Extract buzzer to separate file

buzzer.ino

@@ -0,0 +1,46 @@
+#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;
+}
+*/