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1/*
2 LUFA Library
3 Copyright (C) Dean Camera, 2017.
4
5 dean [at] fourwalledcubicle [dot] com
6 www.lufa-lib.org
7*/
8
9/*
10 Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
11
12 Permission to use, copy, modify, distribute, and sell this
13 software and its documentation for any purpose is hereby granted
14 without fee, provided that the above copyright notice appear in
15 all copies and that both that the copyright notice and this
16 permission notice and warranty disclaimer appear in supporting
17 documentation, and that the name of the author not be used in
18 advertising or publicity pertaining to distribution of the
19 software without specific, written prior permission.
20
21 The author disclaims all warranties with regard to this
22 software, including all implied warranties of merchantability
23 and fitness. In no event shall the author be liable for any
24 special, indirect or consequential damages or any damages
25 whatsoever resulting from loss of use, data or profits, whether
26 in an action of contract, negligence or other tortious action,
27 arising out of or in connection with the use or performance of
28 this software.
29*/
30
31/** \file
32 * \brief Device mode driver for the library USB Audio 1.0 Class driver.
33 *
34 * Device mode driver for the library USB Audio 1.0 Class driver.
35 *
36 * \note This file should not be included directly. It is automatically included as needed by the USB module driver
37 * dispatch header located in LUFA/Drivers/USB.h.
38 */
39
40/** \ingroup Group_USBClassAudio
41 * \defgroup Group_USBClassAudioDevice Audio 1.0 Class Device Mode Driver
42 *
43 * \section Sec_USBClassAudioDevice_Dependencies Module Source Dependencies
44 * The following files must be built with any user project that uses this module:
45 * - LUFA/Drivers/USB/Class/Device/AudioClassDevice.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
46 *
47 * \section Sec_USBClassAudioDevice_ModDescription Module Description
48 * Device Mode USB Class driver framework interface, for the Audio 1.0 USB Class driver.
49 *
50 * @{
51 */
52
53#ifndef _AUDIO_CLASS_DEVICE_H_
54#define _AUDIO_CLASS_DEVICE_H_
55
56 /* Includes: */
57 #include "../../USB.h"
58 #include "../Common/AudioClassCommon.h"
59
60 /* Enable C linkage for C++ Compilers: */
61 #if defined(__cplusplus)
62 extern "C" {
63 #endif
64
65 /* Preprocessor Checks: */
66 #if !defined(__INCLUDE_FROM_AUDIO_DRIVER)
67 #error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
68 #endif
69
70 /* Public Interface - May be used in end-application: */
71 /* Type Defines: */
72 /** \brief Audio Class Device Mode Configuration and State Structure.
73 *
74 * Class state structure. An instance of this structure should be made for each Audio interface
75 * within the user application, and passed to each of the Audio class driver functions as the
76 * \c AudioInterfaceInfo parameter. This stores each Audio interface's configuration and state information.
77 */
78 typedef struct
79 {
80 struct
81 {
82 uint8_t ControlInterfaceNumber; /**< Index of the Audio Control interface within the device this
83 * structure controls.
84 */
85 uint8_t StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this
86 * structure controls.
87 */
88
89 USB_Endpoint_Table_t DataINEndpoint; /**< Data IN endpoint configuration table. */
90 USB_Endpoint_Table_t DataOUTEndpoint; /**< Data OUT endpoint configuration table. */
91 } Config; /**< Config data for the USB class interface within the device. All elements in this section
92 * <b>must</b> be set or the interface will fail to enumerate and operate correctly.
93 */
94 struct
95 {
96 bool InterfaceEnabled; /**< Set and cleared by the class driver to indicate if the host has enabled the streaming endpoints
97 * of the Audio Streaming interface.
98 */
99 } State; /**< State data for the USB class interface within the device. All elements in this section
100 * are reset to their defaults when the interface is enumerated.
101 */
102 } USB_ClassInfo_Audio_Device_t;
103
104 /* Function Prototypes: */
105 /** Configures the endpoints of a given Audio interface, ready for use. This should be linked to the library
106 * \ref EVENT_USB_Device_ConfigurationChanged() event so that the endpoints are configured when the configuration containing the
107 * given Audio interface is selected.
108 *
109 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
110 *
111 * \return Boolean \c true if the endpoints were successfully configured, \c false otherwise.
112 */
113 bool Audio_Device_ConfigureEndpoints(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
114
115 /** Processes incoming control requests from the host, that are directed to the given Audio class interface. This should be
116 * linked to the library \ref EVENT_USB_Device_ControlRequest() event.
117 *
118 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
119 */
120 void Audio_Device_ProcessControlRequest(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
121
122 /** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented
123 * in the user application to handle property manipulations on streaming audio endpoints.
