tmk_keyboard/converter/usb_usb

USB to USB keyboard protocol converter

See for detail and discussion here.

• https://geekhack.org/index.php?topic=69169.0

Hardware requirement

There are two options.

TMK USB-USB Converter

You can buy a fully preassembled converter from me here.

• https://geekhack.org/index.php?topic=72052.0

Arduino Leonardo + USB Host Shield

Buying Arduino Leonardo and USB Host Shield.

• https://store.arduino.cc/usa/leonardo
• https://store.arduino.cc/usa/arduino-usb-host-shield
• https://www.sparkfun.com/products/9947

Build firmware

Build.

$ git clone https://github.com/tmk/tmk_keyboard.git
$ cd tmk_keyboard
$ git submodule init
$ git submodule update
$ cd converter/usb_usb
$ make

And Program converter. Push button on TMK converter and just run this.

$ make dfu

In case of Leonardo push reset button then run 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'.

Note that the converter can host only USB "boot protocol" keyboard(6KRO), 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.

Keymap editor

You can editor keymap and download firmware with web brwoser.

• http://www.tmk-kbd.com/tmk_keyboard/editor/unimap/?usb_usb

Update

• 2014/12/11 Added Hub support(confirmed with HHKB pro2)
• 2016/09/10 Unimap editor support
• 2016/10/18 Fix LED state at startup
• 2017/05/xx Fix startup code for FC660C(3eae475)
• 2018/02/xx Add Korean and Brazilian specific keys(ab6ddac,b2fa0ffa)
• 2018/07/xx Fix startup issue(c2ce617)
• 2018/10/xx Use fixed LUFA stack and update USB_Host_Shield_2.0
• 2019/09/18 Add BTLD(bootlader jump) key to unimap

Resource

USB Host Sheild 2.0

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

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}

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