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
    uint16_t reg=0;
    reg|=(enable & 0x01)<<enable_pos;
    reg|=(mode & 0x03)<<mode_pos;
    reg|=(speed & 0x07)<<speed_pos;

    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