191 lines
9.3 KiB
C
191 lines
9.3 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Host mode driver for the library USB MIDI Class driver.
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*
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* Host mode driver for the library USB MIDI Class driver.
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*
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* \note This file should not be included directly. It is automatically included as needed by the USB module driver
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* dispatch header located in LUFA/Drivers/USB.h.
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*/
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/** \ingroup Group_USBClassMIDI
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* \defgroup Group_USBClassMIDIHost MIDI Class Host Mode Driver
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*
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* \section Sec_USBClassMIDIHost_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - LUFA/Drivers/USB/Class/Host/MIDIClassHost.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
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*
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* \section Sec_USBClassMIDIHost_ModDescription Module Description
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* Host Mode USB Class driver framework interface, for the MIDI USB Class driver.
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*
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* @{
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*/
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#ifndef __MIDI_CLASS_HOST_H__
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#define __MIDI_CLASS_HOST_H__
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/* Includes: */
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#include "../../USB.h"
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#include "../Common/MIDIClassCommon.h"
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_MIDI_DRIVER)
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#error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
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#endif
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/* Public Interface - May be used in end-application: */
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/* Type Defines: */
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/** \brief MIDI Class Host Mode Configuration and State Structure.
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*
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* Class state structure. An instance of this structure should be made within the user application,
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* and passed to each of the MIDI class driver functions as the \c MIDIInterfaceInfo parameter. This
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* stores each MIDI interface's configuration and state information.
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*/
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typedef struct
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{
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struct
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{
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USB_Pipe_Table_t DataINPipe; /**< Data IN Pipe configuration table. */
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USB_Pipe_Table_t DataOUTPipe; /**< Data OUT Pipe configuration table. */
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} Config; /**< Config data for the USB class interface within the device. All elements in this section
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* <b>must</b> be set or the interface will fail to enumerate and operate correctly.
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*/
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struct
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{
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bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
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* after \ref MIDI_Host_ConfigurePipes() is called and the Host state machine is in the
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* Configured state.
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*/
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uint8_t InterfaceNumber; /**< Interface index of the MIDI interface within the attached device. */
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} State; /**< State data for the USB class interface within the device. All elements in this section
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* <b>may</b> be set to initial values, but may also be ignored to default to sane values when
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* the interface is enumerated.
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*/
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} USB_ClassInfo_MIDI_Host_t;
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/* Enums: */
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/** Enum for the possible error codes returned by the \ref MIDI_Host_ConfigurePipes() function. */
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enum MIDI_Host_EnumerationFailure_ErrorCodes_t
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{
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MIDI_ENUMERROR_NoError = 0, /**< Configuration Descriptor was processed successfully. */
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MIDI_ENUMERROR_InvalidConfigDescriptor = 1, /**< The device returned an invalid Configuration Descriptor. */
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MIDI_ENUMERROR_NoCompatibleInterfaceFound = 2, /**< A compatible MIDI interface was not found in the device's Configuration Descriptor. */
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MIDI_ENUMERROR_PipeConfigurationFailed = 3, /**< One or more pipes for the specified interface could not be configured correctly. */
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};
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/* Function Prototypes: */
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/** Host interface configuration routine, to configure a given MIDI host interface instance using the Configuration
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* Descriptor read from an attached USB device. This function automatically updates the given MIDI Host instance's
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* state values and configures the pipes required to communicate with the interface if it is found within the device.
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* This should be called once after the stack has enumerated the attached device, while the host state machine is in
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* the Addressed state.
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*
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* \param[in,out] MIDIInterfaceInfo Pointer to a structure containing an MIDI Class host configuration and state.
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* \param[in] ConfigDescriptorSize Length of the attached device's Configuration Descriptor.
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* \param[in] ConfigDescriptorData Pointer to a buffer containing the attached device's Configuration Descriptor.
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*
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* \return A value from the \ref MIDI_Host_EnumerationFailure_ErrorCodes_t enum.
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*/
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uint8_t MIDI_Host_ConfigurePipes(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
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uint16_t ConfigDescriptorSize,
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void* ConfigDescriptorData) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);
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/** General management task for a given MIDI host class interface, required for the correct operation of the interface. This should
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* be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
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*
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* \param[in,out] MIDIInterfaceInfo Pointer to a structure containing an MIDI Class host configuration and state.
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*/
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void MIDI_Host_USBTask(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Sends a MIDI event packet to the device. If no device is connected, the event packet is discarded.
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*
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* \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
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* call will fail.
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*
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* \param[in,out] MIDIInterfaceInfo Pointer to a structure containing a MIDI Class configuration and state.
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* \param[in] Event Pointer to a populated USB_MIDI_EventPacket_t structure containing the MIDI event to send.
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*
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* \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum.
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*/
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uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
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MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
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/** Flushes the MIDI send buffer, sending any queued MIDI events to the device. This should be called to override the
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* \ref MIDI_Host_SendEventPacket() function's packing behavior, to flush queued events. Events are queued into the
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* pipe bank until either the pipe bank is full, or \ref MIDI_Host_Flush() is called. This allows for multiple MIDI
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* events to be packed into a single pipe packet, increasing data throughput.
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*
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* \param[in,out] MIDIInterfaceInfo Pointer to a structure containing a MIDI Class configuration and state.
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*
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* \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum.
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*/
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uint8_t MIDI_Host_Flush(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Receives a MIDI event packet from the device.
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*
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* \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
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* call will fail.
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*
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* \param[in,out] MIDIInterfaceInfo Pointer to a structure containing a MIDI Class configuration and state.
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* \param[out] Event Pointer to a USB_MIDI_EventPacket_t structure where the received MIDI event is to be placed.
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*
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* \return Boolean \c true if a MIDI event packet was received, \c false otherwise.
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*/
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bool MIDI_Host_ReceiveEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
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MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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/* Function Prototypes: */
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#if defined(__INCLUDE_FROM_MIDI_HOST_C)
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static uint8_t DCOMP_MIDI_Host_NextMIDIStreamingInterface(void* const CurrentDescriptor)
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ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
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static uint8_t DCOMP_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const CurrentDescriptor)
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ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
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#endif
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#endif
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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