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 /** \page Page_ChangeLog Project Changelog
  *
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  *  \section Sec_ChangeLogXXXXXX Version XXXXXX
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  *  <b>New:</b>
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  *  - Added new ADC_DisableChannel() function (thanks to Mich Davis)
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  *  - Added new VTARGET_REF_VOLTS and VTARGET_SCALE_FACTOR compile time defines to the AVRISP-MKII programmer project to set
  *    the VTARGET reference voltage and scale factor
14 15
  *  - Added new pgm_read_ptr() macro to Common.h for reading of pointers out of flash memory space
  *  - Added new SWAPENDIAN_16() and SWAPENDIAN_32() macros to Common.h for statically initialized variables at compile time
16
  *  - Added new Drivers/USB/LowLevel/Device.c file to house Device mode specific functions that are more complicated than simple macros
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  *  - Added new AVRStudio 4 project files for all library demos, projects and bootloaders
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  *  - Added ability to set the serial baud rate via the user's terminal in the XPLAINBridge project
19
  *  - Added new LUFA module variables for the different source modules in the core library makefile to simplify project makefiles
20
  *  - Added start of a new Test and Measurement class demo (thanks to Peter Lawrence)
21 22
  *  - Added new SPI_ORDER_* data order masks to the SPI peripheral driver
  *  - Added support to the AVRISP-MKII project for ISP speeds slower than 125KHz via a new software SPI driver
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  *  - Added support for the new button/LED on the latest model USBTINY-MKII
24 25
  *
  *  <b>Changed:</b>
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  *  - The RingBuff library code has been replaced in the XPLAINBridge, Benito and USBtoSerial projects with an ultra lightweight
  *    ring buffer to help improve the reliability of the projects
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  *  - The EEPROM stream read/write functions now use eeprom_update_byte() instead of eeprom_write_byte(), so that only
  *    changed bytes are written to EEPROM to preserve its lifespan
  *  - Changed over the AVRISP-MKII and TemperatureDataLogger projects to use eeprom_update_byte() when writing non-volatile
  *    parameters to EEPROM to preserve its lifespan
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  *  - Removed unused line encoding data and control requests from the CDC Bootloader code, to save space
33
  *  - Renamed SERIAL_STREAM_ASSERT() macro to STDOUT_ASSERT()
34
  *  - The USB_Device_IsRemoteWakeupSent() and USB_Device_IsUSBSuspended() macros have been deleted, as they are now obsolete
35 36
  *  - Rewrote the implementation of the SwapEndian_16() and SwapEndian_32() functions so that they compile down in most instances to
  *    minimal loads and stores rather than complicated shifts
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  *  - The software UART in the XPLAINBridge has been largely altered to try to improve upon its performance and reliability
38
  *  - The USBtoSerial and Benito projects now flushes received data via a flush timer, so that several bytes can be transmitted at once
39 40
  *  - Removed the automated checking of event names in the demo, project and bootloader makefiles due to inconsistancies between the
  *    behaviour of the command line tools used to perform the check on each platform
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  *  - Internal USB driver source files renamed and moved to ease future possible architecture ports
42
  *  - All internal pseudo-function macros have been converted to true inline functions for type-safety and readability
43
  *  - Changed LED indicator masks for the AVRISP-MKII project, so that there are defined roles for each LED
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  *
  *  <b>Fixed:</b>
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  *  - Fixed AVRISP project sending a LOAD EXTENDED ADDRESS command to 128KB AVRs after programming or reading from
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  *    the last page of FLASH (thanks to Gerard Sexton)
  *  - Fixed AVRISP project not sending a full erase-and-write EEPROM command to XMEGA targets when writing to the EEPROM
  *    instead of the split write-only command (thanks to Tim Margush)
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  *  - Fixed RNDISEthernet demos crashing when calculating checksums for Ethernet/TCP packets of more than ~500 bytes due to
  *    an overflow in the checksum calculation loop (thanks to Kevin Malec)
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  *  - Fixed XPLAINBridge project not correctly reading the XMEGA's supply voltage when reporting back to the host
53
  *  - Fixed incorrect signature for the ATMEGA32U2 in the DFU bootloader (thanks to Axel Rohde)
54
  *  - Fixed internal device serial not being accessible on the ATMEGAXXU2 AVRs (thanks to Axel Rohde)
55
  *  - Fixed void pointer arithmetic in ConfigDescriptor.h breaking C++ compatibility (thanks to Michael Hennebry)
56
  *  - Fixed broken PDI EEPROM Section Erase functionality in the AVRISP-MKII project
57
  *  - Fixed USB_Device_SendRemoteWakeup() not working when the USB clock was frozen during USB bus suspend (thanks to Brian Dickman)
58 59
  *  - Fixed occasional lockup of the AVRISP project due to the timeout extension code incorrectly extending the timeout in
  *    PDI and TPI programming modes infinitely
60 61
  *  - Fixed HID device class driver still using PrevReportINBuffer for GetReport control requests even when it has been
  *    set to NULL by the user application (thanks to Axel Rohde)
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  *  - Fixed MIDI_Device_SendEventPacket() not correctly waiting for the endpoint to become ready (thanks to Robin Green)
63 64
  *  - Fixed Benito and USBtoSerial projects not turning off the USART before reconfiguring it, which could cause incorrect
  *    operation to occur (thanks to Bob Paddock)
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Dean Camera committed
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  *
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  *  \section Sec_ChangeLog100513 Version 100513
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  *  <b>New:</b>
  *  - Added incomplete MIDIToneGenerator project
  *  - Added new Relay Controller Board project (thanks to OBinou)
  *  - Added board hardware driver support for the Teensy, USBTINY MKII, Benito and JM-DB-U2 lines of third party USB AVR boards
  *  - Added new ATTR_NO_INIT variable attribute for global variables that should not be automatically cleared on startup
  *  - Added new ENDPOINT_*_BusSuspended error code to the Endpoint function, so that the stream functions early-abort if the bus
  *    is suspended before or during a transfer
  *  - Added new EVENT_CDC_Device_BreakSent() event and CDC_Host_SendBreak() function to the Device and Host CDC Class drivers
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  *  - Added ReportType parameter to the HID device class driver CALLBACK_HID_Device_ProcessHIDReport() function so that FEATURE
  *    reports from the host to the device can be correctly processed
  *  - Added ReportType parameter to the HID host class driver HID_Host_SendReportByID() function so that FEATURE reports can be
  *    issued to the attached device
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  *
  *  <b>Changed:</b>
  *  - AVRISP programmer project now has a more robust timeout system
  *  - Added a timeout value to the TWI_StartTransmission() function, within which the addressed device must respond
  *  - Webserver project now uses the board LEDs to indicate the current IP configuration state
  *  - Added ENABLE_TELNET_SERVER compile time option to the Webserver project to disable the TELNET server if desired
  *  - Increased throughput of the USBtoSerial demo on systems that send multiple bytes per packet (thanks to Opendous Inc.)
  *  - Double bank CDC endpoints in the XPLAIN Bridge project, re-enable JTAG once the mode selection pin has been sampled.
  *  - Standardized the naming scheme given to configuration descriptor sub-elements in the Device mode demos, bootloaders
  *    and projects
  *  - All Class Driver Host mode demos now correctly set the board LEDs to READY once the enumeration process has completed
  *  - Added LIBUSB_FILTERDRV_COMPAT compile time option to the AVRISP programmer project to make the code compatible with Windows
  *    builds of avrdude at the expense of AVRStudio compatibility
  *  - Removed two-step endpoint/pipe bank clear and switch sequence for smaller, faster endpoint/pipe code
  *  - The USB_Init() function no longer calls sei() - the user is now responsible for enabling interrupts when they are ready
  *    for them to be enabled (thanks to Andrei Krainev)
  *  - The Audio_Device_IsSampleReceived() and Audio_Device_IsReadyForNextSample() functions are now inline, to reduce overhead
  *  - Removed the cast to uint16_t on the set baud rate in the USBtoSerial project, so that the higher >1M baud rates can be
  *    selected (thanks to Steffan Woltjer)
  *  - Removed software PDI and TPI emulation from the AVRISP-MKII clone project as it was very buggy and slow - PDI and TPI must
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  *    now be implemented via separate programming headers
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  *  - The CDC class bootloader now uses a watchdog reset rather than a soft-reset when exited to ensure that all hardware is
  *    properly reset to their defaults
  *  - Device mode class driver callbacks are now fired before the control request status stage is sent to prevent the host from
  *    timing out if another request is immediately fired and the device has a lengthy callback routine
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  *  - The TeensyHID bootloader has been removed, per request from Paul at PJRC
  *  - The LIBUSB_FILTERDRV_COMPAT compile time option in the XPLAINBridge and AVRISP-MKII projects has been renamed
  *    LIBUSB_DRIVER_COMPAT, as it applies to all software on all platforms using the libUSB driver
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  *
  *  <b>Fixed:</b>
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  *  - Fixed possible device lockup when INTERRUPT_CONTROL_ENDPOINT is enabled and the control endpoint is not properly
  *    selected when the ISR completes
  *  - Fixed AVRISP-MKII clone project not correctly issuing LOAD EXTENDED ADDRESS commands when the extended address
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  *    boundary is crossed during programming or read back (thanks to Gerard Sexton)
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  *  - Fixed warnings when building the AVRISP-MKII clone project with the ENABLE_XPROG_PROTOCOL compile time option disabled
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  *  - Fixed software PDI/TPI programming mode in the AVRISP project not correctly toggling just the clock pin
  *  - Fixed TWI_StartTransmission() corrupting the contents of the GPIOR0 register
  *  - Fixed TWI driver not aborting when faced with no response after attempting to address a device on the bus
  *  - Fixed ADC routines not correctly returning the last result when multiple channels were read
  *  - Fixed ADC routines failing to read the extended channels (Channels 8 to 13, Internal Temperature Sensor) on the
  *    U4 series USB AVR parts
  *  - Fixed LowLevel MassStorage demo broken on the U2 series USB AVRs due to unsupported double-banked endpoint modes used
  *  - Fixed compilation error in the AudioInput demos when MICROPHONE_BIASED_TO_HALF_RAIL is defined (thanks to C. Scott Ananian)
  *  - Fixed incorrect definition of HID_ALIGN_DATA() causing incorrect HID report item data alignment
  *  - Fixed Still Image Host class driver not resetting the transaction ID when a new session is opened, fixed driver not sending
  *    a valid session ID to the device
  *  - Removed invalid dfu and flip related targets from the bootloaders - bootloaders can only be replaced with an external programmer
  *  - Fixed Set/Clear Feature requests directed to a non-configured endpoint not returning a stall to the host
  *  - Fixed HID Device Class Driver not allocating a temporary buffer when the host requests a report via the control endpoint and the
  *    user has set the PrevReportINBuffer driver configuration element to NULL (thanks to Lars Noschinski)
  *  - Fixed device state not being reset to DEVICE_STATE_Default if the host sets a 0x00 device address
  *  - Fixed device not stalling configuration requests before the device's address has been set
  *  - Fixed possibility of internal signature retrieval being corrupted if an interrupt occurs during a signature byte
  *    read (thanks to Andrei Krainev)
  *  - Fixed device state not being reset back to the default state if the host sets the address to 0
  *  - Fixed Set Configuration requests not being stalled until the host has set the device's address
  *  - Fixed Host mode HID class driver not sending the correct report type when HID_Host_SendReportByID() was called and the 
