Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_EN(r, n) (r |= ((n & 0b01) << 0))
#define SET_MODE(r, n) (r |= ((n & 0b11) << 1))
#define SET_SPEED(r, n) (r |= ((n & 0b111) << 3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result = 0;
    
    SET_EN(result, enable);
    SET_MODE(result, mode);
    SET_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;
}

Solving Approach