/modbus/mb.h>
#include <apps/modbus/mbport.h>
/****************************************************************************
* Public Data
****************************************************************************/
uint32_t ulTimeOut;
bool bTimeoutEnable;
static struct timeval xTimeLast;
/****************************************************************************
* Public Functions
****************************************************************************/
bool xMBPortTimersInit(uint16_t usTim1Timerout50us)
{
ulTimeOut = usTim1Timerout50us / 20U;
if (ulTimeOut == 0)
{
ulTimeOut = 1;
}
return xMBPortSerialSetTimeout(ulTimeOut);
}
void xMBPortTimersClose()
{
/* Does not use any hardware resources. */
}
void vMBPortTimerPoll()
{
uint32_t 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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