Macro-Based Register Config Helper

Code

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

#define ENABLE(x)   (((uint16_t)((x) & 0x01U)) << 0)
#define MODE(x)     (((uint16_t)((x) & 0x03U)) << 1)
#define SPEED(x)    (((uint16_t)((x) & 0x07U)) << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed)
{
    uint16_t reg = 0;
    reg |= ENABLE(enable);
    reg |= MODE(mode);
    reg |= SPEED(speed);
    return reg;
}

int main(void)
{
    uint8_t enable, mode, speed;
    scanf("%hhu %hhu %hhu", &enable, &mode, &speed);

    uint16_t reg = build_register(enable, mode, speed);
    printf("%u\n", reg);

    return 0;
}

Solving Approach