  *    HID_HOST_BOOT_PROTOCOL_ONLY compile time option is set
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  *  - Fixed INTERRUPT_CONTROL_ENDPOINT compile time option preventing other interrupts from occurring while the control endpoint
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  *    request is being processed, causing possible lockups if a USB interrupt occurs during a transfer
  *  - Remove incorrect Abstract Call Management class specific descriptor from the CDC demos, bootloaders and projects
  *
  *  \section Sec_ChangeLog100219 Version 100219
  *
  *  <b>New:</b>
  *  - Added TPI programming support for 6-pin ATTINY devices to the AVRISP programmer project (thanks to Tom Light)
  *  - Added command timeout counter to the AVRISP project so that the device no longer freezes when incorrectly connected
  *    to a target
  *  - Added new TemperatureDataLogger application, a USB data logger which writes to the device's dataflash and appears to
  *    the host as a standard Mass Storage device when inserted
  *  - Added MIDI event packing support to the MIDI Device and Host mode Class drivers, allowing for multiple MIDI events to
  *    sent or received in packed form in a single USB packet
  *  - Added new MIDI send buffer flush routines to the MIDI Device and Host mode Class drivers, to flush packed events
  *  - Added master mode hardware TWI driver for easy TWI peripheral control
  *  - Added ADC MUX masks for the standard ADC input channels on all AVR models with an ADC, altered demos to use these masks
  *    as on some models, the channel number is not identical to its single-ended ADC MUX mask
  *  - New Webserver project, a RNDIS host USB webserver using the open source uIP TCP/IP network stack and FatFS library
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  *  - New BOARD value option BOARD_NONE (equivalent to not specifying BOARD) which will remove all board hardware drivers which
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  *    do not adversely affect the code operation (currently only the LEDs driver)
  *  - Added keyboard modifier masks (HID_KEYBOARD_MODIFER_*) and LED report masks (KEYBOARD_LED_*) to the HID class driver and
  *    Keyboard demos
  *  - Added .5MHz recovery clock to the AVRISP programmer project when in ISP programming mode to correct mis-set fuses
  *
  *  <b>Changed:</b>
  *  - Slowed down software USART carried PDI programming in the AVRISP project to prevent transmission errors
  *  - Renamed the AVRISP project folder to AVRISP-MKII to reduce confusion
  *  - Renamed the RESET_LINE_* makefile tokens in the AVRISP MKII Project to AUX_LINE_*, as they are not always used for target
  *    reset
  *  - Changed over the MassStorageKeyboard Class driver device demo to use Start of Frame events rather than a timer to keep track
  *    of elapsed milliseconds
  *  - Inlined currently unused (but standardized) maintenance functions in the Device and Host Class drivers to save space
  *  - The XPLAINBridge project now selects between a USB to Serial bridge and a PDI programmer on startup, reading the JTAG port's
  *    TDI pin to determine which mode to use
  *  - Removed the stream example code from the Low Level VirtualSerial demos, as they were buggy and only served to add clutter
  *
  *  <b>Fixed:</b>
  *  - Fixed AVRISP project not able to enter programming mode when ISP protocol is used
  *  - Fixed AVRISP PDI race condition where the guard time between direction changes could be interpreted as a start bit
  *  - Fixed ADC_IsReadingComplete() returning an inverted result
  *  - Fixed blocking CDC streams not aborting when the host is disconnected
  *  - Fixed XPLAIN board Dataflash driver broken due to incorrect preprocessor commands
  *  - Fixed inverted XPLAIN LED driver output (LED turned on when it was supposed to be turned off, and vice-versa)
  *  - Fixed Class Driver struct interface numbers in the KeyboardMouse and VirtualSerialMouse demos (thanks to Renaud Cerrato)
  *  - Fixed invalid USB controller PLL prescaler values for the ATMEGAxxU2 controllers
  *  - Fixed lack of support for the ATMEGA32U2 in the DFU and CDC class bootloaders
  *  - Fixed Benito project not resetting the target AVR automatically when programming has completed
  *  - Fixed DFU bootloader programming not discarding the correct number of filler bytes from the host when non-aligned programming
  *    ranges are specified (thanks to Thomas Bleeker)
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  *  - Fixed CDC and RNDIS host demos and class drivers - bidirectional endpoints should use two separate pipes, not one half-duplex pipe
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  *  - Fixed Pipe_IsEndpointBound() not taking the endpoint's direction into account
  *  - Fixed EEPROM and FLASH ISP programming in the AVRISP project
  *  - Fixed incorrect values of USB_CONFIG_ATTR_SELFPOWERED and USB_CONFIG_ATTR_REMOTEWAKEUP tokens (thanks to Claus Christensen)
  *  - Fixed SerialStream driver blocking while waiting for characters to be received instead of returning EOF
  *  - Fixed SerialStream driver not setting stdin to the created serial stream (thanks to Mike Alexander)
  *  - Fixed USB_GetHIDReportSize() returning the number of bits in the specified report instead of bytes
  *  - Fixed AVRISP project not extending the command delay after each successful page/word/byte program
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  *  - Fixed accuracy of the SERIAL_UBBRVAL() and SERIAL_2X_UBBRVAL() macros for higher baud rates (thanks to Renaud Cerrato)
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  *
  *  \section Sec_ChangeLog091223 Version 091223
  *
  *  <b>New:</b>
  *  - Added activity LED indicators to the AVRISP project to indicate when the device is busy processing a command
  *  - The USB target family and allowable USB mode tokens are now public and documented (USB_CAN_BE_*, USB_SERIES_*_AVR)
  *  - Added new XPLAIN USB to Serial Bridge project (thanks to John Steggall for initial proof-of-concept, David Prentice
  *    and Peter Danneger for revised software USART code)
  *  - Added new RNDIS Ethernet Host LowLevel demo
  *  - Added new RNDIS Ethernet Host Class Driver
  *  - Added new RNDIS Ethernet Host ClassDriver demo
  *  - Added CDC_Host_Flush() function to the CDC Host Class driver to flush sent data to the attached device
  *  - Added PDI programming support for XMEGA devices to the AVRISP programmer project (thanks to Justin Mattair)
  *  - Added support for the XPLAIN board Dataflash, with new XPLAIN_REV1 board target for the different dataflash used
  *    on the first revision boards compared to the one mounted on later revisions
  *  - Added new HID_ALIGN_DATA() macro to return the pre-retrieved value of a HID report item, left-aligned to a given datatype
  *  - Added new PreviousValue to the HID Report Parser report item structure, for easy monitoring of previous report item values
  *  - Added new EVK527 board target
  *  - Added new USB_Host_GetDeviceStringDescriptor() convenience function
  *  - Added new LEDNotification project to the library, to give a visual LED notification on new events from the host
  *  - Added new NO_DEVICE_REMOTE_WAKEUP and NO_DEVICE_SELF_POWER compile time options
  *
  *  <b>Changed:</b>
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  *  - Removed code in the Keyboard demos to send zeroed reports between two reports with differing numbers of key codes
  *    as this relied on non-standard OS driver behavior to repeat key groups
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  *  - The SCSI_Request_Sense_Response_t and SCSI_Inquiry_Response_t type defines are now part of the Mass Storage Class
  *    driver common defines, rather than being defined in the Host mode Class driver section only
  *  - The USB_MODE_HOST token is now defined even when host mode is not available
  *  - The CALLBACK_HID_Device_CreateHIDReport() HID Device Class driver callback now has a new ReportType parameter to
  *    indicate the report type to generate
  *  - All Class Drivers now return false or the "DeviceDisconnected" error code of their respective error enums when a function
  *    is called when no host/device is connected where possible
  *  - The HOST_SENDCONTROL_DeviceDisconnect enum value has been renamed to HOST_SENDCONTROL_DeviceDisconnected to be in line
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  *    with the rest of the library error codes
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  *  - Make MIDI device demos also turn off the on board LEDs if MIDI Note On messages are sent with a velocity of zero,
  *    which some devices use instead of Note Off messages (thanks to Robin Green)
  *  - The CDC demos are now named "VirtualSerial" instead to indicate the demos' function rather than its implemented USB class,
  *    to reduce confusion and to be in line with the rest of the LUFA demos
  *  - The SImage_Host_SendBlockHeader() and SImage_Host_ReceiveBlockHeader() Still Image Host Class driver functions are now public
  *
  *  <b>Fixed:</b>
  *  - Added missing CDC_Host_CreateBlockingStream() function code to the CDC Host Class driver
  *  - Fixed incorrect values for REPORT_ITEM_TYPE_* enum values causing corrupt data in the HID Host Parser
  *  - Fixed misnamed SI_Host_USBTask() and SI_Host_ConfigurePipes() functions
  *  - Fixed broken USB_GetNextDescriptor() function causing the descriptor to jump ahead double the expected amount
  *  - Fixed Pipe_IsEndpointBound() not masking the given Endpoint Address against PIPE_EPNUM_MASK
  *  - Fixed host state machine not enabling Auto VBUS mode when HOST_DEVICE_SETTLE_DELAY_MS is set to zero
  *  - Fixed misnamed Pipe_SetPipeToken() macro for setting a pipe's direction
  *  - Fixed CDCHost failing on devices with bidirectional endpoints
  *  - Fixed USB driver failing to define the PLL prescaler mask for the ATMEGA8U2 and ATMEGA16U2
  *  - Fixed HID Parser not distributing the Usage Min and Usage Max values across an array of report items
  *  - Fixed Mass Storage Host Class driver and Low Level demo not clearing the error condition if an attached device returns a
  *    STALL to a GET MAX LUN request (thanks to Martin Luxen)
  *  - Fixed TeensyHID bootloader not properly shutting down the USB interface to trigger a disconnection on the host before resetting
  *  - Fixed MassStorageHost Class driver demo not having USB_STREAM_TIMEOUT_MS compile time option set properly to prevent slow 
  *    devices from timing out the data pipes
  *  - Fixed the definition of the Endpoint_BytesInEndpoint() macro for the U4 series AVR parts
  *  - Fixed MIDI host Class driver MIDI_Host_SendEventPacket() routine not properly checking for Pipe ready before writing
  *  - Fixed use of deprecated struct initializers, removed library unused parameter warnings when compiled with -Wextra enabled
  *  - Fixed Still Image Host Class driver truncating the PIMA response code (thanks to Daniel Seibert)
  *  - Fixed USB_CurrentMode not being reset to USB_MODE_NONE when the USB interface is shut down and both Host and Device modes can be
  *    used (thanks to Daniel Levy)
  *  - Fixed TeensyHID bootloader not enumerating to the host correctly (thanks to Clint Fisher)
  *  - Fixed AVRISP project timeouts not checking for the correct timeout period (thanks to Carl Ott)
  *  - Fixed STK525 Dataflash driver using incorrect bit-shifting for Dataflash addresses (thanks to Tim Mitchell)
  *
  *  \section Sec_ChangeLog091122 Version 091122
  *
  *  <b>New:</b>
  *  - Added new Dual Role Keyboard/Mouse demo
  *  - Added new HID_HOST_BOOT_PROTOCOL_ONLY compile time token to reduce the size of the HID Host Class driver when
  *    Report protocol is not needed
  *  - Added new MIDI LowLevel and ClassDriver Host demo, add new MIDI Host Class driver
  *  - Added new CDC/Mouse ClassDriver device demo
  *  - Added new Joystick Host ClassDriver and LowLevel demos
  *  - Added new Printer Host mode Class driver
  *  - Added new Printer Host mode ClassDriver demo
  *  - Added optional support for double banked endpoints and pipes in the Device and Host mode Class drivers
  *  - Added new stream creation function to the CDC Class drivers, to easily make standard I/O streams from CDC Class driver instances
  *
  *  <b>Changed:</b>
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  *  - Removed mostly useless "TestApp" demo, as it was mainly useful only for checking for syntax errors in the library
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  *  - MIDI device demos now receive MIDI events from the host and display note ON messages via the board LEDs
  *  - Cleanups to the Device mode Mass Storage demo application SCSI routines
  *  - Changed Audio Class driver sample read/write functions to be inline, to reduce the number of cycles needed to transfer
  *    samples to and from the device (allowing more time for sample processing and output)
  *  - Audio class Device mode demos now work at both 16MHz and 8MHz, rather than just at 8MHz
  *  - The previous USBtoSerial demo has been moved into the projects directory, as it was just a modified CDC demo
  *  - The Endpoint/Pipe functions now use the const qualifier on the input buffer
  *  - Changed the CALLBACK_HIDParser_FilterHIDReportItem() callback to pass a HID_ReportItem_t rather than just the current
  *    item's attributes, to expose more information on the item (including it's type, collection path, etc.)
