sw k
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Modbus
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Fork of Modbus by
mbutils.cpp@1:a6730b74f48b, 2016-12-01 (annotated)
- Committer:
- swk
- Date:
- Thu Dec 01 00:56:19 2016 +0000
- Revision:
- 1:a6730b74f48b
- Parent:
- 0:274eb57e1df3
dd
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
giryan | 0:274eb57e1df3 | 1 | /* |
giryan | 0:274eb57e1df3 | 2 | * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. |
giryan | 0:274eb57e1df3 | 3 | * Copyright (c) 2006 Christian Walter <wolti@sil.at> |
giryan | 0:274eb57e1df3 | 4 | * All rights reserved. |
giryan | 0:274eb57e1df3 | 5 | * |
giryan | 0:274eb57e1df3 | 6 | * Redistribution and use in source and binary forms, with or without |
giryan | 0:274eb57e1df3 | 7 | * modification, are permitted provided that the following conditions |
giryan | 0:274eb57e1df3 | 8 | * are met: |
giryan | 0:274eb57e1df3 | 9 | * 1. Redistributions of source code must retain the above copyright |
giryan | 0:274eb57e1df3 | 10 | * notice, this list of conditions and the following disclaimer. |
giryan | 0:274eb57e1df3 | 11 | * 2. Redistributions in binary form must reproduce the above copyright |
giryan | 0:274eb57e1df3 | 12 | * notice, this list of conditions and the following disclaimer in the |
giryan | 0:274eb57e1df3 | 13 | * documentation and/or other materials provided with the distribution. |
giryan | 0:274eb57e1df3 | 14 | * 3. The name of the author may not be used to endorse or promote products |
giryan | 0:274eb57e1df3 | 15 | * derived from this software without specific prior written permission. |
giryan | 0:274eb57e1df3 | 16 | * |
giryan | 0:274eb57e1df3 | 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
giryan | 0:274eb57e1df3 | 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
giryan | 0:274eb57e1df3 | 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
giryan | 0:274eb57e1df3 | 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
giryan | 0:274eb57e1df3 | 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
giryan | 0:274eb57e1df3 | 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
giryan | 0:274eb57e1df3 | 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
giryan | 0:274eb57e1df3 | 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
giryan | 0:274eb57e1df3 | 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
giryan | 0:274eb57e1df3 | 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
giryan | 0:274eb57e1df3 | 27 | * |
giryan | 0:274eb57e1df3 | 28 | * File: $Id: mbutils.c,v 1.6 2007/02/18 23:49:07 wolti Exp $ |
giryan | 0:274eb57e1df3 | 29 | */ |
giryan | 0:274eb57e1df3 | 30 | |
giryan | 0:274eb57e1df3 | 31 | /* ----------------------- System includes ----------------------------------*/ |
giryan | 0:274eb57e1df3 | 32 | #include "stdlib.h" |
giryan | 0:274eb57e1df3 | 33 | #include "string.h" |
giryan | 0:274eb57e1df3 | 34 | |
giryan | 0:274eb57e1df3 | 35 | /* ----------------------- Platform includes --------------------------------*/ |
giryan | 0:274eb57e1df3 | 36 | #include "port.h" |
