Macro-Based Register Config Helper

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

#define BIT0        (0)
#define BIT1        (1)
#define BIT3        (3)

// Define macros here
#define SET_ENABLE_BIT(reg, val)         ((reg) |= ((val & 0x01) << BIT0))
#define SET_MODE_BIT(reg, val)           ((reg) |= ((val & 0x03) << BIT1))
#define SET_SPEED_BIT(reg, val)          ((reg) |= ((val & 0x07) << BIT3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t temp_reg = 0;
    SET_ENABLE_BIT(temp_reg, enable);
    SET_MODE_BIT(temp_reg, mode);
    SET_SPEED_BIT(temp_reg, speed);
    return temp_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;
}