void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation
  digitalWrite(13, 1);
  delay(100);
  digitalWrite(13, 0);
  digitalWrite(12, 1);
  delay(100);
  digitalWrite(12, 0);
  digitalWrite(11, 1);
  delay(100);
  digitalWrite(11, 0);
}