#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

unsigned char mask[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
unsigned char *pmask[]={".......*","......*.",".....*..","....*...","...*....","..*.....",".*......","*......."};

unsigned char port;
unsigned char i;

int main()
{

        while (1)
        {
                printf("%s\r\n",pmask[i&7]); // portsimulation

                port=mask[i++&7];
                sleep(1);
        }
}