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profi200/crc7.c

Created February 29, 2024 17:08
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crc7.c
static u8 crc7(const u8 *data, u32 len)
{
u32 crc = 0; // u32 to avoid "and rX, rX, #0xFF" in the bit loop.
while(len--)
{
crc ^= *data++;
for(u32 i = 0; i < 8; i++)
{
if(crc & 0x80u) crc ^= 0x89u;
crc <<= 1;
}
}
return crc | 1u;
}
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