Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENBL_POS    0
#define MODE_POS    1
#define SPEED_POS   3
#define RSVD_POS    6

#define ENBL_OP(x)  (x << ENBL_POS)
#define MODE_OP(x)  (x << MODE_POS)
#define SPEED_OP(x) (x << SPEED_POS)

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

    reg |= ENBL_OP(enable) | MODE_OP(mode) | SPEED_OP(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