  *  - Changed MouseHostWithParser demos to check that the report items have a Mouse usage collection as a parent at some point,
  *    to prevent Joysticks from enumerating with the demo
  *  - Corrected the name of the misnamed USB_GetDeviceConfigDescriptor() function to USB_Host_GetDeviceConfigDescriptor().
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  *  - Keyboard LowLevel/ClassDriver demos now support multiple simultaneous key presses (up to 6) per report
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  *
  *  <b>Fixed:</b>
  *  - Fixed PrinterHost demo returning invalid Device ID data when the attached device does not have a
  *    device ID (thanks to Andrei Krainev)
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  *  - Changed LUFA_VERSION_INTEGER define to use BCD values, to make comparisons easier
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  *  - Fixed issue in the HID Host class driver's HID_Host_SendReportByID() routine using the incorrect mode (control/pipe)
  *    to send report to the attached device
  *  - Fixed ClassDriver AudioOutput device demo not selecting an audio output mode
  *  - Fixed incorrect SampleFrequencyType value in the AudioInput and AudioOutput ClassDriver demos' descriptors
  *  - Fixed incorrect event name rule in demo/project/bootloader makefiles
  *  - Fixed HID device class driver not reselecting the correct endpoint once the user callback routines have been called
  *  - Corrected HID descriptor in the Joystick Device demos - buttons should be placed outside the pointer collection
  *  - Fixed HID report parser collection paths invalid due to misplaced semicolon in the free path item search loop
  *  - Fixed HID host Class driver report send/receive report broken when issued through the control pipe
  *  - Fixed HOST_STATE_AS_GPIOR compile time option being ignored when in host mode (thanks to David Lyons)
  *  - Fixed LowLevel Keyboard demo not saving the issues report only after it has been sent to the host
  *  - Fixed Endpoint_Write_Control_Stream_* functions not sending a terminating IN when given data Length is zero
  *
  *  \section Sec_ChangeLog090924 Version 090924
  *
  *  <b>New:</b>
  *  - Added new host mode class drivers and matching demos to the library for rapid application development
  *  - Added flag to the HID report parser to indicate if a device has multiple reports
  *  - Added new EVENT_USB_Device_StartOfFrame() event, controlled by the new USB_Device_EnableSOFEvents() and
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  *    USB_Device_DisableSOFEvents() macros to give bus-synchronized millisecond interrupts when in USB device mode
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  *  - Added new Endpoint_SetEndpointDirection() macro for bidirectional endpoints
  *  - Added new AVRISP project, a LUFA powered clone of the Atmel AVRISP-MKII programmer
  *  - Added ShutDown() functions for all hardware peripheral drivers, so that peripherals can be turned off after use
  *  - Added new CDC_Device_Flush() command to the device mode CDC Class driver to flush Device->Host data
  *  - Added extra masks to the SPI driver, changed SPI_Init() so that the clock polarity and sample modes can be set
  *  - Added new callback to the HID report parser, so that the user application can filter only the items it is interested
  *    in to be stored into the HIDReportInfo structure to save RAM
  *  - Added support for the officially recommended external peripheral layout for the BUMBLEB board (thanks to Dave Fletcher)
  *  - Added new Pipe_IsFrozen() macro to determine if the currently selected pipe is frozen
  *  - Added new USB_GetHIDReportSize() function to the HID report parser to retrieve the size of a given report by its ID
  *  - Added new combined Mass Storage and Keyboard demo (thanks to Matthias Hullin)
  *  
  *  <b>Changed:</b>
  *  - SetIdle requests to the HID device driver with a 0 idle period (send changes only) now only affect the requested
  *    HID interface within the device, not all HID interfaces
  *  - Added explicit attribute masks to the device mode demos' descriptors
  *  - Added return values to the CDC and MIDI class driver transmit functions
  *  - Optimized Endpoint_Read_Word_* and Pipe_Read_Word_* macros to reduce compiled size
  *  - Added non-null function parameter pointer restrictions to USB Class drivers to improve user code reliability
335
  *  - Added new "Common" section to the class drivers, to hold all mode-independent definitions for clarity
336 337
  *  - Moved SCSI command/sense constants into the Mass Storage Class driver, instead of the user-code
  *  - Altered the SCSI commands in the LowLevel Mass Storage Host to save on FLASH space by reducing function calls
338
  *  - Changed the parameters and behavior of the USB_GetDeviceConfigDescriptor() function so that it now performs size checks
339 340 341 342 343 344 345 346
  *    and data validations internally, to simplify user code
  *  - Changed HIDParser to only zero out important values in the Parsed HID Report Item Information structure to save cycles
  *  - The HID report parser now always processed FEATURE items - HID_ENABLE_FEATURE_PROCESSING token now has no effect
  *  - The HID report parser now always ignores constant-data items, HID_INCLUDE_CONSTANT_DATA_ITEMS token now has no effect
  *  - The Benito Programmer project now has its own unique VID/PID pair allocated from the Atmel donated LUFA VID/PID pool
  *  - Add in new invalid event hook check targets to project makefiles to produce compilation errors when invalid event names
  *    are used in a project
  *  - The HID Report Parser now gives information on the total length of each report within a HID interface
347
  *  - The USE_NONSTANDARD_DESCRIPTOR_NAMES compile time token has been removed - there are now separate USB_Descriptor_* and
348 349 350 351 352 353 354 355 356 357
  *    USB_StdDescriptor_* structures for both the LUFA and standardized element naming conventions so both may be used
  *
  *  <b>Fixed:</b>
  *  - Fixed possible lockup in the CDC device class driver, when the host sends data that is a multiple of the
  *    endpoint's bank
  *  - Fixed swapped parameters in the HID state memory copy call while processing a HID PUSH item in the HID report parser
  *  - Fixed memory corruption HID report parser when too many COLLECTION or PUSH items were processed
  *  - Fixed HID report parser not resetting the FEATURE item count when a REPORT ID item is encountered
  *  - Fixed USBtoSerial demos not reading in UDR1 when the USART receives data but the USB interface is not enumerated,
  *    causing continuous USART receive interrupts
358
  *  - Fixed misspelled event name in the Class driver USBtoSerial demo, preventing correct operation
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
  *  - Fixed invalid data being returned when a GetStatus request is issued in Device mode with an unhandled data recipient
  *  - Added hardware USART receive interrupt and software buffering to the Benito project to ensure received data is not
  *    missed or corrupted
  *  - Fixed Device mode HID Class driver always sending IN packets, even when nothing to report
  *  - Fixed Device mode HID Class driver not explicitly initializing the ReportSize parameter to zero before calling callback
  *    routine, so that ignored callbacks don't cause incorrect data to be sent
  *  - Fixed StillImageHost not correctly freezing and unfreezing data pipes while waiting for a response block header
  *  - Fixed error in the PrinterHost demo preventing the full page data from being sent to the attached device (thanks to John Andrews)
  *  - Fixed CDC based demos and projects' INF driver files under 64 bit versions of Windows (thanks to Ronny Hanson, Thomas Bleeker)
  *  - Re-add in missing flip, flip-ee, dfu and dfu-ee targets to project makefiles (thanks to Opendous Inc.)
