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1/** \file
2 *
3 * This file contains special DoxyGen information for the generation of the main page and other special
4 * documentation pages. It is not a project source file.
5 */
6
7/** \page Page_Migration Migrating from Older Versions
8 *
9 * Below is migration information for updating existing projects based on previous versions of the LUFA library
10 * to the next version released. It does not indicate all new additions to the library in each version change, only
11 * areas relevant to making older projects compatible with the API changes of each new release.
12 *
13 * \section Sec_Migration170418 Version 170418
14 * <b>Device Mode</b>
15 * - The \c CALLBACK_USB_GetDescriptor() callback function into the user application's \c wIndex parameter is now \c uint16_t, not \c uint8_t.
16 *
17 * \section Sec_Migration151115 Migrating from 140928 to 151115
18 * <b>Non-USB Library Components</b>
19 * - The ATPROGRAM LUFA build system module now defaults to the Atmel ICE debugger tool, instead of the Atmel JTAG ICE3.
20 * - The \c Serial_CreateStream() and \c Serial_CreateBlockingStream() functions now require a USART base pointer for XMEGA devices as the first parameter.
21 *
22 * \section Sec_Migration140928 Migrating from 140302 to 140928
23 * <b>Device Mode</b>
24 * - The device mode RNDIS class driver now requires a user-supplied buffer and buffer length to operate, rather
25 * than allocating this buffer internally.
26 *
27 * \section Sec_Migration140302 Migrating from 130901 to 140302
28 * <b>USB Core</b>
29 * - The \c VERSION_BCD() macro has changed from accepting one floating point parameter to taking three distinct major/minor/revision integer parameters, as
30 * some edge cases caused incorrect parsing of the input float into the final integer BCD encoded value.
31 *
32 * <b>Non-USB Library Components</b>
33 * - 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.
34 *
35 * <b>Build System</b>
36 * - The default configuration file for Doxygen is now "doxyfile" rather than "Doxygen.conf", to conform to the Doxygen project's own default file name.
37 * Set \c DOXYGEN_CONF to override the new default file name.
38 *
39 * \section Sec_Migration130901 Migrating from 130303 to 130901
40 * <b>Non-USB Library Components</b>
41 * - The Board Dataflash \c Dataflash_Init() function now automatically configures the appropriate communication interface.
42 *
43 * \section Sec_Migration130303 Migrating from 120730 to 130303
44 * <b>Device Mode</b>
45 * - 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
46 * constant should use the new name, and remove any workarounds for the previously incorrect macro definition.
47 * - The \c HID_KEYBOARD_SC_EQUAL_SIGN macro has been renamed to \ref HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN, and the previous definition of
48 * \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.
49 *
50 * <b>Host Mode</b>
51 * - 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
52 * constant should use the new name, and remove any workarounds for the previously incorrect macro definition.
53 * - The \c HID_KEYBOARD_SC_EQUAL_SIGN macro has been renamed to \ref HID_KEYBOARD_SC_KEYPAD_EQUAL_SIGN, and the previous definition of
54 * \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.
55 *
56 * \section Sec_Migration120730 Migrating from 120219 to 120730
57 * <b>Device Mode</b>
58 * - The device mode Audio Class driver now requires an additional configuration parameter, the Audio Control interface index. Existing applications should
59 * be adjusted to specify the additional configuration parameter.
60 * - 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
61 * 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
62 * application requires more than 3 axis' of data, a custom report descriptor will need to be constructed by hand.
63 * - 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
64 * the direction is obtained from the full endpoint address within the device. Applications calling Endpoint_ConfigureEndpoint() should update their API
65 * 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
66 * of banks.
67 * - All endpoint functions now operate on full endpoint addresses within the device, rather than a directionless endpoint index. Applications should update
68 * their API calls to use full endpoint addresses when required within the device.
69 * - All device mode class drivers have been updated to use a new unified endpoint description structure for all endpoints; existing applications will need
70 * to update their class driver struct instantiation to match the new scheme (see \ref USB_Endpoint_Table_t).
71 * - 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
72 * scheme for the endpoint APIs. Please refer to the target device's datasheet for the maximum bank size of each endpoint.
73 * - The MIDI class driver \ref MIDI_EventPacket_t event packet no longer contains separate \c CableIndex and \c Command entries; these have been combined
74 * 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
75 * element name.
76 *
77 * <b>Host Mode</b>
78 * - The Android Accessory Host class driver property strings are now a array of \c char* rather than a struct of named pointers. Existing applications
79 * should use C99 Designated Initializers with the property string indexes located in \ref AOA_Strings_t instead.
80 * - 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
81 * is now inferred from the full pipe address within the device, and the pipe type. Applications calling Pipe_ConfigurePipe() should update their API
82 * 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.
83 * - All pipe functions now operate on full pipe addresses within the device, rather than a directionless pipe index. Applications should update their API
84 * calls to use full pipe addresses when required within the device.
85 * - 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
86 * their class driver struct instantiation to match the new scheme (see \ref USB_Pipe_Table_t).
87 * - The MIDI class driver \ref MIDI_EventPacket_t event packet no longer contains seperate \c CableIndex and \c Command entries; these have been combined
88 * 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
89 * element name.
90 * - The library "LUFA/Drivers/USB/Core/ConfigDescriptor.c" source file has been renamed "LUFA/Drivers/USB/Core/ConfigDescriptors.c" as this was clashing with
91 * files in some low level host mode demo applications, preventing parallel project builds. If you are referencing the project source files directly instead
92 * of using the makefile module names, you will need to adjust your project makefile.
93 *
94 * \section Sec_Migration120219 Migrating from 111009 to 120219
95 * <b>USB Core</b>
96 * - The HID_KEYBOARD_MODIFER_* macros in the HID class driver have been corrected to HID_KEYBOARD_MODIFIER_* (note the spelling of "modifier").
97 * Existing applications should switch over to the correctly spelled macro names.
98 * - 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
99 * respective class driver files. Projects referencing the class driver source files by filename rather than the LUFA_SRC_USBCLASS makefile
100 * variable should append these postfixes to the source file names. Projects including the USB class driver dispatch headers directly should either
101 * switch to including the main USB driver header instead, or use the updated header filenames.
102 * - 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
103 * the Configuration descriptor's attributes field. As all devices are assumed to be bus-powered unless stated otherwise with the
104 * USB_CONFIG_ATTR_SELFPOWERED flag a replacement constant for bus powered devices is not provided.
105 *
106 * <b>Device Mode</b>
107 * - The device mode Audio class driver now requires a new user application callback, \ref CALLBACK_Audio_Device_GetSetInterfaceProperty().
108 * Existing applications must implement this new callback, however if no audio entities are defined in the audio device's descriptors,
109 * this function may be hard-coded to always return false for previous behaviour to be retained.
