I've got a USB MIDI device driver working for the UNO's atmega8u2.  Just flash it onto the atmega8u2 using dfu-programmer or flip and your UNO becomes a USB MIDI device.  I've tested it with GarageBand and it seems to be working well.

Details, firmware hex files, source, and an example sketch are available from http://hunt.net.nz/users/darran/.

Cheers,
Darran.

I have a simple Mouse HID driver working on the Arduino UNO which lets it behave like a USB mouse device.

I've posted details, source, firmware hex file, and example sketch here: http://hunt.net.nz/users/darran/blog/

Cheers,
Darran.

Hi Henry,

if you add the following LUFA_OPTS to your make file you can save 196 bytes:
-D NO_DEVICE_SELF_POWER -D NO_DEVICE_REMOTE_WAKEUP -D NO_INTERNAL_SERIAL

I did search through the LUFA source to see if there were any obvious ways to reduce the code size but I didn't have much luck.  All of the unused code is automatically stripped out so what is left is just the essentials.

Hope that helps.

Cheers,
Darran.

Hi Henry,

I've done the same thing to build Keyboard HID firmware for the UNO, and found it was very tight on space.  (See details and source here: http://hunt.net.nz/users/darran/blog/).

I was able to claim some space back from LUFA by adding the following LUFA_OPTs:
 -D NO_DEVICE_SELF_POWER -D NO_DEVICE_REMOTE_WAKEUP -D NO_INTERNAL_SERIAL.

Hope that helps.

Cheers,
Darran.

If you have an UNO or a new Mega2560 then you can reprogram the atmega8u2 on it to be a USB Keyboard HID device.  This makes the Arduino appear to be a keyboard.  I've put details, source, firmware hex files, and a demo "hello world" sketch here: http://hunt.net.nz/users/darran/

Note that you can't upload sketches while its running the keyboard firmware, you have to flash back the Arduino-usbserial.hex firmware whenever you want to change the sketch.

Cheers,
Darran.

I think you should be able to program the mega2560 to be a USB keyboard, I've done it for the UNO without problems.  I've built firmware for the mega2560 that should do the job (i.e. make it appear to be a USB keyboard), please try it out and let me know how it goes.

Details, firmware source, hex files, and demo sketch here: Arduino Hacking Blog

Cheers,
Darran.

Updated to version 0.2 that removes the need for a delay between key presses.  New firmware, source, and demo sketch available from Arduino Hacking

I've got a simple Keyboard HID driver working for the UNO's atmega8u2 which lets the UNO behave as a keyboard.  It still needs some work, but seems to work well.

I've posted the details, source, and hex file here http://hunt.net.nz/users/darran for anyone that's interested.  The same approach should work for creating other USB device drivers (e.g. mouse, joystick, etc).

Cheers,
Darran.

Never mind - I've realised that my main problem is that the keyboard HID firmware is bigger than 4K (its currently 4322 bytes), which is why dfu-programmer complains that "Bootloader and code overlap" when I try to flash it to the atmega8u2.  I'll have to try and find some code to throw out of LUFA to reduce the size.

Cheers,
Darran.

Does anyone know how to build the UNO-dfu_and_usbserial_combined.hex file from arduino-usbdfu and arduino-usbserial?  The readme says these are build from the hex files somehow but doesn't specify how.

I've built a keyboard HID driver for the atmega8u2 on the UNO and I want to try it out, but I can't figure out how to combine it with the arduino-usbdfu hex.

Cheers,
Darran.