  *  - Fix allowable F_CPU values comment in project makefiles to more accurately reflect the allowable values on the USB AVRs
  *  - Fixed DFU and CDC class bootloaders on the series 2 USB AVRs, corrected invalid signatures, added support for the new
  *    ATMEGAxx2 series 2 variant AVRs to the DFU bootloader
  *  - Fixed Low Level USBtoSerial demo not storing received characters (thanks to Michael Cooper)
  *  - Fixed MIDI Device Class driver not sending/receiving MIDI packets of the correct size (thanks to Thomas Bleeker)
  *
  *
  *  \section Sec_ChangeLog090810 Version 090810
  *
  *  <b>New:</b>
  *  - Added new device class drivers and matching demos to the library for rapid application development
  *  - Added new PrinterHost demo (thanks to John Andrews)
381
  *  - Added USB Missile Launcher project, submitted by Dave Fletcher
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
  *  - Added new Benito Arduino Programmer project
  *  - Added incomplete device and host mode demos for later enhancement
  *  - Updated MassStorage device block write routines to use ping-pong Dataflash buffering to increase throughput by around 30%
  *  - Error status LEDs shown when device endpoint configuration fails to complete in all demos and projects
  *  - Added new USB_Host_SetDeviceConfiguration() convenience function for easy configuration selection of devices while in USB
  *    host mode
  *  - Added new USB_Host_ClearPipeStall() convenience function to clear a stall condition on an attached device's endpoint
  *  - Added new USB_Host_GetDeviceDescriptor() convenience function to retrieve the attached device's Device descriptor
  *  - Added new Endpoint_ClearStatusStage() convenience function to assist with the status stages of control transfers
  *  - Added new USE_INTERNAL_SERIAL define for using the unique serial numbers in some AVR models as the USB device's serial number,
  *    added NO_INTERNAL_SERIAL compile time option to turn off new serial number reading code
  *  - Added new DATAFLASH_CHIP_MASK() macro to the Dataflash driver, which returns the Dataflash select mask for the given chip index
  *  - Added new HOST_STATE_WaitForDeviceRemoval host state machine state for non-blocking disabling of device communications until the
  *    device has been removed (for use when an error occurs or communications with the device have completed)
  *  - Added new FAST_STREAM_TRANSFERS compile time option for faster stream transfers via multiple bytes copied per stream loop
  *  - Added stdio stream demo code to the CDC device demos, to show how to create standard streams out of the virtual serial ports
  *  - Added new EEPROM and FLASH buffer versions of the Endpoint and Pipe stream functions
  *  - Added new USE_FLASH_DESCRIPTORS and FIXED_NUM_CONFIGURATIONS compile time options
  *  - Added support for the new ATMEGA32U2, ATMEGA16U2 and ATMEGA8U2 AVR models
  *  - Added new USB_DeviceState variable to keep track of the current Device mode USB state
  *  - Added new LEDs_ToggleLEDs() function to the LEDs driver
  *  - Added new Pipe_BoundEndpointNumber() and Pipe_IsEndpointBound() functions
  *  - Added new DEVICE_STATE_AS_GPIOR and HOST_STATE_AS_GPIOR compile time options
  *  - Added 404 Not Found errors to the webserver in the RNDIS demos to indicate invalid URLs
  *  
  *  <b>Changed:</b>
408
  *  - Deprecated pseudo-scheduler and removed dynamic memory allocator from the library (first no longer needed and second unused)
409 410 411 412 413 414 415 416 417 418 419 420 421 422
  *  - The device-mode CALLBACK_USB_GetDescriptor() function now has an extra parameter so that the memory space in which the requested
  *    descriptor is located can be specified. This means that descriptors can now be located in multiple memory spaces within a device.
  *  - Removed vague USB_IsConnected global - test USB_DeviceState or USB_HostState explicitly to gain previous functionality
  *  - Removed USB_IsSuspended global - test USB_DeviceState against DEVICE_STATE_Suspended instead
  *  - Extended USB_GetDeviceConfigDescriptor() routine to require the configuration number within the device to fetch
  *  - Dataflash_WaitWhileBusy() now always ensures that the dataflash is ready for the next command immediately after returning,
  *    no need to call Dataflash_ToggleSelectedChipCS() afterwards
  *  - Low level API MIDI device demo no longer blocks if a note change event is sent while the endpoint is not ready
  *  - Pipe_GetErrorFlags() now returns additional error flags for overflow and underflow errors
  *  - Pipe stream functions now automatically set the correct pipe token, so that bidirectional pipes can be used
  *  - Pipe_ConfigurePipe() now automatically defaults IN pipes to accepting infinite IN requests, this can still be changed by calling
  *    the existing Pipe_SetFiniteINRequests() function
  *  - Changed F_CLOCK entries in project makefiles to alias to F_CPU by default, as this is the most common case
  *  - Host mode demos now use sane terminal escape codes, so that text is always readable and events/program output is visually distinguished
423
  *    from one another using foreground colours
424 425 426 427 428 429 430
  *  - Internal per-device preprocessing conditions changed to per-device series rather than per-controller group for finer-grain
  *    internal control
  *  - Interrupts are no longer disabled during the processing of Control Requests on the default endpoint while in device mode
  *  - AudioOutput demos now always output to board LEDs, regardless of output mode (removed AUDIO_OUT_LEDS project option)
  *  - Removed SINGLE_DEVICE_CONFIGURATION compile time option in favour of the new FIXED_NUM_CONFIGURATIONS option so that the exact number
  *    of device configurations can be defined statically
  *  - Removed VBUS events, as they are already exposed to the user application via the regular device connection and disconnection events
431
  *  - Renamed and altered existing events to properly separate out Host and Device mode events
432 433 434
  *
  *  <b>Fixed:</b>
  *  - Changed bootloaders to use FLASHEND rather than the existence of RAMPZ to determine if far FLASH pointers are needed to fix
435
  *    bootloaders on some of the USB AVR devices where avr-libc erroneously defines RAMPZ
436
  *  - Fixes to MassStorageHost for better device compatibility (increase command timeout, change MassStore_WaitForDataReceived()
437
  *    to only unfreeze and check one data pipe at a time) to prevent incorrect device enumerations and freezes while transferring data
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
  *  - Make Pipe_ConfigurePipe() mask the given endpoint number against PIPE_EPNUM_MASK to ensure the endpoint IN direction bit is
  *    cleared to prevent endpoint type corruption
  *  - Fixed issue opening CDC-ACM ports on hosts when the CDC device tries to send data before the host has set the line encoding
  *  - Fixed USB_OPT_MANUAL_PLL option being ignored during device disconnects on some models (thanks to Brian Dickman)
  *  - Fixed documentation mentioning Pipe_GetCurrentToken() function when correct function name is Pipe_GetPipeToken()
  *  - Fixed ADC driver for the ATMEGA32U4 and ATMEGA16U4 (thanks to Opendous Inc.)
  *  - Fixed CDCHost demo unfreezing the pipes at the point of configuration, rather than use
  *  - Fixed MassStorage demo not clearing the reset flag when a Mass Storage Reset is issued while not processing a command
  *  - Fixed USB_Host_SendControlRequest() not re-suspending the USB bus when initial device ready-wait fails
  *  - Fixed USB Pad regulator not being disabled on some AVR models when the USB_OPT_REG_DISABLED option is used
  *  - Fixed Host mode to Device mode UID change not causing a USB Disconnect event when a device was connected
  *  - Fixed Mouse/Keyboard demos not performing the correct arithmetic on the Idle period at the right times (thanks to Brian Dickman)
  *  - Fixed GenericHID failing HID class tests due to incorrect Logical Minimum and Logical Maximum values (thanks to Søren Greiner)
  *  - Fixed incorrect PIPE_EPNUM_MASK mask causing pipe failures on devices with endpoint addresses of 8 and above (thanks to John Andrews)
  *  - Fixed report data alignment issues in the MouseHostWithParser demo when X and Y movement data size is not a multiple of 8 bits
  *  - Fixed HID Report Descriptor Parser not correctly resetting internal states when a REPORT ID element is encountered
  *  - Fixed incorrect BUTTONS_BUTTON1 for the STK526 target
  *  - Fixed RNDIS demos freezing when more than one connection was attempted simultaneously, causing memory corruption
456
  *  - Fixed USBtoSerial demo receiving noise from the USART due to pull-up not being enabled
457 458 459 460 461 462 463 464 465 466 467 468 469 470 471
  *
  *
  *  \section Sec_ChangeLog090605 Version 090605
  *
  *  - Fixed bug in RNDISEthernet and DualCDC demos not using the correct USB_ControlRequest structure for control request data
  *  - Fixed documentation showing incorrect USB mode support on the supported AVRs list
  *  - Fixed RNDISEthernet not working under Linux due to Linux requiring an "optional" RNDIS request which was unhandled
  *  - Fixed Mouse and Keyboard device demos not acting in accordance with the HID specification for idle periods (thanks to Brian Dickman)
  *  - Removed support for endpoint/pipe non-control interrupts; these did not act in the way users expected, and had many subtle issues
  *  - Fixed Device Mode not handling Set Feature and Clear Feature Chapter 9 requests that are addressed to the device (thanks to Brian Dickman)
  *  - Moved control endpoint interrupt handling into the library itself, enable via the new INTERRUPT_CONTROL_ENDPOINT token
  *  - Fixed CDCHost not clearing configured pipes and resetting configured pipes mask when a partially enumerated invalid CDC
  *    interface is skipped
  *  - Clarified the size of library tokens which accept integer values in the Compile Time Tokens page, values now use the smallest datatype
  *    inside the library that is able to hold their defined value to save space
472
  *  - Removed DESCRIPTOR_ADDRESS() macro as it was largely superfluous and only served to obfuscate code
473 474 475 476 477 478 479
  *  - Rewritten event system to remove all macros, to make user code clearer
  *  - Fixed incorrect ENDPOINT_EPNUM_MASK mask preventing endpoints above EP3 from being selected (thanks to Jonathan Oakley)
  *  - Removed STREAM_CALLBACK() macro - callbacks now use regular function definitions to clarify user code
  *  - Removed DESCRIPTOR_COMPARATOR() macro - comparators should now use regular function definitions to clarify user code
  *  - USB_IsConnected is now cleared before the USB_Disconnect() event is fired in response to VBUS being removed
  *  - Fixed incorrect PID value being used in the USBtoSerial project (thanks to Phill)
  *  - Deleted StdDescriptors.c, renamed USB_GetDescriptor() to CALLBACK_USB_GetDescriptor, moved ConfigDescriptor.c/.h from the
480
  *    LUFA/Drivers/USB/Class/ directory to LUFA/Drivers/USB/HighLevel/ in preparation for the new USB class APIs
481 482
  *  - Moved out each demos' functionality library files (e.g. Ring Buffer library) to /Lib directories for a better directory structure
  *  - Removed Tx interrupt from the USBtoSerial demo; now sends characters via polling to ensure more time for the Rx interrupt
483
  *  - Fixed possible enumeration errors from spin-loops which may fail to exit if the USB connection is severed before the exit condition
484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532
  *    becomes true
  *
  *
  *  \section Sec_ChangeLog090510 Version 090510
  *
  *  - Added new GenericHIDHost demo
  *  - Corrections to the KeyboardHost and MouseHost demos' pipe handling to freeze and unfreeze the data pipes at the point of use
  *  - KeyboardHost, MouseHost and GenericHIDHost demos now save and restore the currently selected pipe inside the pipe ISR
  *  - Changed GenericHID device demo to use the LUFA scheduler, added INTERRUPT_DATA_ENDPOINT and INTERRUPT_CONTROL_ENDPOINT compile
  *    time options
  *  - All comments in the library, bootloaders, demos and projects have now been spell-checked and spelling mistakes/typos corrected
  *  - Added new PIMA_DATA_SIZE() define to the Still Image Host demo
  *  - Add call to MassStore_WaitForDataReceived() in MassStore_GetReturnedStatus() to ensure that the CSW has been received in the
  *    extended MSC timeout period before continuing, to prevent long processing delays from causing the MassStore_GetReturnedStatus()
  *    to early-abort (thanks to Dmitry Maksimov)
  *  - Move StdRequestType.h, StreamCallbacks.h, USBMode.h from the LowLevel USB driver directory to the HighLevel USB driver directory,
  *    where they are more suited
  *  - Removed all binary constants and replaced with decimal or hexadecimal constants so that unpatched GCC compilers can still build the
  *    code without having to be itself patched and recompiled first
  *  - Added preprocessor checks and documentation to the bootloaders giving information about missing SIGNATURE_x defines due to
  *    outdated avr-libc versions.
