Pack Multiple Fields into a 16-bit Control Register

Code

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

#define REG_MASK(mode,speed,status) (((mode & 0x07) << 0)| \
                                    ((speed & 0x1F) << 3)| \
                                    ((status & 0x3F)<<10))

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here    
    uint16_t reg;
    reg |= REG_MASK(mode,speed,status);
    return reg;
}

int main() {
    uint8_t mode, speed, status;
    scanf("%hhu %hhu %hhu", &mode, &speed, &status);

    uint16_t reg = pack_register(mode, speed, status);
    printf("%u", reg);
    return 0;
}

Solving Approach