Wayne Lin / Modbus

modified for nuc472

Dependents:   modbus-over-rs485-sample NTOUEE-mbed-modbus-RTU NuMaker_NuWicam_Lite

Fork of Modbus by Matthew Waddilove

mbcrc.cpp@7:be466464a18c, 2017-10-06 (annotated)

Committer:
wclin
Date:
Fri Oct 06 02:54:27 2017 +0000
Revision:
7:be466464a18c
Parent:
0:274eb57e1df3 
Support M487 board.

Who changed what in which revision?

UserRevisionLine numberNew 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: mbcrc.c,v 1.7 2007/02/18 23:50:27 wolti Exp $
giryan 0:274eb57e1df3 29 */
giryan 0:274eb57e1df3 30
giryan 0:274eb57e1df3 31 /* ----------------------- Platform includes --------------------------------*/
giryan 0:274eb57e1df3 32 #include "port.h"
giryan 0:274eb57e1df3 33
giryan 0:274eb57e1df3 34 static const UCHAR aucCRCHi[] = {
giryan 0:274eb57e1df3 35 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 36 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
giryan 0:274eb57e1df3 37 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 38 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 39 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 40 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
giryan 0:274eb57e1df3 41 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
giryan 0:274eb57e1df3 42 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
giryan 0:274eb57e1df3 43 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 44 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
giryan 0:274eb57e1df3 45 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 46 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 47 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 48 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 49 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 50 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 51 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 52 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
giryan 0:274eb57e1df3 53 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 54 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 55 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
giryan 0:274eb57e1df3 56 0x00, 0xC1, 0x81, 0x40
giryan 0:274eb57e1df3 57 };
giryan 0:274eb57e1df3 58
giryan 0:274eb57e1df3 59 static const UCHAR aucCRCLo[] = {
giryan 0:274eb57e1df3 60 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
giryan 0:274eb57e1df3 61 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
giryan 0:274eb57e1df3 62 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
giryan 0:274eb57e1df3 63 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
giryan 0:274eb57e1df3 64 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
giryan 0:274eb57e1df3 65 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
giryan 0:274eb57e1df3 66 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
giryan 0:274eb57e1df3 67 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
giryan 0:274eb57e1df3 68 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
giryan 0:274eb57e1df3 69 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
giryan 0:274eb57e1df3 70 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
giryan 0:274eb57e1df3 71 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
giryan 0:274eb57e1df3 72 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
giryan 0:274eb57e1df3 73 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
giryan 0:274eb57e1df3 74 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
giryan 0:274eb57e1df3 75 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
giryan 0:274eb57e1df3 76 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
giryan 0:274eb57e1df3 77 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
giryan 0:274eb57e1df3 78 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
giryan 0:274eb57e1df3 79 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
giryan 0:274eb57e1df3 80 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
giryan 0:274eb57e1df3 81 0x41, 0x81, 0x80, 0x40
giryan 0:274eb57e1df3 82 };
giryan 0:274eb57e1df3 83
giryan 0:274eb57e1df3 84 USHORT
giryan 0:274eb57e1df3 85 usMBCRC16( UCHAR * pucFrame, USHORT usLen )
giryan 0:274eb57e1df3 86 {
giryan 0:274eb57e1df3 87 UCHAR ucCRCHi = 0xFF;
giryan 0:274eb57e1df3 88 UCHAR ucCRCLo = 0xFF;
giryan 0:274eb57e1df3 89 int iIndex;
giryan 0:274eb57e1df3 90
giryan 0:274eb57e1df3 91 while( usLen-- )
giryan 0:274eb57e1df3 92 {
giryan 0:274eb57e1df3 93 iIndex = ucCRCLo ^ *( pucFrame++ );
giryan 0:274eb57e1df3 94 ucCRCLo = ( UCHAR )( ucCRCHi ^ aucCRCHi[iIndex] );
giryan 0:274eb57e1df3 95 ucCRCHi = aucCRCLo[iIndex];
giryan 0:274eb57e1df3 96 }
giryan 0:274eb57e1df3 97 return ( USHORT )( ucCRCHi << 8 | ucCRCLo );
giryan 0:274eb57e1df3 98 }