void setup() {
  // put your setup code here, to run once:
   volatile char *dir;
   dir = 0x30;
   *dir = 0xFF; 
   
   dir = 0x107;
   *dir = 0xFF;
}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *out;
  out = 0x108;
  *out = 0x01;  //try 0x03 or 0b00000011 //try 0x02

  out = 0x31;
  *out = 0x01;

}