1、BCC异或校验

从输入的HEX第一个字节开始，按字节依次循环计算异或值直到HEX结尾字节，得到的最终一个字节值。

2、C程序

/*******************************************************************************
_____ ___ ____  ___   _____    _             _   _             
| ____|_ _|  _ \|_ _| |_   _|__(_)_ __   __ _| | | |_   _  __ _ 
|  _|  | || |_) || |    | |/ __| | '_ \ / _` | |_| | | | |/ _` |
| |___ | ||  _ < | |    | |\__ \ | | | | (_| |  _  | |_| | (_| |
|_____|___|_| \_\___|   |_||___/_|_| |_|\__, |_| |_|\__,_|\__,_|* File Name          : main.c* Description        : This file provides code for bcc caculation in linuxc.* Author             : jackwang by jiawang16@foxmail.com* Date               : 2019-03-09
*******************************************************************************/
/*! -------------------------------------------------------------------------- */
/*! Include headers */
#include <stdio.h>
#include <string.h>
#include <stdbool.h>/*! -------------------------------------------------------------------------- */
/*! Private function declarations */
static unsigned char Char2Int(char chr,bool *isOK);/*! convert char to int type*/
static unsigned char HexStr2Int(char *str, bool *isOK);/*!convert hexstr to int*//*! -------------------------------------------------------------------------- */
/*! main function defination */
int main(int argc, char* argv[])
{int ret = 0;int numByte = argc; char bccVal = 0x00;char inPutbuff[10];bool isOK;int Nibb;if(argc == 1){printf("[note]  no params to caculate, please input hex string, splite by space!\r\n");}else{printf("[note]  input %d byte: ",numByte-1);for(int i = 1; i < numByte; i++){printf("%s ",argv[i]);}printf("\r\n");for(int i = 1; i < numByte; i++){memcpy(inPutbuff,argv[i],2);Nibb = HexStr2Int(inPutbuff,&isOK);if(isOK){bccVal ^= (char)Nibb;}}printf("\r\n");printf("[note]  bcc value: %02X\r\n",bccVal);}return 0;
}/*! -------------------------------------------------------------------------- */
/*! Private function definations */
/*! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static int Char2Int(char chr,bool *isOK)
{int nibb1;if(chr >= '0' && chr <= '9'){ nibb1 = chr - '0'; *isOK = true;}else if(chr >= 'a' && chr <= 'f'){ nibb1 = chr - 'a' + 10; *isOK = true;}else if(chr >= 'A' && chr <= 'F'){ nibb1 = chr -'A' + 10; *isOK = true; }else{  printf("[error]  invalid hex str input: %c \r\n",chr); *isOK = false; }return nibb1;
}
/*! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static int HexStr2Int(char *str, bool *isOK)
{int nibb1,nibb2;bool isOK1,isOK2;nibb1 = Char2Int(*str, &isOK1);nibb2 = Char2Int(*(str+1),&isOK2);if(isOK1 && isOK2){*isOK = true;return nibb1*16 + nibb2;}else{*isOK = false;return 0;}
} 

3、编译

~$ gcc main.c -o getbcc

4、使用

~$ ./getbcc 01 02 03 04 11
~$ [note]  input 5 byte: 01 02 03 04 11
~$ [note]  bcc value: 15