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

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *cath;
  volatile long i;

  cath = (char *)0x108;
  *cath = 0x01;

  cath = (char *)0x31;
  *cath = 0x01;

  for (i = 0; i < 100000; i++);

  cath = (char *)0x108;
  *cath = 0x02;

  cath = (char *)0x31;
  *cath = 0x01;
  for (i = 0; i < 50000; i++);
  
}