Macro-Based Register Config Helper

Code

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

// Define macros here
#define enBit(bit)       (bit & 0x01)
#define modeBit(bit)        ((bit & 0x03) << 1)
#define speedBit(bit)       ((bit & 0x07) << 3)

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

    reg |= enBit(enable) ;
    reg |= modeBit(mode) ;
    reg |= speedBit(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