309 lines
12 KiB
C
309 lines
12 KiB
C
/*
|
|
* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
|
|
* Copyright (c) 2006 Christian Walter <wolti@sil.at>
|
|
* 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: mbfuncholding.c,v 1.12 2007/02/18 23:48:22 wolti Exp $
|
|
*/
|
|
|
|
/* ----------------------- 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"
|
|
|
|
/* ----------------------- Defines ------------------------------------------*/
|
|
#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0)
|
|
#define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
|
|
#define MB_PDU_FUNC_READ_SIZE ( 4 )
|
|
#define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D )
|
|
|
|
#define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 0)
|
|
#define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 )
|
|
#define MB_PDU_FUNC_WRITE_SIZE ( 4 )
|
|
|
|
#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
|
|
#define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
|
|
#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 )
|
|
#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 )
|
|
#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN ( 5 )
|
|
#define MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ( 0x0078 )
|
|
|
|
#define MB_PDU_FUNC_READWRITE_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
|
|
#define MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
|
|
#define MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 4 )
|
|
#define MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF ( MB_PDU_DATA_OFF + 6 )
|
|
#define MB_PDU_FUNC_READWRITE_BYTECNT_OFF ( MB_PDU_DATA_OFF + 8 )
|
|
#define MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF ( MB_PDU_DATA_OFF + 9 )
|
|
#define MB_PDU_FUNC_READWRITE_SIZE_MIN ( 9 )
|
|
|
|
/* ----------------------- Static functions ---------------------------------*/
|
|
eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
|
|
|
|
/* ----------------------- Start implementation -----------------------------*/
|
|
|
|
#if MB_FUNC_WRITE_HOLDING_ENABLED > 0
|
|
|
|
eMBException
|
|
eMBFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
|
|
{
|
|
USHORT usRegAddress;
|
|
eMBException eStatus = MB_EX_NONE;
|
|
eMBErrorCode eRegStatus;
|
|
|
|
if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )
|
|
{
|
|
usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 );
|
|
usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] );
|
|
usRegAddress++;
|
|
|
|
/* Make callback to update the value. */
|
|
eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF],
|
|
usRegAddress, 1, MB_REG_WRITE );
|
|
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if( eRegStatus != MB_ENOERR )
|
|
{
|
|
eStatus = prveMBError2Exception( eRegStatus );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Can't be a valid request because the length is incorrect. */
|
|
eStatus = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
return eStatus;
|
|
}
|
|
#endif
|
|
|
|
#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0
|
|
eMBException
|
|
eMBFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
|
|
{
|
|
USHORT usRegAddress;
|
|
USHORT usRegCount;
|
|
UCHAR ucRegByteCount;
|
|
|
|
eMBException eStatus = MB_EX_NONE;
|
|
eMBErrorCode eRegStatus;
|
|
|
|
if( *usLen >= ( MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN ) )
|
|
{
|
|
usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 );
|
|
usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] );
|
|
usRegAddress++;
|
|
|
|
usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8 );
|
|
usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF + 1] );
|
|
|
|
ucRegByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];
|
|
|
|
if( ( usRegCount >= 1 ) &&
|
|
( usRegCount <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ) &&
|
|
( ucRegByteCount == ( UCHAR ) ( 2 * usRegCount ) ) )
|
|
{
|
|
/* Make callback to update the register values. */
|
|
eRegStatus =
|
|
eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF],
|
|
usRegAddress, usRegCount, MB_REG_WRITE );
|
|
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if( eRegStatus != MB_ENOERR )
|
|
{
|
|
eStatus = prveMBError2Exception( eRegStatus );
|
|
}
|
|
else
|
|
{
|
|
/* The response contains the function code, the starting
|
|
* address and the quantity of registers. We reuse the
|
|
* old values in the buffer because they are still valid.
