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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](https://github.com/tmk/tmk_keyboard/tree/master/converter/usb_usb). Ported to QMK by [Balz Guenat](https://github.com/BalzGuenat).
Keyboard Maintainer: [Balz Guenat](https://github.com/BalzGuenat)
Hardware Supported: [Hasu's USB-USB converter](https://geekhack.org/index.php?topic=69169.0), [Pro Micro + USB Host Shield](https://geekhack.org/index.php?topic=80421.0), maybe more
Hardware Availability: [GH thread](https://geekhack.org/index.php?topic=72052.0), self-built
Make example for this keyboard (after setting up your build environment):
make converter-usb_usb-default
See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
Troubleshooting & Known Issues
------------------------------
The Pro Micro variant runs at 8MHz, hence the following line in `usb_usb/rules.mk`:
`F_CPU ?= 8000000`
If the firmware doesn't work, try changing that line to
`F_CPU ?= 16000000`
or override the `F_CPU` variable in the `rules.mk` of your keymap.
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/arduino_usb_host_shield_projects/
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://geekhack.org/index.php?topic=80421.0)
https://www.circuitsathome.com/arduino_usb_host_shield_projects/
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/arduino_usb_host_shield_projects/
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
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
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