USB to USB keyboard protocol converter
======================================
Hardware requirement
--------------------
Arduino Leonardo
http://arduino.cc/en/Main/ArduinoBoardLeonardo
Circuit@Home USB Host Shield 2.0
http://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino
Build firmware
--------------
$ 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.
Resource
--------
http://deskthority.net/workshop-f7/is-remapping-a-usb-keyboard-using-teensy-possible-t2841.html
https://github.com/felis/USB_Host_Shield_2.0
https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}
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