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+/** \file
+ *
+ *  This file contains special DoxyGen information for the generation of the main page and other special
+ *  documentation pages. It is not a project source file.
+ */
+
+/** \page Page_Migration Migrating from Older Versions
+ *
+ *  Below is migration information for updating existing projects based on previous versions of the LUFA library
+ *  to the next version released. It does not indicate all new additions to the library in each version change, only
+ *  areas relevant to making older projects compatible with the API changes of each new release.
+ *
+ *  \section Sec_Migration170418 Version 170418
+ *  <b>Device Mode</b>
+ *   - The \c CALLBACK_USB_GetDescriptor() callback function into the user application's \c wIndex parameter is now \c uint16_t, not \c uint8_t.
+ *
+ *  \section Sec_Migration151115 Migrating from 140928 to 151115
+ *  <b>Non-USB Library Components</b>
+ *    - The ATPROGRAM LUFA build system module now defaults to the Atmel ICE debugger tool, instead of the Atmel JTAG ICE3.
+ *    - The \c Serial_CreateStream() and \c Serial_CreateBlockingStream() functions now require a USART base pointer for XMEGA devices as the first parameter.
+ *
+ *  \section Sec_Migration140928 Migrating from 140302 to 140928
+ *  <b>Device Mode</b>
+ *    - The device mode RNDIS class driver now requires a user-supplied buffer and buffer length to operate, rather
+ *      than allocating this buffer internally.
+ *
+ *  \section Sec_Migration140302 Migrating from 130901 to 140302
+ *  <b>USB Core</b>
+ *    - The \c VERSION_BCD() macro has changed from accepting one floating point parameter to taking three distinct major/minor/revision integer parameters, as
+ *      some edge cases caused incorrect parsing of the input float into the final integer BCD encoded value.
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - The \c ATTR_NEVER_INLINE macro, erroneously introduced in a previous release has been removed, as it duplicates the existing \c ATTR_NO_INLINE macro.
+ *
+ *  <b>Build System</b>
+ *    - The default configuration file for Doxygen is now "doxyfile" rather than "Doxygen.conf", to conform to the Doxygen project's own default file name.
+ *      Set \c DOXYGEN_CONF to override the new default file name.
+ *
+ *  \section Sec_Migration130901 Migrating from 130303 to 130901
+ *  <b>Non-USB Library Components</b>
+ *    - The Board Dataflash \c Dataflash_Init() function now automatically configures the appropriate communication interface.
+ *
+ *  \section Sec_Migration130303 Migrating from 120730 to 130303
+ *  <b>Device Mode</b>
+ *    - The \ref HID_KEYBOARD_LED_KANA macro was previously misspelled as \c HID_KEYBOARD_LED_KATANA, and had an incorrect value. User applications requiring this
+ *      constant should use the new name, and remove any workarounds for the previously incorrect macro definition.
+ *    - The \c HID_KEYBOARD_SC_EQUAL_SIGN macro has been renamed to \ref HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN, and the previous definition of
+ *      \c HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN has been renamed \ref HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN_AS400 to conform to the definitions in the HID specification.
+ *
+ *  <b>Host Mode</b>
+ *    - The \ref HID_KEYBOARD_LED_KANA macro was previously misspelled as \c HID_KEYBOARD_LED_KATANA, and had an incorrect value. User applications requiring this
+ *      constant should use the new name, and remove any workarounds for the previously incorrect macro definition.
+ *    - The \c HID_KEYBOARD_SC_EQUAL_SIGN macro has been renamed to \ref HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN, and the previous definition of
+ *      \c HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN has been renamed \ref HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN_AS400 to conform to the definitions in the HID specification.
+ *
+ *  \section Sec_Migration120730 Migrating from 120219 to 120730
+ *  <b>Device Mode</b>
+ *    - The device mode Audio Class driver now requires an additional configuration parameter, the Audio Control interface index. Existing applications should
+ *      be adjusted to specify the additional configuration parameter.
+ *    - The HID_DESCRIPTOR_JOYSTICK() macro no longer takes a variable number of axis as a parameter, due to OS incompatibilities; this macro now uses a fixed
+ *      3 axis of data. User applications should update their calls to this macro and their report structures to suit a fixed 3-axis joystick report. If a user
+ *      application requires more than 3 axis' of data, a custom report descriptor will need to be constructed by hand.
+ *    - The \ref Endpoint_ConfigureEndpoint() function no longer takes in masks for the banks and direction; the number of banks is now an integer argument, and
+ *      the direction is obtained from the full endpoint address within the device. Applications calling Endpoint_ConfigureEndpoint() should update their API
+ *      call to use a full endpoint address (including ENDPOINT_DIR_IN or ENDPOINT_DIR_OUT direction in the MSB of the endpoint address) and an integer number
+ *      of banks.
+ *    - All endpoint functions now operate on full endpoint addresses within the device, rather than a directionless endpoint index. Applications should update
+ *      their API calls to use full endpoint addresses when required within the device.
+ *    - All device mode class drivers have been updated to use a new unified endpoint description structure for all endpoints; existing applications will need
+ *      to update their class driver struct instantiation to match the new scheme (see \ref USB_Endpoint_Table_t).
+ *    - The \c ENDPOINT_BANKS_SUPPORTED() and \c ENDPOINT_MAX_ENDPOINT_SIZE() macros have been removed, as these do not function correctly with the new addressing
+ *      scheme for the endpoint APIs. Please refer to the target device's datasheet for the maximum bank size of each endpoint.