124 *
125 * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
126 * the given endpoint index, and should return as fast as possible. When non-NULL, this value may be altered for GET operations
127 * to indicate the size of the retrieved data.
128 *
129 * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
130 * of the \c DataLength parameter.
131 *
132 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
133 * \param[in] EndpointProperty Property of the endpoint to get or set, a value from \ref Audio_ClassRequests_t.
134 * \param[in] EndpointAddress Address of the streaming endpoint whose property is being referenced.
135 * \param[in] EndpointControl Parameter of the endpoint to get or set, a value from \ref Audio_EndpointControls_t.
136 * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
137 * length of the retrieved data. When NULL, the function should return whether the given property
138 * and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
139 * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
140 * the retrieved data is to be stored for GET operations.
141 *
142 * \return Boolean \c true if the property GET/SET was successful, \c false otherwise
143 */
144 bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
145 const uint8_t EndpointProperty,
146 const uint8_t EndpointAddress,
147 const uint8_t EndpointControl,
148 uint16_t* const DataLength,
149 uint8_t* Data) ATTR_NON_NULL_PTR_ARG(1);
150
151 /** Audio class driver callback for the setting and retrieval of streaming interface properties. This callback must be implemented
152 * in the user application to handle property manipulations on streaming audio interfaces.
153 *
154 * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
155 * the given entity and should return as fast as possible. When non-NULL, this value may be altered for GET operations
156 * to indicate the size of the retrieved data.
157 *
158 * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
159 * of the \c DataLength parameter.
160 *
161 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
162 * \param[in] Property Property of the interface to get or set, a value from \ref Audio_ClassRequests_t.
163 * \param[in] EntityAddress Address of the audio entity whose property is being referenced.
164 * \param[in] Parameter Parameter of the entity to get or set, specific to each type of entity (see USB Audio specification).
165 * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
166 * length of the retrieved data. When NULL, the function should return whether the given property
167 * and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
168 * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
169 * the retrieved data is to be stored for GET operations.
170 *
171 * \return Boolean \c true if the property GET/SET was successful, \c false otherwise
172 */
173 bool CALLBACK_Audio_Device_GetSetInterfaceProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
174 const uint8_t Property,
175 const uint8_t EntityAddress,
176 const uint16_t Parameter,
177 uint16_t* const DataLength,
178 uint8_t* Data) ATTR_NON_NULL_PTR_ARG(1);
179
180 /** Audio class driver event for an Audio Stream start/stop change. This event fires each time the device receives a stream enable or
181 * disable control request from the host, to start and stop the audio stream. The current state of the stream can be determined by the
182 * State.InterfaceEnabled value inside the Audio interface structure passed as a parameter.
183 *
184 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
185 */
186 void EVENT_Audio_Device_StreamStartStop(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
187
188 /* Inline Functions: */
189 /** General management task for a given Audio class interface, required for the correct operation of the interface. This should
190 * be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
191 *
192 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
193 */
194 static inline void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
195 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
196 static inline void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
197 {
198 (void)AudioInterfaceInfo;
199 }
200
201 /** Determines if the given audio interface is ready for a sample to be read from it, and selects the streaming
202 * OUT endpoint ready for reading.
203 *
204 * \pre This function must only be called when the Device state machine is in the \ref DEVICE_STATE_Configured state or
205 * the call will fail.
206 *
207 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
208 *
209 * \return Boolean \c true if the given Audio interface has a sample to be read, \c false otherwise.
210 */
211 static inline bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
212 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
213 static inline bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
214 {
215 if ((USB_DeviceState != DEVICE_STATE_Configured) || !(AudioInterfaceInfo->State.InterfaceEnabled))
216 return false;
217
218 Endpoint_SelectEndpoint(AudioInterfaceInfo->Config.DataOUTEndpoint.Address);
219 return Endpoint_IsOUTReceived();
220 }
221
222 /** Determines if the given audio interface is ready to accept the next sample to be written to it, and selects
223 * the streaming IN endpoint ready for writing.
224 *
225 * \pre This function must only be called when the Device state machine is in the \ref DEVICE_STATE_Configured state or
226 * the call will fail.
227 *
228 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
229 *
230 * \return Boolean \c true if the given Audio interface is ready to accept the next sample, \c false otherwise.
231 */
232 static inline bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
233 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
234 static inline bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
235 {
236 if ((USB_DeviceState != DEVICE_STATE_Configured) || !(AudioInterfaceInfo->State.InterfaceEnabled))
237 return false;
238
239 Endpoint_SelectEndpoint(AudioInterfaceInfo->Config.DataINEndpoint.Address);
240 return Endpoint_IsINReady();
241 }
242
243 /** Reads the next 8-bit audio sample from the current audio interface.
