CRC16-modbus计算（C实现）

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

#include <stdio.h> #include <string.h> unsigned short utils_crc16_modbus( unsigned char *buff,int len) {     unsigned short tmp = 0xffff;     unsigned short ret1 = 0;         for(int n = 0; n < len; n++){         tmp = buff[n] ^ tmp;         for(int i = 0;i < 8;i++){             if(tmp & 0x01){                 tmp = tmp >> 1;                 tmp = tmp ^ 0xa001;             }               else{                 tmp = tmp >> 1;             }           }       }       return tmp; }