#include <Arduino.h>

SAMDTimer BuzzerTimer(TIMER_TC5);
bool attached = false;

void initBuzzer() {
  pinMode(BUZZER_PIN, OUTPUT);
}

volatile bool buzzing = false;
void buzzerISR() {
  digitalWrite(BUZZER_PIN, buzzing ? LOW : HIGH);
  buzzing = !buzzing;
  //digitalToggle(BUZZER_PIN);
}

void buzz() {
  if (attached)
    BuzzerTimer.enableTimer();
  else
    BuzzerTimer.attachInterrupt(BUZZER_FREQ *2, buzzerISR);
}

void noBuzz() {
  BuzzerTimer.disableTimer();
}

/*
// https://forum.arduino.cc/t/adding-a-toggle-function-to-wiring-digital-c/975608
void digitalToggle(uint8_t pin) {
  uint8_t timer = digitalPinToTimer(pin);
  uint8_t bit = digitalPinToBitMask(pin);
  uint8_t port = digitalPinToPort(pin);
  volatile uint8_t *out;
  
  if (port == NOT_A_PIN) return;
  if (timer != NOT_ON_TIMER) turnOffPWM(timer);
  
  out = portOutputRegister(port);
  
  uint8_t oldSREG = SREG;
  cli();
  *out ^= bit;
  SREG = oldSREG;
}
*/