Macro-Based Register Config Helper

Code

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

// Define macros here

#define SET_ENABLE(val)   ((val & 0x1) << 0)
#define SET_MODE(val)     ((val & 0x3) << 1)
#define SET_SPEED(val)    ((val & 0x7) << 3)


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