Add example

Author: hreintke

libraries/ESP32/examples/GPIO/FunctionalInterrupt/FunctionalInterrupt.ino

@@ -0,0 +1,47 @@
+#include <Arduino.h>
+#include <FunctionalInterrupt.h>
+
+#define BUTTON1 16
+#define BUTTON2 17
+
+class Button
+{
+public:
+	Button(uint8_t reqPin) : PIN(reqPin){
+		pinMode(PIN, INPUT_PULLUP);
+		attachInterrupt(PIN, std::bind(&Button::isr,this), FALLING);
+	};
+	~Button() {
+		detachInterrupt(PIN);
+	}
+
+	void IRAM_ATTR isr() {
+		numberKeyPresses += 1;
+		pressed = true;
+	}
+
+	void checkPressed() {
+		if (pressed) {
+			Serial.printf("Button on pin %u has been pressed %u times\n", PIN, numberKeyPresses);
+			pressed = false;
+		}
+	}
+
+private:
+	const uint8_t PIN;
+    volatile uint32_t numberKeyPresses;
+    volatile bool pressed;
+};
+
+Button button1(BUTTON1);
+Button button2(BUTTON2);
+
+
+void setup() {
+    Serial.begin(115200);
+}
+
+void loop() {
+	button1.checkPressed();
+	button2.checkPressed();
+}