Notes On Integrating AVRUSB with Arduino
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* Note the license(s) under which AVRUSB is distributed.

* See also: http://code.rancidbacon.com/ProjectLogArduinoUSB

* Note: The pins we use on the hardware shield are:

     INT0 == PD2 == IC Pin 4 == Arduino Digital Pin 2

     INT1 == PD3 == IC Pin 5 == Arduino Digital Pin 3

  (TODO: Change to not use PD3 so INT1 is left free?)

* In order to compile a valid 'usbconfig.h' file must exit. The content of this
  file will vary depending on whether the device is a generic USB device,
  generic HID device or specific class of HID device for example.

  The file 'usbconfig-prototype.h' can be used as a starting point, however
  it might be easier to use the 'usbconfig.h' from one of the example projects.

  TODO: Specify the settings that need to be changed to match the shield
        design we use.

* (NOTE: Initial 'usbconfig.h' used will be based on the file from
 'HIDKeys.2007-03-29'.)

* At present the IDE won't compile our library so it needs to be pre-compiled
  with:

    avr-g++  -Wall -Os -I. -DUSB_CFG_CLOCK_KHZ=16000  -mmcu=atmega168  -c usbdrvasm.S  -c usbdrv.c