/** \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_MigrationXXXXXX Migrating from 090810 to XXXXXX * * Non-USB Library Components * - The ADC_Off() function has been renamed to \ref ADC_ShutDown() to be consistent with the rest of the library. * - The Dataflash_Init() routine no longer initializes the SPI bus - the SPI bus should be initialized manually via a * call to SPI_Init() before using the Dataflash driver * - The SPI_Init() routine's parameters have changed, so that the clock polarity and data sampling modes can be set. See * the SPI_Init() function documentation for more details * * Host Mode * - The \ref 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 intermediatary 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 HID_ENABLE_FEATURE_PROCESSING * and HID_INCLUDE_CONSTANT_DATA_ITEMS compile time tokens now have no effect. * * \section Sec_Migration090810 Migrating from 090605 to 090810 * * All * - The "Simple Scheduler" has been deprecated, as it was little more than an abtracted 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. The library is available from the author's website for those wishing to still use it in their * applications. * * Non-USB Library Components * - The ATTR_NOINLINE function attribute macro has been renamed to ATTR_NO_INLINE to be in line with the rest of the function attribute * macro names. * * Library Demos * - 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. * * Host Mode * - The HIDParser.c module has moved from LUFA/Drivers/USB/Class/ to LUFA/Drivers/USB/Class/Host/. * - The \ref 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 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 seperate out Host mode events from Device mode * events. See the \ref Group_Events page for details on the new event names and firing conditions. * * Device Mode * - 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 USE_FLASH_DESCRIPTORS * token in the project makefile to fix all descriptors into FLASH space and remove the extra function parameter. * - The USB_IsSuspended global has been removed - test \ref USB_DeviceState against \ref DEVICE_STATE_Suspended instead. * - The 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 USB_Connect and USB_Disconnect events. * - The USB event names have been changed and their firing conditions changed to properly seperate 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 * * Device Mode * - 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 INTERRUPT_CONTROL_ENDPOINT token defined. * - The 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 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 uint8_t value. * - The Event_DeviceError() event no longer exists, as its sole caller (unlinked USB_GetDescriptor() function) now produces a * compilation error rather than a runtime error. The StdDescriptors.c file no longer exists as a result, and should be removed * from project makefiles. * - The USB_GetDescriptor() function has been renamed to CALLBACK_USB_GetDescriptor() to be in line with the new CALLBACK_ function * prefixes for functions which *must* be implemented in the user application. * * Host Mode * - 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 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 uint8_t value. * - The 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 uint8_t value. * * * \section Sec_Migration090510 Migrating from 090401 to 090510 * * All * - The ButtLoadTag.h header has been removed, as it was never used for its intended purpose. Projects should either remove all * BUTTLOADTAG elements, or download and extract ButtLoadTag.h header from the ButtLoad project. * - The Drivers/AT90USBXXX directory has been renamed to Drivers/Peripheral. * - The Serial_Stream driver has been renamed to SerialStream to remain consistent with the rest of the library naming scheme. * - The HWB driver has changed to the Buttons driver. See the board Buttons driver documentation for the new API. * * Dual Role Mode * - The USB_PowerOnFail even has been renamed to USB_InitFailure. * - The functions in OTG.h have been renamed to remain more consistent with the library API. See the functions in OTG.h for more * details. * * Library Demos * - Most demos, bootloaders and applications have had significant changes from previous versions. Applications built off of any * library demos should update to the latest versions. * * Device Mode * - The Endpoint_ClearCurrentBank() macro has been removed, and is now replaced with the Endpoint_ClearIN(), Endpoint_ClearOUT() * macros. See Endpoint.h documentation for more details on the new endpoint management macros. * - The Endpoint_ReadWriteAllowed() macro has been renamed to Endpoint_IsReadWriteAllowed() to be more consistent with the rest of * the API naming scheme. * - The Endpoint_IsSetupINReady() and Endpoint_IsSetupOutReceived() macros have been renamed to Endpoint_IsINReady() and * Endpoint_IsOUTReceived() respectively. * - The