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Add BitsUtil
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BitsUtil/BitsUtil.c
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105
BitsUtil/BitsUtil.c
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/*
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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* Copyright (c) 2006-2018 Christian Walter <cwalter@embedded-solutions.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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*/
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/* ----------------------- System includes ----------------------------------*/
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#include "stdint.h"
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/* ----------------------- Defines ------------------------------------------*/
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#define BITS_UINT8 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 == 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);
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/* How many bits precede our bits to set. */
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usNPreBits = (uint16_t)(usBitOffset - usByteOffset * BITS_UINT8);
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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;
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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;
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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);
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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);
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/* How many bits precede our bits to set. */
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usNPreBits = (uint16_t)(usBitOffset - usByteOffset * BITS_UINT8);
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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;
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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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173
BitsUtil/README.md
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173
BitsUtil/README.md
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# 不对齐的比特赋值
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> 来自FreeModbus/mbtils.c 略微修改以便移植
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| 函数 | 功能 |
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| ---- | ---- |
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| xMBUtilSetBits | 设置比特 |
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| xMBUtilGetBits | 获取比特 |
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## xMBUtilSetBits
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``` C
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void xMBUtilSetBits( uint8_t * ucByteBuf, uint16_t usBitOffset, uint8_t ucNBits, uint8_t ucValue )
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```
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## xMBUtilGetBits
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``` C
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void xMBUtilGetBits( uint8_t * ucByteBuf, uint16_t usBitOffset, uint8_t ucNBits )
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```
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## Demo
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``` C
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eMBErrorCode
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eMBRegCoilsCB( uint8_t * pucRegBuffer, uint16_t usAddress, uint16_t usNCoils,
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eMBRegisterMode eMode )
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{
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eMBErrorCode eStatus = MB_ENOERR;
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uint16_t iNCoils = usNCoils;
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uint16_t usBitOffset;
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// Default usAddress + 1
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usAddress -= 1;
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usBitOffset = usAddress - REG_RELAYS_START;
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if( ( usAddress < REG_RELAYS_START ) || ( usAddress + usNCoils > REG_RELAYS_START + REG_RELAYS_SIZE ) )
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return MB_ENOREG;
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switch ( eMode )
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{
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// read
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case MB_REG_READ:
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while ( iNCoils > 0 )
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{
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*pucRegBuffer++ = xMBUtilGetBits(RelaysStatusBuf, usBitOffset, iNCoils > 8 ? 8 : iNCoils);
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iNCoils -= 8;
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usBitOffset += 8;
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}
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break;
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// write
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case MB_REG_WRITE:
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while ( iNCoils > 0 )
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{
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xMBUtilSetBits(RelaysStatusBuf, usBitOffset, iNCoils > 8 ? 8 : iNCoils, *pucRegBuffer++);
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iNCoils -= 8;
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usBitOffset += 8;
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}
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ReverseBits(RelaysStatusBuf[1]);
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// Set Relays New Status
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M1203_1_SetAllRelaysStatus(*(u16*)RelaysStatusBuf);
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break;
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}
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return eStatus;
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}
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```
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## Source
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``` C
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/*
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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* Copyright (c) 2006-2018 Christian Walter <cwalter@embedded-solutions.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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*/
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/* ----------------------- System includes ----------------------------------*/
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#include "stdint.h"
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/* ----------------------- Defines ------------------------------------------*/
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#define BITS_UINT8 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 == 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);
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/* How many bits precede our bits to set. */
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usNPreBits = (uint16_t)(usBitOffset - usByteOffset * BITS_UINT8);
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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;
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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;
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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);
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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);
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/* How many bits precede our bits to set. */
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usNPreBits = (uint16_t)(usBitOffset - usByteOffset * BITS_UINT8);
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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;
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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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```
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