Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_POS      0U
#define MODE_POS        1U
#define SPEED_POS       3U
#define RESERVED_POS    6U
#define ENABLE_MASK     (1U << ENABLE_POS)
#define MODE_MASK       (3U << MODE_POS)
#define SPEED_MASK      (7U << SPEED_POS)
#define RESERVED_MASK   (3U << RESERVED_POS)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t regTemp = 0U;
    regTemp |= (enable << ENABLE_POS) & ENABLE_MASK;
    regTemp |= (mode << MODE_POS) & MODE_MASK;
    regTemp |= (speed << SPEED_POS) & SPEED_MASK;
    regTemp &= ~(1U << RESERVED_POS);
    return regTemp;
}

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