qmk_firmware/converter/usb_usb

USB to USB keyboard protocol converter

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Hardware requirement

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Arduino Leonardo

    http://arduino.cc/en/Main/ArduinoBoardLeonardo 



Circuit@Home USB Host Shield 2.0

    https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino-assembled/



Buying Arduino Leonardo and USB Host Shield 2.0(from Circuit@home) will be the easiest way, you won't need even soldering iron.

Arduino's Shield will also work well but I think Sparkfun's needs to be modified.



    http://arduino.cc/en/Main/ArduinoUSBHostShield

    https://www.sparkfun.com/products/9947



Also Pro Micro 3.3V(not Mini) or Teensy with mini host shield will work with some fixes on signal/power routing.

    https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-for-arduino-pro-mini

    https://www.sparkfun.com/products/12587

    https://www.pjrc.com/teensy/td_libs_USBHostShield.html







Build firmware

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    $ git clone git://github.com/tmk/tmk_keyboard.git

    $ cd tmk_keyboard

    $ git submodule init

    $ git submodule update

    $ cd converter/usb_usb

    $ make



Program converter. Push reset button on Leonardo before run this command. Serial port name(COM17) depends your system. On Linux I got /dev/ttyACM0.



    $ DEV=COM17 make program

    or

    $ avrdude -patmega32u4 -cavr109 -b57600 -Uflash:w:usb_usb.hex -PCOM17







Limitation

----------

Only supports 'HID Boot protocol'.

Not support keyboard LED yet.



Note that the converter can host only USB "boot protocol" keyboard(6KRO) and not NKRO, it is possible to support NKRO keyboard but you will need to write HID report parser for that. Every NKRO keyboard can have different HID report and it is difficult to support all kind of NKRO keyboards in the market.







Update

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2014/12/11  Added Hub support(confirmed with HHKB pro2)







Resource

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USB Host Sheild 2.0

    https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino

    https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-for-arduino-pro-mini

USB Host Sheild 2.0 source

    https://github.com/felis/USB_Host_Shield_2.0

Arduino USB Host Shield(with bootst converter)

    http://arduino.cc/en/Main/ArduinoUSBHostShield

Arduino source

    https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}

Initial release of TMK USB-USB converter

    https://geekhack.org/index.php?topic=33057.msg653549#msg653549

    http://deskthority.net/workshop-f7/is-remapping-a-usb-keyboard-using-teensy-possible-t2841-30.html#p74854

Arduino-based hardware keyboard remapper - Colemak forum

    http://forum.colemak.com/viewtopic.php?id=1561

Teensy + Host Shield

    http://www.pjrc.com/teensy/td_libs_USBHostShield.html