feat: add MultiTouch Polling example

Author: aliphys

examples/MultiTouchBlink_Polling/MultiTouchBlink_Polling.ino

@@ -0,0 +1,62 @@
+/* 
+ * MultiTouchBlink_Polling.ino
+ * 
+ * This example shows how to visualise the number of touch points, using the RGB LED. 
+ * 
+ * On each iteration of the loop, the touch points are obtained from the GT911 controller. If the touch points exist, then a message
+ * is sent to the Serial, and the LED is blinked the corresponding number of times. A 1 second delay is given after a touch is detected, to
+ * act as a basic debounce utility.  
+ *  
+ * For the interrupt 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 setup() {
+  Serial.begin(115200);
+  while (!Serial) {}
+
+  if (touchDetector.begin()) {
+    Serial.println("Touch controller init - OK");
+  } else {
+    Serial.println("Touch controller init - FAILED");
+    while (1)
+      ;
+  }
+}
+
+void loop() {
+  uint8_t contacts;
+  GDTpoint_t points[5];
+  contactPoints = 0;
+
+  contactPoints = touchDetector.getTouchPoints(points);
+
+  if (contactPoints > 0) {
+    Serial.println("Contact Detected! Will Blink " + String(contactPoints) + " times!");
+    for (int i = 1; i <= contactPoints; i++) {
+      digitalWrite(LED_BUILTIN, LOW);
+      delay(250);
+      digitalWrite(LED_BUILTIN, HIGH);
+      delay(250);
+    }
+
+    delay(1000);
+  }
+
+  delay(1);
+}