// STM32 Blink LED on PC13 (onboard LED)

void setup() {
  pinMode(PC13, OUTPUT);  // Set PC13 as output
}

void loop() {
  digitalWrite(PC13, LOW);   // Turn LED on (active low)
  delay(500);                // Wait 500 ms
  digitalWrite(PC13, HIGH);  // Turn LED off
  delay(500);                // Wait 500 ms
}