#define led_pin 13
#define btn_pin 12

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

// bool led_state=0;
int count=0;
bool btn_state=HIGH;
bool btn_prev_state=HIGH;

int btn_press_state=0;


void loop() {
  // put your main code here, to run repeatedly:
  btn_state=digitalRead(btn_pin);
  if (btn_state==LOW && btn_prev_state==HIGH){
    btn_press_state=millis();
    digitalWrite(led_pin, !digitalRead(led_pin)); // Toggle the led
    count++;
    Serial.print("count: ");
    Serial.println(count);
  }
  btn_prev_state=btn_state;
  // delay(10); // this speeds up the simulation
}