Macro-Based Register Config Helper

Code

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

#define ENABLE_BIT(e)   ((uint16_t)((e & 0x01) << 0))
#define MODE_FIELD(m)   ((uint16_t)((m & 0x03) << 1))
#define SPEED_FIELD(s)  ((uint16_t)((s & 0x07) << 3))

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

    reg |= ENABLE_BIT(enable);
    reg |= MODE_FIELD(mode);
    reg |= SPEED_FIELD(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