110 *
111 * \section Sec_Migration111009 Migrating from 110528 to 111009
112 * <b>Non-USB Library Components</b>
113 * - The \c JTAG_DEBUG_ASSERT() macro has been renamed \ref JTAG_ASSERT() to be consistent with \ref STDOUT_ASSERT().
114 *
115 * <b>USB Core</b>
116 * - By default, unordered Endpoint and Pipe configuration is now allowed once again, via the previous workaround of
117 * reconfiguring all Endpoints/Pipes in order each time a new Endpoint/Pipe is created. To minimize the compiled program
118 * size, the new \c ORDERED_EP_CONFIG compile time option may be defined in the project makefile to restrict the ordering
119 * in exchange for a smaller compiled binary size.
120 * - 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
121 * being far too generic for use in future architecture ports, where multiple clock domains are used.
122 *
123 * <b>Device Mode</b>
124 * - The Endpoint stream functions now all require a \c BytesProcessed parameter instead of the previous callback parameter.
125 * This should be set to \c NULL to retain previous behaviour of the functions, or point to a location where the number of bytes
126 * processed in the current transaction can be stored. If the \c BytesProcessed parameter is non \c NULL, each time the endpoint
127 * bank becomes full and the packet is sent, the routine will exit with the new \ref ENDPOINT_RWSTREAM_IncompleteTransfer
128 * error code to allow the user application to determine when to send the next chunk of data.
129 * - The \ref CDC_Device_SendString() function now expects a null terminated string instead of an explicit length. Existing code
130 * should use the new \ref CDC_Device_SendData() function, or remove the length parameter from the function call.
131 * - The \c Endpoint_ResetFIFO() function has been renamed to \ref Endpoint_ResetEndpoint(), to make the API function names more
132 * consistent. Existing applications using the old function name should simply replace it with a call to the new function name.
133 * - The \c Endpoint_*_Byte() functions have been renamed Endpoint_*_8() to ensure they are correct across all architectures. Existing
134 * code using these functions should replace the previous function names with the new function names.
135 * - The \c Endpoint_*_Word() functions have been renamed Endpoint_*_16() to ensure they are correct across all architectures. Existing
136 * code using these functions should replace the previous function names with the new function names.
137 * - The \c Endpoint_*_DWord() functions have been renamed Endpoint_*_32() to ensure they are correct across all architectures. Existing
138 * code using these functions should replace the previous function names with the new function names.
139 * - The Device mode RNDIS class driver no longer stores the incoming and outgoing packets in the class driver instance; the user is
140 * now expected to manually define a storage location for the packet data. Packets must now be sent and received manually via a call
141 * to \ref RNDIS_Device_ReadPacket() and/or \ref RNDIS_Device_SendPacket().
142 * - The definition of the Audio class \ref USB_Audio_Descriptor_Format_t has been altered, to remove the fixed singular
143 * audio sample rate in the descriptor definition, and to rename the \c SampleFrequencyType to the more appropriate
144 * \c TotalDiscreteSampleRates. Existing applications will need to add an array of \ref USB_Audio_SampleFreq_t elements
145 * immediately following any \ref USB_Audio_Descriptor_Format_t descriptors, and insert the appropriate sampling rates
146 * supported by the device, as well as rename the descriptor elements to match the updated element names.
147 * - The device mode Audio class driver now requires a new user application callback, \ref CALLBACK_Audio_Device_GetSetEndpointProperty().
148 * Existing applications must implement this new callback, however if multiple sample rates or pitch control is not used,
149 * this function may be hard-coded to always return false for previous behaviour to be retained.
150 * - The \c USB_ConfigurationNumber, \c USB_RemoteWakeupEnabled and \c USB_CurrentlySelfPowered globals have been renamed to
151 * \ref USB_Device_ConfigurationNumber, \ref USB_Device_RemoteWakeupEnabled and \ref USB_Device_CurrentlySelfPowered to clearly indicate
152 * the USB mode they relate to. Existing applications using these variables should rename all references to the previous names.
153 * - The \c ENDPOINT_DESCRIPTOR_DIR_IN and \c ENDPOINT_DESCRIPTOR_DIR_OUT macros have now been replaced by \ref ENDPOINT_DIR_IN and
154 * \ref ENDPOINT_DIR_OUT to improve code clarity.
155 * - The \ref HID_DESCRIPTOR_JOYSTICK() macro now takes an additional (first) parameter indicating the number of axis in the joystick.
156 *
157 * <b>Host Mode</b>
158 * - The Pipe stream functions now all require a \c BytesProcessed parameter instead of the previous callback parameter.
159 * This should be set to \c NULL to retain previous behaviour of the functions, or point to a location where the number of bytes
160 * processed in the current transaction can be stored. If the BytesProcessed parameter is non \c NULL, each time the pipe
161 * bank becomes full and the packet is sent, the routine will exit with the new \ref PIPE_RWSTREAM_IncompleteTransfer
162 * error code to allow the user application to determine when to send the next chunk of data.
163 * - The \ref PRNT_Host_SendString() and \ref CDC_Host_SendString() functions now expect a null terminated string instead of an explicit
164 * length. Existing code should use the new \ref PRNT_Host_SendData() and \ref CDC_Host_SendData() functions, or remove the
165 * length parameter from the function call.
166 * - The \c Pipe_ClearErrorFlags() function has been removed, as the pipe error flags are now automatically cleared when the
167 * \ref Pipe_ClearError() function is called.
168 * - The \c Pipe_*_Byte() functions have been renamed Pipe_*_8() to ensure they are correct across all architectures. Existing code using
169 * these functions should replace the previous function names with the new function names.
170 * - The \c Pipe_*_Word() functions have been renamed Pipe_*_16() to ensure they are correct across all architectures. Existing code using
171 * these functions should replace the previous function names with the new function names.
172 * - The \c Pipe_*_DWord() functions have been renamed Pipe_*_32() to ensure they are correct across all architectures. Existing code using
173 * these functions should replace the previous function names with the new function names.
174 * - The \c USB_Host_ClearPipeStall() function has been renamed to USB_Host_ClearEndpointStall(), as it operates on a full endpoint address
175 * within the attached device and not a pipe within the host. Existing code using the old function name should update the function calls and
176 * check for correct usage.
177 *
178 * \section Sec_Migration101122 Migrating from 100807 to 101122
179 * <b>USB Core</b>
180 * - A new USB driver source file, \c Drivers/USB/HighLevel/EndpointStream.c now exists. This source file should be added
181 * to all project makefiles using the USB driver of LUFA, or the makefile should be updated to use the new module source
182 * variables.
183 * - A new USB driver source file, \c Drivers/USB/HighLevel/PipeStream.c now exists. This source file should be added to all
184 * project makefiles using the USB driver of LUFA, or the makefile should be updated to use the new module source variables.
