Macro-Based Register Config Helper

Code

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

#define mask_e(x) ((x & 0x01))
#define mask_m(x) ((x & 0x03) << 1)
#define mask_s(x) ((x & 0x07) << 3)


uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    reg = reg | mask_e(enable);
    reg = reg | mask_m(mode);
    reg = reg | mask_s(speed);

    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