avg8r()

LIB8STATIC_ALWAYS_INLINE uint8_t avg8r	(	uint8_t	i,
		uint8_t	j )

Calculate an integer average of two unsigned 8-bit integer values (uint8_t), rounded up.

Fractional results are rounded up, e.g. avg8r(20,41) = 31

Parameters

i	first value to average
j	second value to average

Returns

mean average of i and j, rounded up

Definition at line 257 of file math8.h.

                                                             {
#if AVG8R_C == 1
    return (i + j + 1) >> 1;
#elif AVG8R_AVRASM == 1
    asm volatile(
        /* First, add j to i, 9th bit overflows into C flag */
        "add %0, %1          \n\t"
        /* Divide by two, moving C flag into high 8th bit, old 1st bit now in C
         */
        "ror %0              \n\t"
        /* Add C flag */
        "adc %0, __zero_reg__\n\t"
        : "+r"(i)
        : "r"(j));
    return i;
#else
#error "No implementation for avg8r available."
#endif
}

References LIB8STATIC_ALWAYS_INLINE.