From f8878d3c37b910d7973d3a35de673f5c141f0223 Mon Sep 17 00:00:00 2001
From: cryptogopher <git6453hub@michalczyk.pro>
Date: Sun, 9 Oct 2022 20:34:25 +0200
Subject: [PATCH] Replace tone() with custom timer

---
 button.ino   |  2 ++
 metronom.ino | 38 ++++++++++++++++++++++++++++----------
 2 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/button.ino b/button.ino
index e90ac79..a29d8c5 100644
--- a/button.ino
+++ b/button.ino
@@ -1,5 +1,7 @@
 volatile unsigned long lastButtonPress = millis();
 
+// Debouncing na timerze:
+// https://github.com/khoih-prog/TimerInterrupt/blob/master/examples/SwitchDebounce/SwitchDebounce.ino
 void initButton() {
   pinMode(BUTTON_PIN, INPUT_PULLUP);
   // Order of ISRs matter: RISING should be invoked first
diff --git a/metronom.ino b/metronom.ino
index 733347e..fb853f9 100644
--- a/metronom.ino
+++ b/metronom.ino
@@ -1,15 +1,16 @@
 #include "SAMDTimerInterrupt.h"
 #include "SAMD_ISR_Timer.h"
 
-#define HW_TIMER_INTERVAL_MS 10
-SAMDTimer ITimer(TIMER_TC3);
-SAMD_ISR_Timer ISR_Timer;
+SAMDTimer TaskTimer(TIMER_TC3);
+SAMDTimer BuzzerTimer(TIMER_TC5);
+SAMD_ISR_Timer TasksISRs;
 
-void TimerHandler(void) { ISR_Timer.run(); }
+void TasksHandler(void) { TasksISRs.run(); }
 
 
 const int COUNTDOWN = 240;
 const int PERIOD_MS = 1000;
+const int BUZZER_FREQ = 300;
 
 const uint BUTTON_PIN = 6;
 const uint BUTTON_LED_PIN = 5;
@@ -28,10 +29,25 @@ void setup() {
   initTemperature();
   initTube();
 
-  ITimer.attachInterruptInterval_MS(10, TimerHandler);
-  ISR_Timer.setInterval(PERIOD_MS, runMetronome);
-  ISR_Timer.setInterval(PERIOD_MS, readTemperature);
-  ISR_Timer.setInterval(PERIOD_MS, updateTube);
+  pinMode(BUZZER_PIN, OUTPUT);
+  BuzzerTimer.attachInterrupt(BUZZER_FREQ *2, buzz);
+  BuzzerTimer.disableTimer();
+
+  TaskTimer.attachInterruptInterval_MS(25, TasksHandler);
+  TasksISRs.setInterval(PERIOD_MS, runMetronome);
+  TasksISRs.setInterval(PERIOD_MS, readTemperature);
+  TasksISRs.setInterval(PERIOD_MS, updateTube);
+}
+
+volatile bool buzzing = false;
+void buzz() {
+  digitalWrite(BUZZER_PIN, buzzing ? LOW : HIGH);
+  buzzing = !buzzing;
+}
+
+void stopBuzzer() {
+  BuzzerTimer.disableTimer();
+  digitalWrite(BUZZER_PIN, LOW);
 }
 
 void runMetronome() {
@@ -40,8 +56,10 @@ void runMetronome() {
 
     digitalWrite(BUTTON_LED_PIN, countdown % 2 ? HIGH : LOW);
   } else if (countdown == 0) {
-    //tone(BUZZER_PIN, 300, 100);
+    TasksISRs.setTimeout(100, stopBuzzer);
+    BuzzerTimer.enableTimer();
   }
 }
 
-void loop() {}
+void loop() {
+}