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USB to USB keyboard protocol converter
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Hardware requirement
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--------------------
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Arduino Leonardo
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http://arduino.cc/en/Main/ArduinoBoardLeonardo
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Circuit@Home USB Host Shield 2.0
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http://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino
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Build firmware
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--------------
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$ git clone git://github.com/tmk/tmk_keyboard.git
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$ cd tmk_keyboard
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$ git submodule init
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$ git submodule update
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$ cd converter/usb_usb
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$ make
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Program converter. Push reset button on Leonardo before run this command. Serial port name(COM17) depends your system. On Linux I got /dev/ttyACM0.
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$ DEV=COM17 make program
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or
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$ avrdude -patmega32u4 -cavr109 -b57600 -Uflash:w:usb_usb.hex -PCOM17
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Limitation
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Only supports 'HID Boot protocol'.
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Not support keyboard LED yet.
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Resource
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--------
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http://deskthority.net/workshop-f7/is-remapping-a-usb-keyboard-using-teensy-possible-t2841.html
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https://github.com/felis/USB_Host_Shield_2.0
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https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}
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