Macro-Based Register Config Helper

Code

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

// Field-setting macros
#define SET_BIT(e) (((e) & 0x01) << 0)  // Bits 0
#define MODE_BIT(m) (((m) & 0x03) <<1)  // Bits 1-2
#define SPEED_BIT(s) (((s) & 0x07) << 3) //bits 3-5
// Reserved bits 6–7 left 0

// Build register using macros
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;
    reg |= SET_BIT(enable);
    reg |= MODE_BIT(mode);
    reg |= SPEED_BIT(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