51内核单片机实现CRC-16校验,同样适用于51内核的其他芯片(只要稍微修改一下PIC芯片同样适用)

#include "reg52.h"

#define uint8  unsigned char
#define uint16 unsigned int

unsigned char str[]={0x28,0x6D,0x00,0x85,0x00,0x00,0x00,0xCF};

uint16 CRC_16_UP_Bit(uint8 * dat, uint8 len, uint16 oldcrc);
uint16 CRC_16_UP_NiByte(uint8 * dat, uint8 len, uint16 oldcrc);
uint16 CRC_16_UP_Byte(uint8 * dat, uint8 len, uint16 oldcrc);
/*CRC的初始值为0x00,多项式为0xff00，高位在先 */

/*方法一 */
//---------------------------------------
// 功能:逐位计算CRC16(UP_左移正序)
// 输入:
//      uint8 * dat:要计算CRC的数据指针
//      uint8 len  :数据长度
//      uint16 oldcrc:CRC初始值
// 输出:生成的新CRC值
//---------------------------------------
uint16 CRC_16_UP_Bit(uint8 * dat, uint8 len, uint16 oldcrc)
{
   uint8 idata i,j;
   uint16 idata x,crc = oldcrc;
   for(i = 0;i < len;i ++)
   {
       crc = crc ^ (dat[i] << 8);
       for (j = 8;j > 0;j --)
       {
           x = crc & 0x8000;
           crc <<= 1;
           if (x != 0)crc ^= 0xFF00;