|
|
*/
|
|
*usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;
|
|
}
|
|
}
|
|
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
|
|
|
|
#if MB_FUNC_READ_HOLDING_ENABLED > 0
|
|
|
|
eMBException
|
|
eMBFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
|
|
{
|
|
USHORT usRegAddress;
|
|
USHORT usRegCount;
|
|
UCHAR *pucFrameCur;
|
|
|
|
eMBException eStatus = MB_EX_NONE;
|
|
eMBErrorCode eRegStatus;
|
|
|
|
if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )
|
|
{
|
|
usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
|
|
usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
|
|
usRegAddress++;
|
|
|
|
usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );
|
|
usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_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 ) && ( usRegCount <= MB_PDU_FUNC_READ_REGCNT_MAX ) )
|
|
{
|
|
/* Set the current PDU data pointer to the beginning. */
|
|
pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
|
|
*usLen = MB_PDU_FUNC_OFF;
|
|
|
|
/* First byte contains the function code. */
|
|
*pucFrameCur++ = MB_FUNC_READ_HOLDING_REGISTER;
|
|
*usLen += 1;
|
|
|
|
/* Second byte in the response contain the number of bytes. */
|
|
*pucFrameCur++ = ( UCHAR ) ( usRegCount * 2 );
|
|
*usLen += 1;
|
|
|
|
/* Make callback to fill the buffer. */
|
|
eRegStatus = eMBRegHoldingCB( pucFrameCur, usRegAddress, usRegCount, MB_REG_READ );
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if( eRegStatus != MB_ENOERR )
|
|
{
|
|
eStatus = prveMBError2Exception( eRegStatus );
|
|
}
|
|
else
|
|
{
|
|
*usLen += usRegCount * 2;
|
|
}
|
|
}
|
|
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
|
|
|
|
#if MB_FUNC_READWRITE_HOLDING_ENABLED > 0
|
|
|
|
eMBException
|
|
eMBFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
|
|
{
|
|
USHORT usRegReadAddress;
|
|
USHORT usRegReadCount;
|
|
USHORT usRegWriteAddress;
|
|
USHORT usRegWriteCount;
|
|
UCHAR ucRegWriteByteCount;
|
|
UCHAR *pucFrameCur;
|
|
|
|
eMBException eStatus = MB_EX_NONE;
|
|
eMBErrorCode eRegStatus;
|
|
|
|
if( *usLen >= ( MB_PDU_FUNC_READWRITE_SIZE_MIN + MB_PDU_SIZE_MIN ) )
|
|
{
|
|
usRegReadAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF] << 8U );
|
|
usRegReadAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF + 1] );
|
|
usRegReadAddress++;
|
|
|
|
usRegReadCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF] << 8U );
|
|
usRegReadCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF + 1] );
|
|
|
|
usRegWriteAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF] << 8U );
|
|
usRegWriteAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF + 1] );
|
|
usRegWriteAddress++;
|
|
|
|
usRegWriteCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF] << 8U );
|
|
usRegWriteCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF + 1] );
|
|
|
|
ucRegWriteByteCount = pucFrame[MB_PDU_FUNC_READWRITE_BYTECNT_OFF];
|
|
|
|
if( ( usRegReadCount >= 1 ) && ( usRegReadCount <= 0x7D ) &&
|
|
( usRegWriteCount >= 1 ) && ( usRegWriteCount <= 0x79 ) &&
|
|
( ( 2 * usRegWriteCount ) == ucRegWriteByteCount ) )
|
|
{
|
|
/* Make callback to update the register values. */
|
|
eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF],
|
|
usRegWriteAddress, usRegWriteCount, MB_REG_WRITE );
|
|
|
|
if( eRegStatus == MB_ENOERR )
|
|
{
|
|
/* Set the current PDU data pointer to the beginning. */
|
|
pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
|
|
*usLen = MB_PDU_FUNC_OFF;
|
|
|
|
/* First byte contains the function code. */
|
|
*pucFrameCur++ = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;
|
|
*usLen += 1;
|
|
|
|
/* Second byte in the response contain the number of bytes. */
|
|
*pucFrameCur++ = ( UCHAR ) ( usRegReadCount * 2 );
|
|
*usLen += 1;
|
|
|
|
/* Make the read callback. */
|
|
eRegStatus =
|
|
eMBRegHoldingCB( pucFrameCur, usRegReadAddress, usRegReadCount, MB_REG_READ );
|
|
if( eRegStatus == MB_ENOERR )
|
|
{
|
|
*usLen += 2 * usRegReadCount;
|
|
}
|
|
}
|
|
if( eRegStatus != MB_ENOERR )
|
|
{
|
|
eStatus = prveMBError2Exception( eRegStatus );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
eStatus = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
}
|
|
return eStatus;
|
|
}
|
|
|
|
#endif
|