Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_POS 0
#define MODE_POS 1
#define SPEED_POS 3 

#define SET_ENABLE(x) ((x & 0x1U)<< ENABLE_POS)
#define SET_MODE(x) ((x & 0x3U)<< MODE_POS)
#define SET_SPEED(x) ((x & 0x7U)<< SPEED_POS)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields

    uint16_t reg =0;
    reg |= SET_ENABLE(enable);
    reg |= SET_MODE(mode);
    reg |= SET_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