USB_Host_Shield_2.0/examples/HID/USBHIDJoystick/USBHIDJoystick.ino

#include <usbhid.h>
#include <hiduniversal.h>
#include <usbhub.h>

// Satisfy IDE, which only needs to see the include statment in the ino.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#include <SPI.h>
#endif

#include "hidjoystickrptparser.h"

USBHost usb;
USBHub Hub(&usb);
HIDUniversal Hid(&usb);
JoystickEvents JoyEvents;
JoystickReportParser Joy(&JoyEvents);

void setup() {
  Serial.begin(115200);
#if !defined(__MIPSEL__)
  while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
  Serial.println("Start");

  if (usb.Init() == -1)
    Serial.println("OSC did not start.");

  delay(200);

  if (!Hid.SetReportParser(0, &Joy))
    ErrorMessage<uint8_t > (PSTR("SetReportParser"), 1);
}

void loop() {
  usb.Task();
}