Macro-Based Register Config Helper

Code

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

// Define macros here
#define BIT(n) (1U << n)
#define ENABLE 0
#define MODE 1
#define SPEED 3



uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    reg |= (enable & 0x1)<<ENABLE;
    reg |= (mode & 0x3)<<MODE;
    reg |= (speed & 0x7)<<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