From b4b1545ace148dc55bbd8d1a9cca79cc711aed96 Mon Sep 17 00:00:00 2001
From: Vladimir Garistov <vl.garistov@gmail.com>
Date: Sun, 6 Nov 2022 19:17:10 +0200
Subject: [PATCH] Added pin chane interrupt example

---
 Examples/pin_change_demo/pin_change_demo.ino | 27 ++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Examples/pin_change_demo/pin_change_demo.ino

diff --git a/Examples/pin_change_demo/pin_change_demo.ino b/Examples/pin_change_demo/pin_change_demo.ino
new file mode 100644
index 0000000..db5f18a
--- /dev/null
+++ b/Examples/pin_change_demo/pin_change_demo.ino
@@ -0,0 +1,27 @@
+volatile bool change_detected = false;
+
+void setup()
+{
+  // put your setup code here, to run once:
+  DDRC &= ~((1 << DDC0) | (1 << DDC1) | (1 << DDC2) | (1 << DDC3));
+  PORTC |= (1 << DDC0) | (1 << DDC1) | (1 << DDC2) | (1 << DDC3);
+  PCMSK1 |= (1 << PCINT8) | (1 << PCINT9) | (1 << PCINT10) | (1 << PCINT11);
+  PCICR |= (1 << PCIE1);
+  Serial.begin(38400, SERIAL_8E2);
+}
+
+void loop()
+{
+  if (change_detected)
+  {
+    delay(100);
+    Serial.print("Switch changed: ");
+    Serial.println(PINC & ((1 << PINC0) | (1 << PINC1) | (1 << PINC2) | (1 << PINC3)), BIN);
+    change_detected = false;
+  }
+}
+
+ISR(PCINT1_vect)
+{
+  change_detected = true;
+}
-- 
2.39.2