1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
|
/*
LUFA Library
Copyright (C) Dean Camera, 2010.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name of the author not be used in
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
whatsoever resulting from loss of use, data or profits, whether
in an action of contract, negligence or other tortious action,
arising out of or in connection with the use or performance of
this software.
*/
/** \file
* \brief Device mode driver for the library USB Audio 1.0 Class driver.
*
* Device mode driver for the library USB Audio 1.0 Class driver.
*
* \note This file should not be included directly. It is automatically included as needed by the USB module driver
* dispatch header located in LUFA/Drivers/USB.h.
*/
/** \ingroup Group_USBClassAudio
* @defgroup Group_USBClassAudioDevice Audio Class Device Mode Driver
*
* \section Sec_Dependencies Module Source Dependencies
* The following files must be built with any user project that uses this module:
* - LUFA/Drivers/USB/Class/Device/Audio.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
*
* \section Module Description
* Device Mode USB Class driver framework interface, for the Audio 1.0 USB Class driver.
*
* @{
*/
#ifndef _AUDIO_CLASS_DEVICE_H_
#define _AUDIO_CLASS_DEVICE_H_
/* Includes: */
#include "../../USB.h"
#include "../Common/Audio.h"
#include <string.h>
/* Enable C linkage for C++ Compilers: */
#if defined(__cplusplus)
extern "C" {
#endif
/* Preprocessor Checks: */
#if !defined(__INCLUDE_FROM_AUDIO_DRIVER)
#error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
#endif
#if defined(__INCLUDE_FROM_AUDIO_DEVICE_C) && defined(NO_STREAM_CALLBACKS)
#error The NO_STREAM_CALLBACKS compile time option cannot be used in projects using the library Class drivers.
#endif
/* Public Interface - May be used in end-application: */
/* Type Defines: */
/** \brief Audio Class Device Mode Configuration and State Structure.
*
* Class state structure. An instance of this structure should be made for each Audio interface
* within the user application, and passed to each of the Audio class driver functions as the
* AudioInterfaceInfo parameter. This stores each Audio interface's configuration and state information.
*/
typedef struct
{
const struct
{
uint8_t StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this
* structure controls.
*/
uint8_t DataINEndpointNumber; /**< Endpoint number of the incoming Audio Streaming data, if available
* (zero if unused).
*/
uint16_t DataINEndpointSize; /**< Size in bytes of the incoming Audio Streaming data endpoint, if available
* (zero if unused).
*/
uint8_t DataOUTEndpointNumber; /**< Endpoint number of the outgoing Audio Streaming data, if available
* (zero if unused).
*/
uint16_t DataOUTEndpointSize; /**< Size in bytes of the outgoing Audio Streaming data endpoint, if available
* (zero if unused).
*/
} Config; /**< Config data for the USB class interface within the device. All elements in this section
* <b>must</b> be set or the interface will fail to enumerate and operate correctly.
*/
struct
{
bool InterfaceEnabled; /**< Set and cleared by the class driver to indicate if the host has enabled the streaming endpoints
* of the Audio Streaming interface.
*/
} State; /**< State data for the USB class interface within the device. All elements in this section
* are reset to their defaults when the interface is enumerated.
*/
} USB_ClassInfo_Audio_Device_t;
/* Function Prototypes: */
/** Configures the endpoints of a given Audio interface, ready for use. This should be linked to the library
* \ref EVENT_USB_Device_ConfigurationChanged() event so that the endpoints are configured when the configuration containing the
* given Audio interface is selected.
*
* \note The endpoint index numbers as given in the interface's configuration structure must not overlap with any other
* interface, or endpoint bank corruption will occur. Gaps in the allocated endpoint numbers or non-sequential indexes
* within a single interface is allowed, but no two interfaces of any type have have interleaved endpoint indexes.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*
* \return Boolean true if the endpoints were successfully configured, false otherwise.
*/
bool Audio_Device_ConfigureEndpoints(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Processes incoming control requests from the host, that are directed to the given Audio class interface. This should be
* linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*/
void Audio_Device_ProcessControlRequest(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/* Inline Functions: */
/** General management task for a given Audio class interface, required for the correct operation of the interface. This should
* be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*/
static inline void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
(void)AudioInterfaceInfo;
}
/** Determines if the given audio interface is ready for a sample to be read from it, and selects the streaming
* OUT endpoint ready for reading.
