1、BCC異或校驗

從輸入的HEX第一個字節開始，按字節依次循環計算異或值直到HEX結尾字節，得到的最終一個字節值。

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、編譯

~$ 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

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