Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_MASK (0X01 << 0)
#define MODE_MASK (0X03 << 1)
#define SPEED_MASK (0X07 << 3)

#define SET_EN(REG,VAL)((REG & ~ENABLE_MASK)|((VAL & 0X01)<<0))
#define SET_MODE(REG,VAL)((REG & ~MODE_MASK)|((VAL & 0X03)<<1))
#define SET_SPEED(REG,VAL)((REG & ~SPEED_MASK)|((VAL & 0X07)<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    return (SET_EN(0,enable)|SET_MODE(0,mode)|SET_SPEED(0,speed));
}

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