185 * - The \c EVENT_USB_InitFailure() event has been removed, as the \ref USB_Init() function will no longer fail; if not USB mode is
186 * specified, the controller will default to UID selection mode.
187 * - The USB mode specifier constants have been moved into a new enum and renamed. Existing projects should use the equivalent
188 * value in the new \ref USB_Modes_t enum.
189 * - All class driver headers are now included as part of the standard \c LUFA/Drivers/USB/USB.h master dispatch header, and should
190 * no longer be included separately. Class driver module source files must still be added as a separate module in the project's
191 * makefile if used.
192 *
193 * <b>Device Mode</b>
194 * - Endpoints MUST be allocated in ascending order to ensure that bank corruption does not occur. Ensure that your user application
195 * allocated endpoints in ascending order - or if your application uses the USB device mode class drivers, ensure that each instance's
196 * endpoint indexes are not overlapped with other interface's endpoints.
197 * - The signature for the \ref CALLBACK_USB_GetDescriptor() callback has changed, the \c void** \c const \c DescriptorAddress parameter is
198 * now \c const \c void** \c const \c DescriptorAddress. Existing applications should update their callback signatures to match this, and
199 * eliminate any casting of descriptor pointers to a non \c const pointer.
200 * - The names of the class specific descriptor type defines in the USB Class drivers have changed - refer to the driver documentation
201 * for each class driver for the new class specific descriptor type names.
202 * - The \c ENDPOINT_DOUBLEBANK_SUPPORTED() macro is has been renamed \c ENDPOINT_BANKS_SUPPORTED() and now returns the total number of
203 * banks supported by the given endpoint. Existing code should switch to the new naming scheme, and test that the return value of the
204 * macro is equal to or greater than 2 to regain the previous functionality.
205 * - The \c EVENT_USB_Device_UnhandledControlRequest() event is now named \ref EVENT_USB_Device_ControlRequest() and fires before (not after)
206 * the internal library event handlers. Existing code should rename the event handlers in the user application to match the new event
207 * name, and should ensure that the new execution order does not affect the application's operation.
208 *
209 * <b>Host Mode</b>
210 * - Pipes MUST be allocated in ascending order to ensure that bank corruption does not occur. Ensure that your user application
211 * allocated pipes in ascending order - or if your application uses the USB host mode class drivers, ensure that each instance's
212 * pipe indexes are not overlapped with other interface's pipes.
213 * - The \c PRNT_Host_SendData() function has been renamed to \ref PRNT_Host_SendString(). Existing applications should simply
214 * replace all references to the obsolete function name with the new function name.
215 * - The names of the class specific descriptor type defines in the USB Class drivers have changed - refer to the driver documentation
216 * for each class driver for the new class specific descriptor type names.
217 * - The Still Image Host class' function prefix has been changed from \c SImage_ to \c SI_, to remain consistent with the rest of the
218 * driver's enums, type defines and constants.
219 *
220 * \section Sec_Migration100807 Migrating from 100513 to 100807
221 *
222 * <b>Non-USB Library Components</b>
223 * - The Dataflash board driver stub file has changed, as dataflash functions previously located in the internal
224 * Dataflash driver of the library have now been moved to the individual board files. Existing drivers can
225 * copy-paste the new functions from the board Dataflash stub driver.
226 *
227 * <b>USB Core</b>
228 * - A new USB driver source file, \c Drivers/USB/LowLevel/Device.c now exists. This source file should be added to all project
229 * makefiles using the USB driver of LUFA, or the makefile should be updated to use the new module source variables.
230 * - The \c Drivers/USB/LowLevel/DevChapter9.c source file has moved to \c Drivers/USB/HighLevel/DeviceStandardReq.c - this should
231 * be updated in all project makefiles, or the makefile should be updated to use the new module source variables.
232 * - The \c Drivers/USB/LowLevel/HostChapter9.h source file has moved to \c Drivers/USB/HighLevel/HostStandardReq.c - this should
233 * be updated in all project makefiles, or the makefile should be updated to use the new module source variables.
234 * - The \c Drivers/USB/LowLevel/LowLevel.c source file has moved to \c Drivers/LowLevel/USBController.c - this should be updated
235 * in all project makefiles, or the makefile should be updated to use the new module source variables.
236 *
237 * <b>Device Mode</b>
238 * - The \c USB_Device_IsRemoteWakeupSent() macro has been removed, as the remote wakeup request is now fully handled by the
239 * enhanced \ref USB_Device_SendRemoteWakeup() function. Existing code may now discard any checks to \c USB_Device_IsRemoteWakeupSent().
240 * - The \c USB_Device_IsUSBSuspended() macro has been removed, as it is obsolete. Existing code should compare \ref USB_DeviceState
241 * to see if it the device is in the \ref DEVICE_STATE_Suspended state instead.
242 * - The \ref CDC_Device_ReceiveByte() function has changed, and now returns a signed 16-bit integer, with -1 indicating no data was
243 * received. This allows for more efficient coding, as a call to \ref CDC_Device_BytesReceived() is no longer needed if the exact
244 * number of queued bytes received is not needed.
245 *
246 * <b>Host Mode</b>
247 * - The \ref CDC_Host_ReceiveByte() function has changed, and now returns a signed 16-bit integer, with -1 indicating no data was
248 * received. This allows for more efficient coding, as a call to \ref CDC_Host_BytesReceived() is no longer needed if the exact
249 * number of queued bytes received is not needed.
250 * - The \ref CDC_Host_USBTask() now calls \ref CDC_Host_Flush() automatically, flushing any queued data to the attached device. Manual
251 * flushing of the interface is no longer needed if the flushes should be in sync with calls to \ref CDC_Host_USBTask().
252 *
253 * \section Sec_Migration100513 Migrating from 100219 to 100513
254 *
255 * <b>Non-USB Library Components</b>
256 * - The \ref TWI_StartTransmission() function now takes in a timeout period, expressed in milliseconds, within which the addressed
257 * device must respond or the function will abort.
258 *
259 * <b>Device Mode</b>
260 * - The \ref USB_Init() function no longer calls \c sei() to enable global interrupts, as the user application may need
261 * to perform other initialization before it is ready to handle global interrupts. The user application is now responsible
262 * for enabling global interrupts before or shortly after calling \ref USB_Init() to ensure that the enumeration process
263 * functions correctly.
264 * - The \c USBInterrupt.c USB driver source file has been relocated from \c LUFA/Drivers/USB/HighLevel/ to \c LUFA/Drivers/USB/LowLevel.
265 * Projects must update their makefile SRC values accordingly.
266 * - The HID Device Class driver's function signature for the \ref CALLBACK_HID_Device_ProcessHIDReport() function has been changed, to
267 * allow for a new \c ReportType parameter. This new parameter must be added in all user applications using the Device mode HID Class
268 * Driver, but may be ignored unless Host-to-Device FEATURE HID reports are used.
