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;
 volatile long i;
  out =0x108;
  *out = 0x01;
  out = 0x31;
  *out = 0x01;
  for (i=0; i<100000;i++);
 out =0x108;
  *out = 0x02;
  out = 0x31;
  *out = 0x01;
  for (i=0; i<100000;i++);
}