Extract Packet Fields from Byte Stream

Code

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

typedef struct {
    uint8_t start;
    uint8_t command;
    uint16_t data;
    uint8_t crc;
    uint8_t end;
} Packet;

typedef union 
{
    Packet p;
    uint8_t buffer[6];
}up;

void print_packet_fields(uint8_t *buffer) {
    up mc;

    for(int i=0;i<6; i++)
        mc.buffer[i] = buffer[i];

    printf("Start: %d\n",(int)mc.p.start);
    printf("Command: %d\n",(int)mc.p.command);
    printf("Data: %d\n",(int)mc.p.data);
    printf("CRC: %d\n",(int)mc.p.crc);
    printf("End: %d",(int)mc.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