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143 lines
5.0 KiB
143 lines
5.0 KiB
/* |
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. |
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* Copyright (c) 2006 Christian Walter <wolti@sil.at> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* File: $Id: mbutils.c,v 1.6 2007/02/18 23:49:07 wolti Exp $ |
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*/ |
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/* ----------------------- System includes ----------------------------------*/ |
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#include <nuttx/config.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <assert.h> |
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/* ----------------------- Platform includes --------------------------------*/ |
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#include "port.h" |
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/* ----------------------- Modbus includes ----------------------------------*/ |
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#include <apps/modbus/mb.h> |
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#include <apps/modbus/mbproto.h> |
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/* ----------------------- Defines ------------------------------------------*/ |
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#define BITS_uint8_t 8U |
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/* ----------------------- Start implementation -----------------------------*/ |
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void |
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xMBUtilSetBits( uint8_t * ucByteBuf, uint16_t usBitOffset, uint8_t ucNBits, |
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uint8_t ucValue ) |
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{ |
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uint16_t usWordBuf; |
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uint16_t usMask; |
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uint16_t usByteOffset; |
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uint16_t usNPreBits; |
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uint16_t usValue = ucValue; |
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ASSERT( ucNBits <= 8 ); |
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ASSERT( ( size_t )BITS_uint8_t == sizeof( uint8_t ) * 8 ); |
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/* Calculate byte offset for first byte containing the bit values starting |
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* at usBitOffset. */ |
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usByteOffset = ( uint16_t )( ( usBitOffset ) / BITS_uint8_t ); |
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/* How many bits precede our bits to set. */ |
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usNPreBits = ( uint16_t )( usBitOffset - usByteOffset * BITS_uint8_t ); |
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/* Move bit field into position over bits to set */ |
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usValue <<= usNPreBits; |
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/* Prepare a mask for setting the new bits. */ |
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usMask = ( uint16_t )( ( 1 << ( uint16_t ) ucNBits ) - 1 ); |
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usMask <<= usBitOffset - usByteOffset * BITS_uint8_t; |
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/* copy bits into temporary storage. */ |
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usWordBuf = ucByteBuf[usByteOffset]; |
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usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_uint8_t; |
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/* Zero out bit field bits and then or value bits into them. */ |
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usWordBuf = ( uint16_t )( ( usWordBuf & ( ~usMask ) ) | usValue ); |
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/* move bits back into storage */ |
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ucByteBuf[usByteOffset] = ( uint8_t )( usWordBuf & 0xFF ); |
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ucByteBuf[usByteOffset + 1] = ( uint8_t )( usWordBuf >> BITS_uint8_t ); |
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} |
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uint8_t |
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xMBUtilGetBits( uint8_t * ucByteBuf, uint16_t usBitOffset, uint8_t ucNBits ) |
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{ |
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uint16_t usWordBuf; |
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uint16_t usMask; |
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uint16_t usByteOffset; |
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uint16_t usNPreBits; |
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/* Calculate byte offset for first byte containing the bit values starting |
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* at usBitOffset. */ |
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usByteOffset = ( uint16_t )( ( usBitOffset ) / BITS_uint8_t ); |
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/* How many bits precede our bits to set. */ |
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usNPreBits = ( uint16_t )( usBitOffset - usByteOffset * BITS_uint8_t ); |
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/* Prepare a mask for setting the new bits. */ |
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usMask = ( uint16_t )( ( 1 << ( uint16_t ) ucNBits ) - 1 ); |
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/* copy bits into temporary storage. */ |
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usWordBuf = ucByteBuf[usByteOffset]; |
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usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_uint8_t; |
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/* throw away unneeded bits. */ |
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usWordBuf >>= usNPreBits; |
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/* mask away bits above the requested bitfield. */ |
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usWordBuf &= usMask; |
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return ( uint8_t ) usWordBuf; |
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} |
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eMBException |
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prveMBError2Exception( eMBErrorCode eErrorCode ) |
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{ |
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eMBException eStatus; |
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switch ( eErrorCode ) |
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{ |
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case MB_ENOERR: |
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eStatus = MB_EX_NONE; |
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break; |
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case MB_ENOREG: |
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eStatus = MB_EX_ILLEGAL_DATA_ADDRESS; |
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break; |
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case MB_ETIMEDOUT: |
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eStatus = MB_EX_SLAVE_BUSY; |
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break; |
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default: |
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eStatus = MB_EX_SLAVE_DEVICE_FAILURE; |
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break; |
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} |
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return eStatus; |
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}
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