#include "CRC_Functions.h"
#pragma DATA_SECTION(crc_16_tab, ".slow_vars")
WORD crc_16_tab[] = {
 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040
};

unsigned char GetCRC8_Dallas1_WireReverse(unsigned char *DataArrIn, unsigned int DataLength)
{
	unsigned char i, Data = 0, CRC = 0, CheckBit;
	unsigned int ByteCnt = 0;

	do
	{
		Data = DataArrIn[ByteCnt];
		for(i = 0; i < 8; i++)
		{
			CheckBit = CRC ^ Data;
			CheckBit &= 1;
			CRC >>= 1;
			Data >>= 1;
			if(CheckBit == 1) CRC ^= 0x8C;
		}
		ByteCnt++;
	}
	while(ByteCnt < DataLength);

	return CRC;
}

unsigned char GetCRC8_Dallas1_Wire(unsigned char *DataArrIn, unsigned int DataLength)
{
    unsigned char CRC = 0x00;
    unsigned int i;
 
    while (DataLength--)
    {
        CRC ^= *(DataArrIn++);
 
        for (i = 0; i < 8; i++) CRC = (CRC & 0x80 ? (CRC << 1) ^ 0x31 : CRC << 1) & 0x00FF;
    }
 
    return CRC;
}

unsigned int GetCRC16_IBM(unsigned int crc, unsigned int *buf, unsigned int size)
{

	while(size--)
	{
		crc = (crc >> 8) ^ crc_16_tab[ (crc ^ *buf++) & 0xff ];
		crc = crc & 0xffff;
	}

	return (crc & 0xffff);
}


unsigned int GetCRC16_IBM_v2(unsigned int crc, unsigned int *buf, unsigned int size)
{
    unsigned int xor = 0;


    while(size--)
    {
//        crc = (crc >> 8) ^ crc_16_tab[ (crc ^ *buf++) & 0xff ];
//        crc = crc & 0xffff;

        xor = ((*buf++) ^ crc) & 0xff;
        crc >>= 8;
        crc ^= crc_16_tab[xor];
    }

    return (crc & 0xffff);
}


unsigned int GetCRC16_B(unsigned int crc,unsigned int *buf,unsigned long size )
{
                               
unsigned int x, dword, byte;
unsigned long i;



	for (i = 0; i < size; i++) 
	{
		x = i % 2;
		
		dword = buf[i/2];		
//		dword = *buf;		

        
		if (x == 0)      
		{
			byte = ((dword >> 8)&0xFF);
		}

		if (x == 1) 
		{
			byte = (dword & 0xFF);
		}                      
		  
        crc = (crc >> 8) ^ crc_16_tab[ (crc ^ (byte) ) & 0xff ];
        crc = crc & 0xffff;
        
//		crc = crc + ((byte) & 0xff);

	}
	
 return (crc & 0xffff);
}