Macro-Based Register Config Helper

Code

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

// Define macros here
//#define ENABLE(register) ((register) |= (1<<0)); 
//#define MODE(register,mode) ((register) = ((register) & ~(0x3<<1)) | ((mode & 0x3 )<<1));
//#define SPEED(register,speed) ((register) = (register & ~(0x7<<3)) | ((speed & 0x7)<<3));
//#define RESERVED(register) (register = register & ~(0x3<<6));

#define ENABLE(enable) (((enable) & 0x1) << 0)
#define MODE(mode) (((mode) & 0x3) << 1)
#define SPEED(speed) (((speed) & 0x7) <<3)
#define RESERVED ((0<<6) | (0<<7))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t result = ENABLE(enable) | MODE(mode) | SPEED(speed) | RESERVED;
    return result;
}

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