Macro-Based Register Config Helper

Code

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

#define ENABLE_BIT      (1 << 0)
#define MODE_SHIFT      1
#define SPEED_SHIFT     3

#define SET_ENABLE(x)   ((x) ? ENABLE_BIT : 0)
#define SET_MODE(x)     (((x) & 0x3) << MODE_SHIFT)
#define SET_SPEED(x)    (((x) & 0x7) << SPEED_SHIFT)


uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t my_reg = 0;
    my_reg |= SET_ENABLE(enable);
    my_reg |= SET_MODE(mode);
    my_reg |= SET_SPEED(speed);

    return my_reg;
}

int main() {
    uint8_t enable, mode, speed;
    scanf("%hhu %hhu %hhu", &enable, &mode, &speed);

    uint16_t reg = build_register(enable, mode, speed);
    printf("%u", reg);
    return 0;
}

Solving Approach