Endpoint_IsSetupReceived() macro has been renamed to Endpoint_IsSETUPReceived(). * - The Endpoint_ClearSetupReceived() macro has been renamed to Endpoint_ClearSETUP(). * - All endpoint read/write/discard aliases which did not have an explicitly endianness specifier (such as Endpoint_Read_Word()) have * been removed for clarity. Existing projects should use the "_LE" suffix on such calls to use the explicit Little Endian versions. * - The 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 FEATURELESS_CONTROL_ONLY_DEVICE token has been renamed to CONTROL_ONLY_DEVICE. * - The STATIC_ENDPOINT_CONFIGURATION is no longer applicable as the library will apply this optimization when appropriate automatically. * - The values of the Endpoint_Stream_RW_ErrorCodes_t and Endpoint_ControlStream_RW_ErrorCodes_t enums have had the "ERROR_" portion * of their names removed. * * Host Mode * - The 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 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 Pipe_ReadWriteAllowed() macro has been renamed to Pipe_IsReadWriteAllowed() to be more consistent with the rest of the API * naming scheme. * - The Pipe_IsSetupINReceived() and Pipe_IsOutReady() macros have been renamed to Pipe_IsINReceived() and Pipe_IsOUTReady() * respectively. * - The new Pipe_ClearSETUP() macro should be used to send SETUP transactions, rather than the previous Pipe_ClearSetupOUT() macro. * - The Pipe_IsSetupSent() macro has been renamed to Pipe_IsSETUPSent(). * - The 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 Pipe_Read_Word()) have * been removed for clarity. Existing projects should use the "_LE" suffix on such calls to use the explicit Little Endian versions. * - The Host_IsResetBusDone() macro has been renamed to Host_IsBusResetComplete(). * - The Pipe_Ignore_Word() and Pipe_Ignore_DWord() functions have been renamed to Pipe_Discard_Word() and Pipe_Discard_DWord() to remain * consistent with the rest of the pipe API. * - It is no longer needed to manually include the headers from LUFA/Drivers/USB/Class, as they are now included along with the rest * of the USB headers when LUFA/Drivers/USB/USB.h is included. * - Functions in the ConfigDescriptor.h header file no longer have "Host_" as part of their names. * - The ProcessHIDReport() has been renamed to USB_ProcessHIDReport(), GetReportItemInfo() has been renamed to USB_GetHIDReportItemInfo() * and SetReportItemInfo() has been renamed to USB_GetHIDReportItemInfo(). * - The values of the DSearch_Return_ErrorCodes_t and DSearch_Comp_Return_ErrorCodes_t enums have had their respective "Descriptor_Search" * and "Descriptor_Search_Comp" prefixes changed to all caps. * - The USB_HostRequest global has been renamed to USB_ControlRequest, and is used in Device mode also. The USB_Host_Request_Header_t * structure type has been renamed to USB_Request_Header_t. * - The values of the Pipe_Stream_RW_ErrorCodes_t enum have had the "ERROR_" portion of their names removed. * * * \section Sec_Migration090401 Migrating from 090209 to 090401 * * All * - LUFA projects must now give the raw input clock frequency (before any prescaling) as a compile time constant "F_CLOCK", * 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 SetSystemClockPrescaler() macro has been removed. * Include and call clock_prescale_set(clock_div_1); instead on recent avr-libc distributions. * * Library Demos * - The USBtoSerial demo now discards all data when not connected to a host, rather than buffering it for later transmission. * - Most demos, bootloaders and applications have had their control request handling code corrected, to properly send the status * stage in all handled requests. If you are using code based off one of the library demos, bootloaders or applications, you should * update to the latest revisions. * * Non-USB Library Components * - The ATTR_ALWAYSINLINE function attribute macro has been renamed to ATTR_ALWAYS_INLINE. * - Custom board Dataflash drivers now require the implementation of Dataflash_SelectChipFromPage() and Dataflash_SendAddressBytes(). * * Device Mode * - 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. On all applications currently using the * NO_CLEARSET_FEATURE_REQUEST compile time token, it can be replaced with the FEATURELESS_CONTROL_ONLY_DEVICE token with no further * modifications required. * * * \section Sec_Migration090209 Migrating from 081217 to 090209 * * Device Mode * - The ENDPOINT_MAX_ENDPOINTS constant has been renamed to the more appropriate name of ENDPOINT_TOTAL_ENDPOINTS. * - The USB_STREAM_TIMEOUT_MS stream timeout default period has been extended to 100ms. This can be overridden in the user * makefile if desired to restore the previous 50ms timeout. * * Host Mode * - The PIPE_MAX_ENDPOINTS constant has been renamed to the more appropriate name of PIPE_TOTAL_ENDPOINTS. * - The USB_STREAM_TIMEOUT_MS stream timeout default period has been extended to 100ms. This