Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_BITS(reg, enable)  (reg |= ((enable&0x01)<<0))
#define MODE_BITS(reg, mode)      (reg |= ((mode&0x0B)<<1))
#define SPEED_BITS(reg, speed)    (reg |= ((speed&0x6F)<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t output = 0x00;
    ENABLE_BITS(output, enable);
    MODE_BITS(output,mode);
    SPEED_BITS(output, speed);
    return output;
}

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