1. crc8校验接口

static uint8_t crc8( uint8_t * p_buffer, uint16_t buf_size )
{
    uint8_t crc = 0;
    uint8_t i=0;
    if(buf_size <= 0)
    {
        return crc;
    }
    while( buf_size-- )
    {
        for (  i = 0x80; i != 0; i /= 2 )
        {
            if ( (crc & 0x80) != 0)
            {
                crc *= 2;
                crc ^= 0x07; 
            }
            else
            {
                crc *= 2;
            }
            if ( (*p_buffer & i) != 0 )
            {
                crc ^= 0x07;
            }
        }
        p_buffer++;
    }
    return crc;
}

2.测试

#include "stdlib.h"
#include <stdio.h>
typedef unsigned char uint8_t;
typedef unsigned int uint16_t;
int main(void)
{
  uint8_t tempbuf[]={0x01,0x02,0x03,0x4,0x5};
  uint8_t crc=0;

  crc=crc8(tempbuf,5);

  printf("crc %x\r\n",crc);
  return 0; 

}

运行： 

root@ubuntu:/home/smbshare/crc8# gcc -o crc crc8.c 
root@ubuntu:/home/smbshare/crc8# ./crc 
crc bc

对比工具检验

CRC8校验接口（C语言）_ubuntu

说明接口正确。