269 *
270 * <b>Host Mode</b>
271 * - The \ref USB_Init() function no longer calls \c sei() to enable global interrupts, as the user application may need
272 * to perform other initialization before it is ready to handle global interrupts. The user application is now responsible
273 * for enabling global interrupts before or shortly after calling \ref USB_Init() to ensure that the enumeration process
274 * functions correctly.
275 * - The \c USBInterrupt.c USB driver source file has been relocated from \c LUFA/Drivers/USB/HighLevel/ to \c LUFA/Drivers/USB/LowLevel.
276 * Projects must update their makefile \c SRC values accordingly.
277 * - The HID Host Class driver's function signature for the \ref HID_Host_SendReportByID() function has been changed, to allow for a new
278 * ReportType parameter. Existing calls to this function should substitute \c REPORT_ITEM_TYPE_Out as this parameter's value.
279 *
280 * \section Sec_Migration100219 Migrating from 091223 to 100219
281 *
282 * <b>Non-USB Library Components</b>
283 * - Due to some ADC channels not being identical to their ADC MUX selection masks for single-ended conversions on some AVR models,
284 * the ADC driver now has explicit masks for each of the standard ADC channels (see \ref Group_ADC). These masks should be used
285 * when calling the ADC functions to ensure proper operation across all AVR models. Note that the \ref ADC_SetupChannel() function
286 * is an exception, and should always be called with a channel number rather than a channel mask.
287 *
288 * <b>Host Mode</b>
289 * - The MIDI Host Class driver send and receive routines now operate on packed events, where multiple MIDI events may be
290 * packed into a single USB packet. This means that the sending of MIDI events will now be delayed until the MIDI send
291 * pipe bank is full. To override this new behaviour and revert to the previous behaviour, the user application may manually
292 * flush the queued event(s) to the device by calling \ref MIDI_Host_Flush().
293 * - The \ref Pipe_IsEndpointBound() function now takes the endpoint's direction into account, by checking if the MSB of the endpoint's address
294 * is set to denote IN endpoints. If the previous functionality where the direction is to be discounted is required, mask the endpoint
295 * address against the \ref PIPE_EPNUM_MASK token before calling \ref Pipe_IsEndpointBound().
296 *
297 * <b>Device Mode</b>
298 * - The MIDI Device Class driver send and receive routines now operate on packed events, where multiple MIDI events may be
299 * packed into a single USB packet. This means that the sending of MIDI events will now be delayed until the MIDI send
300 * endpoint bank is full. To override this new behaviour and revert to the previous behaviour, the user application may manually
301 * flush the queued event(s) to the host by calling \ref MIDI_Device_Flush().
302 *
303 * \section Sec_Migration091223 Migrating from 091122 to 091223
304 *
305 * <b>Host Mode</b>
306 * - The Still Image Host Class driver \ref SI_Host_USBTask() and \ref SI_Host_ConfigurePipes() functions were misnamed, and are
307 * now named \c SImage_Host_USBTask() and \c SImage_Host_ConfigurePipes() respectively.
308 * - The \c HOST_SENDCONTROL_DeviceDisconnect enum value has been renamed to \ref HOST_SENDCONTROL_DeviceDisconnected to be in
309 * line with the rest of the library error codes.
310 * - The HID Parser item usages no longer contain separate minimum and maximum values, as this was a violation of the HID
311 * specification. Instead, the values are distributed evenly across each item as its usage value, to ensure that all items
312 * can be distinguished from one-another.
313 *
314 * <b>Device Mode</b>
315 * - The \ref CALLBACK_HID_Device_CreateHIDReport() HID Device Class driver callback now has a new \c ReportType parameter to
316 * indicate the report type to generate. Existing applications may simply add and ignore this additional parameter.
317 *
318 * \section Sec_Migration091122 Migrating from 090924 to 091122
319 *
320 * <b>Host Mode</b>
321 * - The \c HID_PARSE_UsageStackOverflow HID parser error constant is now named \ref HID_PARSE_UsageListOverflow
322 * - The \ref CALLBACK_HIDParser_FilterHIDReportItem() HID Parser callback now passes a complete \ref HID_ReportItem_t to the
323 * user application, instead of just its attributes.
324 * - The \c USB_GetDeviceConfigDescriptor() function was incorrectly named and is now called \ref USB_Host_GetDeviceConfigDescriptor().
325 *
326 * \section Sec_Migration090924 Migrating from 090810 to 090924
327 *
328 * <b>Non-USB Library Components</b>
329 * - The \c ADC_Off() function has been renamed to \c ADC_ShutDown() to be consistent with the rest of the library.
330 * - The \ref SPI_Init() routine's parameters have changed, so that the clock polarity and data sampling modes can be set. See
331 * the \ref SPI_Init() function documentation for more details
332 * - The \ref Dataflash_Init() routine no longer initializes the SPI bus - the SPI bus should be initialized manually via a
333 * call to \ref SPI_Init() before using the Dataflash driver
334 *
335 * <b>Host Mode</b>
336 * - The \c USB_GetDeviceConfigDescriptor() function's parameters and behaviour has changed; the user is required to
337 * preallocate the largest allowable buffer, and pass the size of the buffer to the function. This allows for a single
338 * call to the function to retrieve, size check and validate the Configuration Descriptor rather than having the user
339 * application perform these intermediary steps.
340 * - The HID report parser now requires a mandatory callback in the user code, to filter only the items the application
341 * is interested in into the processed HID report item structure to save RAM. See \ref CALLBACK_HIDParser_FilterHIDReportItem().
342 * - The HID report parser now always parses FEATURE and always ignores constant-data items - the \c HID_ENABLE_FEATURE_PROCESSING
343 * and \c HID_INCLUDE_CONSTANT_DATA_ITEMS compile time tokens now have no effect.
344 * - The \c USE_NONSTANDARD_DESCRIPTOR_NAMES compile time token has been removed - there are now separate \c USB_Descriptor_*
345 * and \c USB_StdDescriptor_* structures for both the LUFA and standardized element naming conventions so that both may be used in
346 * the one project. For existing projects using the standardized names, change all code to use the \c USB_StdDescriptor_* variants.
347 *
348 * <b>Device Mode</b>
349 * - The \c USE_NONSTANDARD_DESCRIPTOR_NAMES compile time token has been removed - there are now separate \c USB_Descriptor_*
350 * and \c USB_StdDescriptor_* structures for both the LUFA and standardized element naming conventions so that both may be used in
351 * the one project. For existing projects using the standardized names, change all code to use the \c USB_StdDescriptor_* variants.
352 *
353 * \section Sec_Migration090810 Migrating from 090605 to 090810
354 *
355 * <b>All</b>
356 * - The "Simple Scheduler" has been <i>deprecated</i>, as it was little more than an abstracted loop and caused much confusion.