  *  - Added support to the CDCHost demo for devices with multiple CDC interfaces which are not the correct ACM type preceding the desired
  *    ACM CDC interface
  *  - Fixed GenericHID demo not starting USB and HID management tasks when not using interrupt driven modes (thanks to Carl Kjeldsen)
  *  - Fixed RNDISEthenet demo checking the incorrect message field for packet size constraints (thanks to Jonathan Oakley)
  *  - Fixed WriteNextReport code in the GenericHIDHost demo using incorrect parameter types and not selecting the correct endpoint
  *  - Adjusted sample CTC timer calculations in the AudioOutput and AudioInput demos to match the CTC calculations in the AVR datasheet,
  *    and to fix instances where rounding caused the endpoint to underflow (thanks to Robin Theunis)
  *  - The USB_Host_SendControlRequest() function no longer automatically selects the Control pipe (pipe 0), so that other control type
  *    pipes can be used with the function
  *  - The USB Host management task now saves and restores the currently selected pipe before and after the task completes
  *  - Fixed GenericHIDHost demo report write routine incorrect for control type requests (thanks to Andrei Krainev)
  *  - Removed Endpoint_ClearCurrentBank() and Pipe_ClearCurrentBank() in favour of new Endpoint_ClearIN(), Endpoint_ClearOUT(),
  *    Pipe_ClearIN() and Pipe_ClearOUT() macros (done to allow for the detection of packets of zero length)
  *  - Renamed *_ReadWriteAllowed() macros to *_IsReadWriteAllowed() to remain consistent with the rest of the LUFA API
  *  - Endpoint_IsSetupReceived() macro has been renamed to Endpoint_IsSETUPReceived(), Endpoint_ClearSetupReceived() macro has been
  *    renamed to Endpoint_ClearSETUP(), the Pipe_IsSetupSent() macro has been renamed to Pipe_IsSETUPSent() and the
  *    Pipe_ClearSetupSent() macro is no longer applicable and should be removed - changes made to compliment the new endpoint and pipe
  *    bank management API
  *  - Updated all demos, bootloaders and projects to use the new endpoint and pipe management APIs (thanks to Roman Thiel from Curetis AG)
  *  - Updated library doxygen documentation, added groups, changed documentation macro functions to real functions for clarity
  *  - Removed old endpoint and pipe aliased read/write/discard routines which did not have an explicit endian specifier for clarity
  *  - Removed the ButtLoadTag.h header file, as no one used for its intended purpose anyway
  *  - Renamed the main Drivers/AT90USBXXX directory to Drivers/Peripheral, renamed the Serial_Stream driver to SerialStream
  *  - Fixed CDC and USBtoSerial demos freezing where buffers were full while still transmitting or receiving (thanks to Peter Hand)
  *  - Removed "Host_" section of the function names in ConfigDescriptor.h, as most of the routines can now be used in device mode on the
  *    device descriptor
  *  - Renamed functions in the HID parser to have a "USB_" prefix and the acronym "HID" in the name
  *  - Fixed incorrect HID interface class and subclass values in the Mouse and KeyboardMouse demos (thanks to Brian Dickman)
533
  *  - Capitalized the "Descriptor_Search" and "Descriptor_Search_Comp" prefixes of the values in the DSearch_Return_ErrorCodes_t and
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
  *    DSearch_Comp_Return_ErrorCodes_t enums
  *  - Removed "ERROR" from the enum names in the endpoint and pipe stream error code enums
  *  - Renamed the USB_PowerOnErrorCodes_t enum to USB_InitErrorCodes_t, renamed the POWERON_ERROR_NoUSBModeSpecified enum value to
  *    USB_INITERROR_NoUSBModeSpecified
  *  - Renamed USB_PowerOnFail event to USB_InitFailure
  *  - Renamed OTG.h header functions to be more consistent with the rest of the library API
  *  - Changed over all deprecated GCC structure tag initializers to the standardized C99 format (thanks to Mike Alexander)
  *  - USB_HostRequest renamed to USB_ControlRequest, entire control request header is now read into USB_ControlRequest in Device mode
  *    rather than having the library pass only partially read header data to the application
  *  - The USB_UnhandledControlPacket event has had its parameters removed, in favour of accessing the new USB_ControlRequest structure
  *  - The Endpoint control stream functions now correctly send a ZLP to the host when less data than requested is sent
  *  - Fixed USB_RemoteWakeupEnabled flag never being set (the REMOTE WAKEUP Set Feature request was not being handled)
  *  - Renamed the FEATURELESS_CONTROL_ONLY_DEVICE compile-time token to CONTROL_ONLY_DEVICE
  *  - Endpoint configuration is now refined to give better output when all configurations have static inputs - removed the now useless
  *    STATIC_ENDPOINT_CONFIGURATION compile time token
  *  - Fixed SPI driver init function not clearing SPI2X bit when not needed
  *  - Fixed PREVENT ALLOW MEDIUM REMOVAL command issuing in the MassStorageHost demo using incorrect parameters (thanks to Mike Alex)
  *  - Fixed MassStorageHost demo broken due to an incorrect if statement test in MassStore_GetReturnedStatus()
  *  - Fixed reversed signature byte ordering in the CDC bootloader (thanks to Johannes Raschke)
  *  - Changed PIPE_CONTROLPIPE_DEFAULT_SIZE from 8 to 64 to try to prevent problems with faulty devices which do not respect the given
  *    wLength value when reading in the device descriptor
  *  - Fixed missing semicolon in the ATAVRUSBRF01 LED board driver code (thanks to Morten Lund)
  *  - Changed LED board driver code to define dummy LED masks for the first four board LEDs, so that user code can be compiled for boards
  *    with less than four LEDs without code modifications (thanks to Morten Lund)
  *  - Changed HWB board driver to Buttons driver, to allow for the support of future boards with more than one mounted GPIO button
  *  - Serial driver now correctly calculates the baud register value when in double speed mode
  *  - Init function of the Serial driver is now static inline to product smaller code for the common-case of static init values
  *    
  *
  *  \section Sec_ChangeLog090401 Version 090401
  *
  *  - Fixed MagStripe project configuration descriptor containing an unused (blank) endpoint descriptor
  *  - Incorporated makefile changes by Denver Gingerich to retain compatibility with stock (non-WinAVR) AVR-GCC installations
  *  - Fixed makefile EEPROM programming targets programming FLASH data in addition to EEPROM data
  *  - LUFA devices now enumerate correctly with LUFA hosts
  *  - Fixed Configuration Descriptor search routine freezing when a comparator returned a failure
  *  - Removed HID report item serial dump in the MouseHostWithParser and KeyboardHostWithParser - useful only for debugging, and
  *    slowed down the enumeration of HID devices too much
  *  - Increased the number of bits per track which can be read in the MagStripe project to 8192 when compiled for the AT90USBXXX6/7
  *  - Fixed KeyboardMouse demo discarding the wIndex value in the REQ_GetReport request
  *  - USBtoSerial demo now discards all Rx data when not connected to a USB host, rather than buffering characters for transmission
  *    next time the device is attached to a host.
