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 ENABLE_MASK (1U << ENABLE_POS)
#define MODE_MASK (3U << MODE_POS)
#define SPEED_MASK (7U << SPEED_POS)



uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint8_t reg = 0;
    enable = enable & 0x01;
    mode = mode & 0x03;
    speed = speed & 0x07;

    reg = reg | (enable << ENABLE_POS);
    reg = reg | (mode << MODE_POS);
    reg = reg | (speed << SPEED_POS);
    reg = reg & ~(0x3U << 6);
    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