#define LED_PIN  PC15
#define BUTTON_PIN PA1

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
  pinMode(LED_PIN,OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {

  int value = digitalRead(BUTTON_PIN);
  if (value == LOW)
  digitalWrite(LED_PIN,  HIGH);
  // put your main code here, to run repeatedly:
  else
    digitalWrite(LED_PIN, LOW);
}