int main()
{
  
  volatile char *dir;
  dir = 0x30;
  *dir = 0xFF;

  dir = 0x107;
  *dir = 0XFF;

  volatile unsigned char *green;
  green = 0x31;

  volatile unsigned char *blue;
  blue = 0x108;

  while(1)
  {

    for(volatile char j = 0;j<8;j++)
    {
      
      *blue = ~(0x80>>j); //while annode is swithced off cathode needs to be changed
      *green = 0x80>>j;

      for(volatile long i = 0; i<100;i++);
      
      *green = 0x00; //annode needs to be switched off
      
    }
  

  }

}