feat: add MultiTouch Interrupt example

Author: aliphys

examples/MultiTouchBlink_IRQ/MultiTouchBlink_IRQ.ino

@@ -0,0 +1,61 @@
+/* 
+ * MultiTouchBlink_IRQ.ino
+ * 
+ * This example shows how to visualise the number of touch points, using the RGB LED. 
+ * 
+ * Whenever a touch event is detected, gigaTouchHandler() records the number of touches and blinks the RGB LED accordingly.
+ * The event is also detected and sent via Serial. The touch handler is detached, blink is performed and then re-attached.
+ *  
+ * For the polling version of this example, see MultiTouchBlink_IRQ.ino
+ * 
+ * Instructions:
+ * 1. Connect your GIGA Display Shield (ASX00039) to a GIGA R1 WiFi (ABX00063) board.
+ * 2. Upload this sketch to your board.
+ * 3. Open the Serial Monitor.
+ * 4. Touch the screen with your finger(s).
+ * 5. The LED will blink, based on how many touch contact are recorded. Note that fingers need to be placed all at the same time. 
+ * 
+ * Initial author: Ali Jahangiri @aliphys
+ * Created: 12 June 2024
+ */
+
+#include "Arduino_GigaDisplayTouch.h"
+
+Arduino_GigaDisplayTouch touchDetector;
+
+int contactPoints = 0;
+
+void gigaTouchHandler(uint8_t contacts, GDTpoint_t* points) {
+  contactPoints = contacts;
+  touchDetector.end();  // close the touch controller
+}
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) {}
+
+  if (touchDetector.begin()) {
+    Serial.println("Touch controller init - OK");
+  } else {
+    Serial.println("Touch controller init - FAILED");
+    while (1);
+  }
+
+  touchDetector.onDetect(gigaTouchHandler);
+}
+
+void loop() {
+  if (contactPoints > 0) {
+    Serial.println("Contact Detected! Will Blink " + String(contactPoints) + " times!");
+    for (int i = 0; i < contactPoints; i++) {
+      digitalWrite(LED_BUILTIN, LOW);
+      delay(250);
+      digitalWrite(LED_BUILTIN, HIGH);
+      delay(250);
+    }
+    contactPoints = 0;
+    touchDetector.begin();
+    delay(100);
+    touchDetector.onDetect(gigaTouchHandler);
+  }
+}