Macro-Based Register Config Helper

Code

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

#define ENABLE(n) ((n & 0X01)<<0)
#define MODE(n) ((n & 0X03)<<1)
#define SPEED(n) ((n & 0X07)<<3)



uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg;

    reg |= ENABLE(enable)|MODE(mode)|SPEED(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