giryan | 0:274eb57e1df3 | 37 | |
giryan | 0:274eb57e1df3 | 38 | /* ----------------------- Modbus includes ----------------------------------*/ |
giryan | 0:274eb57e1df3 | 39 | #include "mb.h" |
giryan | 0:274eb57e1df3 | 40 | #include "mbproto.h" |
giryan | 0:274eb57e1df3 | 41 | |
giryan | 0:274eb57e1df3 | 42 | /* ----------------------- Defines ------------------------------------------*/ |
giryan | 0:274eb57e1df3 | 43 | #define BITS_UCHAR 8U |
giryan | 0:274eb57e1df3 | 44 | |
giryan | 0:274eb57e1df3 | 45 | /* ----------------------- Start implementation -----------------------------*/ |
giryan | 0:274eb57e1df3 | 46 | void |
giryan | 0:274eb57e1df3 | 47 | xMBUtilSetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits, |
giryan | 0:274eb57e1df3 | 48 | UCHAR ucValue ) |
giryan | 0:274eb57e1df3 | 49 | { |
giryan | 0:274eb57e1df3 | 50 | USHORT usWordBuf; |
giryan | 0:274eb57e1df3 | 51 | USHORT usMask; |
giryan | 0:274eb57e1df3 | 52 | USHORT usByteOffset; |
giryan | 0:274eb57e1df3 | 53 | USHORT usNPreBits; |
giryan | 0:274eb57e1df3 | 54 | USHORT usValue = ucValue; |
giryan | 0:274eb57e1df3 | 55 | |
giryan | 0:274eb57e1df3 | 56 | assert( ucNBits <= 8 ); |
giryan | 0:274eb57e1df3 | 57 | assert( ( size_t )BITS_UCHAR == sizeof( UCHAR ) * 8 ); |
giryan | 0:274eb57e1df3 | 58 | |
giryan | 0:274eb57e1df3 | 59 | /* Calculate byte offset for first byte containing the bit values starting |
giryan | 0:274eb57e1df3 | 60 | * at usBitOffset. */ |
giryan | 0:274eb57e1df3 | 61 | usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR ); |
giryan | 0:274eb57e1df3 | 62 | |
giryan | 0:274eb57e1df3 | 63 | /* How many bits precede our bits to set. */ |
giryan | 0:274eb57e1df3 | 64 | usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR ); |
giryan | 0:274eb57e1df3 | 65 | |
giryan | 0:274eb57e1df3 | 66 | /* Move bit field into position over bits to set */ |
giryan | 0:274eb57e1df3 | 67 | usValue <<= usNPreBits; |
giryan | 0:274eb57e1df3 | 68 | |
giryan | 0:274eb57e1df3 | 69 | /* Prepare a mask for setting the new bits. */ |
giryan | 0:274eb57e1df3 | 70 | usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 ); |
giryan | 0:274eb57e1df3 | 71 | usMask <<= usBitOffset - usByteOffset * BITS_UCHAR; |
giryan | 0:274eb57e1df3 | 72 | |
giryan | 0:274eb57e1df3 | 73 | /* copy bits into temporary storage. */ |
giryan | 0:274eb57e1df3 | 74 | usWordBuf = ucByteBuf[usByteOffset]; |
giryan | 0:274eb57e1df3 | 75 | usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR; |
giryan | 0:274eb57e1df3 | 76 | |
giryan | 0:274eb57e1df3 | 77 | /* Zero out bit field bits and then or value bits into them. */ |
giryan | 0:274eb57e1df3 | 78 | usWordBuf = ( USHORT )( ( usWordBuf & ( ~usMask ) ) | usValue ); |
giryan | 0:274eb57e1df3 | 79 | |
giryan | 0:274eb57e1df3 | 80 | /* move bits back into storage */ |
giryan | 0:274eb57e1df3 | 81 | ucByteBuf[usByteOffset] = ( UCHAR )( usWordBuf & 0xFF ); |
giryan | 0:274eb57e1df3 | 82 | ucByteBuf[usByteOffset + 1] = ( UCHAR )( usWordBuf >> BITS_UCHAR ); |
giryan | 0:274eb57e1df3 | 83 | } |
giryan | 0:274eb57e1df3 | 84 | |
