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 ret_val = 0;
    
    if (mode > 7) mode = 7;         // 3 bits max
    if (speed > 31) speed = 31;     // 5 bits max
    if (status > 63) status = 63;   // 6 bits max

    ret_val |= (mode & 0x07) << 0;
    ret_val |= (speed & 0x1f) << 3;
    ret_val |= (status & 0x3f) << 10;
    return ret_val;
}

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