  *  - Added new F_CLOCK compile time constant to the library and makefiles, to give the raw input clock (used to feed the PLL before any
  *    clock prescaling is performed) frequency, so that the PLL prescale mask can be determined
  *  - Changed stream wait timeout counter to be 16-bit, so that very long timeout periods can be set for correct communications with
  *    badly designed hosts or devices which greatly exceed the USB specification limits
  *  - Mass Storage Host demo now uses a USB_STREAM_TIMEOUT_MS of two seconds to maintain compatibility with poorly designed devices
  *  - Function attribute ATTR_ALWAYSINLINE renamed to ATTR_ALWAYS_INLINE to match other function attribute macro naming conventions
  *  - Added ATTR_ALWAYS_INLINE attribute to several key inlined library components, to ensure they are inlined in all circumstances
  *  - Removed SetSystemClockPrescaler() macro, the clock_prescale_set() avr-libc macro has been corrected in recent avr-libc versions
  *  - Fixed incorrect/missing control status stage transfers on demos, bootloaders and applications (thanks to Nate Lawson)
  *  - The NO_CLEARSET_FEATURE_REQUEST compile time token has been renamed to FEATURELESS_CONTROL_ONLY_DEVICE, and its function expanded
  *    to also remove parts of the Get Status chapter 9 request to further reduce code usage
  *  - Makefile updated to include output giving the currently selected BOARD parameter value
  *  - Board Dataflash driver now allows for dataflash ICs which use different shifts for setting the current page/byte address (thanks
  *    to Kenneth Clubb)
  *  - Added DataflashManager_WriteBlocks_RAM() and DataflashManager_ReadBlocks_RAM() functions to the MassStorage demo, to allow for easy
  *    interfacing with a FAT library for dataflash file level access
  *  - Corrected CDC class bootloader to fix a few bugs, changed address counter to store x2 addresses for convenience
  *  - Fixed typos in the SPI driver SPI_SPEED_FCPU_DIV_64 and SPI_SPEED_FCPU_DIV_128 masks (thanks to Markus Zocholl)
  *  - Keyboard and Mouse device demos (normal, data interrupt and fully interrupt driven) combined into unified keyboard and mouse demos
  *  - Keyboard and Mouse host demos (normal and data interrupt driven) combined into unified keyboard and mouse demos
  *  - Removed AVRISP_Programmer project due to code quality concerns
  *  - Fixed CDC demo not sending an empty packet after each transfer to prevent the host from buffering incoming data
  *  - Fixed documentation typos and preprocessor checks relating to misspellings of the USE_RAM_DESCRIPTORS token (thanks to Ian Gregg)
  *  - Fixed USBTask.h not conditionally including HostChapter9.h only when USB_CAN_BE_HOST is defined (thanks to Ian Gregg)
  *  - Fixed incorrect ADC driver init register manipulation (thanks to Tobias)
  *  - Added new GenericHID device demo application
  *  - Fixed Still Image Host SImage_SendData() function not clearing the pipe bank after sending data
  *
  *
  *  \section Sec_ChangeLog090209 Version 090209
  *
  *  - PWM timer mode in AudioOut demo changed to Fast PWM for speed
  *  - Updated Magstripe project to work with the latest hardware revision
  *  - Fixed library not responding to the BCERRI flag correctly in host mode, leading to device lockups
  *  - Fixed library handling Get Descriptor requests when not addressed as standard requests to the device or interface (thanks to
  *    Nate Lawson)
  *  - Fixed serious data corruption issue in MassStorage demo dataflash write routine
  *  - Added new NO_CLEARSET_FEATURE_REQUEST compile time token
  *  - USB task now restores previous global interrupt state after execution, rather than forcing global interrupts to be enabled
  *  - Fixed USB_DeviceEnumerationComplete event firing after each configuration change, rather than once after the initial configuration
  *  - Added ENDPOINT_DOUBLEBANK_SUPPORTED() macros to Endpoint.h, altered ENDPOINT_MAX_SIZE() to allow user to specify endpoint
  *  - ENDPOINT_MAX_ENDPOINTS changed to ENDPOINT_TOTAL_ENDPOINTS, PIPE_MAX_PIPES changed to PIPE_TOTAL_PIPES
  *  - Endpoint and Pipe non-control stream functions now ensure endpoint or pipe is ready before reading or writing
  *  - Changed Teensy bootloader to use a watchdog reset when exiting rather than a software jump
  *  - Fixed integer promotion error in MassStorage and MassStorageHost demos, corrupting read/write transfers
  *  - SPI_SendByte is now SPI_TransferByte, added new SPI_SendByte and SPI_ReceiveByte functions for fast one-way transfer
  *  - MassStorage demo changed to use new fast one-way SPI transfers to increase throughput
  *  - MassStorage handling of Mass Storage Reset class request improved
  *  - Altered MassStorage demo dataflash block read code for speed
  *  - Added USB_IsSuspended global flag
  *  - Simplified internal Dual Mode (OTG) USB library code to reduce code size
  *  - Extended stream timeout period to 100ms from 50ms
  *  - Mass Storage Host demo commands now all return an error code from the Pipe_Stream_RW_ErrorCodes_t enum
  *  - Added SubErrorCode parameter to the USB_DeviceEnumerationFailed event
  *  - VBUS drop interrupt now disabled during the manual-to-auto VBUS delivery handoff
  *  - Simplified low level backend so that device/host mode initialization uses the same code paths
  *  - Added workaround for faulty Mass Storage devices which do not implement the required GET_MAX_LUN request
  *  - Removed buggy Telnet application from the RNDIS demo
  *  - Moved Mass Storage class requests in the Mass Storage Host demo to wrapper functions in MassStoreCommands.c
  *  - Fixed incorrect SCSI command size value in the Request Sense command in MassStoreCommands.c
  *  - Added SetProtocol request to HID class non-parser Mouse and Keyboard demos to force devices to use the correct Boot Protocol
  *  - Added new "dfu" and "flip" programming targets to project makefiles
  *  - HID_PARSE_Sucessful enum member typo corrected to HID_PARSE_Successful
  *  - Changed COLLECTION item structures in the HID descriptor parser to include the collection's Usage Page value
640
  *  - Serial driver now sets Tx line as output, enables pull-up on Rx line
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  *  - Fixed smaller USB AVRs raising multiple connection and disconnection events when NO_LIMITED_CONTROLLER_CONNECT is disabled
  *  - Added HOST_DEVICE_SETTLE_DELAY_MS to give the host delay after a device is connected before it is enumerated
  *  - Fixed KeyboardHostWithParser demo linking against the wrong global variables
  *  - Completed doxygen documentation of remaining library bootloaders, demos and projects
  *  - Fixed incorrect bootloader start address in the TeensyHID bootloader
  *  - Added HWB button whole-disk ASCII dump functionality to MassStoreHost demo
  *  - Replaced printf_P(PSTR("%c"), {Variable}) calls with putchar(<Variable>) for speed and size savings
  *  - Serial driver now accepts baud rates over 16-bits in size, added double speed flag option
  *  - Fixed incorrect callback abort return value in Pipe.c
  *  - Added new flip-ee and dfu-ee makefile targets (courtesy of Opendous Inc.)
  *  - Removed reboot-on-disconnect code from the TeensyHID bootloader, caused problems on some systems
  *  - Fixed AudioOutput and AudioInput demos looping on the endpoint data, rather than processing a sample at a time and returning
  *    each time the task runs to allow for other tasks to execute
  *  - Added support for the Atmel ATAVRUSBRF01 board
  *  - Added AVRISP Programmer Project, courtesy of Opendous Inc.
  *  - Fixed CDC Host demo not searching through both CDC interfaces for endpoints
  *  - Fixed incorrect Product String descriptor length in the DFU class bootloader
  *
  *
  *  \section Sec_ChangeLog081224 Version 081224
  *
  *  - MyUSB name changed to LUFA, the Lightweight USB Framework for AVRs
  *  - Fixed Mass Storage Host demo's MassStore_SendCommand() delay in the incorrect place
  *  - Fixed USBtoSerial demo not calling ReconfigureUSART() after a change in the line encoding
  *  - Fixed infinite loop in host mode Host-to-Device control transfers with data stages
  *  - HID report parser now supports devices with multiple reports in one interface via Report IDs
  *  - Fixed RZUSBSTICK board LED driver header incorrect macro definition order causing compile errors
  *  - Calling USB_Init() when the USB interface is already configured now forces a complete interface reset
  *    and re-enumeration - fixes MyUSB DFU bootloader not switching to app code correctly when soft reset used
  *  - Fixed "No newline at end of file" warning when stream callbacks are enabled
  *  - DFU bootloader now uses fixed signature bytes per device, rather than reading them out dynamically for size
  *  - Added new FIXED_CONTROL_ENDPOINT_SIZE and USE_SINGLE_DEVICE_CONFIGURATION switches to statically define certain values to
  *    reduce compiled binary size
  *  - Added new NO_LIMITED_CONTROLLER_CONNECT switch to prevent the library from trying to determine bus connection
  *    state from the suspension and wake up events on the smaller USB AVRs
  *  - Added summary of all library compile time tokens to the documentation
  *  - Added overview of the LUFA scheduler to the documentation
  *  - Removed MANUAL_PLL_CONTROL compile time token, replaced with a mask for the USB_Init() Options parameter
  *  - CDC bootloader now uses the correct non-far or far versions of the pgm_* functions depending on if RAMPZ is defined
  *  - Doxygen documentation now contains documentation on all the projects, bootloaders and most demos included with the library
  *  - CDC bootloader now runs user application when USB disconnected rather than waiting for a hard reset
  *  - MouseHostWithParser and KeyboardHostWithParser now support multiple-report devices
  *  - RNDIS demo can now close connections correctly using the new TCP_APP_CLOSECONNECTION() macro - used in Webserver  
  *  - Fixed the DFU bootloader, no longer freezes up when certain files are programmed into an AVR, made reading/writing faster
  *  - Fixed mouse/joystick up/down movements reversed - HID mouse X/Y coordinates use a left-handed coordinate system, not a normal 
  *    right-handed system
  *  - Added stub code to the CDC and USBtoSerial demos showing how to read and set the RS-232 handshake lines - not currently used in
  *    the demos, but the example code and supporting defines are now in place
  *  - Interrupts are now disabled when processing a control request in device mode, to avoid exceeding the strict control request
  *    timing requirements.
