main.c

用VC编写的CRC校验程序,在加一个中断向量表程序就可以调试运行了！

#define	 u8       unsigned char
#define	 s8       char
#define	 u16      unsigned short
#define	 s16      short
#define	 u32      unsigned int
#define	 s32      int
#define	 u40      unsigned long
#define	 s40      long


u16   Byte_Size;
u8    *p_Data;
u16   *p16_Data;
u8    Crc_Data[15];
u16   Crc16_Data[15];
u16   Bit_Size;
u16   Crc_Result;
u16   Word_Size;


const u16 crc_table[256] = 
{
	0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
	0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
	0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
	0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
	0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
	0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
	0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
	0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
	0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
	0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
	0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
	0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
	0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
	0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
	0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
	0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
	0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
	0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
	0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
	0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
	0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
	0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
	0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
	0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
	0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
	0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
	0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
	0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
	0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
	0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
	0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
	0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};



u16 CrcCheck(u16 byteSize, u8 * pData, u16 bitSize)
{
	u32  temp=0;
	u32  temp0=0;
	u16  temp1=0;
	u16  i=0;
	u32  Bit_Coming=0;
	u16  Crc_Reg_temp=0;
	u8   * data;
	u16  crc=0;

    ////////////////////////////////////
    data = pData;
	temp0 = bitSize%8;
	temp1 = byteSize-1;
	
    if(temp0 != 0)
    {
    	byteSize = byteSize-1;
    }
    else
    {
    	byteSize = byteSize;
    }

	while (byteSize--)
	{
		crc = crc_table[(crc >> 8 ^ *(data++))] ^ (crc << 8);
	}
	
	if(temp0 != 0)	
	{
	   for(i=0;i<temp0;i++)
	   {
		   Bit_Coming = (pData[temp1]>>(7-i)) & 0x01;	
		    
		   Crc_Reg_temp = crc<< 1;  			
		   Crc_Reg_temp = Crc_Reg_temp & 0xEFDE;	
		    
		   temp =  ((crc>>15) & 1)^ Bit_Coming;
		   Crc_Reg_temp = Crc_Reg_temp | temp;	
		    
		   Crc_Reg_temp = Crc_Reg_temp | ((((crc>>4) & 1) ^ temp)<<5);	
		   
		   Crc_Reg_temp = Crc_Reg_temp | ((((crc>>11) & 1) ^ temp)<<12);	
		    
		   crc = Crc_Reg_temp;	       
	   }
	}
	
	return(crc);   //算221个数大约得用1553个时钟，因此时间可以接收
	
} //u16 CrcCheck(u16 byteSize, u8 * pData, u16 bitSize) 



void initialize(void)
{
    u8 i;

    Crc_Result = 0;             //crc校验结果
     
	Byte_Size = 14;				//字节个数
	Word_Size = 14;				//字个数
	p_Data = & Crc_Data[0];		//指针指向待校验的数据
	p16_Data = & Crc16_Data[0]; //
	Bit_Size = Byte_Size*8;     //15*8比特个数
	
	for(i=0;i<15;i++)			//初始化待校验的数据
	
	{
	  Crc_Data[i] = i+1;
	
	}
	
	Crc16_Data[0] = 0x0201;
	Crc16_Data[1] = 0x0403;
	Crc16_Data[2] = 0x0605;
	Crc16_Data[3] = 0x0807;
	Crc16_Data[4] = 0x0A09;
	Crc16_Data[5] = 0x0C0B;
	Crc16_Data[6] = 0x0E0D;
	Crc16_Data[7] = 0x100F;
	Crc16_Data[8] = 0x1211;
	Crc16_Data[9] = 0x1413;
	
}



void AddCRC(u16 *pin,u16 DataLength)
{
	u16 poly;					// generation polynomial
	u16 p[16];
	u16 q;						// quotient
	u32 res;						// remainder
	u16 i,j; 
	u32 temp,temp1; 	
	
//the input data of crc calculate block is 8 bit before,and 16bit now;
//the account of input data byte is maybe odd number;

	poly = (1<<12) | (1<<5) | 1;
	res = 0;
	if(DataLength%2==0)
	{
		for(i=0; i<(DataLength/2); i++)
		{    
			for(j=0;j<16;j++)
			{ 			
				p[j]=(pin[i]>>(15-j))&1;
				q = (res >> 15) ^ p[j];
				res <<= 1;
				res=res&0x10000-1;
				if( q == 1 )
				{
					res ^= poly;
				} 			
			}
		}
		temp=0; 
		for(i=0;i<16;i++)
		{
			temp1=(res>>(15-i))&0x1;
			temp=temp+(temp1<<(15-i));	
		}    
	pin[DataLength/2]=temp;
	}
	else
	{
		for(i=0; i < DataLength/2; i++)
		{    
			for(j=0;j<16;j++)
			{ 			
				p[j]=(pin[i]>>(15-j))&1;
				q = (res >> 15) ^ p[j];
				res <<= 1;
				res=res&0x10000-1;
				if( q == 1 )
				{
					res ^= poly;
				} 			
			}			
		}
		for(j=0;j<8;j++)
			{ 			
				p[j]=(pin[i]>>(15-j))&1;
				q = (res >> 15) ^ p[j];
				res <<= 1;
				res=res&0x10000-1;
				if( q == 1 )
				{
					res ^= poly;
				} 			
			} 
		temp=0; 
		for(i=0;i<16;i++)
		{
			temp1=(res>>(15-i))&0x1;
			temp=temp+(temp1<<(15-i));	
		} 
		pin[DataLength/2]=(pin[DataLength/2]&0xff00)+(temp>>8);
		pin[DataLength/2+1]=(temp<<8)&0xff00;		
	} 
	
}

u16  AddCRC8(u8 *pin,u16 DataLength)
{
	u16 poly;					// generation polynomial
	u16 p[16];
	u16 q;						// quotient
	u16 res;						// remainder
	u16 i,j; 
	u16 temp,temp1; 	
	
//the input data of crc calculate block is 8 bit before,and 16bit now;
//the account of input data byte is maybe odd number;

	poly = (1<<12) | (1<<5) | 1;   //生成多项式，0x11021  x^12 + x^5 + 1 
	res = 0;

	for(i=0; i<DataLength; i++)
	{    
		for(j=0;j<8;j++)
		{ 			
			p[j]=(pin[i]>>(7-j))&1;
			q = (res >> 15) ^ p[j];
			res <<= 1;
			res=res&0x10000-1;
			if( q == 1 )
			{
				res ^= poly;
			} 			
		}
	}
	temp=0; 
	for(i=0;i<16;i++)
	{
		temp1=(res>>(15-i))&0x1;
		temp=temp+(temp1<<(15-i));	
	}   
	 
	return(temp);

}



void main()
{
   
   
   initialize();
   
   Crc_Result = CrcCheck(Byte_Size, p_Data, Bit_Size); //查表法得到检验结果
   
   AddCRC(p16_Data,Word_Size);   //16bitCRC 校验，没有验证过，可能存在问题
   
   Crc_Result = AddCRC8(p_Data, Byte_Size);  //按照8bit 算法校验，得到的结果和查表法一致
   
   while(1)
   {
     asm(" nop ");
     
   }
   
}