Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENBALE_BIT(x)       (x)
#define MODE_BIT(x)         (x << 1)
#define SPEED_BIT(x)        (x << 3)
#define RESERVED_BIT     ~(0x03 << 6)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    reg |= ENBALE_BIT(enable);
    reg |= MODE_BIT(mode);
    reg |= SPEED_BIT(speed);
    reg &= RESERVED_BIT;
    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