Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE 0u
#define MODE 1u
#define SPEED 3u

#define SET_ENABLE(x,b) x = x | (b << ENABLE) 
#define SET_MODE(x,b) x = x | (b << MODE) 
#define SET_SPEED(x,b) x = x | (b << SPEED) 

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t retVal = 0;
    SET_ENABLE(retVal,enable);
    SET_MODE(retVal,mode);
    SET_SPEED(retVal,speed);
    return retVal;
}

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