Macro-Based Register Config Helper

Code

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

// Define macros here
#define SetEnable(x) ((x & 0x01 ) << 0)
#define SetMode(x) ((x & 0x03) << 1 )
#define SetSpeed(x) ((x & 0x07) << 3 )

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t num = 0;
    num |= SetEnable(enable) | SetMode(mode) | SetSpeed(speed);
    return num;
}

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