+ *    - The MIDI class driver \ref MIDI_EventPacket_t event packet no longer contains separate \c CableIndex and \c Command entries; these have been combined
+ *      into a single \c Event element which can be constructed using the new macro \ref MIDI_EVENT(). Existing applications should use the new macro and structure
+ *      element name.
+ *
+ *  <b>Host Mode</b>
+ *    - The Android Accessory Host class driver property strings are now a array of \c char* rather than a struct of named pointers. Existing applications
+ *      should use C99 Designated Initializers with the property string indexes located in \ref AOA_Strings_t instead.
+ *    - The \ref Pipe_ConfigurePipe() function no longer takes in masks for the banks and token; the number of banks is now an integer argument, and the token
+ *      is now inferred from the full pipe address within the device, and the pipe type. Applications calling Pipe_ConfigurePipe() should update their API
+ *      call to use a full pipe address (including PIPE_DIR_IN or PIPE_DIR_OUT direction in the MSB of the pipe address) and an integer number of banks.
+ *    - All pipe functions now operate on full pipe addresses within the device, rather than a directionless pipe index. Applications should update their API
+ *      calls to use full pipe addresses when required within the device.
+ *    - All host mode class drivers have been updated to use a new unified pipe description structure for all pipes; existing applications will need to update
+ *      their class driver struct instantiation to match the new scheme (see \ref USB_Pipe_Table_t).
+ *    - The MIDI class driver \ref MIDI_EventPacket_t event packet no longer contains seperate \c CableIndex and \c Command entries; these have been combined
+ *      into a single \c Event element which can be constructed using the new macro \ref MIDI_EVENT(). Existing applications should use the new macro and structure
+ *      element name.
+ *    - The library "LUFA/Drivers/USB/Core/ConfigDescriptor.c" source file has been renamed "LUFA/Drivers/USB/Core/ConfigDescriptors.c" as this was clashing with
+ *      files in some low level host mode demo applications, preventing parallel project builds. If you are referencing the project source files directly instead
+ *      of using the makefile module names, you will need to adjust your project makefile.
+ *
+ *  \section Sec_Migration120219 Migrating from 111009 to 120219
+ *  <b>USB Core</b>
+ *    - The HID_KEYBOARD_MODIFER_* macros in the HID class driver have been corrected to HID_KEYBOARD_MODIFIER_* (note the spelling of "modifier").
+ *      Existing applications should switch over to the correctly spelled macro names.
+ *    - The names of the USB Device and USB Host class driver files have changed; a new "ClassDevice" and "ClassHost" postfix has been added to the
+ *      respective class driver files. Projects referencing the class driver source files by filename rather than the LUFA_SRC_USBCLASS makefile
+ *      variable should append these postfixes to the source file names. Projects including the USB class driver dispatch headers directly should either
+ *      switch to including the main USB driver header instead, or use the updated header filenames.
+ *    - The USB_CONFIG_ATTR_BUSPOWERED constant has been renamed to USB_CONFIG_ATTR_RESERVED, as this was misnamed. All devices must set this bit in
+ *      the Configuration descriptor's attributes field. As all devices are assumed to be bus-powered unless stated otherwise with the
+ *      USB_CONFIG_ATTR_SELFPOWERED flag a replacement constant for bus powered devices is not provided.
+ *
+ *  <b>Device Mode</b>
+ *    - The device mode Audio class driver now requires a new user application callback, \ref CALLBACK_Audio_Device_GetSetInterfaceProperty().
+ *      Existing applications must implement this new callback, however if no audio entities are defined in the audio device's descriptors,
+ *      this function may be hard-coded to always return false for previous behaviour to be retained.
+ *
+ *  \section Sec_Migration111009 Migrating from 110528 to 111009
+ *  <b>Non-USB Library Components</b>
+ *    - The \c JTAG_DEBUG_ASSERT() macro has been renamed \ref JTAG_ASSERT() to be consistent with \ref STDOUT_ASSERT().
+ *
+ *  <b>USB Core</b>
+ *    - By default, unordered Endpoint and Pipe configuration is now allowed once again, via the previous workaround of
+ *      reconfiguring all Endpoints/Pipes in order each time a new Endpoint/Pipe is created. To minimize the compiled program
+ *      size, the new \c ORDERED_EP_CONFIG compile time option may be defined in the project makefile to restrict the ordering
+ *      in exchange for a smaller compiled binary size.
+ *    - The previous \c F_CLOCK symbol, required in the project makefile, has been renamed to \c F_USB. This is due to the previous name
+ *      being far too generic for use in future architecture ports, where multiple clock domains are used.
+ *
+ *  <b>Device Mode</b>
+ *    - The Endpoint stream functions now all require a \c BytesProcessed parameter instead of the previous callback parameter.
+ *      This should be set to \c NULL to retain previous behaviour of the functions, or point to a location where the number of bytes
+ *      processed in the current transaction can be stored. If the \c BytesProcessed parameter is non \c NULL, each time the endpoint
+ *      bank becomes full and the packet is sent, the routine will exit with the new \ref ENDPOINT_RWSTREAM_IncompleteTransfer
+ *      error code to allow the user application to determine when to send the next chunk of data.
