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/****************************************************************************
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* F i l e D a t a
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* $Id: CRC.c,v 1.6 2004/03/16 10:18:28 nagni Exp $
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* $Revision: 1.6 $
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* $Date: 2004/03/16 10:18:28 $
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* $RCSfile: CRC.c,v $
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*
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****************************************************************************
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* S W D e v e l o p m e n t E n v i r o n m e n t
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*
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* $Author: nagni $
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* :
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****************************************************************************
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* U p d a t i n g
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*****************************************************************************/
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/*============================= Include File ================================*/
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#include "CRC.h"
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/*============================ Global define ================================*/
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/*============================== global types ==============================*/
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/*****************************************************************************/
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/*=========================== Structure define ==============================*/
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/*****************************************************************************/
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/*============================ Enumerate define =============================*/
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/*****************************************************************************/
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/*=== Common I N T E R N A L ==*/
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/*****************************************************************************/
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/*************************************************************************/
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/* @Constant: Ccrc_lookup */
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/* @Purpose : */
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/* CRC-TABLE CRCINIT=0x0000 POLY=0x1021 CCITT V.41 */
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/* */
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/* @@ */
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/*************************************************************************/
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static const unsigned int Crc_lookup[256] = {
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0x0000,0x1021,0x2042,0x3063,0x4084,0x50A5,0x60C6,0x70E7,
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0x8108,0x9129,0xA14A,0xB16B,0xC18C,0xD1AD,0xE1CE,0xF1EF,
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0x1231,0x0210,0x3273,0x2252,0x52B5,0x4294,0x72F7,0x62D6,
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0x9339,0x8318,0xB37B,0xA35A,0xD3BD,0xC39C,0xF3FF,0xE3DE,
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0x2462,0x3443,0x0420,0x1401,0x64E6,0x74C7,0x44A4,0x5485,
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0xA56A,0xB54B,0x8528,0x9509,0xE5EE,0xF5CF,0xC5AC,0xD58D,
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0x3653,0x2672,0x1611,0x0630,0x76D7,0x66F6,0x5695,0x46B4,
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0xB75B,0xA77A,0x9719,0x8738,0xF7DF,0xE7FE,0xD79D,0xC7BC,
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0x48C4,0x58E5,0x6886,0x78A7,0x0840,0x1861,0x2802,0x3823,
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0xC9CC,0xD9ED,0xE98E,0xF9AF,0x8948,0x9969,0xA90A,0xB92B,
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0x5AF5,0x4AD4,0x7AB7,0x6A96,0x1A71,0x0A50,0x3A33,0x2A12,
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0xDBFD,0xCBDC,0xFBBF,0xEB9E,0x9B79,0x8B58,0xBB3B,0xAB1A,
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0x6CA6,0x7C87,0x4CE4,0x5CC5,0x2C22,0x3C03,0x0C60,0x1C41,
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0xEDAE,0xFD8F,0xCDEC,0xDDCD,0xAD2A,0xBD0B,0x8D68,0x9D49,
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0x7E97,0x6EB6,0x5ED5,0x4EF4,0x3E13,0x2E32,0x1E51,0x0E70,
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0xFF9F,0xEFBE,0xDFDD,0xCFFC,0xBF1B,0xAF3A,0x9F59,0x8F78,
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0x9188,0x81A9,0xB1CA,0xA1EB,0xD10C,0xC12D,0xF14E,0xE16F,
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0x1080,0x00A1,0x30C2,0x20E3,0x5004,0x4025,0x7046,0x6067,
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0x83B9,0x9398,0xA3FB,0xB3DA,0xC33D,0xD31C,0xE37F,0xF35E,
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0x02B1,0x1290,0x22F3,0x32D2,0x4235,0x5214,0x6277,0x7256,
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0xB5EA,0xA5CB,0x95A8,0x8589,0xF56E,0xE54F,0xD52C,0xC50D,
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0x34E2,0x24C3,0x14A0,0x0481,0x7466,0x6447,0x5424,0x4405,
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0xA7DB,0xB7FA,0x8799,0x97B8,0xE75F,0xF77E,0xC71D,0xD73C,
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0x26D3,0x36F2,0x0691,0x16B0,0x6657,0x7676,0x4615,0x5634,
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0xD94C,0xC96D,0xF90E,0xE92F,0x99C8,0x89E9,0xB98A,0xA9AB,
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0x5844,0x4865,0x7806,0x6827,0x18C0,0x08E1,0x3882,0x28A3,
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0xCB7D,0xDB5C,0xEB3F,0xFB1E,0x8BF9,0x9BD8,0xABBB,0xBB9A,
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0x4A75,0x5A54,0x6A37,0x7A16,0x0AF1,0x1AD0,0x2AB3,0x3A92,
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0xFD2E,0xED0F,0xDD6C,0xCD4D,0xBDAA,0xAD8B,0x9DE8,0x8DC9,
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0x7C26,0x6C07,0x5C64,0x4C45,0x3CA2,0x2C83,0x1CE0,0x0CC1,
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0xEF1F,0xFF3E,0xCF5D,0xDF7C,0xAF9B,0xBFBA,0x8FD9,0x9FF8,
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0x6E17,0x7E36,0x4E55,0x5E74,0x2E93,0x3EB2,0x0ED1,0x1EF0
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};
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/*****************************************************************************/
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/*
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* TRK_crc8_8
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*
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* calculate single 8 bit crc
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*
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* Input parameters:
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* old = old value
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* data = new value
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* outcrc = pointer to calculated crc
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*
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* Output parameters: status_code
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*
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*/
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/*****************************************************************************/
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typedef union {
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BYTE word;
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//#ifdef ERC32
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/* ERC 32 arch is BIG endian */
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/* struct bit_field_w