357 * User applications using the scheduler should switch to regular loops instead. The scheduler code will be removed in a future
358 * release.
359 * - The "Dynamic Memory Block Allocator" has been removed, as it was unused in (and unrelated to) the LUFA library and never
360 * used in user applications.
361 *
362 * <b>Non-USB Library Components</b>
363 * - 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
364 * macro names.
365 *
366 * <b>Library Demos</b>
367 * - Most demos now have a corresponding Class Driver implementation, which uses the new internal library class drivers for the standard
368 * USB classes. This allows for more rapid device and host development, and so should be used in preference to the low level APIs where
369 * possible so that fixes to the class drivers propagate to all applications which use them automatically with each new LUFA release.
370 *
371 * <b>Host Mode</b>
372 * - The \c HIDParser.c module has moved from \c LUFA/Drivers/USB/Class/ to \c LUFA/Drivers/USB/Class/Host/.
373 * - The \c USB_GetDeviceConfigDescriptor() function now requires the desired configuration index within the device as its first
374 * parameter, to add support for multi-configuration devices. Existing code should use a configuration index of 1 to indicate the
375 * first configuration descriptor within the device.
376 * - The non-standard "Ready" host state has been removed. Existing \ref HOST_STATE_Configured code should be moved to the end of
377 * the existing \ref HOST_STATE_Addressed state, and the existing HOST_STATE_Ready state code should be moved to the \ref HOST_STATE_Configured
378 * state.
379 * - 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
380 * in the desired state instead.
381 * - The USB event names have been changed and their firing conditions changed to properly separate out Host mode events from Device mode
382 * events. See the \ref Group_Events page for details on the new event names and firing conditions.
383 *
384 * <b>Device Mode</b>
385 * - The \ref CALLBACK_USB_GetDescriptor() function now takes an extra parameter to specify the descriptor's memory space so that
386 * descriptors in mixed memory spaces can be used. The previous functionality can be returned by defining the \c USE_FLASH_DESCRIPTORS
387 * token in the project makefile to fix all descriptors into FLASH space and remove the extra function parameter.
388 * - The \c USB_IsSuspended global has been removed - test \ref USB_DeviceState against \ref DEVICE_STATE_Suspended instead.
389 * - 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
390 * is in the desired state instead.
391 * - The VBUS events have been removed, as they are already exposed to the user via the \c USB_Connect and \c USB_Disconnect events.
392 * - The USB event names have been changed and their firing conditions changed to properly separate out Host mode events from Device mode
393 * events. See the \ref Group_Events page for details on the new event names and firing conditions.
394 *
395 * \section Sec_Migration090605 Migrating from 090510 to 090605
396 *
397 * <b>Device Mode</b>
398 * - Support for non-control data endpoint interrupts has been dropped due to many issues in the implementation. All existing
399 * projects using interrupts on non-control endpoints should switch to polling. For control interrupts, the library can
400 * manage the control endpoint via interrupts automatically by compiling with the \c INTERRUPT_CONTROL_ENDPOINT token defined.
401 * - The \c DESCRIPTOR_ADDRESS() macro has been removed. User applications should use normal casts to obtain a descriptor's memory
402 * address.
403 * - The library events system has been rewritten, so that all macros have been removed to allow for clearer user code. See
404 * \ref Group_Events for new API details.
405 * - The \c STREAM_CALLBACK() macro has been removed. User applications should replace all instances of the macro with regular
406 * function signatures of a function accepting no arguments and returning a \c uint8_t value.
407 * - The \c Event_DeviceError() event no longer exists, as its sole caller (unlinked \c USB_GetDescriptor() function) now produces a
408 * compilation error rather than a runtime error. The \c StdDescriptors.c file no longer exists as a result, and should be removed
409 * from project makefiles.
410 * - The \c USB_GetDescriptor() function has been renamed to \ref CALLBACK_USB_GetDescriptor() to be in line with the new \c CALLBACK_
411 * function prefixes for functions which <i>must</i> be implemented in the user application.
412 *
413 * <b>Host Mode</b>
414 * - Support for non-control data pipe interrupts has been dropped due to many issues in the implementation. All existing
415 * projects using interrupts on non-control pipes should switch to polling.
416 * - The library events system has been rewritten, so that all macros have been removed to allow for clearer user code. See
417 * \ref Group_Events for new API details.
418 * - The \c STREAM_CALLBACK() macro has been removed. User applications should replace all instances of the macro with regular
419 * function signatures of a function accepting no arguments and returning a \c uint8_t value.
420 * - The \c DESCRIPTOR_COMPARATOR() macro has been removed. User applications should replace all instances of the macro with
421 * regular function signatures of a function accepting a void pointer to the descriptor to test, and returning a \c uint8_t value.
422 *
423 * \section Sec_Migration090510 Migrating from 090401 to 090510
424 *
425 * <b>All</b>
426 * - The \c ButtLoadTag.h header has been removed, as it was never used for its intended purpose. Projects should either remove all
427 * \c BUTTLOADTAG() elements, or download and extract \c ButtLoadTag.h header from the ButtLoad project.
428 * - The \c Drivers/AT90USBXXX/ directory has been renamed to \c Drivers/Peripheral/.
429 * - The \c Serial_Stream driver has been renamed to \c SerialStream to remain consistent with the rest of the library naming scheme.
430 * - The HWB driver has changed to the \c Buttons driver. See the board Buttons driver documentation for the new API.
431 *
432 * <b>Dual Role Mode</b>
433 * - The \c USB_PowerOnFail event has been renamed to \c USB_InitFailure.
434 * - 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
435 * details.
436 *
437 * <b>Device Mode</b>
438 * - The \c Endpoint_ClearCurrentBank() macro has been removed, and is now replaced with the \ref Endpoint_ClearIN(), \ref Endpoint_ClearOUT()
439 * macros. See \c Endpoint.h documentation for more details on the new endpoint management macros.
440 * - The \c Endpoint_ReadWriteAllowed() macro has been renamed to \ref Endpoint_IsReadWriteAllowed() to be more consistent with the rest of
441 * the API naming scheme.
442 * - The \c Endpoint_IsSetupINReady() and \c Endpoint_IsSetupOUTReceived() macros have been renamed to \ref Endpoint_IsINReady() and
443 * \ref Endpoint_IsOUTReceived() respectively.
444 * - The \c Endpoint_IsSetupReceived() macro has been renamed to \ref Endpoint_IsSETUPReceived().
445 * - The \c Endpoint_ClearSetupReceived() macro has been renamed to \ref Endpoint_ClearSETUP().
446 * - All endpoint read/write/discard aliases which did not have an explicitly endianness specifier (such as \c Endpoint_Read_Word()) have
447 * been removed for clarity. Existing projects should use the \c _LE suffix on such calls to use the explicit Little Endian versions.
