Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(reg,value) ((reg & (~(1))) | value);
#define SET_MODE(reg,value) ((reg & (~(3U<<1))) | (value<<1));
#define SET_SPEED(reg,value) ((reg & (~(7U<<3))) | (value<<3)); 

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    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