source: rtos_arduino/trunk/arduino_lib/hardware/arduino/samd/cores/validation/validation_usb_device/test_usb_device.cpp@ 136

/*
  Copyright (c) 2012 Arduino.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#define ARDUINO_MAIN
#include "Arduino.h" 

#ifdef HID_ENABLED
        const int buttonPin = 4;          // input pin for pushbutton
        int previousButtonState = HIGH;   // for checking the state of a pushButton
        int counter = 0;                  // button push counter
#endif

void setup(void)
{       
#ifdef HID_ENABLED
        Mouse.begin();

        // make the pushButton pin an input:
        pinMode(buttonPin, INPUT);
        // initialize control over the keyboard:
        Keyboard.begin();
#endif

#ifdef CDC_ENABLED
        SerialUSB.begin(115200);
#endif
}


void loop(void)
{
#ifdef HID_ENABLED
        Mouse.move(1, 0, 0);

        // read the pushbutton:
        int buttonState = digitalRead(buttonPin);
        // if the button state has changed, and it's currently pressed:
        if ((buttonState != previousButtonState) && (buttonState == HIGH))
        {
                // increment the button counter
                counter++;
                // type out a message
                Keyboard.print("You pressed the button ");
                Keyboard.print(counter);
                Keyboard.println(" times.");
        }
        // save the current button state for comparison next time:
        previousButtonState = buttonState;
#endif

#ifdef CDC_ENABLED
        if (SerialUSB.available() > 0)
        {
                char inChar;
                while( -1 == (inChar = SerialUSB.read()));
                SerialUSB.print(inChar);
        }

        delay(10);
#endif
}