Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_BIT(x)      ((x & 0x01) << 0)    //Bit 0
#define MODE_BITS(x)       ((x & 0x03) << 1)    //Bits 1-2
#define SPEED_BITS(x)      ((x & 0x07) << 3)    //Bits 3-5

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