Macro-Based Register Config Helper

Code

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

// Define macros here

#define ENABLE_POS 0
#define MODE_POS 1
#define SPEED_POS 3

#define SET_ENABLE(x) ((uint16_t)((x & 0x1) << ENABLE_POS))
#define SET_MODE(x) ((uint16_t)((x & 0x3) << MODE_POS))
#define SET_SPEED(x) ((uint16_t)((x & 0x7) << SPEED_POS))

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

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