Macro-Based Register Config Helper

Code

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

// Define macros here
#define REG_ENABLE(x)   ((x & 0x1) << 0)
#define REG_MODE(x)     ((x & 0x3) << 1)
#define REG_SPEED(x)    ((x & 0x7) << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    return ( REG_ENABLE(enable) | REG_MODE(mode) | REG_SPEED(speed) );
}

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