crc.c düzenlemesi

1 file changed, 30 insertions

crc.c(dosya oluşturuldu)

		@@ -0,0 +1,30 @@
1	+	#define POLY 0xA001
2	+	#define POLY 0x8005
3	+	unsigned crc16(unsigned crc, unsigned char *buf, size_t len)
4	+	{
5	+	while (len--) {
6	+	crc ^= *buf++;
7	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
8	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
9	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
10	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
11	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
12	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
13	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
14	+	crc = crc & 1 ? (crc >> 1) ^ POLY : crc >> 1;
15	+	}
16	+	return crc;
17	+	}
18	+
19	+	int main(void)
20	+	{
21	+	unsigned crc;
22	+	unsigned char buf[] = {0x00, 0x19, 0x02 };
23	+
24	+	crc = crc16(0x0, buf, 3);
25	+	printf("%04x\n", crc);
26	+	crc = crc16(0xFFFF, buf, 3);
27	+	printf("%04x\n", crc);
28	+	return 0;
29	+	}
30	+

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