xcx.zip_checksum

#include <stdio.h> #include <math.h> typedef unsigned char uint8_t; typedef unsigned long uint32_t; uint8_t getChecksum8(const uint8_t *msg,uint32_t size) { uint8_t sum1 = 0; uint8_t sum2 = 0; while(size--) { sum1 += *msg++; sum2 += sum1; } return sum1^sum2; } int main(void) { uint8_t a[] = { 0xc0, 0x00, 0x01, 0x01, 0x01, 0x20, 0x02, 0x02, 0x00, 0x01, 0x10}; //uint8_t a[9] = {0xc0,0x00,0x01,0x00,0x01,0x02,0x01,0x00,0x00}; //uint8_t a[9] = {0xc0,0x00,0x01,0x80,0x01,0x00,0x00,0x01,0x01}; printf("the chechsum = %x",getChecksum8(a,sizeof(a))); return 0; }