Macro-Based Register Config Helper

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

// Define macros here
#define ENABLE(a, x) ((a) |= (x))
#define MODE(a, x) ((a) |= (x) << 1)
#define SPEED(a, x) ((a) |= (x) << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result = 0;
    ENABLE(result, enable);
    MODE(result, mode);
    SPEED(result, speed);
    return result;
}

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;
}