portevent.c

freemodbus-v1-1-1-0.zip v1.1.1版本的代码 支持多个平台

/*
 * FreeModbus Libary: Win32 Port
 * Copyright (C) 2006 Christian Walter <[e-mail]>
 *
 * 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: portevent.c,v 1.2 2006/06/26 17:57:10 wolti Exp $
 */

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"

/* ----------------------- Variables ----------------------------------------*/
static eMBEventType eQueuedEvent;
static BOOL     xEventInQueue;

/* ----------------------- Start implementation -----------------------------*/
BOOL
xMBPortEventInit( void )
{
    xEventInQueue = FALSE;
    return TRUE;
}

BOOL
xMBPortEventPost( eMBEventType eEvent )
{
    xEventInQueue = TRUE;
    eQueuedEvent = eEvent;
    return TRUE;
}

BOOL
xMBPortEventGet( eMBEventType * eEvent )
{
    BOOL            xEventHappened = FALSE;

    if( xEventInQueue )
    {
        *eEvent = eQueuedEvent;
        xEventInQueue = FALSE;
        xEventHappened = TRUE;
    }
    else
    {        
        /* Poll the serial device. The serial device timeouts if no
         * characters have been received within for t3.5 during an
         * active transmission or if nothing happens within a specified
         * amount of time. Both timeouts are configured from the timer
         * init functions.
         */
        ( void )xMBPortSerialPoll(  );  

        /* Check if any of the timers have expired. */
        vMBPortTimerPoll(  );
     
    }
    return xEventHappened;
}