can be overridden in the user * makefile if desired to restore the previous 50ms timeout. * - The USB_DeviceEnumerationFailed event now contains a second "SubErrorCode" parameter, giving the error code of the function * which failed. * - The HID_PARSE_Sucessful enum member constant has been corrected to HID_PARSE_Successful. * * Non-USB Library Components * - The previous SPI_SendByte() functionality is now located in SPI_TransferByte(). SPI_SendByte() now discards the return byte * for speed, to compliment the new SPI_ReceiveByte() function. If two-way SPI transfers are required, calls to SPI_SendByte() * should be changed to SPI_TransferByte(). * - The serial driver now sets the Tx line as an output explicitly, and enables the pullup of the Rx line. * - The Serial_Init() and SerialStream_Init() functions now take a second DoubleSpeed parameter, which indicates if the USART * should be initialized in double speed mode - useful in some circumstances for attaining baud rates not usually possible at * the given AVR clock speed. * * Library Demos * - Most library demos have been enhanced and/or had errors corrected. All users of all demos should upgrade their codebase to * the latest demo versions. * * * \section Sec_Migration171208 Migrating from V1.5.3 to 081217 * * All * - The MyUSB project name has been changed to LUFA (Lightweight Framework for USB AVRs). All references to MyUSB, including macro names, * have been changed to LUFA. * * Library Demos * - The ReconfigureUSART() routine in the USBtoSerial demo was not being called after new line encoding * parameters were set by the host. Projects built on the USBtoSerial code should update to the latest version. * - The HID Parser now supports multiple report (on a single endpoint) HID devices. The MouseHostWithParser and * KeyboardHostWithPaser demos use the updated API functions to function correctly on such devices. Projects * built on either "WithParser" demo should update to the latest code. * - The RNDIS demo TCP stack has been modified so that connections can be properly closed. It is still not * recommended that the MyUSB RNDIS demo TCP/IP stack be used for anything other than demonstration purposes, * as it is neither a full nor a standards compliant implementation. * * Non-USB Library Components * - The Serial_IsCharReceived() macro has been changed to the correct spelling of Serial_IsCharReceived() in Serial.h. * * Device Mode * - The MANUAL_PLL_CONTROL compile time token has been removed, and replaced with a USB_OPT_MANUAL_PLL mask * to be used in the Options parameter of the USB_Init() function. * - Calling USB_Init() now forces a complete USB interface reset and enumeration, even if the USB interface is * currently initialized. * - Interrupts are now disabled when processing control requests, to avoid problems with interrupts causing the library * or user request processing code to exceed the strict USB timing requirements on control transfers. * - The USB Reset event now resets and disables all device endpoints. If user code depends on endpoints remaining configured * after a Reset event, it should be altered to explicitly re-initialize all user endpoints. * - The prototype for the GetDescriptor function has been changed, as the return value was redundant. The function now * returns the size of the descriptor, rather than passing it back via a parameter, or returns NO_DESCRIPTOR if the specified * descriptor does not exist. * - The NO_DESCRIPTOR_STRING macro has been renamed NO_DESCRIPTOR, and is now also used as a possible return value for the * GetDescriptor function. * * Host Mode * - The MANUAL_PLL_CONTROL compile time token has been removed, and replaced with a USB_OPT_MANUAL_PLL mask * to be used in the Options parameter of the USB_Init() function. * - The HID report parser now supports multiple Report IDs. The HID report parser GetReportItemInfo() and * SetReportItemInfo() routines now return a boolean, set if the requested report item was located in the * current report. If sending a report to a multi-report device, the first byte of the report is automatically * set to the report ID of the given report item. * - Calling USB_Init() now forces a complete USB interface reset and enumeration, even if the USB interface is * currently initialized. * * * \section Sec_Migration152 Migrating from V1.5.2 to V1.5.3 * * Library Demos * - Previously, all demos contained a serial number string descriptor, filled with all zeros. A serial number * string is required in Mass Storage devices, or devices which are to retain settings when moved between * ports on a machine. As people were not changing the serial number value, this was causing conflicts and so * the serial number descriptor has been removed from all but the Mass Storage demo, which requires it. * - The AudioOut and AudioIn demos did not previously silence their endpoints when the host has deactivated * them. Projects built upon either demo should