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102 lines
2.7 KiB
102 lines
2.7 KiB
/* |
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* FreeModbus Libary: NuttX Port |
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* Based on the FreeModbus Linux port by: |
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* |
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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 <sys/time.h> |
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#include <stdlib.h> |
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#include <assert.h> |
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#include "port.h" |
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/* ----------------------- Modbus includes ----------------------------------*/ |
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#include <apps/modbus/mb.h> |
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#include <apps/modbus/mbport.h> |
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/* ----------------------- Defines ------------------------------------------*/ |
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/* ----------------------- Static variables ---------------------------------*/ |
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uint32_t 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( uint16_t 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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uint32_t 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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