+ *    - The \ref CDC_Device_SendString() function now expects a null terminated string instead of an explicit length. Existing code
+ *      should use the new \ref CDC_Device_SendData() function, or remove the length parameter from the function call.
+ *    - The \c Endpoint_ResetFIFO() function has been renamed to \ref Endpoint_ResetEndpoint(), to make the API function names more
+ *      consistent. Existing applications using the old function name should simply replace it with a call to the new function name.
+ *    - The \c Endpoint_*_Byte() functions have been renamed Endpoint_*_8() to ensure they are correct across all architectures. Existing
+ *      code using these functions should replace the previous function names with the new function names.
+ *    - The \c Endpoint_*_Word() functions have been renamed Endpoint_*_16() to ensure they are correct across all architectures. Existing
+ *      code using these functions should replace the previous function names with the new function names.
+ *    - The \c Endpoint_*_DWord() functions have been renamed Endpoint_*_32() to ensure they are correct across all architectures. Existing
+ *      code using these functions should replace the previous function names with the new function names.
+ *    - The Device mode RNDIS class driver no longer stores the incoming and outgoing packets in the class driver instance; the user is
+ *      now expected to manually define a storage location for the packet data. Packets must now be sent and received manually via a call
+ *      to \ref RNDIS_Device_ReadPacket() and/or \ref RNDIS_Device_SendPacket().
+ *    - The definition of the Audio class \ref USB_Audio_Descriptor_Format_t has been altered, to remove the fixed singular
+ *      audio sample rate in the descriptor definition, and to rename the \c SampleFrequencyType to the more appropriate
+ *      \c TotalDiscreteSampleRates. Existing applications will need to add an array of \ref USB_Audio_SampleFreq_t elements
+ *      immediately following any \ref USB_Audio_Descriptor_Format_t descriptors, and insert the appropriate sampling rates
+ *      supported by the device, as well as rename the descriptor elements to match the updated element names.
+ *    - The device mode Audio class driver now requires a new user application callback, \ref CALLBACK_Audio_Device_GetSetEndpointProperty().
+ *      Existing applications must implement this new callback, however if multiple sample rates or pitch control is not used,
+ *      this function may be hard-coded to always return false for previous behaviour to be retained.
+ *    - The \c USB_ConfigurationNumber, \c USB_RemoteWakeupEnabled and \c USB_CurrentlySelfPowered globals have been renamed to
+ *      \ref USB_Device_ConfigurationNumber, \ref USB_Device_RemoteWakeupEnabled and \ref USB_Device_CurrentlySelfPowered to clearly indicate
+ *      the USB mode they relate to. Existing applications using these variables should rename all references to the previous names.
+ *    - The \c ENDPOINT_DESCRIPTOR_DIR_IN and \c ENDPOINT_DESCRIPTOR_DIR_OUT macros have now been replaced by \ref ENDPOINT_DIR_IN and
+ *      \ref ENDPOINT_DIR_OUT to improve code clarity.
+ *    - The \ref HID_DESCRIPTOR_JOYSTICK() macro now takes an additional (first) parameter indicating the number of axis in the joystick.
+ *
+ *  <b>Host Mode</b>
+ *    - The Pipe stream functions now all require a \c BytesProcessed parameter instead of the previous callback parameter.
+ *      This should be set to \c NULL to retain previous behaviour of the functions, or point to a location where the number of bytes
+ *      processed in the current transaction can be stored. If the BytesProcessed parameter is non \c NULL, each time the pipe
+ *      bank becomes full and the packet is sent, the routine will exit with the new \ref PIPE_RWSTREAM_IncompleteTransfer
+ *      error code to allow the user application to determine when to send the next chunk of data.
+ *    - The \ref PRNT_Host_SendString() and \ref CDC_Host_SendString() functions now expect a null terminated string instead of an explicit
+ *      length. Existing code should use the new \ref PRNT_Host_SendData() and \ref CDC_Host_SendData() functions, or remove the
+ *      length parameter from the function call.
+ *    - The \c Pipe_ClearErrorFlags() function has been removed, as the pipe error flags are now automatically cleared when the
+ *      \ref Pipe_ClearError() function is called.
+ *    - The \c Pipe_*_Byte() functions have been renamed Pipe_*_8() to ensure they are correct across all architectures. Existing code using
+ *      these functions should replace the previous function names with the new function names.
+ *    - The \c Pipe_*_Word() functions have been renamed Pipe_*_16() to ensure they are correct across all architectures. Existing code using
+ *      these functions should replace the previous function names with the new function names.
+ *    - The \c Pipe_*_DWord() functions have been renamed Pipe_*_32() to ensure they are correct across all architectures. Existing code using
+ *      these functions should replace the previous function names with the new function names.
+ *    - The \c USB_Host_ClearPipeStall() function has been renamed to USB_Host_ClearEndpointStall(), as it operates on a full endpoint address
+ *      within the attached device and not a pipe within the host. Existing code using the old function name should update the function calls and
+ *      check for correct usage.
+ *
+ *  \section Sec_Migration101122 Migrating from 100807 to 101122
+ *  <b>USB Core</b>
+ *    - A new USB driver source file, \c Drivers/USB/HighLevel/EndpointStream.c now exists. This source file should be added
+ *      to all project makefiles using the USB driver of LUFA, or the makefile should be updated to use the new module source
+ *      variables.
