Macro-Based Register Config Helper

Code

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

// Define macros here
#define set_enable(r,b)  ((r) |= (b))
#define set_mode(r,b)  ((r) |= (b)<<1)
#define set_speed(r,b)  ((r) |= (b)<<3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    if(enable >1 || mode >3 || speed > 7)
    {
        return 0;
    }
    
    uint8_t reg = 0;
    set_enable(reg,enable);
    set_mode(reg,mode);
    set_speed(reg,speed);

    //uint16_t temp = (uint16_t)reg;
    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