概述
1.异或校验
#include<stdio.h>
typedef unsigned char uint8_t;
uint8_t XOR_check(uint8_t *Buf, uint8_t Len)
{
uint8_t i = 0;
uint8_t x = 0;
for(i=0; i<Len; i++)
{
x = x^(*(Buf+i));
}
return x;
}
int main()
{
uint8_t tx[2] = {0x11,0x22};
uint8_t s;
s = XOR_check(tx,2);
printf("result=%xn",s);
}
异或校验测试网站 异或校验
http://www.ip33.com/bcc.html
校验和
// 8位校验和
uint8_t TX_CheckSum(uint8_t *buf, uint8_t len) //buf为数组,len为数组长度
{
uint8_t i, ret = 0;
for(i=0; i<len; i++)
{
ret += *(buf++);
}
ret = ~ret;
return ret;
}
//16位校验和
unsigned short CheckSum16(char *addr, int count)
{
register int sum = 0;
while( count > 1 )
{
sum =sum+*(unsigned short*)addr;
addr+=2;
count -= 2;
}
if( count > 0 )//=1,说明count为奇数
sum += *addr;
while (sum>>16)//当和的高16位不为0,把高16位作为校验和的一部分求和,
sum = (sum & 0xffff) + (sum >> 16);
return (short)~sum;
}
原理:
1、校验和的计算:将缓冲区的数据中挨个数累加(X),然后取反输出(~X)。
2、校验:将缓冲区的数据和校验和(X)一起求校验和,累加和(Y(及取反输出(Y)。Y =缓冲区的数据累加(X(+校验和(X)=0XFFFF。Y=0。所以当结果为0,说明数据传输没问题。
如果校验和计算时高16位(XH)不等于零,(XH)+(XL)= Z,新校验和为~Z。 校验时,再次求校验和 :先求和(XH)*2^16 +(XL)+ ~Z= (XH)*2^16 +(XL)+ 0XFFFF - Z =(XH)*2^16+(0XFFFF -(XH))=Y.YH=XH,YL=(0XFFFF -(XH),YH+YL=0XFFFF.
CRC8和CRC16校验
//CRC高位字节值表
const uint8_t auchCRCHi[] = {
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40
};
//CRC 低位字节值表
const uint8_t auchCRCLo[]={
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
0x41, 0x81, 0x80, 0x40
};
//获得CRC16值
//puchMsg:要校验的数组
//usDataLen:数组长度
//初始值0XFFFF,异或值0x0000,LSB First,多项式8005
uint16_t Get_Crc16(uint8_t *puchMsg,uint16_t usDataLen)
{
uint8_t uchCRCHi=0xFF; //高CRC 字节初始化
uint8_t uchCRCLo=0xFF; //低CRC 字节初始化
uint32_t uIndex; //CRC 循环中的索引
while(usDataLen--) //传输消息缓冲区
{
uIndex=uchCRCHi^*puchMsg++; //计算CRC
uchCRCHi=uchCRCLo^auchCRCHi[uIndex];
uchCRCLo=auchCRCLo[uIndex];
// uchCRCLo=uchCRCHi^auchCRCHi[uIndex];
// uchCRCHi=auchCRCLo[uIndex];
}
return (uchCRCHi<<8|uchCRCLo);
}
//CRC8校验
//ptr:要校验的数组
//len:数组长度
//返回值:CRC8码
//多项式0X31,LSB First,初始值0X00
uint8_t Get_Crc8(uint8_t *ptr,uint16_t len)
{
uint8_t crc;
uint8_t i;
crc=0;
while(len--)
{
crc^=*ptr++;
for(i=0;i<8;i++)
{
if(crc&0x01)crc=(crc>>1)^0x8C;
else crc >>= 1;
}
}
return crc;
}
//获得CRC16值
//puchMsg:要校验的数组
//usDataLen:数组长度
//初始值0XFFFF,异或值0x0000,LSB First,多项式A001
uint16_t CRC16(uint8_t* pdata, uint16_t datalen)
{
uint8_t CRC16Lo,CRC16Hi,CL,CH,SaveHi,SaveLo;
uint16_t i,Flag;
CRC16Lo = 0xFF;
CRC16Hi = 0xFF;
CL = 0x01;
CH = 0xA0;
for(i = 0; i < datalen; i++)
{
CRC16Lo ^= *(pdata + i);
for(Flag = 0; Flag < 8; Flag ++)
{
SaveHi = CRC16Hi;
SaveLo = CRC16Lo;
CRC16Hi >>= 1;
CRC16Lo >>= 1;
if((SaveHi & 0x01) == 0x01)
CRC16Lo |= 0x80;
if((SaveLo & 0x01) == 0x01)
{
CRC16Hi ^= CH;
CRC16Lo ^= CL;
}
}
}
return (CRC16Hi << 8) | CRC16Lo;
}
附
按符合提取字符串内容到数组中
/*
str: 为要提取的字符串
delims: 为指定符号
array: 为提取后的内容
返回值: 为提取内容的数组长度
*/
int split(char str[], char delims[], uint8_t array[])
{
char *result = NULL;
int count =0;
result = strtok( str, delims );
while( result != NULL )
{
//printf( "result is "%s"n", result );
array[count++] = atoi(result);
result = strtok( NULL, delims );
}
return count;
}
使用举例:
char delims[] = ",";
uint8_t str[] = "1,2,3,4,5,6,7,8,9,10";
uint8_t array[50] = {0};
int len=0;
len = split(str, delims, array); // 1 2 3 4 5 6 7 8 9 10
在线校验网站
http://www.metools.info/code/c15.html
最后
以上就是沉默飞机为你收集整理的通讯协议制定之常用校验的实现1.异或校验校验和CRC8和CRC16校验附在线校验网站的全部内容,希望文章能够帮你解决通讯协议制定之常用校验的实现1.异或校验校验和CRC8和CRC16校验附在线校验网站所遇到的程序开发问题。
如果觉得靠谱客网站的内容还不错,欢迎将靠谱客网站推荐给程序员好友。
本图文内容来源于网友提供,作为学习参考使用,或来自网络收集整理,版权属于原作者所有。
发表评论 取消回复