Fixed incorrect call to the user callback CALLBACK_Audio_Device_GetSetInterfaceProperty() in the Audio Class device driver (thanks to Tiit Ratsep).

Audio Device Class driver changed to also require the index of the Audio Control interface within the device, for SET/GET/CUR/MIN/MAX/RES property adjustments.

Added Dataflash operational checks and aborts to all projects using the Dataflash to ensure it is working correctly before use.

Fixed compile error for the UC3 architecture when INTERRUPT_CONTROL_ENDPOINT is specified (thanks to Andrus Aaslaid).

Raised the guard bits in the AVRISP-MKII clone project when in PDI and TPI to 32, to prevent communication errors on low quality connections to a target.

Fix errors uncovered by the new build test compile warnings; fix UC3 pipe configuration function broken, redundant function prototypes and unused parameters.

All USB Class Driver configuration struct values are now non-const, to allow for run-time modifications if required before configuring an instance.

Fix UC3 Interrupt Management platform driver not compiling under C++.

Add build tests to verify correct compilation of as many modules as possible under as many architectures as possible.

Fix broken compilation of LUFA under C++ compilers when the Serial peripheral module header file is included in a C++ source file.

Fix missing semicolon in the UC3 architecture host pipe functions.

Fix failed compilation for the XMEGA architecture if USB_DEVICE_ONLY us not specified.

Modify board Dataflash drivers so that each individual board is responsible for including the correct peripheral driver (SPI or SerialSPI) based on the board connections to the Dataflash chip.

Complete A3BU-XPLAINED and B1-XPLAINED board Dataflash drivers.

Fix XMEGA SPI peripheral driver's incorrect const-ness on the SPI peripheral struct.

Altered the HID class driver to only try to construct at maximum one packet per USB frame, to reduce CPU usage.

Allow serial strings to be generated on the older AVR8 devices which do not explicitly state they contain unique values in the datasheet, as this appears to be implemented in hardware.

Updated the AVRISP-MKII Clone programmer project to be compatible with the latest version of AVR Studio (version 5.1).

Changed the AVRISP-MKII Clone programmer project to report a fixed 3.3V VTARGET voltage on USB AVRs lacking an ADC instead of 5V to prevent warnings in AVR Studio 5.1 when programming XMEGA devices.

Fix Dataflash driver for the A3BU-Xplained board.

Minor documentation improvements.

Added INVERTED_VBUS_ENABLE_LINE and NO_AUTO_VBUS_MANAGEMENT compile time options (thanks to Opendous Inc.).

Fixed invalid PID value used in the TempDataLogger project host application (thanks to Anupam Pathak).

Add API support signature to the CDC and DFU class bootloaders, so that the application can detect the bootloader's API support.

Fixed AVRISP-MKII Clone timing out on long programming commands such as programming the EEPROM on an ATMEGA8 (thanks to Martin Kelling).

Fixed DFU class bootloader not resetting the LED pins as high impedance inputs when a software jump to the user applications is requested.

Added new LEDs_Disable(), Buttons_Disable() and Joystick_Disable() functions to the board hardware drivers.

Added new CALLBACK_Audio_Device_GetSetInterfaceProperty() callback to the Audio Device Class driver.

USB_CONFIG_ATTR_BUSPOWERED constant renamed to USB_CONFIG_ATTR_RESERVED, as this was misnamed (thanks to NXP Semiconductors).

Fixed incorrect implementation of LEDs_ToggleLEDs() for the Adafruit-U4 board (thanks to Caroline Saliman).

Altered the Mass Storage Host class driver so that SCSI data STALLs from the attached device can be recovered from automatically without having to reset the Mass Storage interface.

Altered the Mass Storage Host LowLevel demo so that SCSI data STALLs from the attached device can be recovered from automatically without having to reset the Mass Storage interface.

Fixed AVRISP-MKII Clone failing to start application firmware once a TPI programming session is exited.

Add new USB_Host_GetDescriptor() function. Alter the USB_Host_GetDeviceDescriptor() and USB_Host_GetDeviceStringDescriptor() convenience functions so that they wrap the new function.

Add new Android Open Accessory class driver to the library core and add a new Android Open Accessory Host ClassDriver demo.