See for detail and discussion here.
There are two options.
You can buy a fully preassembled converter from me here.
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.
$ 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
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.
You can editor keymap and download firmware with web brwoser.
- 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