448 * - The \c USB_UnhandledControlPacket event no longer has any parameters. User code should no longer attempt to read in the remainder of
449 * the Control Request header as all Control Request header data is now preloaded by the library and made available in the
450 * USB_ControlRequest structure.
451 * - The \c FEATURELESS_CONTROL_ONLY_DEVICE token has been renamed to \c CONTROL_ONLY_DEVICE.
452 * - The \c STATIC_ENDPOINT_CONFIGURATION is no longer applicable as the library will apply this optimization when appropriate automatically.
453 * - The values of the \ref Endpoint_Stream_RW_ErrorCodes_t and \ref Endpoint_ControlStream_RW_ErrorCodes_t enums have had the \c ERROR_ portion
454 * of their names removed.
455 *
456 * <b>Host Mode</b>
457 * - The \ref USB_Host_SendControlRequest() function no longer automatically selects the Control pipe (pipe 0) to allow it to be used on
458 * other control type pipes. Care should be taken to ensure that the Control pipe is always selected before the function is called
459 * in existing projects where the Control pipe is to be operated on.
460 * - The USB Host management task now saves and restores the currently selected pipe before and after the task runs. Projects no longer
461 * need to manage this manually when calling the USB management task.
462 * - The \c Pipe_ClearCurrentBank() macro has been removed, and is now replaced with the Pipe_ClearIN(), Pipe_ClearOUT() macros. See
463 * Pipe.h documentation for more details on the new pipe management macros.
464 * - The \c Pipe_ReadWriteAllowed() macro has been renamed to \ref Pipe_IsReadWriteAllowed() to be more consistent with the rest of the API
465 * naming scheme.
466 * - The \c Pipe_IsSetupINReceived() and \c Pipe_IsOutReady() macros have been renamed to \ref Pipe_IsINReceived() and \ref Pipe_IsOUTReady()
467 * respectively.
468 * - The new \ref Pipe_ClearSETUP() macro should be used to send SETUP transactions, rather than the previous \c Pipe_ClearSetupOUT() macro.
469 * - The \c Pipe_IsSetupSent() macro has been renamed to \ref Pipe_IsSETUPSent().
470 * - The \c Pipe_ClearSetupSent() macro is no longer applicable and should be removed.
471 * - All pipe read/write/discard aliases which did not have an explicitly endianness specifier (such as \c Pipe_Read_Word()) have
472 * been removed for clarity. Existing projects should use the \c _LE suffix on such calls to use the explicit Little Endian versions.
473 * - The \c Host_IsResetBusDone() macro has been renamed to \c Host_IsBusResetComplete().
474 * - The \c Pipe_Ignore_Word() and \c Pipe_Ignore_DWord() functions have been renamed to \c Pipe_Discard_Word() and \c Pipe_Discard_DWord()
475 * to remain consistent with the rest of the pipe API.
476 * - 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
477 * of the USB headers when \c LUFA/Drivers/USB/USB.h is included.
478 * - Functions in the \c ConfigDescriptor.h header file no longer have \c Host_ as part of their names.
479 * - The \c ProcessHIDReport() has been renamed to \ref USB_ProcessHIDReport(), \c GetReportItemInfo() has been renamed to \ref USB_GetHIDReportItemInfo()
480 * and \c SetReportItemInfo() has been renamed to \ref USB_GetHIDReportItemInfo().
481 * - The values of the \ref DSearch_Return_ErrorCodes_t and \ref DSearch_Comp_Return_ErrorCodes_t enums have had their respective \c Descriptor_Search
482 * and \c Descriptor_Search_Comp prefixes changed to all caps.
483 * - 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
484 * structure type has been renamed to \ref USB_Request_Header_t.
485 * - The values of the \ref Pipe_Stream_RW_ErrorCodes_t enum have had the \c ERROR_ portion of their names removed.
486 *
487 * \section Sec_Migration090401 Migrating from 090209 to 090401
488 *
489 * <b>All</b>
490 * - LUFA projects must now give the raw input clock frequency (before any prescaling) as a compile time constant \c F_USB,
491 * defined in the project makefile and passed to the compiler via the -D switch.
492 * - The makefile EEPROM programming targets for FLIP and dfu-programmer no longer program in the FLASH data in addition to the
493 * EEPROM data into the device. If both are to be programmed, both the EEPROM and FLASH programming targets must be called.
494 * - As the avr-libc macro has been corrected in recent avr-libc distributions, the \c SetSystemClockPrescaler() macro has been removed.
495 * Include \c <avr/power.h> and call \c clock_prescale_set(clock_div_1); instead on recent avr-libc distributions.
496 *
497 * <b>Library Demos</b>
498 * - The USBtoSerial demo now discards all data when not connected to a host, rather than buffering it for later transmission.
499 *
500 * <b>Non-USB Library Components</b>
501 * - The \c ATTR_ALWAYSINLINE function attribute macro has been renamed to \ref ATTR_ALWAYS_INLINE.
502 * - Custom board Dataflash drivers now require the implementation of \ref Dataflash_SelectChipFromPage() and \ref Dataflash_SendAddressBytes().
503 *
504 * <b>Device Mode</b>
505 * - The \c NO_CLEARSET_FEATURE_REQUEST compile time token has been renamed to \c FEATURELESS_CONTROL_ONLY_DEVICE, and its function expanded
506 * to also remove parts of the Get Status chapter 9 request to further reduce code usage. On all applications currently using the
507 * \c NO_CLEARSET_FEATURE_REQUEST compile time token, it can be replaced with the \c FEATURELESS_CONTROL_ONLY_DEVICE token with no further
508 * modifications required.
509 *
510 * \section Sec_Migration090209 Migrating from 081217 to 090209
511 *
512 * <b>Device Mode</b>
513 * - The \c ENDPOINT_MAX_ENDPOINTS constant has been renamed to the more appropriate name of \c ENDPOINT_TOTAL_ENDPOINTS.
514 * - The \c USB_STREAM_TIMEOUT_MS stream timeout default period has been extended to 100ms. This can be overridden in the user
515 * makefile if desired to restore the previous 50ms timeout.
516 *
517 * <b>Host Mode</b>
518 * - The \c PIPE_MAX_ENDPOINTS constant has been renamed to the more appropriate name of \c PIPE_TOTAL_ENDPOINTS.
519 * - The \c USB_STREAM_TIMEOUT_MS stream timeout default period has been extended to 100ms. This can be overridden in the user
520 * makefile if desired to restore the previous 50ms timeout.
521 * - The \c USB_DeviceEnumerationFailed event now contains a second \c SubErrorCode parameter, giving the error code of the function
522 * which failed.
523 * - The \c HID_PARSE_Sucessful enum member constant name has been corrected to \ref HID_PARSE_Successful.
