Pack Multiple Fields into a 16-bit Control Register

Code

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

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    uint16_t output = 0; 
    
    uint16_t mode_mask = 0x07; 
    uint16_t speed_mask = 0x1F; 
    uint16_t status_mask = 0x3F; 

    output |= (mode & mode_mask); 
    output |= (speed & speed_mask) << 3; 
    output |= (status & status_mask) << 10; 

    return output;
}

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