Macro-Based Register Config Helper

Code

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


// Define macros here
#define SET_FIELD(value, mask, shift) ((value&mask) << shift)

#define SET_ENABLE(x) SET_FIELD(x, 0x01 ,0)
#define SET_MODE(x) SET_FIELD(x, 0x03, 1)
#define SET_SPEED(x) SET_FIELD(x, 0x07, 3)

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

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