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LUFA (Lightweight USB For AVRs) on the Arduino!
Modern Arduinos (Arduino Leonardo, Arduino Micro, Arduino Esplora, Arduino Lilypad USB, and the Upcoming Arduino Tre) came with a ATmega32u4 which have a native USB interface on the MCU. The Arduino IDE also came with a tiny USB stack that has a USB CDC Serial, a Keyboard, and a Mouse. It might be enough if you're migrating old projects (form ATmega168/328's) to the new hardware, but when you want to unleash the full power of it, you'd find that the current implementations lasks extensibility (BADLY!).
Thus, I managed to bring the powerful LUFA to Arduino!
As LUFA requires changes to the Arduino core files, it is installed as custom boards.
In the Arduino IDE, go to File > Preferences, and in Additional Boards Manager URLs add the following entry : https://github.com/Palatis/Arduino-Lufa/raw/master/package_arduino-lufa_index.json
Restart Arduino IDE, and you should be able to find Arduino LUFA AVR Boards in the Tools > Board > Boards Manager
Click on install, and Arduino LUFA AVR Boards should now appear as a submenu in Tools > Board
While not recommended, it is still possible to use the legacy installation method.
To test Arduino-Lufa, select your board type from the Tools > Board > Arduino LUFA AVR Boards, and open the File > Examples > Exemple for this board > Arduino-LUFA > LUFA_DualVirtualSerial example.
Click Verify.
(Note: only atmega32u4 based boards are marked as compatible and will appear, if you are using another board which should be compatible please open an issue. Also see Note on Upload below)
To use Arduino-Lufa, select a LUFA board and add #include <LUFA.h> to your sketch header.
By uploading this sketch to the board, you will prevent the Arduino IDE from automatically reset the board before uploading another sketch. This is normally done by setting up a seial connection with 1200 baud, connecting, then disconnecting.
You can, however, manually reset the board by pressing the hardware reset button when the upload starts. To better see this, enable "Show verbose output during upload" in your preferences and wait until the IDE repatedly prompts something like this:
PORTS {COM1, COM5, COM6, } / {COM1, COM5, COM6, } => {}
If done correctly, the LED on pin 13 will begin flashing and you'll see the upload progressing in the console.
This is not permanent, however. To go back to the original state, upload a sketch compiled without Arduino-Lufa, as explained below.
If you need to compile sketches that use the Arduino Core USB Stack, you'll need to select the board type from
the Tools > Board > Arduino AVR Boards submenu.
Refer to legacy installation document if you previously installed using the legacy method and wish to deactivate Arduino-Lufa
- Victor Tseng: palatis AT gmail DOT com (Original Author)
- Daniel Korgel (Contributor)
- Felix Uhl (Contributor)
- CrazyRedMachine (Contributor)
- Arduino: http://arduino.cc
- LUFA: http://www.fourwalledcubicle.com/LUFA.php
The MIT License (MIT)
Copyright (c) 2014, Victor Tseng
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