upgrade to the latest code. * - The FEATURE_ENDPOINT macro has been renamed FEATURE_ENDPOINT_HALT, and is now correctly documented. * - The MassStoreHost demo contained errors which caused it to lock up randomly on certain devices. Projects built * on the MassStoreDemo code should update to the latest version. * - The Interrupt type endpoint in the CDC based demos previously had a polling interval of 0x02, which caused * problems on some Linux systems. This has been changed to 0xFF, projects built on the CDC demos should upgrade * to the latest code. * - The HID keyboard and mouse demos were not previously boot mode compatible. To enable boot mode support, projects * built on the keyboard or mouse demos (or derivatives) should upgrade to the latest code. * - The Mass Storage demo was not previously standards compliant. Projects built on the Mass Storage demo should * upgrade to the latest code. * - The USART was not being reconfigured after the host sent new encoding settings in the USBtoSerial demo. This was * previously discovered and fixed, but the change was lost. Projects built on the USBtoSerial demo should update * to the latest code. * * Device Mode * - The endpoint non-control stream functions now have a default timeout of 50ms between packets in the stream. * If this timeout is exceeded, the function returns the new ENDPOINT_RWSTREAM_ERROR_Timeout error value. The * timeout value can be overridden by defining the USB_STREAM_TIMEOUT_MS in the project makefile to the desired * timeout duration in ms. * - Rather than returning fixed values, the flags indicating if the device has Remote Wakeup currently enabled * and/or is self-powered are now accessed and set through the new USB_RemoteWakeupEnabled and * USB_CurrentlySelfPowered macros. See the DevChapter9.h documentation for more details. * - All endpoint stream functions now require an extra Callback function parameter. Existing code may be updated * to either supply NO_STREAM_CALLBACK as the extra parameter, or disable stream callbacks altogether by passing * the token NO_STREAM_CALLBACKS to the compiler using the -D switch. * * Host Mode * - The pipe non-control stream functions now have a default timeout of 50ms between packets in the stream. * If this timeout is exceeded, the function returns the new PIPE_RWSTREAM_ERROR_Timeout error value. The * timeout value can be overridden by defining the USB_STREAM_TIMEOUT_MS in the project makefile to the desired * timeout duration in ms. * - CollectionPath_t has been renamed to HID_CollectionPath_t to be more in line with the other HID parser structures. * - All pipe stream functions now require an extra Callback function parameter. Existing code may be updated * to either supply NO_STREAM_CALLBACK as the extra parameter, or disable stream callbacks altogether by passing * the token NO_STREAM_CALLBACKS to the compiler using the -D switch. * * * \section Sec_Migration151 Migrating from V1.5.1 to V1.5.2 * * Library Demos * - The RNDIS demo application has been updated so that it is functional on Linux under earlier implementations * of the RNDIS specification, which had non-standard behaviour. Projects built upon the demo should upgrade * to the latest code. * - The DFU class bootloader has had several bugs corrected in this release. It is recommended that where * possible any existing devices upgrade to the latest bootloader code. * * * \section Sec_Migration150 Migrating from V1.5.0 to V1.5.1 * * Library Demos * - The USBtoSerial demo was broken in the 1.5.0 release, due to incorrect register polling in place of the * global "Transmitting" flag. The change has been reverted in this release. Projects built upon the demo * should upgrade to the latest code. * - The HID class demos did not implement the mandatory GetReport HID class request. Projects built upon the HID * demos should upgrade to the latest code. * - The HID class demos incorrectly reported themselves as boot-protocol enabled HID devices in their descriptors. * Projects built upon the HID demos should upgrade to the latest code. * - The MIDI device demo had incorrect AudioStreaming interface descriptors. Projects built upon the MIDI demo * should upgrade to the latest code. * - The AudioOut demo did not correctly tristate the speaker pins when USB was disconnected, wasting power. * Projects built upon the AudioOut demo should upgrade to the latest code. * * * \section Sec_Migration141 Migrating from V1.4.1 to V1.5.0 * * Library Demos * - Previous versions of the library demos had incorrectly encoded BCD version numbers in the descriptors. To * avoid such mistakes in the future, the VERSION_BCD macro has been added to StdDescriptors.h. Existing * projects should at least manually correct the BCD version numbers, or preferably update the descriptors to * encode the version number in BCD format using the new macro. * - The mandatory GetReport class-specific request was accidentally omitted from