Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(reg,en) ((reg&0xfffe)| en)

#define SET_MODE(reg,en) ((reg&0xfff9)| (en<<1))

#define SET_SPEED(reg,en) ((reg&0xffc7)| (en<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t ret =0;
    ret = SET_ENABLE(ret,enable);
    ret = SET_MODE(ret,mode);
    ret = SET_SPEED(ret,speed);

    return ret;
}

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