Macro-Based Register Config Helper

Code

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

#define BIT(X,y) X|=(0x01)&y
#define BIT1_2(X,y) X|=(0x06) & (y<<1)  
#define BIT3_5(X,y) X|=(0x38) & (y<<3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg=0;
    BIT(reg,enable);
    BIT1_2(reg,mode);
    BIT3_5(reg,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