133 lines
5.3 KiB
C
133 lines
5.3 KiB
C
/*
|
|
* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
|
|
* Copyright (C) 2013 Armink <armink.ztl@gmail.com>
|
|
* 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.
|
|
*
|
|
* File: $Id: mbfuncinput_m.c,v 1.60 2013/10/12 14:23:40 Armink Add Master Functions Exp $
|
|
*/
|
|
|
|
/* ----------------------- System includes ----------------------------------*/
|
|
#include "stdlib.h"
|
|
#include "string.h"
|
|
|
|
/* ----------------------- Platform includes --------------------------------*/
|
|
#include "port.h"
|
|
|
|
/* ----------------------- Modbus includes ----------------------------------*/
|
|
#include "mb.h"
|
|
#include "mb_m.h"
|
|
#include "mbframe.h"
|
|
#include "mbproto.h"
|
|
#include "mbconfig.h"
|
|
|
|
/* ----------------------- Defines ------------------------------------------*/
|
|
#define MB_PDU_REQ_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
|
|
#define MB_PDU_REQ_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
|
|
#define MB_PDU_REQ_READ_SIZE ( 4 )
|
|
#define MB_PDU_FUNC_READ_BYTECNT_OFF ( MB_PDU_DATA_OFF + 0 )
|
|
#define MB_PDU_FUNC_READ_VALUES_OFF ( MB_PDU_DATA_OFF + 1 )
|
|
#define MB_PDU_FUNC_READ_SIZE_MIN ( 1 )
|
|
|
|
#define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF ( MB_PDU_DATA_OFF )
|
|
|
|
/* ----------------------- Static functions ---------------------------------*/
|
|
eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
|
|
|
|
/* ----------------------- Start implementation -----------------------------*/
|
|
#if MB_MASTER_RTU_ENABLED > 0 || MB_MASTER_ASCII_ENABLED > 0
|
|
#if MB_FUNC_READ_INPUT_ENABLED > 0
|
|
|
|
eMBMasterReqErrCode
|
|
eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs )
|
|
{
|
|
UCHAR *ucMBFrame;
|
|
eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR;
|
|
|
|
if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
|
|
else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
|
|
else
|
|
{
|
|
vMBMasterGetPDUSndBuf(&ucMBFrame);
|
|
vMBMasterSetDestAddress(ucSndAddr);
|
|
ucMBFrame[MB_PDU_FUNC_OFF] = MB_FUNC_READ_INPUT_REGISTER;
|
|
ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] = usRegAddr >> 8;
|
|
ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF + 1] = usRegAddr;
|
|
ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF] = usNRegs >> 8;
|
|
ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF + 1] = usNRegs;
|
|
vMBMasterSetPDUSndLength( MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE );
|
|
( void ) xMBMasterPortEventPost( EV_MASTER_FRAME_SENT );
|
|
}
|
|
return eErrStatus;
|
|
}
|
|
|
|
eMBException
|
|
eMBMasterFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen )
|
|
{
|
|
UCHAR *ucMBFrame;
|
|
USHORT usRegAddress;
|
|
USHORT usRegCount;
|
|
|
|
eMBException eStatus = MB_EX_NONE;
|
|
eMBErrorCode eRegStatus;
|
|
|
|
if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN)
|
|
{
|
|
vMBMasterGetPDUSndBuf(&ucMBFrame);
|
|
usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8 );
|
|
usRegAddress |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF + 1] );
|
|
usRegAddress++;
|
|
|
|
usRegCount = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF] << 8 );
|
|
usRegCount = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF + 1] );
|
|
|
|
/* Check if the number of registers to read is valid. If not
|
|
* return Modbus illegal data value exception.
|
|
*/
|
|
if( ( usRegCount >= 1 ) && ( 2 * usRegCount == pucFrame[MB_PDU_FUNC_READ_BYTECNT_OFF] ) )
|
|
{
|
|
/* Make callback to fill the buffer. */
|
|
eRegStatus = eMBRegInputCB( &pucFrame[MB_PDU_FUNC_READ_VALUES_OFF], usRegAddress, usRegCount );
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if( eRegStatus != MB_ENOERR )
|
|
{
|
|
eStatus = prveMBError2Exception( eRegStatus );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
eStatus = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Can't be a valid request because the length is incorrect. */
|
|
eStatus = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
return eStatus;
|
|
}
|
|
|
|
#endif
|
|
#endif
|