giryan | 0:274eb57e1df3 | 85 | UCHAR |
giryan | 0:274eb57e1df3 | 86 | xMBUtilGetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits ) |
giryan | 0:274eb57e1df3 | 87 | { |
giryan | 0:274eb57e1df3 | 88 | USHORT usWordBuf; |
giryan | 0:274eb57e1df3 | 89 | USHORT usMask; |
giryan | 0:274eb57e1df3 | 90 | USHORT usByteOffset; |
giryan | 0:274eb57e1df3 | 91 | USHORT usNPreBits; |
giryan | 0:274eb57e1df3 | 92 | |
giryan | 0:274eb57e1df3 | 93 | /* Calculate byte offset for first byte containing the bit values starting |
giryan | 0:274eb57e1df3 | 94 | * at usBitOffset. */ |
giryan | 0:274eb57e1df3 | 95 | usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR ); |
giryan | 0:274eb57e1df3 | 96 | |
giryan | 0:274eb57e1df3 | 97 | /* How many bits precede our bits to set. */ |
giryan | 0:274eb57e1df3 | 98 | usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR ); |
giryan | 0:274eb57e1df3 | 99 | |
giryan | 0:274eb57e1df3 | 100 | /* Prepare a mask for setting the new bits. */ |
giryan | 0:274eb57e1df3 | 101 | usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 ); |
giryan | 0:274eb57e1df3 | 102 | |
giryan | 0:274eb57e1df3 | 103 | /* copy bits into temporary storage. */ |
giryan | 0:274eb57e1df3 | 104 | usWordBuf = ucByteBuf[usByteOffset]; |
giryan | 0:274eb57e1df3 | 105 | usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR; |
giryan | 0:274eb57e1df3 | 106 | |
giryan | 0:274eb57e1df3 | 107 | /* throw away unneeded bits. */ |
giryan | 0:274eb57e1df3 | 108 | usWordBuf >>= usNPreBits; |
giryan | 0:274eb57e1df3 | 109 | |
giryan | 0:274eb57e1df3 | 110 | /* mask away bits above the requested bitfield. */ |
giryan | 0:274eb57e1df3 | 111 | usWordBuf &= usMask; |
giryan | 0:274eb57e1df3 | 112 | |
giryan | 0:274eb57e1df3 | 113 | return ( UCHAR ) usWordBuf; |
giryan | 0:274eb57e1df3 | 114 | } |
giryan | 0:274eb57e1df3 | 115 | |
giryan | 0:274eb57e1df3 | 116 | eMBException |
giryan | 0:274eb57e1df3 | 117 | prveMBError2Exception( eMBErrorCode eErrorCode ) |
giryan | 0:274eb57e1df3 | 118 | { |
giryan | 0:274eb57e1df3 | 119 | eMBException eStatus; |
giryan | 0:274eb57e1df3 | 120 | |
giryan | 0:274eb57e1df3 | 121 | switch ( eErrorCode ) |
giryan | 0:274eb57e1df3 | 122 | { |
giryan | 0:274eb57e1df3 | 123 | case MB_ENOERR: |
giryan | 0:274eb57e1df3 | 124 | eStatus = MB_EX_NONE; |
giryan | 0:274eb57e1df3 | 125 | break; |
giryan | 0:274eb57e1df3 | 126 | |
giryan | 0:274eb57e1df3 | 127 | case MB_ENOREG: |
giryan | 0:274eb57e1df3 | 128 | eStatus = MB_EX_ILLEGAL_DATA_ADDRESS; |
giryan | 0:274eb57e1df3 | 129 | break; |
giryan | 0:274eb57e1df3 | 130 | |
giryan | 0:274eb57e1df3 | 131 | case MB_ETIMEDOUT: |
giryan | 0:274eb57e1df3 | 132 | eStatus = MB_EX_SLAVE_BUSY; |
giryan | 0:274eb57e1df3 | 133 | break; |
giryan | 0:274eb57e1df3 | 134 | |
giryan | 0:274eb57e1df3 | 135 | default: |
giryan | 0:274eb57e1df3 | 136 | eStatus = MB_EX_SLAVE_DEVICE_FAILURE; |
giryan | 0:274eb57e1df3 | 137 | break; |
giryan | 0:274eb57e1df3 | 138 | } |
giryan | 0:274eb57e1df3 | 139 | |
giryan | 0:274eb57e1df3 | 140 | return eStatus; |
giryan | 0:274eb57e1df3 | 141 | } |