Macro-Based Register Config Helper

Code

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

// Define macros here
#define set_enable(reg, value) (((reg) | ((value) << 0)))
#define set_mode(reg, value)   (((reg) | ((value) << 1)))
#define set_speed(reg, value)  (((reg) | ((value) << 3)))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t control_reg = 0;
    control_reg = set_enable(control_reg, enable);
    control_reg = set_mode(control_reg, mode);
    control_reg = set_speed(control_reg, speed);

    return control_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