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 ENABLE_WMASK (0x1U)
#define MODE_WMASK (0x3U)
#define SPEED_WMASK (0x7U)

#define SET_ENANLE(v) ((uint16_t)(((v) & ENABLE_WMASK) << ENABLE_POS))
#define SET_MODE(v) ((uint16_t)(((v) & MODE_WMASK) << MODE_POS))
#define SET_SPEED(v) ((uint16_t)(((v) & SPEED_WMASK) << SPEED_POS))

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

    reg |= SET_ENANLE(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