两种CRC计算函数如下， 因为函数主要是异或运算，按给定的算法，应该会得到相同的结果，两个同样的值异或就变成0了！
const uchar CrcTable[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};
//-------------CRC Check----------------------
uchar CRC_OK(uchar *p)
{
uchar OutData,InData;
uchar countbyte,bitlen;
uchar crctem1,crctem2;
OutData=0;
for(countbyte=1;countbyte<10;countbyte++)
{
InData=*p;
for(bitlen=1;bitlen<9;bitlen++)
{
crctem1=OutData;
crctem2=crctem1^InData;
crctem2&=0x01;
OutData>>=1;
if(crctem2)
{
OutData+=0x80;
OutData^=0x0c;
}
InData>>=1;
}
p++;
}
return(!OutData);
}
uchar CRC_OK1(uchar *p1,uchar num)
{
uchar OutData1;
uchar countbyte1;
OutData1=0;
for(countbyte1=1;countbyte1<num;countbyte1++)
{
OutData1=CrcTable[OutData1^*p1];
p1++;
}
p1-=(num-1);
return(OutData1);
} |
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