48 lines
867 B
C
48 lines
867 B
C
#include <os_internal.h>
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u8 __osContAddressCrc(u16 addr)
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{
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u8 temp;
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u8 temp2;
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int i;
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temp = 0;
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for (i = 0; i < 16; i++)
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{
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if (temp & 0x10)
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temp2 = 21;
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else
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temp2 = 0;
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temp <<= 1;
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temp |= (u8)((addr & 0x400) ? 1 : 0);
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addr <<= 1;
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temp ^= temp2;
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}
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return temp & 0x1f;
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}
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u8 __osContDataCrc(u8 *data)
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{
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u8 temp;
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u8 temp2;
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int i;
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int j;
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temp = 0;
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for (i = 0; i <= 32; i++, data++)
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{
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for (j = 7; j >= 0; j--)
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{
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if (temp & 0x80)
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temp2 = 133;
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else
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temp2 = 0;
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temp <<= 1;
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if (i == 32)
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temp &= -1;
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else
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temp |= ((*data & (1 << j)) ? 1 : 0);
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temp ^= temp2;
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}
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}
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return temp;
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}
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