524 *
525 * <b>Non-USB Library Components</b>
526 * - The previous \c SPI_SendByte() functionality is now located in \ref SPI_TransferByte(). \ref SPI_SendByte() now discards the return byte
527 * for speed, to compliment the new \ref SPI_ReceiveByte() function. If bidirectional SPI transfers are required, calls to \ref SPI_SendByte()
528 * should be changed to \ref SPI_TransferByte().
529 * - The serial driver now sets the Tx line as an output explicitly, and enables the pull-up of the Rx line.
530 * - The \ref Serial_Init() and \c SerialStream_Init() functions now take a second \c DoubleSpeed parameter, which indicates if the USART
531 * should be initialized in double speed mode - useful in some circumstances for attaining baud rates not usually possible at the given AVR
532 * clock speed.
533 *
534 * \section Sec_Migration171208 Migrating from V1.5.3 to 081217
535 *
536 * <b>All</b>
537 * - The MyUSB project name has been changed to LUFA (Lightweight Framework for USB AVRs). All references to MyUSB, including macro names,
538 * have been changed to LUFA.
539 *
540 * <b>Library Demos</b>
541 * - The ReconfigureUSART() routine in the USBtoSerial demo was not being called after new line encoding
542 * parameters were set by the host. Projects built on the USBtoSerial code should update to the latest version.
543 * - The HID Parser now supports multiple report (on a single endpoint) HID devices. The MouseHostWithParser and
544 * KeyboardHostWithPaser demos use the updated API functions to function correctly on such devices. Projects
545 * built on either "WithParser" demo should update to the latest code.
546 * - The RNDIS demo TCP stack has been modified so that connections can be properly closed. It is still not
547 * recommended that the MyUSB RNDIS demo TCP/IP stack be used for anything other than demonstration purposes,
548 * as it is neither a full nor a standards compliant implementation.
549 *
550 * <b>Non-USB Library Components</b>
551 * - The Serial_IsCharReceived() macro has been changed to the correct spelling of Serial_IsCharReceived() in Serial.h.
552 *
553 * <b>Device Mode</b>
554 * - The MANUAL_PLL_CONTROL compile time token has been removed, and replaced with a USB_OPT_MANUAL_PLL mask
555 * to be used in the Options parameter of the USB_Init() function.
556 * - Calling USB_Init() now forces a complete USB interface reset and enumeration, even if the USB interface is
557 * currently initialized.
558 * - Interrupts are now disabled when processing control requests, to avoid problems with interrupts causing the library
559 * or user request processing code to exceed the strict USB timing requirements on control transfers.
560 * - The USB Reset event now resets and disables all device endpoints. If user code depends on endpoints remaining configured
561 * after a Reset event, it should be altered to explicitly re-initialize all user endpoints.
562 * - The prototype for the GetDescriptor function has been changed, as the return value was redundant. The function now
563 * returns the size of the descriptor, rather than passing it back via a parameter, or returns NO_DESCRIPTOR if the specified
564 * descriptor does not exist.
565 * - The NO_DESCRIPTOR_STRING macro has been renamed NO_DESCRIPTOR, and is now also used as a possible return value for the
566 * GetDescriptor function.
567 *
568 * <b>Host Mode</b>
569 * - The MANUAL_PLL_CONTROL compile time token has been removed, and replaced with a USB_OPT_MANUAL_PLL mask
570 * to be used in the Options parameter of the USB_Init() function.
571 * - The HID report parser now supports multiple Report IDs. The HID report parser GetReportItemInfo() and
572 * SetReportItemInfo() routines now return a boolean, set if the requested report item was located in the
573 * current report. If sending a report to a multi-report device, the first byte of the report is automatically
574 * set to the report ID of the given report item.
575 * - Calling USB_Init() now forces a complete USB interface reset and enumeration, even if the USB interface is
576 * currently initialized.
577 *
578 * \section Sec_Migration152 Migrating from V1.5.2 to V1.5.3
579 *
580 * <b>Library Demos</b>
581 * - Previously, all demos contained a serial number string descriptor, filled with all zeros. A serial number
582 * string is required in Mass Storage devices, or devices which are to retain settings when moved between
583 * ports on a machine. As people were not changing the serial number value, this was causing conflicts and so
584 * the serial number descriptor has been removed from all but the Mass Storage demo, which requires it.
585 * - The AudioOut and AudioIn demos did not previously silence their endpoints when the host has deactivated
586 * them. Projects built upon either demo should upgrade to the latest code.
587 * - The FEATURE_ENDPOINT macro has been renamed FEATURE_ENDPOINT_HALT, and is now correctly documented.
588 * - The MassStoreHost demo contained errors which caused it to lock up randomly on certain devices. Projects built
589 * on the MassStoreDemo code should update to the latest version.
590 * - The Interrupt type endpoint in the CDC based demos previously had a polling interval of 0x02, which caused
591 * problems on some Linux systems. This has been changed to 0xFF, projects built on the CDC demos should upgrade
592 * to the latest code.
593 * - The HID keyboard and mouse demos were not previously boot mode compatible. To enable boot mode support, projects
594 * built on the keyboard or mouse demos (or derivatives) should upgrade to the latest code.
595 * - The Mass Storage demo was not previously standards compliant. Projects built on the Mass Storage demo should
596 * upgrade to the latest code.
597 * - The USART was not being reconfigured after the host sent new encoding settings in the USBtoSerial demo. This was
598 * previously discovered and fixed, but the change was lost. Projects built on the USBtoSerial demo should update
599 * to the latest code.
600 *
601 * <b>Device Mode</b>
602 * - The endpoint non-control stream functions now have a default timeout of 50ms between packets in the stream.
603 * If this timeout is exceeded, the function returns the new ENDPOINT_RWSTREAM_ERROR_Timeout error value. The
604 * timeout value can be overridden by defining the USB_STREAM_TIMEOUT_MS in the project makefile to the desired
605 * timeout duration in ms.
606 * - Rather than returning fixed values, the flags indicating if the device has Remote Wakeup currently enabled
607 * and/or is self-powered are now accessed and set through the new USB_RemoteWakeupEnabled and
608 * USB_CurrentlySelfPowered macros. See the DevChapter9.h documentation for more details.
609 * - All endpoint stream functions now require an extra Callback function parameter. Existing code may be updated
610 * to either supply NO_STREAM_CALLBACK as the extra parameter, or disable stream callbacks altogether by passing
611 * the token NO_STREAM_CALLBACKS to the compiler using the -D switch.
612 *
613 * <b>Host Mode</b>
614 * - The pipe non-control stream functions now have a default timeout of 50ms between packets in the stream.
615 * If this timeout is exceeded, the function returns the new PIPE_RWSTREAM_ERROR_Timeout error value. The
616 * timeout value can be overridden by defining the USB_STREAM_TIMEOUT_MS in the project makefile to the desired
617 * timeout duration in ms.
