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qmk_firmware/keyboards/converter/usb_usb/README.md

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USB to USB keyboard protocol converter

A small device to connect between your USB keyboard and your PC that makes (almost) every keyboard fully programmable. Original code from the TMK firmware. Ported to QMK by Balz Guenat.

Keyboard Maintainer: Balz Guenat Hardware Supported: Hasu's USB-USB converter, Pro Micro + USB Host Shield, maybe more Hardware Availability: GH thread, self-built

Make example for this keyboard (after setting up your build environment):

make converter-usb_usb-default

See build environment setup then the make instructions for more information.

Getting the Hardware

There are two options to get a converter: You can buy one from Hasu or build one yourself.

Buy a Converter

You can buy a fully assembled converter from me here: https://geekhack.org/index.php?topic=69169.0

Build one yourself using Arduino Leonardo + Circuit@Home USB Host Shield 2.0

Buying Arduino Leonardo and USB Host Shield 2.0(from Circuit@home) will be better, you won't need even soldering iron. http://arduino.cc/en/Main/ArduinoBoardLeonardo https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino-assembled/

Other compatible boards like 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. Build guide 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

Limitations

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.

Resources

Hasu's main thread for the converter https://geekhack.org/index.php?topic=69169.0 Build guide for the Pro Micro variant https://geekhack.org/index.php?topic=80421.0 Original TMK version of the converter https://github.com/tmk/tmk_keyboard/tree/master/converter/usb_usb USB Host Shield 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 Shield 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