CRC8校验函数通用版VC


CRC数据校验是常用的功能函数,对下位机程序收发有效数据合理性进行校验,具体代码如下,建议收藏体会。程序是VC版本,你可以改造成需要的版本。

#include "stdafx.h"

const unsigned char CRC_CODE[] = {
0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
 157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
 35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
 190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
 70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
 219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
 101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
 248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
 140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
 17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
 175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
 50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
 202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
 87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
 233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
 116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53
};

unsigned short Check_CRC8(unsigned char *data)   // 8位crc校验,适用于DS18B20数据校验!
{

 unsigned char temp ,i;
 unsigned char *p=data ;

 temp=0 ;
 for(i=0;i<7;i++)
 {
  temp=CRC_CODE[temp^*p] ;
  p++ ;
 }

 if(temp==data[7])
  return 1 ;         //校验ok!
 else
  return 0 ;         //校验失败

}


int _tmain(int argc, _TCHAR* argv[])
{
 int i=0;

    unsigned short result=0;

 unsigned char ss[] = {40,8,4,114,1,0,0,164};   // 返回的ROM值!

 result=Check_CRC8(ss);
 
 printf("Output CRC8 = %X \n",result);

 scanf("%d",i);

}

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