+ *    - A new USB driver source file, \c Drivers/USB/HighLevel/PipeStream.c now exists. This source file should be added to all
+ *      project makefiles using the USB driver of LUFA, or the makefile should be updated to use the new module source variables.
+ *    - The \c EVENT_USB_InitFailure() event has been removed, as the \ref USB_Init() function will no longer fail; if not USB mode is
+ *      specified, the controller will default to UID selection mode.
+ *    - The USB mode specifier constants have been moved into a new enum and renamed. Existing projects should use the equivalent
+ *      value in the new \ref USB_Modes_t enum.
+ *    - All class driver headers are now included as part of the standard \c LUFA/Drivers/USB/USB.h master dispatch header, and should
+ *      no longer be included separately. Class driver module source files must still be added as a separate module in the project's
+ *      makefile if used.
+ *
+ *  <b>Device Mode</b>
+ *    - Endpoints MUST be allocated in ascending order to ensure that bank corruption does not occur. Ensure that your user application
+ *      allocated endpoints in ascending order - or if your application uses the USB device mode class drivers, ensure that each instance's
+ *      endpoint indexes are not overlapped with other interface's endpoints.
+ *    - The signature for the \ref CALLBACK_USB_GetDescriptor() callback has changed, the \c void** \c const \c DescriptorAddress parameter is
+ *      now \c const \c void** \c const \c DescriptorAddress. Existing applications should update their callback signatures to match this, and
+ *      eliminate any casting of descriptor pointers to a non \c const pointer.
+ *    - The names of the class specific descriptor type defines in the USB Class drivers have changed - refer to the driver documentation
+ *      for each class driver for the new class specific descriptor type names.
+ *    - The \c ENDPOINT_DOUBLEBANK_SUPPORTED() macro is has been renamed \c ENDPOINT_BANKS_SUPPORTED() and now returns the total number of
+ *      banks supported by the given endpoint. Existing code should switch to the new naming scheme, and test that the return value of the
+ *      macro is equal to or greater than 2 to regain the previous functionality.
+ *    - The \c EVENT_USB_Device_UnhandledControlRequest() event is now named \ref EVENT_USB_Device_ControlRequest() and fires before (not after)
+ *      the internal library event handlers. Existing code should rename the event handlers in the user application to match the new event
+ *      name, and should ensure that the new execution order does not affect the application's operation.
+ *
+ *  <b>Host Mode</b>
+ *    - Pipes MUST be allocated in ascending order to ensure that bank corruption does not occur. Ensure that your user application
+ *      allocated pipes in ascending order - or if your application uses the USB host mode class drivers, ensure that each instance's
+ *      pipe indexes are not overlapped with other interface's pipes.
+ *    - The \c PRNT_Host_SendData() function has been renamed to \ref PRNT_Host_SendString(). Existing applications should simply
+ *      replace all references to the obsolete function name with the new function name.
+ *    - The names of the class specific descriptor type defines in the USB Class drivers have changed - refer to the driver documentation
+ *      for each class driver for the new class specific descriptor type names.
+ *    - The Still Image Host class' function prefix has been changed from \c SImage_ to  \c SI_, to remain consistent with the rest of the
+ *      driver's enums, type defines and constants.
+ *
+ *  \section Sec_Migration100807 Migrating from 100513 to 100807
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - The Dataflash board driver stub file has changed, as dataflash functions previously located in the internal
+ *      Dataflash driver of the library have now been moved to the individual board files. Existing drivers can
+ *      copy-paste the new functions from the board Dataflash stub driver.
+ *
+ *  <b>USB Core</b>
+ *    - A new USB driver source file, \c Drivers/USB/LowLevel/Device.c now exists. This source file should be added to all project
+ *      makefiles using the USB driver of LUFA, or the makefile should be updated to use the new module source variables.
+ *    - The \c Drivers/USB/LowLevel/DevChapter9.c source file has moved to \c Drivers/USB/HighLevel/DeviceStandardReq.c - this should
+ *      be updated in all project makefiles, or the makefile should be updated to use the new module source variables.
+ *    - The \c Drivers/USB/LowLevel/HostChapter9.h source file has moved to \c Drivers/USB/HighLevel/HostStandardReq.c - this should
+ *      be updated in all project makefiles, or the makefile should be updated to use the new module source variables.
+ *    - The \c Drivers/USB/LowLevel/LowLevel.c source file has moved to \c Drivers/LowLevel/USBController.c - this should be updated
+ *      in all project makefiles, or the makefile should be updated to use the new module source variables.
+ *
+ *  <b>Device Mode</b>
+ *    - The \c USB_Device_IsRemoteWakeupSent() macro has been removed, as the remote wakeup request is now fully handled by the
+ *      enhanced \ref USB_Device_SendRemoteWakeup() function. Existing code may now discard any checks to \c USB_Device_IsRemoteWakeupSent().
+ *    - The \c USB_Device_IsUSBSuspended() macro has been removed, as it is obsolete. Existing code should compare \ref USB_DeviceState
+ *      to see if it the device is in the \ref DEVICE_STATE_Suspended state instead.
+ *    - The \ref CDC_Device_ReceiveByte() function has changed, and now returns a signed 16-bit integer, with -1 indicating no data was
+ *      received. This allows for more efficient coding, as a call to \ref CDC_Device_BytesReceived() is no longer needed if the exact
+ *      number of queued bytes received is not needed.
