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tmk_keyboard
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Keyboard firmwares for Atmel AVR and Cortex-M
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tmk_keyboard/converter/usb_usb
Scott Jaderholm a59dea558e usb_usb: Remove mention of downloading LUFA 9 years ago
..
Makefile Fix BOOTLOADER_SIZE setting 11 years ago
README usb_usb: Remove mention of downloading LUFA 9 years ago
config.h Fix projects for new keycodes 11 years ago
keymap.c Fix keymap to adjust new keyboard.c. 11 years ago
led.c Add USB to USB converter. unmature. 11 years ago
main.cpp changes function name keyboard_proc to keyboard_task 11 years ago
matrix.c Fix projects for new keycodes 11 years ago

README 

USB to USB keyboard protocol converter
======================================

Hardware requirement
--------------------
Arduino Leonardo
    http://arduino.cc/en/Main/ArduinoBoardLeonardo 

Circuit@Home USB Host Shield 2.0
    http://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino


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

You will get usb_usb.hex if you are lucky.
Program your Leonardo with avrdude(or easy-going Arduino IDE):

    $ avrdude -patmega32u4 -cavr109 -PCOM17 -b57600 -Uflash:w:usb_usb.hex


Limitation
----------
Only supports 'HID Boot protocol'.
Not support keyboard LED yet.