Macro-Based Register Config Helper

Code

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

#define  SET1(byte) ( (byte & 0x01) << 0); // 0
#define  SET2(byte) ( (byte & 0x03) << 1); // 1-2
#define  SET3(byte) ( (byte & 0x07) << 3); // 2-5
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t res = 0;
    res |= SET1(enable);
    res |= SET2(mode);
    res |= SET3(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