void setup() {
  //*((volatile unsigned int*)0x3FF44024) |= 0x4;
  //*((volatile unsigned int*)0x3FF44028) = 0x4;
  *((volatile unsigned int*)0x3FF44020) |= 0x4;
}

void loop() {
  //*((volatile unsigned int*)0x3FF44008) |= 0b100;
  //*((volatile unsigned int*)0x3FF44004) |= 1 << 2;
  delay(500);
  //*((volatile unsigned int*)0x3FF4400C) |= 0b100;
  //*((volatile unsigned int*)0x3FF44004) &= ~(1 << 2);
  *((volatile unsigned int*)0x3FF44004) ^= 1 << 2;
  delay(500);
}