crc16.c

来自「我做的用lpc2119实现的变电站隔刀动作电流波形采样计算数据上传程序」· C语言 代码 · 共 596 行 · 第 1/2 页

C
596 行
字号
12
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);
}
12

crc16.c - 源码说明

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