📄 crc16.c
字号:
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
static char 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
} ;
*/
uint16 CRC_16(uint8 * aData, uint16 aSize )
{
uint16 i;
uint16 nAccum = 0xffff;
for ( i = 0; i < aSize; i++ )
nAccum = ( nAccum << 8 ) ^ (uint16)modbus_crc16[( nAccum >> 8 ) ^ *aData++];
return nAccum;
}
uint16 CRC_16a(uint8 * aData,SampleData1 * bData, uint16 aSize, uint16 bSize )
{
uint16 i;
uint16 nAccum = 0xffff;
for ( i = 0; i < aSize; i++ )
nAccum = ( nAccum << 8 ) ^ (uint16)modbus_crc16[( nAccum >> 8 ) ^ *aData++];
for ( i = 0; i < bSize; i++ )
{
nAccum = ( nAccum << 8 ) ^ (uint16)modbus_crc16[( nAccum >> 8 ) ^ bData->byte.high];
nAccum = ( nAccum << 8 ) ^ (uint16)modbus_crc16[( nAccum >> 8 ) ^ bData->byte.low];
bData++;
}
return nAccum;
}
uint16 CRC_16b(uint16 Data,SampleData1 * bData)
{
uint16 i;
uint16 nAccum = Data;
nAccum = ( nAccum << 8 ) ^ (uint16)modbus_crc16[( nAccum >> 8 ) ^ bData->byte.high];
nAccum = ( nAccum << 8 ) ^ (uint16)modbus_crc16[( nAccum >> 8 ) ^ bData->byte.low];
return nAccum;
}
uint16 udf_crc(uint8 *data, uint32 size, uint16 crc)
{
crc=0xffff; //test
while (size--)
crc = modbus_crc16[(crc >> 8 ^ *(data++)) & 0xffU] ^ (crc << 8);
return crc;
}
uint16 crc16_byte(uint16 crc, uint8 data)
{
return (crc << 8) ^ modbus_crc16[(crc>>8 ^ data) & 0xff];
}
uint16 crc16(uint16 crc, uint8 *buffer, uint16 len)
{
crc=0xffff; //test
while (len--)
crc = crc16_byte(crc, *buffer++);
return crc;
}
uint16 modbusCRC16(uint8 *puchMsg, uint16 usDataLen) //*puchMsg 要进行CRC 校验的消息 usDataLen 消息中字节数
{
uint8 uchCRCHi = 0xff ; /* 高CRC 字节初始化*/
uint8 uchCRCLo = 0xff ; /* 低CRC 字节初始化*/
uint8 temp;
uint8 uIndex ; /* CRC 循环中的索引*/
while (usDataLen--) /* 传输消息缓冲区*/
{
uIndex = uchCRCHi ^ *puchMsg++ ; /* 计算CRC */
//temp=
uchCRCHi = uchCRCLo ^ (modbus_crc16[uIndex] >>8) ;
uchCRCLo = modbus_crc16[uIndex] & 0xff ;
//uIndex = temp ^ *puchMsg++ ;
//temp=temp<<8 ^ (crc16_tablea[uIndex] & 0xff) ;
}
return ( uchCRCLo << 8 | uchCRCHi) ;
//return (temp);
}
#define maskcrc 0xa001
uint16 crc16r(uint8 *ptr, uint16 len)
{
uint8 i;
uint16 crc=0xffff;
while(len--!=0)
{
crc ^= (*ptr++);
for(i=0;i<8;i++)
{
if((crc&0x0001)!=0) {crc >>= 1; crc ^= maskcrc;}
else crc >>= 1;
}
}
return(crc);
}
uint16 CRC16b(uint8 *Array,uint16 Len)
{
uint16 IX,IY,CRCa;
//uint8 *Rcvbuf;
CRCa=0xffff;//set all 1
if (Len==0)
CRCa = 0;
else
{
//Len--;
for (IX=0;IX<Len;IX++)
{
CRCa=CRCa^(uint16)(*Array);
for(IY=0;IY<8;IY++)
{
if ((CRCa & 1)!=0 )
CRCa=(CRCa>>1)^0xA001;
else
CRCa=CRCa>>1; //
}
Array++;
}
}
//Rcvbuf[0] = (CRCa & 0xff00)>>8;//高位置
//Rcvbuf[1] = (CRCa & 0x00ff); //低位置
return CRCa;
}
uint16 crc_gen(uint8 data[],uint16 num)
{
uint16 i,j;
uint16 code,carry;
code=0xffff;
for(i=0;i<num;i++)
{
code=code ^data[i];
for(j=0;j<8;j++)
{
carry=code &0x0001;
code=code>>1;
if(carry==1)code=code^0xa001;
}
}
return code;
}
uint16 WNCRC16(uint16 usStartValue, uint16 usPolynomial,uint8 *pby, uint16 ilen)
{
uint16 usCRC16 = usStartValue;
uint16 usTemp1 = 0;
uint16 usTemp2 = 0;
uint16 usFlag = 0;
uint8 byTemp = 0x00;
uint16 i=0;
uint16 j=0;
for(i=0; i<ilen ; i++)
{
byTemp = pby[i];
usCRC16 = usCRC16^byTemp;
for(j=0; j<8; j++)
{
usFlag = usCRC16 & 0x0001;
usTemp1 = (usCRC16>>1);
if(usFlag == 0)
{
usTemp2=0;
}
else
{
usTemp2 = usPolynomial;
}
usCRC16 = usTemp1^usTemp2;
}
}
return usCRC16;
}
void BuildTable16(uint16 aPoly, uint16 Table_CRC[256])
{
uint16 i, j;
uint16 nData;
uint16 nAccum;
for ( i = 0; i < 256; i++ )
{
nData = ( uint16 )( i << 8 );
nAccum = 0;
for ( j = 0; j < 8; j++ )
{
if ( ( nData ^ nAccum ) & 0x8000 )
nAccum = ( nAccum << 1 ) ^ aPoly;
else
nAccum <<= 1;
nData <<= 1;
}
Table_CRC[i] = ( uint16 )nAccum;
}
}
#define GX 0x1021
void BuildTable16a(uint16 aPoly, uint16 Table_CRC[256])
{
uint16 i;
uint16 crc;
uint8 n,tmp;
for(i =0; i<256; i++)
{
crc = i << 8;
for(n=0; n<8; n++)
{
if(crc & (1<<15))
crc ^= GX;
else
crc <<= 1;
}
Table_CRC[i] = crc;
}
}
uint16 CRC162(uint8 *ptr,uint16 len)
{
uint16 CRCtbl[16]={ /* CRC余式表 */
0x0000,0xCC01,0xD801,0x1400,0xF001,0x3C00,0x2800,0xE401,
0xA001,0x6C00,0x7800,0xB401,0x5000,0x9C01,0x8801,0x4400
};
uint16 crc=0xffff;
uint8 da;
while(len--!=0)
{
da = crc^*ptr;
crc >>= 4;
crc ^= CRCtbl[da&0x0f];
da = crc^((*ptr)>>4);
crc >>= 4;
crc ^= CRCtbl[da&0x0f];
ptr++;
}
return(crc);
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