几种CRC计算源码

来源：互联网发布：淘宝客服怎么设置挂起编辑：程序博客网时间：2024/06/06 10:52

void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)

{

int i;

unsigned char tmp[4];

tmp[0] = 0;

for (i=0; i< 8; i++) {

if (srcBuf[0]& (1 << i))

tmp[0]|=1<<(7-i);

}

dBuf[0] = tmp[0];

//}

}

void InvertUint16(unsigned short *dBuf,unsigned short *srcBuf)

{

int i;

unsigned short tmp[4];

tmp[0] = 0;

for (i=0; i< 16; i++) {

if (srcBuf[0]& (1 << i))

tmp[0]|=1<<(15 - i);

}

dBuf[0] = tmp[0];

}

unsigned short CRC16_CCITT(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0x0000;

unsigned short wCPoly = 0x1021;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

InvertUint8(&wChar,&wChar);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

InvertUint16(&wCRCin,&wCRCin);

return (wCRCin) ;

}

unsigned short CRC16_CCITT_FALSE(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0xFFFF;

unsigned short wCPoly = 0x1021;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

return (wCRCin) ;

}

unsigned short CRC16_XMODEM(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0x0000;

unsigned short wCPoly = 0x1021;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

return (wCRCin) ;

}

unsigned short CRC16_X25(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0xFFFF;

unsigned short wCPoly = 0x1021;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

InvertUint8(&wChar,&wChar);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

InvertUint16(&wCRCin,&wCRCin);

return (wCRCin^0xFFFF) ;

}

unsigned short CRC16_MODBUS(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0xFFFF;

unsigned short wCPoly = 0x8005;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

InvertUint8(&wChar,&wChar);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

InvertUint16(&wCRCin,&wCRCin);

return (wCRCin) ;

}

unsigned short CRC16_IBM(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0x0000;

unsigned short wCPoly = 0x8005;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

InvertUint8(&wChar,&wChar);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

InvertUint16(&wCRCin,&wCRCin);

return (wCRCin) ;

}

unsigned short CRC16_MAXIM(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0x0000;

unsigned short wCPoly = 0x8005;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

InvertUint8(&wChar,&wChar);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

InvertUint16(&wCRCin,&wCRCin);

return (wCRCin^0xFFFF) ;

}

unsigned short CRC16_USB(unsigned char *puchMsg,unsigned int usDataLen)

{

unsigned short wCRCin = 0xFFFF;

unsigned short wCPoly = 0x8005;

unsigned char wChar = 0;

while (usDataLen--)

{

wChar = *(puchMsg++);

InvertUint8(&wChar,&wChar);

wCRCin ^= (wChar << 8);

for(int i = 0;i < 8;i++)

{

if(wCRCin & 0x8000)

wCRCin = (wCRCin << 1) ^ wCPoly;

else

wCRCin = wCRCin << 1;

}

InvertUint16(&wCRCin,&wCRCin);

return (wCRCin^0xFFFF) ;

}

CRC在线计算网址：http://www.ip33.com/crc.html

阅读全文

0 0