+ *
+ *  <b>Host Mode</b>
+ *    - The \ref CDC_Host_ReceiveByte() function has changed, and now returns a signed 16-bit integer, with -1 indicating no data was
+ *      received. This allows for more efficient coding, as a call to \ref CDC_Host_BytesReceived() is no longer needed if the exact
+ *      number of queued bytes received is not needed.
+ *    - The \ref CDC_Host_USBTask() now calls \ref CDC_Host_Flush() automatically, flushing any queued data to the attached device. Manual
+ *      flushing of the interface is no longer needed if the flushes should be in sync with calls to \ref CDC_Host_USBTask().
+ *
+ *  \section Sec_Migration100513 Migrating from 100219 to 100513
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - The \ref TWI_StartTransmission() function now takes in a timeout period, expressed in milliseconds, within which the addressed
+ *      device must respond or the function will abort.
+ *
+ *  <b>Device Mode</b>
+ *    - The \ref USB_Init() function no longer calls \c sei() to enable global interrupts, as the user application may need
+ *      to perform other initialization before it is ready to handle global interrupts. The user application is now responsible
+ *      for enabling global interrupts before or shortly after calling \ref USB_Init() to ensure that the enumeration process
+ *      functions correctly.
+ *    - The \c USBInterrupt.c USB driver source file has been relocated from \c LUFA/Drivers/USB/HighLevel/ to \c LUFA/Drivers/USB/LowLevel.
+ *      Projects must update their makefile SRC values accordingly.
+ *    - The HID Device Class driver's function signature for the \ref CALLBACK_HID_Device_ProcessHIDReport() function has been changed, to
+ *      allow for a new \c ReportType parameter. This new parameter must be added in all user applications using the Device mode HID Class
+ *      Driver, but may be ignored unless Host-to-Device FEATURE HID reports are used.
+ *
+ *  <b>Host Mode</b>
+ *    - The \ref USB_Init() function no longer calls \c sei() to enable global interrupts, as the user application may need
+ *      to perform other initialization before it is ready to handle global interrupts. The user application is now responsible
+ *      for enabling global interrupts before or shortly after calling \ref USB_Init() to ensure that the enumeration process
+ *      functions correctly.
+ *    - The \c USBInterrupt.c USB driver source file has been relocated from \c LUFA/Drivers/USB/HighLevel/ to \c LUFA/Drivers/USB/LowLevel.
+ *      Projects must update their makefile \c SRC values accordingly.
+ *    - The HID Host Class driver's function signature for the \ref HID_Host_SendReportByID() function has been changed, to allow for a new
+ *      ReportType parameter. Existing calls to this function should substitute \c REPORT_ITEM_TYPE_Out as this parameter's value.
+ *
+ *  \section Sec_Migration100219 Migrating from 091223 to 100219
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - Due to some ADC channels not being identical to their ADC MUX selection masks for single-ended conversions on some AVR models,
+ *      the ADC driver now has explicit masks for each of the standard ADC channels (see \ref Group_ADC). These masks should be used
+ *      when calling the ADC functions to ensure proper operation across all AVR models. Note that the \ref ADC_SetupChannel() function
+ *      is an exception, and should always be called with a channel number rather than a channel mask.
+ *
+ *  <b>Host Mode</b>
+ *    - The MIDI Host Class driver send and receive routines now operate on packed events, where multiple MIDI events may be
+ *      packed into a single USB packet. This means that the sending of MIDI events will now be delayed until the MIDI send
+ *      pipe bank is full. To override this new behaviour and revert to the previous behaviour, the user application may manually
+ *      flush the queued event(s) to the device by calling \ref MIDI_Host_Flush().
+ *    - The \ref Pipe_IsEndpointBound() function now takes the endpoint's direction into account, by checking if the MSB of the endpoint's address
+ *      is set to denote IN endpoints. If the previous functionality where the direction is to be discounted is required, mask the endpoint
+ *      address against the \ref PIPE_EPNUM_MASK token before calling \ref Pipe_IsEndpointBound().
+ *
+ *  <b>Device Mode</b>
+ *    - The MIDI Device Class driver send and receive routines now operate on packed events, where multiple MIDI events may be
+ *      packed into a single USB packet. This means that the sending of MIDI events will now be delayed until the MIDI send
+ *      endpoint bank is full. To override this new behaviour and revert to the previous behaviour, the user application may manually
+ *      flush the queued event(s) to the host by calling \ref MIDI_Device_Flush().
+ *
+ *  \section Sec_Migration091223 Migrating from 091122 to 091223
+ *
+ *  <b>Host Mode</b>
+ *    - The Still Image Host Class driver \ref SI_Host_USBTask() and \ref SI_Host_ConfigurePipes() functions were misnamed, and are
+ *      now named \c SImage_Host_USBTask() and \c SImage_Host_ConfigurePipes() respectively.
+ *    - The \c HOST_SENDCONTROL_DeviceDisconnect enum value has been renamed to \ref HOST_SENDCONTROL_DeviceDisconnected to be in
+ *      line with the rest of the library error codes.
+ *    - The HID Parser item usages no longer contain separate minimum and maximum values, as this was a violation of the HID
+ *      specification. Instead, the values are distributed evenly across each item as its usage value, to ensure that all items
+ *      can be distinguished from one-another.
