LUFA/Drivers/USB/Class/Host/MIDI.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_USBClassMIDI
  32  *  @defgroup Group_USBClassMIDIHost MIDI Class Host 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/Host/MIDI.c
  37  *
  38  *  \section Module Description
  39  *  Host Mode USB Class driver framework interface, for the MIDI USB Class driver.
  40  *
  41  *  @{
  42  */
  43
  44 #ifndef __MIDI_CLASS_HOST_H__
  45 #define __MIDI_CLASS_HOST_H__
  46
  47         /* Includes: */
  48                 #include "../../USB.h"
  49                 #include "../Common/MIDI.h"
  50
  51         /* Enable C linkage for C++ Compilers: */
  52                 #if defined(__cplusplus)
  53                         extern "C" {
  54                 #endif
  55
  56         /* Public Interface - May be used in end-application: */
  57                 /* Type Defines: */
  58                         /** Class state structure. An instance of this structure should be made within the user application,
  59                          *  and passed to each of the MIDI class driver functions as the MIDIInterfaceInfo parameter. This
  60                          *  stores each MIDI interface's configuration and state information.
  61                          */
  62                         typedef struct
  63                         {
  64                                 const struct
  65                                 {
  66                                         uint8_t  DataINPipeNumber; /**< Pipe number of the MIDI interface's streaming IN data pipe */
  67                                         uint8_t  DataOUTPipeNumber; /**< Pipe number of the MIDI interface's streaming OUT data pipe */
  68                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  69                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  70                                            */
  71                                 struct
  72                                 {
  73                                         bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
  74                                                         *   after \ref MIDI_Host_ConfigurePipes() is called and the Host state machine is in the
  75                                                         *   Configured state
  76                                                         */
  77
  78                                         uint16_t DataINPipeSize; /**< Size in bytes of the MIDI Streaming Data interface's IN data pipe */
  79                                         uint16_t DataOUTPipeSize;  /**< Size in bytes of the MIDI Streaming Data interface's OUT data pipe */
  80                                 } State; /**< State data for the USB class interface within the device. All elements in this section
  81                                                   *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
  82                                                   *   the interface is enumerated.
  83                                                   */
  84                         } USB_ClassInfo_MIDI_Host_t;
  85
  86                 /* Enums: */
  87                         /** Enum for the possible error codes returned by the \ref MIDI_Host_ConfigurePipes() function. */
  88                         enum MIDIHost_EnumerationFailure_ErrorCodes_t
  89                         {
  90                                 MIDI_ENUMERROR_NoError                    = 0, /**< Configuration Descriptor was processed successfully */
  91                                 MIDI_ENUMERROR_InvalidConfigDescriptor    = 1, /**< The device returned an invalid Configuration Descriptor */
  92                                 MIDI_ENUMERROR_NoStreamingInterfaceFound  = 2, /**< A compatible MIDI interface was not found in the device's Configuration Descriptor */
  93                                 MIDI_ENUMERROR_EndpointsNotFound          = 3, /**< Compatible MIDI data endpoints were not found in the device's MIDI interface */
  94                         };
  95
  96                 /* Function Prototypes: */
  97                         /** General management task for a given MIDI host class interface, required for the correct operation of the interface. This should
  98                          *  be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
  99                          *
 100                          *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing an MIDI Class host configuration and state
 101                          */
 102                         void MIDI_Host_USBTask(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 103
 104                         /** Host interface configuration routine, to configure a given MIDI host interface instance using the Configuration
 105                          *  Descriptor read from an attached USB device. This function automatically updates the given MIDI Host instance's
 106                          *  state values and configures the pipes required to communicate with the interface if it is found within the device.
 107                          *  This should be called once after the stack has enumerated the attached device, while the host state machine is in
 108                          *  the Addressed state.
 109                          *
 110                          *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing an MIDI Class host configuration and state
 111                          *  \param[in] ConfigDescriptorSize  Length of the attached device's Configuration Descriptor
 112                          *  \param[in] DeviceConfigDescriptor  Pointer to a buffer containing the attached device's Configuration Descriptor
 113                          *
 114                          *  \return A value from the \ref MIDIHost_EnumerationFailure_ErrorCodes_t enum
 115                          */
 116                         uint8_t MIDI_Host_ConfigurePipes(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo, uint16_t ConfigDescriptorSize,
 117                                                          uint8_t* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1, 3);
 118
 119                         /** Sends a MIDI event packet to the device. If no device is connected, the event packet is discarded.
 120                          *
 121                          *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state
 122                          *  \param[in] Event  Pointer to a populated USB_MIDI_EventPacket_t structure containing the MIDI event to send
 123                          *
 124                          *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum
 125                          */
 126                         uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
 127                                                           MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1, 2);
 128
 129                         /** Receives a MIDI event packet from the device.
 130                          *
 131                          *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state
 132                          *  \param[out] Event  Pointer to a USB_MIDI_EventPacket_t structure where the received MIDI event is to be placed
 133                          *
 134                          *  \return Boolean true if a MIDI event packet was received, false otherwise
 135                          */
 136                         bool MIDI_Host_ReceiveEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
 137                                                           MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1, 2);
 138
 139         /* Private Interface - For use in library only: */
 140         #if !defined(__DOXYGEN__)
 141                 /* Macros: */
 142                         #define MIDI_STREAMING_CLASS           0x01
 143                         #define MIDI_STREAMING_SUBCLASS        0x03
 144                         #define MIDI_STREAMING_PROTOCOL        0x00
 145
 146                         #define MIDI_FOUND_DATAPIPE_IN           (1 << 0)
 147                         #define MIDI_FOUND_DATAPIPE_OUT          (1 << 1)
 148
 149                 /* Function Prototypes: */
 150                         #if defined(INCLUDE_FROM_MIDI_CLASS_HOST_C)
 151                                 static uint8_t DComp_MIDI_Host_NextMIDIStreamingInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
 152                                 static uint8_t DComp_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
 153                         #endif
 154         #endif
 155
 156         /* Disable C linkage for C++ Compilers: */
 157                 #if defined(__cplusplus)
 158                         }
 159                 #endif
 160
 161 #endif
 162
 163 /** @} */