Macro-Based Register Config Helper

Code

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

// Define macros here

#define Set_enable(x) ((x & 0x01) << 0) // bit 0
#define Set_mode(x) ((x & 0x03) << 1) // Bits 1-2
#define Set_speed(x) ((x & 0x07) << 3) // bit 3-5
// reserved bit 6-7 left 0


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

    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