CRC8校验接口（C语言）

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

说明接口正确。

文章来源: xintiaobao.blog.csdn.net，作者：心跳包，版权归原作者所有，如需转载，请联系作者。

原文链接：xintiaobao.blog.csdn.net/article/details/102930247