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{
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unsigned b7:1;
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unsigned b6:1;
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unsigned b5:1;
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unsigned b4:1;
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unsigned b3:1;
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unsigned b2:1;
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unsigned b1:1;
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unsigned b0:1;
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} bit;
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#else*/
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/* IA32 arch is LITTLE endian */
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struct bit_field_w
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{
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unsigned b0:1;
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unsigned b1:1;
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unsigned b2:1;
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unsigned b3:1;
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unsigned b4:1;
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unsigned b5:1;
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unsigned b6:1;
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unsigned b7:1;
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} bit;
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//#endif
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} CM_crc8_8_word ;
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#define CM_CRC8_8(old,data,crc,c,d,r) do { \
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c.word = (old); \
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d.word = (data); \
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r.bit.b0 = c.bit.b0 ^ c.bit.b6 ^ c.bit.b7 ^ d.bit.b0 ^ d.bit.b6 ^ d.bit.b7; \
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r.bit.b1 = c.bit.b0 ^ c.bit.b1 ^ c.bit.b6 ^ d.bit.b0 ^ d.bit.b1 ^ d.bit.b6; \
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r.bit.b2 = c.bit.b0 ^ c.bit.b1 ^ c.bit.b2 ^ c.bit.b6 ^ d.bit.b0 ^ d.bit.b1 ^d.bit.b2 ^ d.bit.b6; \
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r.bit.b3 = c.bit.b1 ^ c.bit.b2 ^ c.bit.b3 ^ c.bit.b7 ^ d.bit.b1 ^ d.bit.b2 ^d.bit.b3 ^ d.bit.b7; \
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r.bit.b4 = c.bit.b2 ^ c.bit.b3 ^ c.bit.b4 ^ d.bit.b2 ^ d.bit.b3 ^ d.bit.b4; \
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r.bit.b5 = c.bit.b3 ^ c.bit.b4 ^ c.bit.b5 ^ d.bit.b3 ^ d.bit.b4 ^ d.bit.b5; \
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r.bit.b6 = c.bit.b4 ^ c.bit.b5 ^ c.bit.b6 ^ d.bit.b4 ^ d.bit.b5 ^ d.bit.b6; \
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r.bit.b7 = c.bit.b5 ^ c.bit.b6 ^ c.bit.b7 ^ d.bit.b5 ^ d.bit.b6 ^ d.bit.b7; \
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crc = r.word; \
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} while(0)
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BYTE CM_crc8_8(BYTE old,BYTE data) {
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CM_crc8_8_word c,d,r;
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BYTE Crc;
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CM_CRC8_8(old,data,Crc,c,d,r);
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return Crc;
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}
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/**
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Compute a 8 CRC based over a \a buffer data of length \a length, whith a starting crc of \a oldcrc
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and returns the 32 bit crc on the whole buffer
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*/
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UINT32 CM_Compute_CRC8_8(UINT32 oldcrc /** the starting CRC value. changing this value also change the returning value. usually 0. */
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,BYTE *buffer /** the starting pointer to start crc computing */
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,UINT32 length /** the length in byte of the buffer */
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)
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{
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int i;
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BYTE tmpcrc,crc = oldcrc;
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CM_crc8_8_word c,d,r;
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for (i=0; i < (int)length; i++) {
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tmpcrc=crc;
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CM_CRC8_8(tmpcrc,*buffer,crc,c,d,r);
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buffer++;
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}
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return crc;
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}
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/*****************************************************************************/
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/* @Function: CM_Crc16 */
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/* @Purpose : */
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/* This function calculates the CRC. */
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/* */
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/* @@ */
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/* @Parameter Name @Mode @Description */
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/* @@ */
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/*****************************************************************************/
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/* adrs_ptr: is BYTE*
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* crc : is UINT16
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*/
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#define CM_MACRO_CRC16(Crc16,adrs_ptr) do { \
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Crc16 = \
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(UINT32)(Crc16 << 8) ^ \
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(UINT32)(Crc_lookup[ (UINT32) ( ((Crc16 >> 8) & 0xFF) ^ *adrs_ptr) ]); \
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} while(0)
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UINT16 CM_CRC16(BYTE* adrs, UINT16 Crc)
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{
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UINT32 Crc16Value=Crc;
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// Calculating the CRC16 by using a LookUp table
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CM_MACRO_CRC16(Crc16Value,adrs);
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return ((UINT16)Crc16Value);
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}
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UINT16 CM_Compute_CRC16(UINT16 oldcrc,BYTE *buffer,UINT32 length) {
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unsigned int i;
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UINT32 Crc16Value=oldcrc;
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for (i=0; i < length; i++) {
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CM_MACRO_CRC16(Crc16Value,buffer);
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buffer++;
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}
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return ((UINT16)Crc16Value);
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}
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BYTE* charToUnsignedChar(char *buffer, UINT32 length){
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static BYTE buff[16];
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unsigned int i;
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for (i=0; i < length; i++){
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buff[i] = (BYTE)buffer[i];
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}
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return buff;
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}
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