crc8.c

#include"crc8.h"

uint8_t CRC8(uint8_t input, uint8_t seed)	//Policz CRC dla jednego bajtu
{
    uint8_t i, feedback;
    for (i=0; i<8; i++)
    {
        feedback = ((seed ^ input) & 0x01);
        if (!feedback) seed >>= 1;
        else
        {
            seed ^= 0x18;
            seed >>= 1;
            seed |= 0x80;
        }
        input >>= 1;
    }

    return seed;
}
const uint8_t crclockup[256] = {0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
							157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
							35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
							190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
							70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
							219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
							101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
							248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
							140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
							17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
							175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
							50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
							202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
							87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
							233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
							116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
uint8_t CountCRC2(uint8_t c[])
{
	uint8_t result = 0x00;
	result = crclockup[c[0] ^ result];
	result = crclockup[c[1] ^ result];
	result = crclockup[c[2] ^ result];
	return result;
}
uint8_t CountCRC(uint8_t initVal, uint8_t c[], uint8_t size)  // Policz CRC dla danych znajduj¹cych siê
															// pod wskaŸnikim c o rozmiarze size bajtów
{
//	printf("in side\n");
	uint8_t i;
	for(i = 0; i < size; i++)
	{
//		printf("0x%x;",c[i] ^ initVal);
		initVal = crclockup[c[i] ^ initVal];
	}
	return initVal;
//		uint8_t i;
//		for(i = 0; i < size; i++)
//		{
//			initVal = CRC8(c[i],initVal);//[c[i] ^ initVal];
//			printf("0x%x;",initVal);
//		}
//		printf("sizeof localtable %d\n",sizeof(crclockup));
//		return initVal;
}