34 lines
779 B
C
34 lines
779 B
C
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#include <stdio.h>
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/* Name : CRC-8
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Poly : 0x31 x^8 + x^5 + x^4 + 1
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Init : 0xFF
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Revert: false
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XorOut: 0x00
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Check : 0xF7 ("123456789")
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MaxLen: 15 байт(127 бит) - обнаружение одинарных, двойных, тройных
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и всех нечетных ошибок */
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unsigned char Crc8(unsigned char*pcBlock, unsigned int len)
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{
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unsigned char crc=0xFF;
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unsigned int i;
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while (len--)
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{
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crc^=*pcBlock++;
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for (i =0; i <8; i++)
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crc=crc&0x80? (crc<<1) ^0x31:crc<<1;
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}
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return crc;
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}
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int main(int argc, char **argv)
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{
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unsigned char arr[] = {'1','2','3','4','5','6','7','8','9',0};
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arr[9] = Crc8(arr,9);
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printf("%x \n",Crc8(arr,9));
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arr[3]=7;
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printf("%x \n",Crc8(arr,9));
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return 0;
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}
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