Macro-Based Register Config Helper

Code

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

// Define macros here
#define MACRO(X, Y, pos) (X |= (Y << pos));

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t ram = 0;
    MACRO(ram, enable, 0);
    MACRO(ram, mode, 1);
    MACRO(ram, speed, 3);

    if((ram & 0b11000000) == 0) {
        return ram;
    }
    else{
        printf("ERROR");
    }
}

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