142 lines
4.9 KiB
C
142 lines
4.9 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: mbutils.c,v 1.6 2007/02/18 23:49:07 wolti Exp $
|
|
*/
|
|
|
|
/* ----------------------- System includes ----------------------------------*/
|
|
#include "stdlib.h"
|
|
#include "string.h"
|
|
|
|
/* ----------------------- Platform includes --------------------------------*/
|
|
#include "port.h"
|
|
|
|
/* ----------------------- Modbus includes ----------------------------------*/
|
|
#include "mb.h"
|
|
#include "mbproto.h"
|
|
|
|
/* ----------------------- Defines ------------------------------------------*/
|
|
#define BITS_UCHAR 8U
|
|
|
|
/* ----------------------- Start implementation -----------------------------*/
|
|
void
|
|
xMBUtilSetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits,
|
|
UCHAR ucValue )
|
|
{
|
|
USHORT usWordBuf;
|
|
USHORT usMask;
|
|
USHORT usByteOffset;
|
|
USHORT usNPreBits;
|
|
USHORT usValue = ucValue;
|
|
|
|
assert_param( ucNBits <= 8 );
|
|
assert_param( ( size_t )BITS_UCHAR == sizeof( UCHAR ) * 8 );
|
|
|
|
/* Calculate byte offset for first byte containing the bit values starting
|
|
* at usBitOffset. */
|
|
usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR );
|
|
|
|
/* How many bits precede our bits to set. */
|
|
usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR );
|
|
|
|
/* Move bit field into position over bits to set */
|
|
usValue <<= usNPreBits;
|
|
|
|
/* Prepare a mask for setting the new bits. */
|
|
usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 );
|
|
usMask <<= usBitOffset - usByteOffset * BITS_UCHAR;
|
|
|
|
/* copy bits into temporary storage. */
|
|
usWordBuf = ucByteBuf[usByteOffset];
|
|
usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR;
|
|
|
|
/* Zero out bit field bits and then or value bits into them. */
|
|
usWordBuf = ( USHORT )( ( usWordBuf & ( ~usMask ) ) | usValue );
|
|
|
|
/* move bits back into storage */
|
|
ucByteBuf[usByteOffset] = ( UCHAR )( usWordBuf & 0xFF );
|
|
ucByteBuf[usByteOffset + 1] = ( UCHAR )( usWordBuf >> BITS_UCHAR );
|
|
}
|
|
|
|
UCHAR
|
|
xMBUtilGetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits )
|
|
{
|
|
USHORT usWordBuf;
|
|
USHORT usMask;
|
|
USHORT usByteOffset;
|
|
USHORT usNPreBits;
|
|
|
|
/* Calculate byte offset for first byte containing the bit values starting
|
|
* at usBitOffset. */
|
|
usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR );
|
|
|
|
/* How many bits precede our bits to set. */
|
|
usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR );
|
|
|
|
/* Prepare a mask for setting the new bits. */
|
|
usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 );
|
|
|
|
/* copy bits into temporary storage. */
|
|
usWordBuf = ucByteBuf[usByteOffset];
|
|
usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR;
|
|
|
|
/* throw away unneeded bits. */
|
|
usWordBuf >>= usNPreBits;
|
|
|
|
/* mask away bits above the requested bitfield. */
|
|
usWordBuf &= usMask;
|
|
|
|
return ( UCHAR ) usWordBuf;
|
|
}
|
|
|
|
eMBException
|
|
prveMBError2Exception( eMBErrorCode eErrorCode )
|
|
{
|
|
eMBException eStatus;
|
|
|
|
switch ( eErrorCode )
|
|
{
|
|
case MB_ENOERR:
|
|
eStatus = MB_EX_NONE;
|
|
break;
|
|
|
|
case MB_ENOREG:
|
|
eStatus = MB_EX_ILLEGAL_DATA_ADDRESS;
|
|
break;
|
|
|
|
case MB_ETIMEDOUT:
|
|
eStatus = MB_EX_SLAVE_BUSY;
|
|
break;
|
|
|
|
default:
|
|
eStatus = MB_EX_SLAVE_DEVICE_FAILURE;
|
|
break;
|
|
}
|
|
|
|
return eStatus;
|
|
}
|