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qmk_firmware/converter/usb_usb
History
tmk 6f5e8ce17e usb_usb: Support locking key indicator LED 10 years ago
..
Makefile usb_usb: Support locking key indicator LED 10 years ago
README usb_usb: update README 10 years ago
config.h usb_usb: Add SpaceFn and hasu keymap 10 years ago
keymap.c usb_usb: Fix keymap 10 years ago
keymap_common.c usb_usb: Add SpaceFn and hasu keymap 10 years ago
keymap_common.h usb_usb: Add SpaceFn and hasu keymap 10 years ago
keymap_hasu.c usb_usb: Add SpaceFn and hasu keymap 10 years ago
keymap_spacefn.c usb_usb: Add SpaceFn and hasu keymap 10 years ago
main.cpp usb_usb: Support locking key indicator LED 10 years ago
matrix.c usb_usb: Update for new core layout 10 years ago

README 

USB to USB keyboard protocol converter
======================================

Hardware requirement
--------------------
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
--------------
    $ 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
------
2014/12/11  Added Hub support(confirmed with HHKB pro2)



Resource
--------
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