qmk_firmware/LUFA/Drivers/USB/Class/Device/MIDIClassDevice.h

/*
             LUFA Library
     Copyright (C) Dean Camera, 2012.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2012  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 MIDI Class driver.
 *
 *  Device mode driver for the library USB MIDI 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_USBClassMIDI
 *  \defgroup Group_USBClassMIDIDevice MIDI 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/MIDIClassDevice.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
 *
 *  \section Sec_ModDescription Module Description
 *  Device Mode USB Class driver framework interface, for the MIDI USB Class driver.
 *
 *  @{
 */

#ifndef _MIDI_CLASS_DEVICE_H_
#define _MIDI_CLASS_DEVICE_H_

	/* Includes: */
		#include "../../USB.h"
		#include "../Common/MIDIClassCommon.h"

	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_MIDI_DRIVER)
			#error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
		#endif

	/* Public Interface - May be used in end-application: */
		/* Type Define: */
			/** \brief MIDI Class Device Mode Configuration and State Structure.
			 *
			 *  Class state structure. An instance of this structure should be made for each MIDI interface
			 *  within the user application, and passed to each of the MIDI class driver functions as the
			 *  \c MIDIInterfaceInfo parameter. This stores each MIDI interface's configuration and state information.
			 */
			typedef struct
			{
				struct
				{
					uint8_t  StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this structure controls. */

					uint8_t  DataINEndpointNumber; /**< Endpoint number of the incoming MIDI IN data, if available (zero if unused). */
					uint16_t DataINEndpointSize; /**< Size in bytes of the incoming MIDI IN data endpoint, if available (zero if unused). */
					bool     DataINEndpointDoubleBank; /**< Indicates if the MIDI interface's IN data endpoint should use double banking. */

					uint8_t  DataOUTEndpointNumber; /**< Endpoint number of the outgoing MIDI OUT data, if available (zero if unused). */
					uint16_t DataOUTEndpointSize; /**< Size in bytes of the outgoing MIDI OUT data endpoint, if available (zero if unused). */
					bool     DataOUTEndpointDoubleBank; /**< Indicates if the MIDI interface's OUT data endpoint should use double banking. */
				} 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
				{
					uint8_t RESERVED; // No state information for this class
				} 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_MIDI_Device_t;

		/* Function Prototypes: */
			/** Configures the endpoints of a given MIDI 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 MIDI interface is selected.
			 *
			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
			 *
			 *  \return Boolean \c true if the endpoints were successfully configured, \c false otherwise.
			 */
			bool MIDI_Device_ConfigureEndpoints(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

			/** General management task for a given MIDI 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] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
			 */
			void MIDI_Device_USBTask(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

			/** Sends a MIDI event packet to the host. If no host is connected, the event packet is discarded. Events are queued into the
			 *  endpoint bank until either the endpoint bank is full, or \ref MIDI_Device_Flush() is called. This allows for multiple
			 *  MIDI events to be packed into a single endpoint packet, increasing data throughput.
			 *
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
			 *       call will fail.
			 *
			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
			 *  \param[in]     Event              Pointer to a populated \ref MIDI_EventPacket_t structure containing the MIDI event to send.
			 *
			 *  \return A value from the \ref Endpoint_Stream_RW_ErrorCodes_t enum.
			 */
			uint8_t MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo,
			                                    const MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);


			/** Flushes the MIDI send buffer, sending any queued MIDI events to the host. This should be called to override the
			 *  \ref MIDI_Device_SendEventPacket() function's packing behaviour, to flush queued events.
			 *
			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
			 *
			 *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum.
			 */
			uint8_t MIDI_Device_Flush(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

			/** Receives a MIDI event packet from the host. Events are unpacked from the endpoint, thus if the endpoint bank contains
			 *  multiple MIDI events from the host in the one packet, multiple calls to this function will return each individual event.
			 *
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
			 *       call will fail.
			 *
			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
			 *  \param[out]    Event              Pointer to a USB_MIDI_EventPacket_t structure where the received MIDI event is to be placed.
			 *
			 *  \return Boolean \c true if a MIDI event packet was received, \c false otherwise.
			 */
			bool MIDI_Device_ReceiveEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo,
			                                    MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);

		/* Inline Functions: */
			/** Processes incoming control requests from the host, that are directed to the given MIDI class interface. This should be
			 *  linked to the library \ref EVENT_USB_Device_ControlRequest() event.
			 *
			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
			 */
			static inline void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
			static inline void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
			{
				(void)MIDIInterfaceInfo;
			}

	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif

#endif

/** @} */