Macro-Based Register Config Helper

Code

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

// Define macros here
#define FIELD_PREP(val, pos)(val << pos)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields

    uint16_t reg = 0;
    
    reg |= FIELD_PREP(enable, 0);
    reg |= FIELD_PREP(mode, 1);
    reg |= FIELD_PREP(speed, 3);
    
    return reg;
}

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