Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE_BIT(reg,val) (reg|=(val&0x01))
#define SET_MODE_BITS(reg,mode) (reg|=((mode&0x03)<<1))
#define SET_SPEED_BITS(reg,speed) (reg|=((speed&0x07)<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg=0;
    SET_ENABLE_BIT(reg,enable);
    SET_MODE_BITS(reg,mode);
    SET_SPEED_BITS(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