314 lines
18 KiB
C
314 lines
18 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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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 2017 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 Android Open Accessory Class driver.
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*
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* Host mode driver for the library USB Android Open Accessory 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_USBClassAOA
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* \defgroup Group_USBClassAndroidAccessoryHost Android Open Accessory Class Host Mode Driver
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*
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* \section Sec_USBClassAndroidAccessoryHost_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/AndroidAccessoryClassHost.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
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*
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* \section Sec_USBClassAndroidAccessoryHost_ModDescription Module Description
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* Host Mode USB Class driver framework interface, for the Android Open Accessory USB Class driver.
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*
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* @{
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*/
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#ifndef __AOA_CLASS_HOST_H__
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#define __AOA_CLASS_HOST_H__
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/* Includes: */
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#include "../../USB.h"
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#include "../Common/AndroidAccessoryClassCommon.h"
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#include <stdio.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_AOA_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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/* Macros: */
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/** Error code for some Android Open Accessory Host functions, indicating a logical (and not hardware) error. */
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#define AOA_ERROR_LOGICAL_CMD_FAILED 0x80
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/* Type Defines: */
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/** \brief Android Open Accessory 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 Android Open Accessory class driver functions as the \c AOAInterfaceInfo
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* parameter. This stores each Android Open Accessory 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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char* PropertyStrings[AOA_STRING_TOTAL_STRINGS]; /**< Android Accessory property strings, sent to identify the accessory when the
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* Android device is switched into Open Accessory mode. */
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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 AOA_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 AOA 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_AOA_Host_t;
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/* Enums: */
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/** Enum for the possible error codes returned by the \ref AOA_Host_ConfigurePipes() function. */
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enum AOA_Host_EnumerationFailure_ErrorCodes_t
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{
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AOA_ENUMERROR_NoError = 0, /**< Configuration Descriptor was processed successfully. */
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AOA_ENUMERROR_InvalidConfigDescriptor = 1, /**< The device returned an invalid Configuration Descriptor. */
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AOA_ENUMERROR_NoCompatibleInterfaceFound = 2, /**< A compatible Android Open Accessory interface was not found in the device's Configuration Descriptor. */
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AOA_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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/** General management task for a given Android Open Accessory host class interface, required for the correct operation of the interface.
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* This should 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] AOAInterfaceInfo Pointer to a structure containing an Android Open Accessory Class host configuration and state.
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*/
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void AOA_Host_USBTask(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Validates a device descriptor, to check if the device is a valid Android device, and if it is currently in Android Open Accessory mode.
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*
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* \param[in,out] AOAInterfaceInfo Pointer to a structure containing an AOA Class host configuration and state.
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* \param[in] DeviceDescriptor Pointer a buffer containing the attached device's Device Descriptor.
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* \param[out] NeedModeSwitch Pointer to a boolean where the mode switch requirement of the attached device is to be stored.
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*
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* \return Boolean \c true if the attached device is a valid Android device, \c false otherwise.
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*/
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bool AOA_Host_ValidateAccessoryDevice(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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const USB_Descriptor_Device_t* const DeviceDescriptor,
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bool* const NeedModeSwitch) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2) ATTR_NON_NULL_PTR_ARG(3);
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/** Host interface configuration routine, to configure a given Android Open Accessory host interface instance using the Configuration
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* Descriptor read from an attached USB device. This function automatically updates the given Android Open Accessory 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. This should be
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* called once after the stack has enumerated the attached device, while the host state machine is in the Addressed state.
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*
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* \param[in,out] AOAInterfaceInfo Pointer to a structure containing an AOA 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 AOA_Host_EnumerationFailure_ErrorCodes_t enum.
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*/
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uint8_t AOA_Host_ConfigurePipes(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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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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/** Starts Accessory Mode in the attached Android device. This function will validate the device's Android Open Accessory protocol
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* version, send the configured property strings, and request a switch to Android Open Accessory mode.
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*
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* \param[in,out] AOAInterfaceInfo Pointer to a structure containing an AOA Class host configuration and state.
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*
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* \return A value from the \ref USB_Host_SendControlErrorCodes_t enum, or \ref AOA_ERROR_LOGICAL_CMD_FAILED if a logical error occurred..
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*/
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uint8_t AOA_Host_StartAccessoryMode(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Sends a given data buffer to the attached USB device, if connected. If a device is not connected when the function is
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* called, the data will be discarded. Bytes will be queued for transmission to the device until either the pipe bank
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* becomes full, or the \ref AOA_Host_Flush() function is called to flush the pending data to the device. This allows for
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* multiple bytes to be packed into a single pipe packet, increasing data throughput.
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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] AOAInterfaceInfo Pointer to a structure containing a AOA Class host configuration and state.
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* \param[in] Buffer Pointer to a buffer containing the data to send to the device.
