crc16
看到一个很不错的crc16的函数，顺便写了一个小小的测试例子：
#include<stdio.h>
#define uint16_t unsigned short
#define uint8_t unsigned char
/*******************************************************************************
* @fn crc16
*
* @brief Run the CRC16 Polynomial calculation over the byte parameter.
*
* @param crc - Running CRC calculated so far.
* @param val - Value on which to run the CRC16.
*
* @return crc - Updated for the run.
*/
uint16_t crc16(uint16_t crc, uint8_t val)
{
const uint16_t poly = 0x1021;
uint8_t cnt;
for (cnt = 0; cnt < 8; cnt++, val <<= 1)
{
uint8_t msb = (crc & 0x8000) ? 1 : 0;
crc <<= 1;
if (val & 0x80)
{
crc |= 0x0001;
}
if (msb)
{
crc ^= poly;
}
}
return crc;
}
int main(){
uint16_t crc = 0;
uint8_t buf_value[10] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a};
int i;
for(i = 0;i < 10;i++){
crc = crc16(crc, buf_value[i]);
}
printf("%x\n",crc);
crc = 0;
for(i = 0;i < 10;i++){
crc = crc16(crc, buf_value[i]);
}
printf("%x\n",crc);
return 0;
}
运行结果：
以上是 crc16 的全部内容， 来源链接： utcz.com/a/53981.html
