Pack Multiple Fields into a 16-bit Control Register

Firmware

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

#define MODE_MASK     0x07
#define SPEED_MASK    0x1F
#define STATUS_MASK   0x3F

#define MODE_OFFSET   0
#define SPEED_OFFSET  3
#define STATUS_OFFSET 10

#define MODE_SET(x)   (((x) & MODE_MASK)   << MODE_OFFSET)
#define SPEED_SET(x)  (((x) & SPEED_MASK)  << SPEED_OFFSET)
#define STATUS_SET(x) (((x) & STATUS_MASK) << STATUS_OFFSET)

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    return MODE_SET(mode) | SPEED_SET(speed) | STATUS_SET(status);
}

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