mbfuncother.c

modbus的例程,非常不错,大家可以

 /*
  * FreeRTOS Modbus Libary: A Modbus serial implementation for FreeRTOS
  * 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
  */

/* ----------------------- System includes ----------------------------------*/
#include "stdlib.h"
#include "string.h"

/* ----------------------- Platform includes --------------------------------*/
#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbframe.h"
#include "mbproto.h"
#include "mbconfig.h"

#if MB_FUNC_OTHER_REP_SLAVEID_ENABLED > 0

/* ----------------------- Static variables ---------------------------------*/
static UCHAR    ucMBSlaveID[MB_FUNC_OTHER_REP_SLAVEID_BUF];
static USHORT   usMBSlaveIDLen;

/* ----------------------- Start implementation -----------------------------*/

eMBErrorCode
eMBSetSlaveID( UCHAR ucSlaveID, BOOL xIsRunning,
               UCHAR const *pucAdditional, USHORT usAdditionalLen )
{
    eMBErrorCode    eStatus = MB_ENOERR;

    /* the first byte and second byte in the buffer is reserved for
     * the parameter ucSlaveID and the running flag. The rest of
     * the buffer is available for additional data. */
    if( usAdditionalLen + 2 < MB_FUNC_OTHER_REP_SLAVEID_BUF )
    {
        usMBSlaveIDLen = 0;
        ucMBSlaveID[usMBSlaveIDLen++] = ucSlaveID;
        ucMBSlaveID[usMBSlaveIDLen++] = ( UCHAR )( xIsRunning ? 0xFF : 0x00 );
        if( usAdditionalLen > 0 )
        {
            memcpy( &ucMBSlaveID[usMBSlaveIDLen], pucAdditional,
                    ( size_t )usAdditionalLen );
            usMBSlaveIDLen += usAdditionalLen;
        }
    }
    else
    {
        eStatus = MB_ENORES;
    }
    return eStatus;
}

eMBException
eMBFuncReportSlaveID( UCHAR * pucFrame, USHORT * usLen )
{
    memcpy( &pucFrame[MB_PDU_DATA_OFF], &ucMBSlaveID[0], ( size_t )usMBSlaveIDLen );
    *usLen = ( USHORT )( MB_PDU_DATA_OFF + usMBSlaveIDLen );
    return MB_EX_NONE;
}

#endif