+ *
+ *  <b>Device Mode</b>
+ *    - The \ref CALLBACK_HID_Device_CreateHIDReport() HID Device Class driver callback now has a new \c ReportType parameter to
+ *      indicate the report type to generate. Existing applications may simply add and ignore this additional parameter.
+ *
+ *  \section Sec_Migration091122 Migrating from 090924 to 091122
+ *
+ *  <b>Host Mode</b>
+ *    - The \c HID_PARSE_UsageStackOverflow HID parser error constant is now named \ref HID_PARSE_UsageListOverflow
+ *    - The \ref CALLBACK_HIDParser_FilterHIDReportItem() HID Parser callback now passes a complete \ref HID_ReportItem_t to the
+ *      user application, instead of just its attributes.
+ *    - The \c USB_GetDeviceConfigDescriptor() function was incorrectly named and is now called \ref USB_Host_GetDeviceConfigDescriptor().
+ *
+ *  \section Sec_Migration090924 Migrating from 090810 to 090924
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - The \c ADC_Off() function has been renamed to \c ADC_ShutDown() to be consistent with the rest of the library.
+ *    - The \ref SPI_Init() routine's parameters have changed, so that the clock polarity and data sampling modes can be set. See
+ *      the \ref SPI_Init() function documentation for more details
+ *    - The \ref Dataflash_Init() routine no longer initializes the SPI bus - the SPI bus should be initialized manually via a
+ *      call to \ref SPI_Init() before using the Dataflash driver
+ *
+ *  <b>Host Mode</b>
+ *    - The \c USB_GetDeviceConfigDescriptor() function's parameters and behaviour has changed; the user is required to
+ *      preallocate the largest allowable buffer, and pass the size of the buffer to the function. This allows for a single
+ *      call to the function to retrieve, size check and validate the Configuration Descriptor rather than having the user
+ *      application perform these intermediary steps.
+ *    - The HID report parser now requires a mandatory callback in the user code, to filter only the items the application
+ *      is interested in into the processed HID report item structure to save RAM. See \ref CALLBACK_HIDParser_FilterHIDReportItem().
+ *    - The HID report parser now always parses FEATURE and always ignores constant-data items - the \c HID_ENABLE_FEATURE_PROCESSING
+ *      and \c HID_INCLUDE_CONSTANT_DATA_ITEMS compile time tokens now have no effect.
+ *    - The \c USE_NONSTANDARD_DESCRIPTOR_NAMES compile time token has been removed - there are now separate \c USB_Descriptor_*
+ *      and \c USB_StdDescriptor_* structures for both the LUFA and standardized element naming conventions so that both may be used in
+ *      the one project. For existing projects using the standardized names, change all code to use the \c USB_StdDescriptor_* variants.
+ *
+ *  <b>Device Mode</b>
+ *    - The \c USE_NONSTANDARD_DESCRIPTOR_NAMES compile time token has been removed - there are now separate \c USB_Descriptor_*
+ *      and \c USB_StdDescriptor_* structures for both the LUFA and standardized element naming conventions so that both may be used in
+ *      the one project. For existing projects using the standardized names, change all code to use the \c USB_StdDescriptor_* variants.
+ *
+ *  \section Sec_Migration090810 Migrating from 090605 to 090810
+ *
+ *  <b>All</b>
+ *    - The "Simple Scheduler" has been <i>deprecated</i>, as it was little more than an abstracted loop and caused much confusion.
+ *      User applications using the scheduler should switch to regular loops instead. The scheduler code will be removed in a future
+ *      release.
+ *    - The "Dynamic Memory Block Allocator" has been removed, as it was unused in (and unrelated to) the LUFA library and never
+ *      used in user applications.
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - The \c ATTR_NOINLINE function attribute macro has been renamed to \ref ATTR_NO_INLINE to be in line with the rest of the function attribute
+ *      macro names.
+ *
+ *  <b>Library Demos</b>
+ *    - Most demos now have a corresponding Class Driver implementation, which uses the new internal library class drivers for the standard
+ *      USB classes. This allows for more rapid device and host development, and so should be used in preference to the low level APIs where
+ *      possible so that fixes to the class drivers propagate to all applications which use them automatically with each new LUFA release.
+ *
+ *  <b>Host Mode</b>
+ *    - The \c HIDParser.c module has moved from \c LUFA/Drivers/USB/Class/ to \c LUFA/Drivers/USB/Class/Host/.
+ *    - The \c USB_GetDeviceConfigDescriptor() function now requires the desired configuration index within the device as its first
+ *      parameter, to add support for multi-configuration devices. Existing code should use a configuration index of 1 to indicate the
+ *      first configuration descriptor within the device.
+ *    - The non-standard "Ready" host state has been removed. Existing \ref HOST_STATE_Configured code should be moved to the end of
+ *      the existing \ref HOST_STATE_Addressed state, and the existing HOST_STATE_Ready state code should be moved to the \ref HOST_STATE_Configured
+ *      state.
+ *    - The \c USB_IsConnected global has been removed, as it is too vague for general use. Test \ref USB_HostState explicitly to ensure the host is
+ *      in the desired state instead.
+ *    - The USB event names have been changed and their firing conditions changed to properly separate out Host mode events from Device mode
+ *      events. See the \ref Group_Events page for details on the new event names and firing conditions.
