Extracted debounceRead to seperate file

src/commonFunctions.cpp

@@ -0,0 +1,36 @@
+#include <Arduino.h>
+#include <commonFunctions.h>
+#include <constants.h>
+
+bool debounceRead(int buttonPin, int *lastButtonState, unsigned long *lastDebounceTime, int *buttonState)
+{
+    int reading = digitalRead(buttonPin);
+
+    // If the switch changed, due to noise or pressing:
+    if (reading != *lastButtonState)
+    {
+        // reset the debouncing timer
+        *lastDebounceTime = millis();
+    }
+
+    if ((millis() - *lastDebounceTime) > DEBOUNCE_DELAY)
+    {
+        // whatever the reading is at, it's been there for longer than the debounce delay, so take it as the actual current state:
+
+        // if the button state has changed:
+        if (reading != *buttonState)
+        {
+            *buttonState = reading;
+
+            if (*buttonState == HIGH)
+                return true;
+            else
+                return false;
+        }
+    }
+
+    // save the reading. Next time through the loop, it'll be the lastButtonState:
+    *lastButtonState = reading;
+
+    return false;
+}