#define Led1 PC6
#define Led2 PC13
#define Led3 PC14
void setup() {
  // put your setup code here, to run once:
  pinMode(Led1, OUTPUT);
  pinMode(Led2, OUTPUT);
  pinMode(Led3, OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(Led1, HIGH);
  digitalWrite(Led2, LOW);
  digitalWrite(Led3, LOW);
  delay(1000); 
  digitalWrite(Led1, LOW);
  digitalWrite(Led2, HIGH);
  digitalWrite(Led3, LOW);
  delay(1000); 
  digitalWrite(Led1, LOW);
  digitalWrite(Led2, LOW);
  digitalWrite(Led3, HIGH);
  delay(1000); // this speeds up the simulation
}