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) (x & 0x1)
#define SET_MODE(x) (x & 0x3)
#define SET_SPEED(x) (x & 0x7)
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t test=0;
    test = SET_ENABLE(enable) | SET_MODE(mode) << 1 | SET_SPEED(speed) << 3;
    return test;
}

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