previous versions of the demos * based on the Human Interface Device (HID) class. This has been corrected, and any user projects based on the * HID demos should also be updated accordingly. * - The CDC demos now correctly send an empty packet directly after a full packet, to end the transmission. * Failure to do this on projects which always or frequently send full packets will cause buffering issues on * the host OS. All CDC user projects are advised to update their transmission routines in the same manner as * the library CDC demos. * - The previous interrupt-driven Endpoint/Pipe demos did not properly save and restore the currently selected * Endpoint/Pipe when the ISR fired. This has been corrected - user projects based on the interrupt driven * demos should also update to properly save and restore the selected Endpoint/Pipe. * * Non-USB Library Components * - The Atomic.h and ISRMacro.h header files in MyUSB/Common have been removed, as the library is now only * compatible with avr-libc library versions newer than the time before the functionality of the deleted * headers was available. * * Device Mode * - The GetDescriptor function (see StdDescriptors.h) now has a new prototype, with altered parameter names and * functions. Existing projects will need to update the GetDescriptor implementation to reflect the new API. * The previously split Type and Index parameters are now passed as the original wValue parameter to the * function, to make way for the USB specification wIndex parameter which is not the same as the * previous Index parameter. * - The USB_UnhandledControlPacket event (see Events.h) now has new parameter names, to be in line with the * official USB specification. Existing code will need to be altered to use the new parameter names. * - The USB_CreateEndpoints event (see Events.h) has been renamed to USB_ConfigurationChanged, which is more * appropriate. It fires in an identical manner to the previously named event, thus the only change to be made * is the event name itself in the user project. * - The USB_Descriptor_Language_t structure no longer exists in StdDescriptors.h, as this was a * pseudo-descriptor modelled on the string descriptor. It is replaced by the true USB_Descriptor_String_t type * descriptor as indicated in the USB specification, thus all device code must be updated accordingly. * - The names of several Endpoint macros have been changed to be more consistent with the rest of the library, * with no implementation changes. This means that existing code can be altered to use the new macro names * with no other considerations required. See Endpoint.h for the new macro names. * - The previous version of the MassStorage demo had an incorrect value in the SCSI_Request_Sense_Response_t * structure named SenseData in SCSI.c which caused some problems with some hosts. User projects based on this * demo should correct the structure value to maintain compatibility across multiple OS platforms. * - By default, the descriptor structures use the official USB specification names for the elements. Previous * versions of the library used non-standard (but more verbose) names, which are still usable in the current * and future releases when the correct compile time option is enabled. See the StdDescriptors.h file * documentation for more details. * * Host Mode * - The USB_Host_Request_Header_t structure in HostChapter9.h (used for issuing control requests) has had its * members renamed to the official USB specification names for requests. Existing code will need to be updated * to use the new names. * - The names of several Pipe macros have been changed to be more consistent with the rest of the library, * with no implementation changes. This means that existing code can be altered to use the new macro names * with no other considerations required. See Pipe.h for the new macro names. * - By default, the descriptor structures use the official USB specification names for the elements. Previous * versions of the library used non-standard (but more verbose) names, which are still usable in the current * and future releases when the correct compile time option is enabled. See the StdDescriptors.h file * documentation for more details. * - The names of the macros in Host.h for controlling the SOF generation have been renamed, see the Host.h * module documentation for the new macro names. * * Dual Role Mode * - The OTG.h header file has been corrected so that the macros now perform their stated functions. Any existing * projects using custom headers to fix the broken OTG header should now be altered to once again use the OTG * header inside the library. * - The USB_DeviceEnumerationComplete event (see Events.h) now also fires in Device mode, when the host has * finished enumerating the device. Projects relying on the event only firing in Host mode should be updated * so that the event action only occurs when the USB_Mode global is set to USB_MODE_HOST. */