tmk_keyboard/converter/usb_usb

USB to USB keyboard protocol converter

See this for detail and discussion here.

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

See this for TMK general info.

• https://github.com/tmk/tmk_keyboard/wiki

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/products/arduino-leonardo-with-headers
• https://docs.arduino.cc/retired/shields/arduino-usb-host-shield
• https://www.sparkfun.com/products/9947

Build firmware

See wiki.

https://github.com/tmk/tmk_keyboard/wiki#build-firmware

Keymap Editor

You can editor keymap and download firmware with web browser.

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

Limitation

The converter supports 'HID Boot protocol' only. This means it can host only standard USB keyboard(6KRO).

• Media/System control keys are not recognized.
• 'Fn' key itself cannot be remapped.

Many of NKRO keyboards still can work with the converter in 6KRO mode.