Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(r, enable)  ((r) |= ((enable) << 0))
#define MODE(r, mode)      ((r) |= ((mode) << 1))
#define SPEED(r, speed)    ((r) |= ((speed) << 3))
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    // printf("%u\n", reg);
    ENABLE(reg,enable);
    // printf("%u\n", reg);
    MODE(reg, mode);
    // printf("%u\n", reg);
    SPEED(reg, speed);
    // printf("%u\n", reg);
    reg &= ~(1 << 6);
    reg &= ~(1 << 7);
    // printf("%u\n", 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