void setup()
{
    volatile unsigned char *dir;

    dir = (volatile unsigned char *)0x30; 
    *dir = 0xFF;                          
}

void loop()
{
    volatile unsigned char *out;

    out = (volatile unsigned char *)0x31;  

    while(1)
    {
        *out = 0x80;    
  
        *out = 0x10;
       
        *out = 0x08;    
       
        *out = 0x02;    

        
    }
}