Macro-Based Register Config Helper

Code

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

#define ENABLE_POS  0
#define MODE_POS    1
#define SPEED_POS   3

#define ENABLE_MASK  (1 << ENABLE_POS)
#define MODE_MASK    (0x3U << MODE_POS)
#define SPEED_MASK   (0x7U << SPEED_POS)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed)
{
    uint16_t reg = 0;

    reg |= ((enable & 0x01) << ENABLE_POS);

    reg |= ((mode & 0x03) << MODE_POS);

    reg |= ((speed & 0x07) << SPEED_POS);

    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