Macro-Based Register Config Helper

Code

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

#define BIT_ENABLE(val)   ((val & 0x01) << 0)  
#define BIT_MODE(val)     ((val & 0x03) << 1)  
#define BIT_SPEED(val)    ((val & 0x07) << 3)
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result = BIT_ENABLE(enable) | BIT_MODE(mode) | BIT_SPEED(speed);
    return result;

}

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