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* \param[in] Length Length of the data to send to the device.
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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 AOA_Host_SendData(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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const void* const Buffer,
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const uint16_t Length) ATTR_NON_NULL_PTR_ARG(1);
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/** Sends a given null-terminated string to the attached USB device, if connected. If a device is not connected when the
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* function is called, the string is discarded. Bytes will be queued for transmission to the device until either the pipe
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* bank becomes full, or the \ref AOA_Host_Flush() function is called to flush the pending data to the device. This allows
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* for multiple bytes to be packed into a single pipe packet, increasing data throughput.
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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] AOAInterfaceInfo Pointer to a structure containing a AOA Class host configuration and state.
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* \param[in] String Pointer to the null terminated string to send to the device.
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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 AOA_Host_SendString(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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const char* const String) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
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/** Sends a given byte to the attached USB device, if connected. If a device is not connected when the function is called, the
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* byte is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
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* \ref AOA_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be
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* packed into a single pipe packet, increasing data throughput.
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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] AOAInterfaceInfo Pointer to a structure containing a AOA Class host configuration and state.
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* \param[in] Data Byte of data to send to the device.
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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 AOA_Host_SendByte(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
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/** Determines the number of bytes received by the AOA interface from the device, waiting to be read. This indicates the number
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* of bytes in the IN pipe bank only, and thus the number of calls to \ref AOA_Host_ReceiveByte() which are guaranteed to succeed
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* immediately. If multiple bytes are to be received, they should be buffered by the user application, as the pipe bank will not be
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* released back to the USB controller until all bytes are read.
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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] AOAInterfaceInfo Pointer to a structure containing a AOA Class host configuration and state.
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*
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* \return Total number of buffered bytes received from the device.
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*/
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uint16_t AOA_Host_BytesReceived(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Reads a byte of data from the device. If no data is waiting to be read of if a USB device is not connected, the function
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* returns a negative value. The \ref AOA_Host_BytesReceived() function may be queried in advance to determine how many bytes
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* are currently buffered in the AOA interface's data receive pipe.
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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] AOAInterfaceInfo Pointer to a structure containing a AOA Class host configuration and state.
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*
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* \return Next received byte from the device, or a negative value if no data received.
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*/
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int16_t AOA_Host_ReceiveByte(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
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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] AOAInterfaceInfo Pointer to a structure containing a AOA Class host 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 AOA_Host_Flush(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Creates a standard character stream for the given AOA Device instance so that it can be used with all the regular
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* functions in the standard \c <stdio.h> library that accept a \c FILE stream as a destination (e.g. \c fprintf). The created
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* stream is bidirectional and can be used for both input and output functions.
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*
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* Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single
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* fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may
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* be used when the read data is processed byte-per-bye (via \c getc()) or when the user application will implement its own
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* line buffering.
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*
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* \note The created stream can be given as \c stdout if desired to direct the standard output from all \c <stdio.h> functions
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* to the given AOA interface.
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* \n\n
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*
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* \note This function is not available on all microcontroller architectures.
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*
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* \param[in,out] AOAInterfaceInfo Pointer to a structure containing a AOA Class configuration and state.
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* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed.
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*/
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void AOA_Host_CreateStream(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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FILE* const Stream) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
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/** Identical to \ref AOA_Host_CreateStream(), except that reads are blocking until the calling stream function terminates
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* the transfer. While blocking, the USB and AOA service tasks are called repeatedly to maintain USB communications.
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*
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* \note This function is not available on all microcontroller architectures.
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*
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* \param[in,out] AOAInterfaceInfo Pointer to a structure containing a AOA Class configuration and state.
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* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed.
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*/
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void AOA_Host_CreateBlockingStream(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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FILE* const Stream) 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_ANDROIDACCESSORY_HOST_C)
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#if defined(FDEV_SETUP_STREAM)
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static int AOA_Host_putchar(char c,
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FILE* Stream) ATTR_NON_NULL_PTR_ARG(2);
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static int AOA_Host_getchar(FILE* Stream) ATTR_NON_NULL_PTR_ARG(1);
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static int AOA_Host_getchar_Blocking(FILE* Stream) ATTR_NON_NULL_PTR_ARG(1);
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#endif
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static uint8_t AOA_Host_GetAccessoryProtocol(uint16_t* const Protocol) ATTR_NON_NULL_PTR_ARG(1);
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static uint8_t AOA_Host_SendPropertyString(USB_ClassInfo_AOA_Host_t* const AOAInterfaceInfo,
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const uint8_t StringIndex) ATTR_NON_NULL_PTR_ARG(1);
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static uint8_t DCOMP_AOA_Host_NextAndroidAccessoryInterface(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_AOA_Host_NextInterfaceBulkEndpoint(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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