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