Macro-Based Register Config Helper

Code

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

#define ENABLE(x) ((x & 0x01)<<0)  // Bit 0
#define MODE(x) ((x & 0x03)<<1)    //Bit 1-2
#define SPEED(x) ((x & 0x07)<<3)   //Bit 3-5

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg=0;    // Use macros to set fields
    reg |=ENABLE(enable);
    reg |=MODE(mode);
    reg |=SPEED(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