crc8hondak.cpp File Reference

Functions
static uint8_t	crc_init (void)
static uint8_t	crc_next (uint8_t crc, uint8_t data)
static uint8_t	crc_final (uint8_t crc)
uint8_t	crc_hondak_calc (const uint8_t *data, size_t len)

Function Documentation

crc_final()

static uint8_t crc_final ( uint8_t  crc )

inlinestatic

Definition at line 27 of file crc8hondak.cpp.

                                             {
    return ~crc;
}

Referenced by crc_hondak_calc().

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crc_hondak_calc()

uint8_t crc_hondak_calc	(	const uint8_t *	data,
		size_t	len
	)

Definition at line 31 of file crc8hondak.cpp.

                                                         {
    uint8_t crc = crc_init();
 
    if (len) do {
        crc = crc_next(crc, *data++);
    } while (--len);
 
    return crc_final(crc);
}

Referenced by kLineThread().

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crc_init()

static uint8_t crc_init ( void  )

inlinestatic

Definition at line 6 of file crc8hondak.cpp.

{
    return 0xff;
}

Referenced by crc_hondak_calc().

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crc_next()

static uint8_t crc_next ( uint8_t  crc, uint8_t  data  )

inlinestatic

Definition at line 11 of file crc8hondak.cpp.

{
    uint8_t eor;
    unsigned int i = 8;
 
    crc ^= data;
    do {
        /* This might produce branchless code */
        eor = crc & 1 ? 0xb8 : 0;
        crc >>= 1;
        crc ^= eor;
    } while (--i);
 
    return crc;
}

Referenced by crc_hondak_calc().

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