618 * - CollectionPath_t has been renamed to HID_CollectionPath_t to be more in line with the other HID parser structures.
619 * - All pipe stream functions now require an extra Callback function parameter. Existing code may be updated
620 * to either supply NO_STREAM_CALLBACK as the extra parameter, or disable stream callbacks altogether by passing
621 * the token NO_STREAM_CALLBACKS to the compiler using the -D switch.
622 *
623 * \section Sec_Migration151 Migrating from V1.5.1 to V1.5.2
624 *
625 * <b>Library Demos</b>
626 * - The RNDIS demo application has been updated so that it is functional on Linux under earlier implementations
627 * of the RNDIS specification, which had non-standard behaviour. Projects built upon the demo should upgrade
628 * to the latest code.
629 * - The DFU class bootloader has had several bugs corrected in this release. It is recommended that where
630 * possible any existing devices upgrade to the latest bootloader code.
631 *
632 * \section Sec_Migration150 Migrating from V1.5.0 to V1.5.1
633 *
634 * <b>Library Demos</b>
635 * - The USBtoSerial demo was broken in the 1.5.0 release, due to incorrect register polling in place of the
636 * global "Transmitting" flag. The change has been reverted in this release. Projects built upon the demo
637 * should upgrade to the latest code.
638 * - The HID class demos did not implement the mandatory GetReport HID class request. Projects built upon the HID
639 * demos should upgrade to the latest code.
640 * - The HID class demos incorrectly reported themselves as boot-protocol enabled HID devices in their descriptors.
641 * Projects built upon the HID demos should upgrade to the latest code.
642 * - The MIDI device demo had incorrect AudioStreaming interface descriptors. Projects built upon the MIDI demo
643 * should upgrade to the latest code.
644 * - The AudioOut demo did not correctly tristate the speaker pins when USB was disconnected, wasting power.
645 * Projects built upon the AudioOut demo should upgrade to the latest code.
646 *
647 * \section Sec_Migration141 Migrating from V1.4.1 to V1.5.0
648 *
649 * <b>Library Demos</b>
650 * - Previous versions of the library demos had incorrectly encoded BCD version numbers in the descriptors. To
651 * avoid such mistakes in the future, the VERSION_BCD macro has been added to StdDescriptors.h. Existing
652 * projects should at least manually correct the BCD version numbers, or preferably update the descriptors to
653 * encode the version number in BCD format using the new macro.
654 * - The mandatory GetReport class-specific request was accidentally omitted from previous versions of the demos
655 * based on the Human Interface Device (HID) class. This has been corrected, and any user projects based on the
656 * HID demos should also be updated accordingly.
657 * - The CDC demos now correctly send an empty packet directly after a full packet, to end the transmission.
658 * Failure to do this on projects which always or frequently send full packets will cause buffering issues on
659 * the host OS. All CDC user projects are advised to update their transmission routines in the same manner as
660 * the library CDC demos.
661 * - The previous interrupt-driven Endpoint/Pipe demos did not properly save and restore the currently selected
662 * Endpoint/Pipe when the ISR fired. This has been corrected - user projects based on the interrupt driven
663 * demos should also update to properly save and restore the selected Endpoint/Pipe.
664 *
665 * <b>Non-USB Library Components</b>
666 * - The Atomic.h and ISRMacro.h header files in MyUSB/Common have been removed, as the library is now only
667 * compatible with avr-libc library versions newer than the time before the functionality of the deleted
668 * headers was available.
669 *
670 * <b>Device Mode</b>
671 * - The GetDescriptor function (see StdDescriptors.h) now has a new prototype, with altered parameter names and
672 * functions. Existing projects will need to update the GetDescriptor implementation to reflect the new API.
673 * The previously split Type and Index parameters are now passed as the original wValue parameter to the
674 * function, to make way for the USB specification wIndex parameter which is <i>not</i> the same as the
675 * previous Index parameter.
676 * - The USB_UnhandledControlPacket event (see Events.h) now has new parameter names, to be in line with the
677 * official USB specification. Existing code will need to be altered to use the new parameter names.
678 * - The USB_CreateEndpoints event (see Events.h) has been renamed to USB_ConfigurationChanged, which is more
679 * appropriate. It fires in an identical manner to the previously named event, thus the only change to be made
680 * is the event name itself in the user project.
681 * - The USB_Descriptor_Language_t structure no longer exists in StdDescriptors.h, as this was a
682 * pseudo-descriptor modeled on the string descriptor. It is replaced by the true USB_Descriptor_String_t type
683 * descriptor as indicated in the USB specification, thus all device code must be updated accordingly.
684 * - The names of several Endpoint macros have been changed to be more consistent with the rest of the library,
685 * with no implementation changes. This means that existing code can be altered to use the new macro names
686 * with no other considerations required. See Endpoint.h for the new macro names.
687 * - The previous version of the MassStorage demo had an incorrect value in the SCSI_Request_Sense_Response_t
688 * structure named SenseData in SCSI.c which caused some problems with some hosts. User projects based on this
689 * demo should correct the structure value to maintain compatibility across multiple OS platforms.
690 * - By default, the descriptor structures use the official USB specification names for the elements. Previous
691 * versions of the library used non-standard (but more verbose) names, which are still usable in the current
692 * and future releases when the correct compile time option is enabled. See the StdDescriptors.h file
693 * documentation for more details.
694 *
695 * <b>Host Mode</b>
696 * - The USB_Host_Request_Header_t structure in HostChapter9.h (used for issuing control requests) has had its
697 * members renamed to the official USB specification names for requests. Existing code will need to be updated
698 * to use the new names.
699 * - The names of several Pipe macros have been changed to be more consistent with the rest of the library,
700 * with no implementation changes. This means that existing code can be altered to use the new macro names
701 * with no other considerations required. See Pipe.h for the new macro names.
702 * - By default, the descriptor structures use the official USB specification names for the elements. Previous
703 * versions of the library used non-standard (but more verbose) names, which are still usable in the current
704 * and future releases when the correct compile time option is enabled. See the StdDescriptors.h file
705 * documentation for more details.
706 * - The names of the macros in Host.h for controlling the SOF generation have been renamed, see the Host.h
707 * module documentation for the new macro names.
708 *
709 * <b>Dual Role Mode</b>
710 * - The OTG.h header file has been corrected so that the macros now perform their stated functions. Any existing
711 * projects using custom headers to fix the broken OTG header should now be altered to once again use the OTG
712 * header inside the library.
713 * - The USB_DeviceEnumerationComplete event (see Events.h) now also fires in Device mode, when the host has
714 * finished enumerating the device. Projects relying on the event only firing in Host mode should be updated
715 * so that the event action only occurs when the USB_Mode global is set to USB_MODE_HOST.
716 */
717
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