Macro-Based Register Config Helper

Code

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

#define EN 0
#define MODE 1
#define SPEED 3
#define RES  5
// Define macros here
#define SET_ENABLE(x)   ((x & 0x01) << 0)   // Only 1 bit
#define SET_MODE(x)     ((x & 0x03) << 1)   // Only 2 bits
#define SET_SPEED(x)    ((x & 0x07) << 3)   // Only 3 bits

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg =0x00;
    reg|=SET_ENABLE(enable);
    reg|=SET_MODE(mode);
    reg|=SET_SPEED(speed);
    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