Macro-Based Register Config Helper

Code

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

// Define macros here

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result = 0; 
    if (enable == 1) 
    {
        result |= (1 << 0);
    }
    int mode_mask = (1u << 2) -1;
    int mode_speed = (1u << 3) -1;
    result |= ((mode & mode_mask) << 1); // Set the new bits

    result |= ((speed & mode_speed) << 3); // Set the new bits
    
    return result;
}

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