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201 lines
9.7 KiB
201 lines
9.7 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 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 disclaim 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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* \note This file should not be included directly. It is automatically included as needed by the class driver
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* dispatch header located in LUFA/Drivers/USB/Class/MIDI.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_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/MIDI.c
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*
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* \section 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/MIDI.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/Class/MIDI.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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/** 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 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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const struct
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{
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uint8_t DataINPipeNumber; /**< Pipe number of the MIDI interface's streaming IN data pipe */
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bool DataINPipeDoubleBank; /** Indicates if the MIDI interface's IN data pipe should use double banking */
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uint8_t DataOUTPipeNumber; /**< Pipe number of the MIDI interface's streaming OUT data pipe */
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bool DataOUTPipeDoubleBank; /** Indicates if the MIDI interface's OUT data pipe should use double banking */
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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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uint16_t DataINPipeSize; /**< Size in bytes of the MIDI Streaming Data interface's IN data pipe */
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uint16_t DataOUTPipeSize; /**< Size in bytes of the MIDI Streaming Data interface's OUT data pipe */
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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 MIDIHost_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_NoStreamingInterfaceFound = 2, /**< A compatible MIDI interface was not found in the device's Configuration Descriptor */
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MIDI_ENUMERROR_EndpointsNotFound = 3, /**< Compatible MIDI data endpoints were not found in the device's MIDI interface */
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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] DeviceConfigDescriptor 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 MIDIHost_EnumerationFailure_ErrorCodes_t enum
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*/
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uint8_t MIDI_Host_ConfigurePipes(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo, uint16_t ConfigDescriptorSize,
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void* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);
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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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* \note This function must only be called when the Host state machine is in the 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 behaviour, 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);
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/** Receives a MIDI event packet from the device.
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*
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* \note This function must only be called when the Host state machine is in the 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 true if a MIDI event packet was received, 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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/* Inline Functions: */
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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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static inline void MIDI_Host_USBTask(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo);
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static inline void MIDI_Host_USBTask(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo)
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{
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(void)MIDIInterfaceInfo;
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}
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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/* Macros: */
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#define MIDI_STREAMING_CLASS 0x01
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#define MIDI_STREAMING_SUBCLASS 0x03
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#define MIDI_STREAMING_PROTOCOL 0x00
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#define MIDI_FOUND_DATAPIPE_IN (1 << 0)
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#define MIDI_FOUND_DATAPIPE_OUT (1 << 1)
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/* Function Prototypes: */
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#if defined(__INCLUDE_FROM_MIDI_CLASS_HOST_C)
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static uint8_t DComp_MIDI_Host_NextMIDIStreamingInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
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static uint8_t DComp_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const CurrentDescriptor) 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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