  *  - All demos now use a central StatusUpdate() function rather than direct calls to the board LED functions, so that the demos can
  *    easily be altered to show different LED combinations (or do something else entirely) as the demo's status changes
  *  - Removed LED commands from the CDC bootloader, unused by most AVR910 programming software
  *  - Fixed RNDIS demo ICMP ping requests echoing back incorrect data
  *  - Added DHCP server code to RNDIS demo, allowing for hands-free auto configuration on any PC
  *  - Fixed DFU bootloader PID value for the ATMEGA16U4 AVR
  *  - Endpoint and Pipe configuration functions now return an error code indicating success or failure
  *  - USB Reset in device mode now resets and disables all device endpoints
  *  - Added intermediate states to the host mode state machine, reducing the USB task blocking time to no more than 1ms explicitly per
  *    invocation when in host mode
  *  - Added support for the ATMEGA32U6 microcontroller
  *  - Added STATIC_ENDPOINT_CONFIGURATION compile time option, enabled in the bootloaders to minimize space usage
  *  - Removed redundant code from the USB device GetStatus() chapter 9 processing routine
  *  - Added new TeensyHID bootloader, compatible with the Teensy HID protocol (http://www.pjrc.com/teensy/)
  *  - Versions are now numbered by release dates, rather than arbitrary major/minor revision numbers
  *  - USB_RemoteWakeupEnabled is now correctly set and cleared by SetFeature and ClearFeature requests from the host
  *  - Changed prototype of GetDescriptor, so that it now returns the descriptor size (or zero if the descriptor doesn't exist)
  *    rather than passing the size back to the caller through a parameter and returning a boolean
  *
  *
  *  \section Sec_ChangeLog153 Version 1.5.3 - Released 2nd October, 2008
  *
  *  - Fixed CDC bootloader using pgmspace macros for some descriptors inappropriately
  *  - Updated all Mouse and Keyboard device demos to include boot protocol support (now works in BIOS)
  *  - Renamed bootloader directories to remove spaces, which were causing build problems on several OSes
  *  - Removed serial number strings from all but the MassStore demo where it is required - users were not
  *    modifying the code to either omit the descriptor or use a unique serial per device causing problems
  *    when multiple units of the same device were plugged in at the same time
  *  - AudioOutput and AudioInput demos now correctly silence endpoints when not enabled by the host
  *  - Added KeyboardMouse demo (Keyboard and Mouse functionality combined into a single demo)
  *  - Added DriverStubs directory to house board level driver templates, to make MyUSB compatible custom board
  *    driver creation easier
  *  - Extended MassStorage demo to support multiple LUNs, 2 by default
  *  - Fixed incorrect device address mask, preventing the device from enumerating with addresses larger than 63
  *  - Fixed incorrect data direction mask in the GetStatus standard request, preventing it from being handled
  *  - Fixed incorrect GetStatus standard request for endpoints, now returns the endpoint STALL status correctly
  *  - Added in new USB_RemoteWakeupEnabled and USB_CurrentlySelfPowered flags rather than using fixed values
  *  - Added DualCDC demo to demonstrate the use of Interface Association Descriptors
  *  - Added pipe NAK detection and clearing API
  *  - Added pipe status change (NAK, STALL, etc.) interrupt API
  *  - Fixed MassStorageHost demo so that it no longer freezes randomly when issuing several commands in a row
  *  - Host demos configuration descriptor routines now return a unique error code when the returned data does
  *    not have a valid configuration descriptor header
  *  - Added Endpoint_WaitUntilReady() and Pipe_WaitUntilReady() functions
  *  - Stream functions now have software timeouts, timeout period can be set by the USB_STREAM_TIMEOUT_MS token
  *  - All demos now pass the USB.org automated Chapter 9 device compliance tests
  *  - All HID demos now pass the USB.org automated HID compliance tests
  *  - Polling interval of the interrupt endpoint in the CDC based demos changed to 0xFF to fix problems on Linux systems
  *  - Changed stream functions to accept a new callback function, with NO_STREAM_CALLBACKS used to disable all callbacks
  *  - Mass Storage demo dataflash management routines changed to use the endpoint stream functions		
  *  - Added AVRStudio project files for each demo in addition to the existing Programmer's Notepad master project file
  *  - Re-added call to ReconfigureUSART() in USBtoSerial SetLineCoding request, so that baud rate changes
  *    are reflected in the hardware (change was previously lost)
  *
  *
  *  \section Sec_ChangeLog152 Version 1.5.2 - Released 31st July, 2008
  *
  *  - Fixed SwapEndian_32() function in Common.h so that it now works correctly (wrong parameter types)
  *  - Updated RNDIS demo - notification endpoint is no longer blocking so that it works with faulty Linux RNDIS
  *    implementations (where the notification endpoint is ignored in favour of polling the control endpoint)
  *  - Fixed incorrect Vendor Description string return size in RNDIS demo for the OID_GEN_VENDOR_DESCRIPTION OID token
  *  - Added very basic TCP/IP stack and HTTP/TELNET servers to RNDIS demo
  *  - Fixed DFU bootloader exit causing programming software to complain about failed writes
  *  - Fixed DFU bootloader EEPROM programming mode wiping first flash page
  *  - Fixed Clear/Set Feature device standard request processing code (fixing MassStorage demo in the process)
  *  - Added support for the ATMEGA16U4 AVR microcontroller
757
  *  - Library license changed from LGPLv3 to MIT license
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  *
  *
  *  \section Sec_ChangeLog151 Version 1.5.1 - Released 31st July, 2008
  *
  *  - Changed host demos to enable the host function task on the firing of the USB_DeviceEnumerationComplete event
  *    rather than the USB_DeviceAttached event
  *  - HID Usage Stack now forcefully cleared after an IN/OUT/FEATURE item has been completely processed to remove
  *    any referenced but not created usages
  *  - Changed USB_INT_DisableAllInterrupts() and USB_INT_ClearAllInterrupts(), USB_Host_GetNextDescriptorOfType(),
  *    USB_Host_GetNextDescriptorOfTypeBefore(), USB_Host_GetNextDescriptorOfTypeAfter() to normal functions (from inline)
  *  - Fixed USBtoSerial demo not sending data, only receiving
  *  - Fixed main makefile to make all by default, fixed MagStripe directory case to prevent case-sensitive path problems
  *  - ConfigDescriptor functions made normal, instead of static inline
  *  - Pipe/Endpoint *_Ignore_* functions changed to *_Discard_*, old names still present as aliases
  *  - Fixed ENDPOINT_MAX_SIZE define to be correct on limited USB controller AVRs
  *  - Changed endpoint and pipe size translation routines to use previous IF/ELSE IF cascade code, new algorithmic
  *    approach was buggy and caused problems
  *  - Bootloaders now compile with -fno-inline-small-functions option to reduce code size
  *  - Audio demos now use correct endpoint sizes for full and limited controller USB AVRs, double banking in all cases
  *    to be in line with the specification (isochronous endpoints MUST be double banked)
  *  - Added Interface Association descriptor to StdDescriptors.h, based on the relevant USB2.0 ECN
  *  - Fixed MIDI demo, corrected Audio Streaming descriptor to follow the MIDI-specific AS structure
  *  - Fixed HID class demo descriptors so that the HID interface's protocol is 0x00 (required for non-boot protocol HID
  *    devices) to prevent problems on hosts expecting the boot protocol functions to be supported
  *  - Added read/write control stream functions to Endpoint.h
  *  - Fixed AudioOut demo not setting port pins to inputs on USB disconnect properly
  *  - Added RNDISEthernet demo application
  *
  *
  *  \section Sec_ChangeLog150 Version 1.5.0 - Released 10 June, 2008
  *
  *  - Fixed MIDI demo, now correctly waits for the endpoint to be ready between multiple note messages
  *  - Added CDC Host demo application
  *  - Added KeyboardFullInt demo application
  *  - Endpoint and Pipe creation routines now mask endpoint/pipe size with the size mask, to remove transaction
  *    size bits not required for the routines (improves compatibility with devices)
  *  - Fixed AudioInput demo - now correctly sends sampled audio to the host PC
  *  - Fixed AudioOutput demo once more -- apparently Windows requires endpoint packets to be >=192 bytes
  *  - Shrunk round-robbin scheduler code slightly via the use of struct pointers rather than array indexes
  *  - Fixed off-by-one error when determining if the Usage Stack is full inside the HID Report parser
  *  - Renamed Magstripe.h to MagstripeHW.h and moved driver out of the library and into the MagStripe demo folder
  *  - Added preprocessor checks to enable C linkage on the library components when used with a C++ compiler
  *  - Added Still Image Host demo application
  *  - The USB device task now restores the previously selected endpoint, allowing control requests to be transparently
  *    handled via interrupts while other endpoints are serviced through polling
  *  - Fixed device signature being sent in reverse order in the CDC bootloader
  *  - Host demos now have a separate ConfigDescriptor.c/.h file for configuration descriptor processing
  *  - HostWithParser demos now have a separate HIDReport.c/.h file for HID report processing and dumping
  *  - Removed non-mandatory commands from MassStorage demo to save space, fixed SENSE ResponseCode value
  *  - CDC demos now send empty packets after sending a full one to prevent buffering issues on the host
  *  - Updated demo descriptors to use VID/PID values donated by Atmel
  *  - Added DoxyGen documentation to the source files
  *  - Fixed Serial_IsCharReceived() definition, was previously reversed
  *  - Removed separate USB_Descriptor_Language_t descriptor, USB_Descriptor_String_t is used instead
  *  - Removed unused Device Qualifier descriptor structure
  *  - Renamed the USB_CreateEndpoints event to the more appropriate USB_ConfigurationChanged
  *  - Fixed MassStorageHost demo reading in the block data in reverse
  *  - Removed outdated typedefs in StdRequestType.h, superseded by the macro masks
  *  - Corrected OTG.h is now included when the AVR supports both Host and Device modes, for creating OTG products
  *  - USB_DeviceEnumerationComplete event is now also fired when in device mode and the host has finished its enumeration
  *  - Interrupt driven demos now properly restore previously selected endpoint when ISR is complete
819
  *  - The value of USB_HOST_TIMEOUT_MS can now be overridden in the user project makefile to a custom fixed timeout value
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  *  - Renamed USB_Host_SOFGeneration_* macros to more friendly USB_Host_SuspendBus(), USB_Host_ResumeBus()
  *    and USB_Host_IsBusSuspended()
  *  - Renamed *_*_Is* macros to *_Is* to make all flag checking macros consistent, Pipe_SetInterruptFreq() is now
  *    Pipe_SetInterruptPeriod() to use the correct terminology
  *  - UnicodeString member of USB_Descriptor_String_t struct changed to an ordinary int array type, so that the GCC
  *    Unicode strings (prefixed with an L before the opening quotation mark) can be used instead of explicit arrays
  *    of ASCII characters
  *  - Fixed Endpoint/Pipes being configured incorrectly if the maximum endpoint/pipe size for the selected USB AVR
  *    model was given as the bank size
  *  - HID device demos now use a true raw array for the HID report descriptor rather than a struct wrapped array
  *  - Added VERSION_BCD() macro, fixed reported HID and USB version numbers in demo descriptors
  *  - Cleaned up GetDescriptor device chapter 9 handler function
  *  - Added GET_REPORT class specific request to HID demos to make them complaint to the HID class
  *  - Cleaned up setting of USB_IsInitialized and USB_IsConnected values to only when needed
  *  - Removed Atomic.c and ISRMacro.h; the library was already only compatible with recent avr-lib-c for other reasons
  *  - All demos and library functions now use USB standardized names for the USB data (bRequest, wLength, etc.)