+ *
+ *  <b>Device Mode</b>
+ *    - The \ref CALLBACK_USB_GetDescriptor() function now takes an extra parameter to specify the descriptor's memory space so that
+ *      descriptors in mixed memory spaces can be used. The previous functionality can be returned by defining the \c USE_FLASH_DESCRIPTORS
+ *      token in the project makefile to fix all descriptors into FLASH space and remove the extra function parameter.
+ *    - The \c USB_IsSuspended global has been removed - test \ref USB_DeviceState against \ref DEVICE_STATE_Suspended instead.
+ *    - The \c USB_IsConnected global has been removed, as it is too vague for general use. Test \ref USB_DeviceState explicitly to ensure the device
+ *      is in the desired state instead.
+ *    - The VBUS events have been removed, as they are already exposed to the user via the \c USB_Connect and \c USB_Disconnect events.
+ *    - The USB event names have been changed and their firing conditions changed to properly separate out Host mode events from Device mode
+ *      events. See the \ref Group_Events page for details on the new event names and firing conditions.
+ *
+ *  \section Sec_Migration090605 Migrating from 090510 to 090605
+ *
+ *  <b>Device Mode</b>
+ *    - Support for non-control data endpoint interrupts has been dropped due to many issues in the implementation. All existing
+ *      projects using interrupts on non-control endpoints should switch to polling. For control interrupts, the library can
+ *      manage the control endpoint via interrupts automatically by compiling with the \c INTERRUPT_CONTROL_ENDPOINT token defined.
+ *    - The \c DESCRIPTOR_ADDRESS() macro has been removed. User applications should use normal casts to obtain a descriptor's memory
+ *      address.
+ *    - The library events system has been rewritten, so that all macros have been removed to allow for clearer user code. See
+ *      \ref Group_Events for new API details.
+ *    - The \c STREAM_CALLBACK() macro has been removed. User applications should replace all instances of the macro with regular
+ *      function signatures of a function accepting no arguments and returning a \c uint8_t value.
+ *    - The \c Event_DeviceError() event no longer exists, as its sole caller (unlinked \c USB_GetDescriptor() function) now produces a
+ *      compilation error rather than a runtime error. The \c StdDescriptors.c file no longer exists as a result, and should be removed
+ *      from project makefiles.
+ *    - The \c USB_GetDescriptor() function has been renamed to \ref CALLBACK_USB_GetDescriptor() to be in line with the new \c CALLBACK_
+ *      function prefixes for functions which <i>must</i> be implemented in the user application.
+ *
+ *  <b>Host Mode</b>
+ *    - Support for non-control data pipe interrupts has been dropped due to many issues in the implementation. All existing
+ *      projects using interrupts on non-control pipes should switch to polling.
+ *    - The library events system has been rewritten, so that all macros have been removed to allow for clearer user code. See
+ *      \ref Group_Events for new API details.
+ *    - The \c STREAM_CALLBACK() macro has been removed. User applications should replace all instances of the macro with regular
+ *      function signatures of a function accepting no arguments and returning a \c uint8_t value.
+ *    - The \c DESCRIPTOR_COMPARATOR() macro has been removed. User applications should replace all instances of the macro with
+ *      regular function signatures of a function accepting a void pointer to the descriptor to test, and returning a \c uint8_t value.
+ *
+ *  \section Sec_Migration090510 Migrating from 090401 to 090510
+ *
+ *  <b>All</b>
+ *    - The \c ButtLoadTag.h header has been removed, as it was never used for its intended purpose. Projects should either remove all
+ *      \c BUTTLOADTAG() elements, or download and extract \c ButtLoadTag.h header from the ButtLoad project.
+ *    - The \c Drivers/AT90USBXXX/ directory has been renamed to \c Drivers/Peripheral/.
+ *    - The \c Serial_Stream driver has been renamed to \c SerialStream to remain consistent with the rest of the library naming scheme.
+ *    - The HWB driver has changed to the \c Buttons driver. See the board Buttons driver documentation for the new API.
+ *
+ *  <b>Dual Role Mode</b>
+ *    - The \c USB_PowerOnFail event has been renamed to \c USB_InitFailure.
+ *    - The functions in \c OTG.h have been renamed to remain more consistent with the library API. See the functions in \c OTG.h for more
+ *      details.
+ *
+ *  <b>Device Mode</b>
+ *    - The \c Endpoint_ClearCurrentBank() macro has been removed, and is now replaced with the \ref Endpoint_ClearIN(), \ref Endpoint_ClearOUT()
+ *      macros. See \c Endpoint.h documentation for more details on the new endpoint management macros.
+ *    - The \c Endpoint_ReadWriteAllowed() macro has been renamed to \ref Endpoint_IsReadWriteAllowed() to be more consistent with the rest of
+ *      the API naming scheme.
+ *    - The \c Endpoint_IsSetupINReady() and \c Endpoint_IsSetupOUTReceived() macros have been renamed to \ref Endpoint_IsINReady() and
+ *      \ref Endpoint_IsOUTReceived() respectively.
+ *    - The \c Endpoint_IsSetupReceived() macro has been renamed to \ref Endpoint_IsSETUPReceived().
+ *    - The \c Endpoint_ClearSetupReceived() macro has been renamed to \ref Endpoint_ClearSETUP().
+ *    - All endpoint read/write/discard aliases which did not have an explicitly endianness specifier (such as \c Endpoint_Read_Word()) have
+ *      been removed for clarity. Existing projects should use the \c _LE suffix on such calls to use the explicit Little Endian versions.