*
* \pre This function must only be called when the Device state machine is in the \ref DEVICE_STATE_Configured state or
* the call will fail.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*
* \return Boolean true if the given Audio interface has a sample to be read, false otherwise.
*/
static inline bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
if ((USB_DeviceState != DEVICE_STATE_Configured) || !(AudioInterfaceInfo->State.InterfaceEnabled))
return false;
Endpoint_SelectEndpoint(AudioInterfaceInfo->Config.DataOUTEndpointNumber);
return Endpoint_IsOUTReceived();
}
/** Determines if the given audio interface is ready to accept the next sample to be written to it, and selects
* the streaming IN endpoint ready for writing.
*
* \pre This function must only be called when the Device state machine is in the \ref DEVICE_STATE_Configured state or
* the call will fail.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*
* \return Boolean true if the given Audio interface is ready to accept the next sample, false otherwise.
*/
static inline bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
if ((USB_DeviceState != DEVICE_STATE_Configured) || !(AudioInterfaceInfo->State.InterfaceEnabled))
return false;
Endpoint_SelectEndpoint(AudioInterfaceInfo->Config.DataINEndpointNumber);
return Endpoint_IsINReady();
}
/** Reads the next 8-bit audio sample from the current audio interface.
*
* \pre This should be preceded immediately by a call to the \ref Audio_Device_IsSampleReceived() function to ensure
* ensure the correct endpoint is selected and ready for data.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*
* \return Signed 8-bit audio sample from the audio interface.
*/
static inline int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
int8_t Sample;
(void)AudioInterfaceInfo;
Sample = Endpoint_Read_Byte();
if (!(Endpoint_BytesInEndpoint()))
Endpoint_ClearOUT();
return Sample;
}
/** Reads the next 16-bit audio sample from the current audio interface.
*
* \pre This should be preceded immediately by a call to the \ref Audio_Device_IsSampleReceived() function to ensure
* that the correct endpoint is selected and ready for data.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*
* \return Signed 16-bit audio sample from the audio interface.
*/
static inline int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
int16_t Sample;
(void)AudioInterfaceInfo;
Sample = (int16_t)Endpoint_Read_Word_LE();
if (!(Endpoint_BytesInEndpoint()))
Endpoint_ClearOUT();
return Sample;
}
/** Reads the next 24-bit audio sample from the current audio interface.
*
* \pre This should be preceded immediately by a call to the \ref Audio_Device_IsSampleReceived() function to ensure
* that the correct endpoint is selected and ready for data.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
*
* \return Signed 24-bit audio sample from the audio interface.
*/
static inline int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
int32_t Sample;
(void)AudioInterfaceInfo;
Sample = (((uint32_t)Endpoint_Read_Byte() << 16) | Endpoint_Read_Word_LE());
if (!(Endpoint_BytesInEndpoint()))
Endpoint_ClearOUT();
return Sample;
}
/** Writes the next 8-bit audio sample to the current audio interface.
*
* \pre This should be preceded immediately by a call to the \ref Audio_Device_IsReadyForNextSample() function to
* ensure that the correct endpoint is selected and ready for data.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
* \param[in] Sample Signed 8-bit audio sample.
*/
static inline void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
const int8_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
const int8_t Sample)
{
Endpoint_Write_Byte(Sample);
if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize)
Endpoint_ClearIN();
}
/** Writes the next 16-bit audio sample to the current audio interface.
*
* \pre This should be preceded immediately by a call to the \ref Audio_Device_IsReadyForNextSample() function to
* ensure that the correct endpoint is selected and ready for data.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
* \param[in] Sample Signed 16-bit audio sample.
*/
static inline void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
const int16_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
const int16_t Sample)
{
Endpoint_Write_Word_LE(Sample);
if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize)
Endpoint_ClearIN();
}
/** Writes the next 24-bit audio sample to the current audio interface.
*
* \pre This should be preceded immediately by a call to the \ref Audio_Device_IsReadyForNextSample() function to
* ensure that the correct endpoint is selected and ready for data.
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
* \param[in] Sample Signed 24-bit audio sample.
*/
static inline void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
const int32_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
static inline void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
const int32_t Sample)
{
Endpoint_Write_Byte(Sample >> 16);
Endpoint_Write_Word_LE(Sample);
if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize)
Endpoint_ClearIN();
}
/* Disable C linkage for C++ Compilers: */
#if defined(__cplusplus)
}
#endif
#endif
/** @} */
|