Macro-Based Register Config Helper

Code

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

// Define macros here
uint8_t enable_mask = 0b1;
uint8_t mode_mask = 0b11;
uint8_t speed_mask = 0b111;
uint8_t reserved_mask = 0b11;


#define ENABLE(x)    ((x & enable_mask)  << 0)
#define MODE(x)      ((x & mode_mask)    << 1)
#define SPEED(x)     ((x & speed_mask)   << 3)  
#define RESERVED(x)  ((x & reserved_mask)<< 6) 

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint8_t res = 0;
    res |= ENABLE(enable);
    res |= MODE(mode);
    res |= 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