Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(r) ((r & 1u) << 0) //bit 0
#define SET_MODE(r)   ((r & 0x3u) << 1) //bit 1-2
#define SET_SPEED(r)  ((r & 0x7u) << 3) //bit 3-5

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

    result = SET_ENABLE(enable) | SET_MODE(mode) | SET_SPEED(speed);

    return result;
}

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