  *  - Added USE_NONSTANDARD_DESCRIPTOR_NAMES token to switch back to the non-standard descriptor element names
  *
  *
  *  \section Sec_ChangeLog141 Version 1.4.1 - Released 5 May, 2008
  *
  *  - Enhanced KeyboardWithParser demo, now prints out pressed alphanumeric characters like the standard demo
  *  - Fixed MassStorage demo, read/writes using non mode-10 commands now work correctly
  *  - Corrected version number in Version.h
  *
  *
  *  \section Sec_ChangeLog140 Version 1.4.0 - Released 5 May, 2008
  *
  *  - Added HID Report Parser API to the library
  *  - Added Mouse and Keyboard host demo applications, using the new HID report parser engine
  *  - Added MouseFullInt demo, which demonstrates a fully interrupt (including control requests) mouse device
  *  - Fixed incorrect length value in the audio control descriptor of the AudioOutput and AudioInput demos
  *  - Added MIDI device demo application to the library
  *  - Fixed problem preventing USB devices from being resumed from a suspended state
  *  - Added new CDC class bootloader to the library, based on the AVR109 bootloader protocol
  *  - Added header to each demo application indicating the mode, class, subclass, standards used and supported speed
  *  - Functions expecting endpoint/pipe numbers are no longer automatically masked against ENDPOINT_EPNUM_MASK or
  *    PIPE_PIPENUM_MASK - this should be manually added to code which requires it
  *  - Fixed DFU class bootloader - corrected frequency of flash page writes, greatly reducing programming time
  *  - Renamed AVR_HOST_GetDeviceConfigDescriptor() to USB_Host_GetDeviceConfigDescriptor() and AVR_HOST_GetNextDescriptor()
  *    to USB_Host_GetNextDescriptor()
  *  - Added new USB_Host_GetNextDescriptorOfTypeBefore() and USB_Host_GetNextDescriptorOfTypeAfter() routines
  *  - Moved configuration descriptor routines to MyUSB/Drivers/USB/Class/, new accompanying ConfigDescriptors.c file
  *  - Added new configuration descriptor comparator API for more powerful descriptor parsing, updated host demos to use the
  *    new comparator API
  *  - Fixed MassStorageHost demo capacity printout, and changed data read/write mode from little-endian to the correct
  *    big-endian for SCSI devices
  *  - Fixed macro/function naming consistency; USB_HOST is now USB_Host, USB_DEV is now USB_Device
  *  - Added better error reporting to host demos
  *  - Added 10 microsecond delay after addressing devices in host mode, to prevent control stalls
  *
  *
  *  \section Sec_ChangeLog132 Version 1.3.2 - Released April 1st, 2008
  *
  *  - Added call to ReconfigureUSART() in USBtoSerial SetLineCoding request, so that baud rate changes
  *    are reflected in the hardware
  *  - Fixed CDC and USBtoSerial demos - Stream commands do not work for control endpoints, and the 
  *    GetLineCoding request had an incorrect RequestType mask preventing it from being processed
  *  - Improved reliability of the USBtoSerial demo, adding a busy wait while the buffer is full
  *  - Device control endpoint size is now determined from the device's descriptors rather than being fixed
  *  - Separated out SPI code into new SPI driver in AT90USBXXX driver directory
  *  - Bootloader now returns correct PID for the selected USB AVR model, not just the AT90USB128X PID
  *  - Added support for the RZUSBSTICK board
  *  - Bicolour driver removed in favour of generic LEDs driver
  *  - Added support for the ATMEGA32U4 AVR
  *  - Added MANUAL_PLL_CONTROL compile time option to prevent the USB library from manipulating the PLL
  *
  *
  *  \section Sec_ChangeLog131 Version 1.3.1 - Released March 19th 2008
  *
  *  - Fixed USB to Serial demo - class value in the descriptors was incorrect
  *  - Control endpoint size changed from 64 bytes to 8 bytes to save on USB FIFO RAM and to allow low
  *    speed mode devices to enumerate properly
  *  - USB to Serial demo data endpoints changed to dual-banked 16 byte to allow the demo to work
  *    on USB AVRs with limited USB FIFO RAM
  *  - Changed demo endpoint numbers to use endpoints 3 and 4 for double banking, to allow limited
  *    USB device controller AVRs (AT90USB162, AT90USB82) to function correctly
  *  - Updated Audio Out demo to use timer 1 for AVRs lacking a timer 3 for the PWM output
  *  - Fixed incorrect USB_DEV_OPT_HIGHSPEED entry in the Mass Storage device demo makefile
  *  - Optimized Mass Storage demo for a little extra transfer speed
  *  - Added LED indicators to the Keyboard demo for Caps Lock, Num Lock and Scroll Lock
  *  - Added Endpoint_Read_Stream, Endpoint_Write_Stream, Pipe_Read_Stream and Pipe_Write_Stream functions
  *    (including Big and Little Endian variants)
  *  - Made Dataflash functions inline for speed, removed now empty Dataflash.c driver file
  *  - Added new SetSystemClockPrescaler() macro (thanks to Joerg Wunsch)
  *  - Fixed Endpoint_ClearStall() to function correctly on full USB controller AVRs (AT90USBXXX6/7)
  *  - Endpoint_Setup_In_Clear() and Endpoint_Setup_Out_Clear() no longer set FIFOCON, in line with the
  *    directives in the datasheet
  *  - Fixed PLL prescaler defines for all AVR models and frequencies
  *  - Fixed ENDPOINT_INT_IN and ENDPOINT_INT_OUT definitions
  *  - Added interrupt driven keyboard and mouse device demos
  *  - Combined USB_Device_ClearFeature and USB_Device_SetFeature requests into a single routine for code
  *    size savings
  *  - Added missing Pipe_GetCurrentPipe() macro to Pipe.h
  *
  *
  *  \section Sec_ChangeLog130 Version 1.3.0 - Released March 7th 2008
  *
  *  - Unnecessary control endpoint config removed from device mode
  *  - Fixed device standard request interpreter accidentally processing some class-specific requests
  *  - Added USE_RAM_DESCRIPTORS and USE_EEPROM_DESCRIPTORS compile time options to instruct the library
  *    to use descriptors stored in RAM or EEPROM rather than flash memory
  *  - All demos now disable watchdog on startup, in case it has been enabled by fuses or the bootloader
  *  - USB_DEV_OPT_LOWSPEED option now works correctly
  *  - Added ability to set the USB options statically for a binary size reduction via the USE_STATIC_OPTIONS
  *    compile time define
  *  - USB_Init no longer takes a Mode parameter if compiled for a USB device with no host mode option, or
  *    if forced to a particular mode via the USB_HOST_ONLY or USB_DEVICE_ONLY compile time options
  *  - USB_Init no longer takes an Options parameter if options statically configured by USE_STATIC_OPTIONS
  *  - Endpoint_Ignore_* and Pipe_Ignore_* made smaller by making the dummy variable non-volatile so that the
  *    compiler can throw away the result more efficiently
  *  - Added in an optional GroupID value to each scheduler entry, so that groups of tasks can once again be
  *    controlled by the new Scheduler_SetGroupTaskMode() routine
  *  - Added support for AT90USB162 and AT90USB82 AVR models
  *  - Added support for the STK525 and STK526 boards
  *  - Added support for custom board drivers to be supplied by selecting the board type as BOARD_USER, and
  *    placing board drivers in {Application Directory}/Board/
  *  - PLL is now stopped and USB clock is frozen when detached from host in device mode, to save power
  *  - Joystick defines are now in synch with the schematics - orientation will be rotated for the USBKEY
  *  - Fixed USB_DEV_IsUSBSuspended() - now checks the correct register
  *  - Fixed data transfers to devices when in host mode
  *  - Renamed USB_DEV_OPT_HIGHSPEED to USB_DEV_OPT_FULLSPEED and USB_HOST_IsDeviceHighSpeed() to
  *    USB_HOST_IsDeviceFullSpeed() to be in line with the official USB speed names (to avoid confusion with
  *    the real high speed mode, which is unavailable on the USB AVRs)
  *
  *
  *  \section Sec_ChangeLog120 Version 1.2.0 - Released February 4th, 2008
  *
  *  - Added USB_DeviceEnumerationComplete event for host mode
949
  *  - Added new Scheduler_Init routine to prepare the scheduler, so that tasks can be started and
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
  *    stopped before the scheduler has been started (via Scheduler_Start)
  *  - Connection events in both Device and Host mode are now interrupt-driven, allowing the USB management
  *    task to be stopped when the USB is not connected to a host or device
  *  - All demos updated to stop the USB task when not in use via the appropriate USB events
  *  - Mass Storage Host demo application updated to function correctly with all USB flash disks
  *  - Mass Storage Host demo application now prints out the capacity and number of LUNs in the attached
  *    device, and prints the first block as hexadecimal numbers rather than ASCII characters
  *  - Endpoint and Pipe clearing routines now clear the Endpoint/Pipe interrupt and status flags
  *  - Shifted error handling code in the host enum state machine to a single block, to reduce code complexity
  *  - Added in DESCRIPTOR_TYPE, DESCRIPTOR_SIZE and DESCRIPTOR_CAST macros to make config descriptor processing
  *    clearer in USB hosts and DESCRIPTOR_ADDRESS for convenience in USB devices
  *  - Added in alloca macro to common.h, in case the user is using an old version of avr-lib-c missing the macro
  *
  *
  *  \section Sec_ChangeLog130 Version 1.1.0 - Released January 25th 2008
  *
  *  - Fixed DCONNI interrupt being enabled accidentally after a USB reset
  *  - Fixed DDISCI interrupt not being disabled when a device is not connected
968
  *  - Added workaround for powerless pull-up devices causing false disconnect interrupts
969 970 971 972 973 974 975 976 977 978 979
  *  - Added USB_DeviceEnumerationFailed event for Host mode
  *  - AVR_HOST_GetDeviceConfigDescriptor routine no longer modifies ConfigSizePtr if a valid buffer
  *    pointer is passed
  *  - Added ALLOCABLE_BYTES to DynAlloc, and added code to make the size of key storage variables
  *    dependant on size of memory parameters passed in via the user project's makefile
  *  - Fixed incorrect device reset routine being called in USBTask
  *  - Devices which do not connect within the standard 300mS are now supported
  *  - Removed incorrect ATTR_PURE from Scheduler_SetTaskMode(), which was preventing tasks from being
  *    started/stopped, as well as USB_InitTaskPointer(), which was breaking dual device/host USB projects
  *  - Changed scheduler to use the task name rather than IDs for setting the task mode, eliminating the
  *    need to have a task ID list
980 981
  *  - ID transition interrupt now raises the appropriate device/host disconnect event if device attached
  *  - Fixed double VBUS change (and VBUS -) event when detaching in device mode
982 983 984 985
  *  - Added ability to disable ANSI terminal codes by the defining of DISABLE_TERMINAL_CODES in makefile
  *  - Removed return from ConfigurePipe and ConfigureEndpoint functions - use Pipe_IsConfigured() and 
  *    Endpoint_IsConfigured() after calling the config functions to determine success
  */