LUFA (2013)

LUFA (Lightweight USB Framework for AVRs, formerly known as MyUSB) is my first foray into the world of USB. It is an open-source complete USB stack for the USB-enabled Atmel AVR8 and (some of the) AVR32 microcontroller series, released under the permissive MIT License (see documentation or project source for full license details). The complete line of Atmel USB AVRs and USB AVR boards are supported by the library, as are any custom user boards, via custom board hardware drivers supplied by the user.

The Official LUFA Project Logo, by Studio Monsoon Photography

The library is currently in a stable release, suitable for download and incorporation into user projects for both host and device modes. For information about the project progression, check out my blog.

LUFA is written specifically for the free AVR-GCC compiler, and uses several GCC-only extensions to make the library API more streamlined and robust. You can download AVR-GCC for free in a convenient windows package, from the the Atmel website.

Included with the library source are many demonstration applications showing off the use of the library. Currently the library includes the following demonstration applications (most in both Low Level API and Library USB Class Driver variants):

Android Accessory Host
Audio In Device
Audio In Host
Audio Out Device
Audio Out Host
Bulk Vendor Device
Dual MIDI Device
Dual Virtual Serial Device
Generic HID Device
Generic HID Host
Joystick Device
Joystick Host
Keyboard Device
Keyboard/Mouse Device
Keyboard Host
Keyboard Host/Device Dual Mode
Mass Storage Device
Mass Storage/Keyboard Device
Mass Storage Host
MIDI Device
MIDI Host
Mouse Device
Mouse Host
Printer Host
RNDIS (CDC) Ethernet Device
RNDIS (CDC) Ethernet Host
Still Image Host
Virtual Serial Device
Virtual Serial Host
Virtual Serial/Mass Storage Device
Virtual Serial/Mouse Device

LUFA also contains USB bootloaders for the following USB classes:

CDC Class, AVR109 protocol compatible (AVRDude)
DFU Class, Atmel DFU protocol compatible (Atmel FLIP, dfu-programmer)
HID Class, with an included custom cross-platform loader application
Printer Class, using the OS's native printer drivers
Mass Storage Class, using the OS's native USB storage drivers

The following LUFA powered open source projects are also included in the LUFA package:

Atmel Studio compatible AVRISP-MKII Programmer Clone (ISP, PDI and TPI protocols)
Dave Fletcher's USB Missile Launcher Host
Denver Gingerich's Stripe Snoop compatible Magnetic Stripe reader
HID Device Report viewer
LED Notifier project, with several .NET host examples
Media Player Controller
MIDI Tone Generator project
OBinou's Relay Board controller project
Temperature Datalogger project, which logs data to the on-board Dataflash's FAT partition
USB to Serial adapter
Webserver using uIP to serve pages via an attached RNDIS device
XPLAIN UART-to-USB bridge/PDI Programmer