Interrupt Blinky Arduino Sketch for Maple Leaf Mini STM32

InterruptBlinky.ino

/*
 * This is an Interrupt Button Test for Maple Leaf Min STM32
 */

#define BOARD_BUTTON_PIN 32
#define BOARD_LED_PIN 33

volatile byte led_state = 0;

void interruptFunction() {
  if (!led_state) led_state = 1;
}


void setup() {
  pinMode(BOARD_BUTTON_PIN, INPUT);
  pinMode(BOARD_LED_PIN, OUTPUT);
  
  // put your setup code here, to run once:
  attachInterrupt(BOARD_BUTTON_PIN, interruptFunction, RISING);
}

void loop() {
  delay(200);
  digitalWrite(BOARD_LED_PIN, led_state);
  led_state = 0;
}