Macro-Based Register Config Helper

Code

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

#define SET_ENABLE(reg, enable) (reg | enable)
#define SET_MODE(reg, mode)     (reg | mode<<1)
#define SET_SPEED(reg, speed)  (reg | speed<<3)

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

    return 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