Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE (enable<<0)&0x01
#define MODE (mode<<1)&(0x03<<1)
#define SPEED (speed<<3)&(0x07<<3)
#define REVERSED 

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

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