c example to use `FIELD_GET()` macro from zephyr

read_bit_field.c

#include <stdint.h>
#include <stdio.h>

// zephyr-latest/zephyr-proj/zephyr/include/zephyr/sys/util_macro.h

/** @brief Extract the Least Significant Bit from @p value. */
#define LSB_GET(value) ((value) & -(value))

/**
 * @brief Extract a bitfield element from @p value corresponding to
 *	  the field mask @p mask.
 */
#define FIELD_GET(mask, value)  (((value) & (mask)) / LSB_GET(mask))

int main(void)
{
    uint8_t val = 0xc4;

    printf("val=0x%X\n", val);

    for (int bit_num=7; bit_num>=0; bit_num--) {
        uint8_t mask = (1 << bit_num);
        printf("bit %d = %X\n", bit_num, FIELD_GET(mask, val));
    }
}

/*
val=0xC4
bit 7 = 1
bit 6 = 1
bit 5 = 0
bit 4 = 0
bit 3 = 0
bit 2 = 1
bit 1 = 0
bit 0 = 0
 */