Add Mouse driver from wwatson

https://forum.pjrc.com/threads/45740-USB-Host-Mouse-Driver

USBHost_t36.h

 	Transfer_t mytransfers[7] __attribute__ ((aligned(32)));
 };
 
+class MouseController : public USBDriver {
+public:
+	MouseController(USBHost &host) { init(); }
+	MouseController(USBHost *host) { init(); }
+	bool	available() { return mouseEvent; }
+	void	mouseDataClear();
+	uint8_t  getButtons() { return buttons; }
+	int8_t  getMouseX() { return mouseX; }
+	int8_t  getMouseY() { return mouseY; }
+	int8_t  getWheel() { return wheel; }
+protected:
+	virtual bool claim(Device_t *device, int type, const uint8_t *descriptors, uint32_t len);
+	virtual void control(const Transfer_t *transfer);
+	virtual void disconnect();
+	static void callback(const Transfer_t *transfer);
+	void new_data(const Transfer_t *transfer);
+	void init();
+private:
+	void update();
+	Pipe_t *datapipe;
+	setup_t setup;
+	uint32_t packetSize;
+	uint8_t buttons;
+	int8_t mouseX;
+	int8_t mouseY;
+	int8_t wheel;
+	bool mouseEvent = false;
+	uint8_t report[20]; // Set to largest packet size 20 bytes
+	uint8_t prev_report[20]; // Same as above
+	Pipe_t mypipes[2] __attribute__ ((aligned(32)));
+	Transfer_t mytransfers[4] __attribute__ ((aligned(32)));
+};
+
 #endif

examples/Mouse/Mouse.ino

+// Simple test of USB Host Mouse/Keyboard
+//
+// This example is in the public domain
+
+#include "USBHost_t36.h"
+
+USBHost myusb;
+USBHub hub1(myusb);
+USBHub hub2(myusb);
+USBHub hub3(myusb);
+KeyboardController keyboard1(myusb);
+KeyboardController keyboard2(myusb);
+MouseController mouse1(myusb);
+
+void setup()
+{
+	while (!Serial) ; // wait for Arduino Serial Monitor
+	Serial.println("USB Host Testing");
+	myusb.begin();
+	keyboard1.attachPress(OnPress);
+	keyboard2.attachPress(OnPress);
+}
+
+
+void loop()
+{
+	myusb.Task();
+  if(mouse1.available()) {
+    Serial.print("buttons = ");
+    Serial.print(mouse1.getButtons(),DEC);
+    Serial.print(",  wheel = ");
+    Serial.print(mouse1.getWheel(),DEC);
+    Serial.print(",  mouseX = ");
+    Serial.print(mouse1.getMouseX(),DEC);
+    Serial.print(",  mouseY = ");
+    Serial.println(mouse1.getMouseY(),DEC);
+    mouse1.mouseDataClear();
+  }
+  delay(50);
+}
+
+
+void OnPress(int key)
+{
+	Serial.print("key '");
+	Serial.print((char)key);
+	Serial.print("'  ");
+	Serial.println(key);
+	//Serial.print("key ");
+	//Serial.print((char)keyboard1.getKey());
+	//Serial.print("  ");
+	//Serial.print((char)keyboard2.getKey());
+	//Serial.println();
+}
+

keywords.txt

 USBHost	KEYWORD1
 USBHub	KEYWORD1
 KeyboardController	KEYWORD1
+MouseController	KEYWORD1
 MIDIDevice	KEYWORD1
 Task	KEYWORD2
 getKey	KEYWORD2
 getOemKey	KEYWORD2
 attachPress	KEYWORD2
 attachRelease	KEYWORD2
+getButtons	KEYWORD2
+getWheel	KEYWORD2
+getMouseX	KEYWORD2
+getMouseY	KEYWORD2