+ *    - The \c USB_UnhandledControlPacket event no longer has any parameters. User code should no longer attempt to read in the remainder of
+ *      the Control Request header as all Control Request header data is now preloaded by the library and made available in the
+ *      USB_ControlRequest structure.
+ *    - The \c FEATURELESS_CONTROL_ONLY_DEVICE token has been renamed to \c CONTROL_ONLY_DEVICE.
+ *    - The \c STATIC_ENDPOINT_CONFIGURATION is no longer applicable as the library will apply this optimization when appropriate automatically.
+ *    - The values of the \ref Endpoint_Stream_RW_ErrorCodes_t and \ref Endpoint_ControlStream_RW_ErrorCodes_t enums have had the \c ERROR_ portion
+ *      of their names removed.
+ *
+ *  <b>Host Mode</b>
+ *    - The \ref USB_Host_SendControlRequest() function no longer automatically selects the Control pipe (pipe 0) to allow it to be used on
+ *      other control type pipes. Care should be taken to ensure that the Control pipe is always selected before the function is called
+ *      in existing projects where the Control pipe is to be operated on.
+ *    - The USB Host management task now saves and restores the currently selected pipe before and after the task runs. Projects no longer
+ *      need to manage this manually when calling the USB management task.
+ *    - The \c Pipe_ClearCurrentBank() macro has been removed, and is now replaced with the Pipe_ClearIN(), Pipe_ClearOUT() macros. See
+ *      Pipe.h documentation for more details on the new pipe management macros.
+ *    - The \c Pipe_ReadWriteAllowed() macro has been renamed to \ref Pipe_IsReadWriteAllowed() to be more consistent with the rest of the API
+ *      naming scheme.
+ *    - The \c Pipe_IsSetupINReceived() and \c Pipe_IsOutReady() macros have been renamed to \ref Pipe_IsINReceived() and \ref Pipe_IsOUTReady()
+ *      respectively.
+ *    - The new \ref Pipe_ClearSETUP() macro should be used to send SETUP transactions, rather than the previous \c Pipe_ClearSetupOUT() macro.
+ *    - The \c Pipe_IsSetupSent() macro has been renamed to \ref Pipe_IsSETUPSent().
+ *    - The \c Pipe_ClearSetupSent() macro is no longer applicable and should be removed.
+ *    - All pipe read/write/discard aliases which did not have an explicitly endianness specifier (such as \c Pipe_Read_Word()) have
+ *      been removed for clarity. Existing projects should use the \c _LE suffix on such calls to use the explicit Little Endian versions.
+ *    - The \c Host_IsResetBusDone() macro has been renamed to \c Host_IsBusResetComplete().
+ *    - The \c Pipe_Ignore_Word() and \c Pipe_Ignore_DWord() functions have been renamed to \c Pipe_Discard_Word() and \c Pipe_Discard_DWord()
+ *      to remain consistent with the rest of the pipe API.
+ *    - It is no longer needed to manually include the headers from \c LUFA/Drivers/USB/Class, as they are now included along with the rest
+ *      of the USB headers when \c LUFA/Drivers/USB/USB.h is included.
+ *    - Functions in the \c ConfigDescriptor.h header file no longer have \c Host_ as part of their names.
+ *    - The \c ProcessHIDReport() has been renamed to \ref USB_ProcessHIDReport(), \c GetReportItemInfo() has been renamed to \ref USB_GetHIDReportItemInfo()
+ *      and \c SetReportItemInfo() has been renamed to \ref USB_GetHIDReportItemInfo().
+ *    - The values of the \ref DSearch_Return_ErrorCodes_t and \ref DSearch_Comp_Return_ErrorCodes_t enums have had their respective \c Descriptor_Search
+ *      and \c Descriptor_Search_Comp prefixes changed to all caps.
+ *    - The \c USB_HostRequest global has been renamed to \ref USB_ControlRequest, and is used in Device mode also. The \c USB_Host_Request_Header_t
+ *      structure type has been renamed to \ref USB_Request_Header_t.
+ *    - The values of the \ref Pipe_Stream_RW_ErrorCodes_t enum have had the \c ERROR_ portion of their names removed.
+ *
+ *  \section Sec_Migration090401 Migrating from 090209 to 090401
+ *
+ *  <b>All</b>
+ *    - LUFA projects must now give the raw input clock frequency (before any prescaling) as a compile time constant \c F_USB,
+ *      defined in the project makefile and passed to the compiler via the -D switch.
+ *    - The makefile EEPROM programming targets for FLIP and dfu-programmer no longer program in the FLASH data in addition to the
+ *      EEPROM data into the device. If both are to be programmed, both the EEPROM and FLASH programming targets must be called.
+ *    - As the avr-libc macro has been corrected in recent avr-libc distributions, the \c SetSystemClockPrescaler() macro has been removed.
+ *      Include \c <avr/power.h> and call \c clock_prescale_set(clock_div_1); instead on recent avr-libc distributions.
+ *
+ *  <b>Library Demos</b>
+ *    - The USBtoSerial demo now discards all data when not connected to a host, rather than buffering it for later transmission.
+ *
+ *  <b>Non-USB Library Components</b>
+ *    - The \c ATTR_ALWAYSINLINE function attribute macro has been renamed to \ref ATTR_ALWAYS_INLINE.
+ *    - Custom board Dataflash drivers now require the implementation of \ref D