LUFA/Drivers/USB/Class/Device/Audio.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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 disclaim 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 /** \ingroup Group_USBClassAudio
  32  *  @defgroup Group_USBClassAudioDevice Audio Class Device Mode Driver
  33  *
  34  *  \section Sec_Dependencies Module Source Dependencies
  35  *  The following files must be built with any user project that uses this module:
  36  *    - LUFA/Drivers/USB/Class/Device/Audio.c
  37  *
  38  *  \section Module Description
  39  *  Device Mode USB Class driver framework interface, for the Audio USB Class driver.
  40  *
  41  *  @{
  42  */
  43
  44 #ifndef _AUDIO_CLASS_DEVICE_H_
  45 #define _AUDIO_CLASS_DEVICE_H_
  46
  47         /* Includes: */
  48                 #include "../../USB.h"
  49                 #include "../Common/Audio.h"
  50
  51                 #include <string.h>
  52
  53         /* Enable C linkage for C++ Compilers: */
  54                 #if defined(__cplusplus)
  55                         extern "C" {
  56                 #endif
  57
  58         /* Public Interface - May be used in end-application: */
  59                 /* Type Defines: */
  60                         /** Class state structure. An instance of this structure should be made for each Audio interface
  61                          *  within the user application, and passed to each of the Audio class driver functions as the
  62                          *  AudioInterfaceInfo parameter. This stores each Audio interface's configuration and state information.
  63                          */
  64                         typedef struct
  65                         {
  66                                 const struct
  67                                 {
  68                                         uint8_t  StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this
  69                                                                                                                 *   structure controls.
  70                                                                                                                 */
  71
  72                                         uint8_t  DataINEndpointNumber; /**< Endpoint number of the incomming Audio Streaming data, if available
  73                                                                                                         *   (zero if unused).
  74                                                                                                         */
  75                                         uint16_t DataINEndpointSize; /**< Size in bytes of the incomming Audio Streaming data endpoint, if available
  76                                                                                                   *   (zero if unused).
  77                                                                                                   */
  78
  79                                         uint8_t  DataOUTEndpointNumber; /**< Endpoint number of the outgoing Audio Streaming data, if available
  80                                                                                                          *   (zero if unused).
  81                                                                                                          */
  82                                         uint16_t DataOUTEndpointSize; /**< Size in bytes of the outgoing Audio Streaming data endpoint, if available
  83                                                                                                    *   (zero if unused).
  84                                                                                                    */
  85                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  86                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  87                                            */
  88                                 struct
  89                                 {
  90                                         bool     InterfaceEnabled; /**< Set and cleared by the class driver to indicate if the host has enabled the streaming endpoints
  91                                                                                                 *   of the Audio Streaming interface.
  92                                                                                                 */
  93                                 } State; /**< State data for the USB class interface within the device. All elements in this section
  94                                           *   are reset to their defaults when the interface is enumerated.
  95                                           */
  96                         } USB_ClassInfo_Audio_Device_t;
  97
  98                 /* Function Prototypes: */
  99                         /** Configures the endpoints of a given Audio interface, ready for use. This should be linked to the library
 100                          *  \ref EVENT_USB_ConfigurationChanged() event so that the endpoints are configured when the configuration containing the
 101                          *  given Audio interface is selected.
 102                          *
 103                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 104                          *
 105                          *  \return Boolean true if the endpoints were sucessfully configured, false otherwise
 106                          */
 107                         bool Audio_Device_ConfigureEndpoints(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 108
 109                         /** Processes incomming control requests from the host, that are directed to the given Audio class interface. This should be
 110                          *  linked to the library \ref EVENT_USB_UnhandledControlPacket() event.
 111                          *
 112                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 113                          */
 114                         void Audio_Device_ProcessControlPacket(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 115
 116                         /** General management task for a given Audio class interface, required for the correct operation of the interface. This should
 117                          *  be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
 118                          *
 119                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 120                          */
 121                         void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 122
 123                         /** Reads the next 8-bit audio sample from the current audio interface.
 124                          *
 125                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that
 126                          *        the correct endpoint is selected and ready for data.
 127                          *
 128                          *  \return  Signed 8-bit audio sample from the audio interface
 129                          */
 130                         int8_t Audio_Device_ReadSample8(void);
 131
 132                         /** Reads the next 16-bit audio sample from the current audio interface.
 133                          *
 134                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that
 135                          *        the correct endpoint is selected and ready for data.
 136                          *
 137                          *  \return  Signed 16-bit audio sample from the audio interface
 138                          */
 139                         int16_t Audio_Device_ReadSample16(void);
 140
 141                         /** Reads the next 24-bit audio sample from the current audio interface.
 142                          *
 143                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that
 144                          *        the correct endpoint is selected and ready for data.
 145                          *
 146                          *  \return  Signed 24-bit audio sample from the audio interface
 147                          */
 148                         int32_t Audio_Device_ReadSample24(void);
 149
 150                         /** Writes the next 8-bit audio sample to the current audio interface.
 151                          *
 152                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that
 153                          *        the correct endpoint is selected and ready for data.
 154                          *
 155                          *  \param[in] Sample  Signed 8-bit audio sample
 156                          */
 157                         void Audio_Device_WriteSample8(const int8_t Sample);
 158
 159                         /** Writes the next 16-bit audio sample to the current audio interface.
 160                          *
 161                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that
 162                          *        the correct endpoint is selected and ready for data.
 163                          *
 164                          *  \param[in] Sample  Signed 16-bit audio sample
 165                          */
 166                         void Audio_Device_WriteSample16(const int16_t Sample);
 167
 168                         /** Writes the next 24-bit audio sample to the current audio interface.
 169                          *
 170                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that
 171                          *        the correct endpoint is selected and ready for data.
 172                          *
 173                          *  \param[in] Sample  Signed 24-bit audio sample
 174                          */
 175                         void Audio_Device_WriteSample24(const int32_t Sample);
 176
 177                         /** Determines if the given audio interface is ready for a sample to be read from it.
 178                          *
 179                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 180                          *
 181                          *  \return Boolean true if the given Audio interface has a sample to be read, false otherwise
 182                          */
 183                         bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 184
 185                         /** Determines if the given audio interface is ready to accept the next sample to be written to it.
 186                          *
 187                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 188                          *
 189                          *  \return Boolean true if the given Audio interface is ready to accept the next sample, false otherwise
 190                          */
 191                         bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 192
 193         /* Disable C linkage for C++ Compilers: */
 194                 #if defined(__cplusplus)
 195                         }
 196                 #endif
 197
 198 #endif
 199
 200 /** @} */