Macro-Based Register Config Helper

Code

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

#define ENABLE(reg,val)(reg |= val)
#define MODE(reg,val)(reg |= val<< 1)
#define SPEED(reg,val)(reg |= val<<3 )
#define RESERVED(reg)(reg &= ~(64<<6))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;
    ENABLE(reg,enable);
    MODE(reg,mode);
    SPEED(reg,speed);
    RESERVED(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