Extract Packet Fields from Byte Stream

Code

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

union Field {
    struct Packet {
        uint8_t start;
        uint8_t command;
        uint16_t data;
        uint8_t crc;
        uint8_t end;
    } p;
    uint8_t data[6];
};

void print_packet_fields(uint8_t *buffer) {
    Field *f = (Field *)buffer;
    printf("Start: %d\n", f->p.start);
    printf("Command: %d\n", f->p.command);
    printf("Data: %d\n", f->p.data);
    printf("CRC: %d\n", f->p.crc);
    printf("End: %d\n", f->p.end);
}

int main() {
    uint8_t buffer[6];
    for (int i = 0; i < 6; i++) {
        scanf("%hhu", &buffer[i]);
    }
    print_packet_fields(buffer);
    return 0;
}

Solving Approach