244 *
245 * \pre This should be preceded immediately by a call to the \ref Audio_Device_IsSampleReceived() function to ensure
246 * that the correct endpoint is selected and ready for data.
247 *
248 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
249 *
250 * \return Signed 8-bit audio sample from the audio interface.
251 */
252 static inline int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
253 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
254 static inline int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
255 {
256 int8_t Sample;
257
258 (void)AudioInterfaceInfo;
259
260 Sample = Endpoint_Read_8();
261
262 if (!(Endpoint_BytesInEndpoint()))
263 Endpoint_ClearOUT();
264
265 return Sample;
266 }
267
268 /** Reads the next 16-bit audio sample from the current audio interface.
269 *
270 * \pre This should be preceded immediately by a call to the \ref Audio_Device_IsSampleReceived() function to ensure
271 * that the correct endpoint is selected and ready for data.
272 *
273 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
274 *
275 * \return Signed 16-bit audio sample from the audio interface.
276 */
277 static inline int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
278 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
279 static inline int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
280 {
281 int16_t Sample;
282
283 (void)AudioInterfaceInfo;
284
285 Sample = (int16_t)Endpoint_Read_16_LE();
286
287 if (!(Endpoint_BytesInEndpoint()))
288 Endpoint_ClearOUT();
289
290 return Sample;
291 }
292
293 /** Reads the next 24-bit audio sample from the current audio interface.
294 *
295 * \pre This should be preceded immediately by a call to the \ref Audio_Device_IsSampleReceived() function to ensure
296 * that the correct endpoint is selected and ready for data.
297 *
298 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
299 *
300 * \return Signed 24-bit audio sample from the audio interface.
301 */
302 static inline int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
303 ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
304 static inline int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
305 {
306 int32_t Sample;
307
308 (void)AudioInterfaceInfo;
309
310 Sample = (((uint32_t)Endpoint_Read_8() << 16) | Endpoint_Read_16_LE());
311
312 if (!(Endpoint_BytesInEndpoint()))
313 Endpoint_ClearOUT();
314
315 return Sample;
316 }
317
318 /** Writes the next 8-bit audio sample to the current audio interface.
319 *
320 * \pre This should be preceded immediately by a call to the \ref Audio_Device_IsReadyForNextSample() function to
321 * ensure that the correct endpoint is selected and ready for data.
322 *
323 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
324 * \param[in] Sample Signed 8-bit audio sample.
325 */
326 static inline void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
327 const int8_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
328 static inline void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
329 const int8_t Sample)
330 {
331 Endpoint_Write_8(Sample);
332
333 if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpoint.Size)
334 Endpoint_ClearIN();
335 }
336
337 /** Writes the next 16-bit audio sample to the current audio interface.
338 *
339 * \pre This should be preceded immediately by a call to the \ref Audio_Device_IsReadyForNextSample() function to
340 * ensure that the correct endpoint is selected and ready for data.
341 *
342 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
343 * \param[in] Sample Signed 16-bit audio sample.
344 */
345 static inline void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
346 const int16_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
347 static inline void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
348 const int16_t Sample)
349 {
350 Endpoint_Write_16_LE(Sample);
351
352 if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpoint.Size)
353 Endpoint_ClearIN();
354 }
355
356 /** Writes the next 24-bit audio sample to the current audio interface.
357 *
358 * \pre This should be preceded immediately by a call to the \ref Audio_Device_IsReadyForNextSample() function to
359 * ensure that the correct endpoint is selected and ready for data.
360 *
361 * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
362 * \param[in] Sample Signed 24-bit audio sample.
363 */
364 static inline void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
365 const int32_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
366 static inline void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
367 const int32_t Sample)
368 {
369 Endpoint_Write_16_LE(Sample);
370 Endpoint_Write_8(Sample >> 16);
371
372 if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpoint.Size)
373 Endpoint_ClearIN();
374 }
375
376 /* Private Interface - For use in library only: */
377 #if !defined(__DOXYGEN__)
378 /* Function Prototypes: */
379 #if defined(__INCLUDE_FROM_AUDIO_DEVICE_C)
380 void Audio_Device_Event_Stub(void) ATTR_CONST;
381
382 void EVENT_Audio_Device_StreamStartStop(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
383 ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(Audio_Device_Event_Stub);
384 #endif
385
386 #endif
387
388 /* Disable C linkage for C++ Compilers: */
389 #if defined(__cplusplus)
390 }
391 #endif
392
393#endif
394
395/** @} */
396
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