204 lines
8.7 KiB
C
204 lines
8.7 KiB
C
/*
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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 Main USB service task management.
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*
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* This file contains the function definitions required for the main USB service task, which must be called
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* from the user application to ensure that the USB connection to or from a connected USB device is maintained.
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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 driver
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* dispatch header located in LUFA/Drivers/USB/USB.h.
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*/
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#ifndef __USBTASK_H__
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#define __USBTASK_H__
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/* Includes: */
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <stdbool.h>
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#include "../LowLevel/LowLevel.h"
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#include "Events.h"
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#include "StdRequestType.h"
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#include "StdDescriptors.h"
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#include "USBMode.h"
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#if defined(USB_CAN_BE_DEVICE)
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#include "../LowLevel/DevChapter9.h"
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#endif
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#if defined(USB_CAN_BE_HOST)
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#include "../LowLevel/HostChapter9.h"
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#endif
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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_USB_DRIVER)
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#error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
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#endif
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/* Public Interface - May be used in end-application: */
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/* Global Variables: */
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/** Indicates if the USB interface is currently initialized but not necessarily connected to a host
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* or device (i.e. if \ref USB_Init() has been run). If this is false, all other library globals are invalid.
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*
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* \note This variable should be treated as read-only in the user application, and never manually
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* changed in value.
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*
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* \ingroup Group_USBManagement
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*/
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extern volatile bool USB_IsInitialized;
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/** Structure containing the last received Control request when in Device mode (for use in user-applications
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* inside of the \ref EVENT_USB_Device_UnhandledControlRequest() event, or for filling up with a control request to issue when
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* in Host mode before calling \ref USB_Host_SendControlRequest().
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*
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* \ingroup Group_USBManagement
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*/
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extern USB_Request_Header_t USB_ControlRequest;
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#if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
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#if !defined(HOST_STATE_AS_GPIOR) || defined(__DOXYGEN__)
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/** Indicates the current host state machine state. When in host mode, this indicates the state
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* via one of the values of the \ref USB_Host_States_t enum values.
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*
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* This value may be altered by the user application to implement the \ref HOST_STATE_Addressed,
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* \ref HOST_STATE_Configured and \ref HOST_STATE_Suspended states which are not implemented by
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* the library.
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*
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* To reduce program size and speed up checks of this global, it can be placed into one of the AVR's
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* GPIOR hardware registers instead of RAM by defining the HOST_STATE_AS_GPIOR token to a value
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* between 0 and 2 in the project makefile and passing it to the compiler via the -D switch. When
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* defined, the corresponding GPIOR register should not be used in the user application except
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* implicitly via the library APIs.
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*
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* \note This global is only present if the user application can be a USB host.
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*
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* \see \ref USB_Host_States_t for a list of possible device states.
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*
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* \ingroup Group_Host
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*/
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extern volatile uint8_t USB_HostState;
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#else
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#define _GET_HOST_GPIOR_NAME2(y) GPIOR ## y
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#define _GET_HOST_GPIOR_NAME(x) _GET_HOST_GPIOR_NAME2(x)
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#define USB_HostState _GET_HOST_GPIOR_NAME(HOST_STATE_AS_GPIOR)
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#endif
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#endif
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#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
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#if !defined(DEVICE_STATE_AS_GPIOR) || defined(__DOXYGEN__)
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/** Indicates the current device state machine state. When in device mode, this indicates the state
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* via one of the values of the \ref USB_Device_States_t enum values.
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*
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* This value should not be altered by the user application as it is handled automatically by the
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* library. The only exception to this rule is if the NO_LIMITED_CONTROLLER_CONNECT token is used
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* (see \ref EVENT_USB_Device_Connect() and \ref EVENT_USB_Device_Disconnect() events).
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*
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* To reduce program size and speed up checks of this global, it can be placed into one of the AVR's
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* GPIOR hardware registers instead of RAM by defining the DEVICE_STATE_AS_GPIOR token to a value
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* between 0 and 2 in the project makefile and passing it to the compiler via the -D switch. When
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* defined, the corresponding GPIOR register should not be used in the user application except
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* implicitly via the library APIs.
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*
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* \note This global is only present if the user application can be a USB device.
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* \n\n
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*
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* \note This variable should be treated as read-only in the user application, and never manually
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* changed in value except in the circumstances outlined above.
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*
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* \see \ref USB_Device_States_t for a list of possible device states.
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*
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* \ingroup Group_Device
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*/
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extern volatile uint8_t USB_DeviceState;
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#else
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#define _GET_DEVICE_GPIOR_NAME2(y) GPIOR ## y
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#define _GET_DEVICE_GPIOR_NAME(x) _GET_DEVICE_GPIOR_NAME2(x)
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#define USB_DeviceState _GET_DEVICE_GPIOR_NAME(DEVICE_STATE_AS_GPIOR)
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#endif
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#endif
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/* Function Prototypes: */
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/** This is the main USB management task. The USB driver requires that this task be executed
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* continuously when the USB system is active (device attached in host mode, or attached to a host
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* in device mode) in order to manage USB communications. This task may be executed inside an RTOS,
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* fast timer ISR or the main user application loop.
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*
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* The USB task must be serviced within 30ms while in device mode, or within 1ms while in host mode.
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* The task may be serviced at all times, or (for minimum CPU consumption):
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*
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* - In device mode, it may be disabled at start-up, enabled on the firing of the \ref EVENT_USB_Device_Connect()
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* event and disabled again on the firing of the \ref EVENT_USB_Device_Disconnect() event.
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*
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* - In host mode, it may be disabled at start-up, enabled on the firing of the \ref EVENT_USB_Host_DeviceAttached()
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* event and disabled again on the firing of the \ref EVENT_USB_Host_DeviceEnumerationComplete() or
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* \ref EVENT_USB_Host_DeviceEnumerationFailed() events.
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*
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* If in device mode (only), the control endpoint can instead be managed via interrupts entirely by the library
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* by defining the INTERRUPT_CONTROL_ENDPOINT token and passing it to the compiler via the -D switch.
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*
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* \see \ref Group_Events for more information on the USB events.
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*
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* \ingroup Group_USBManagement
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*/
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void USB_USBTask(void);
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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_USBTASK_C)
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#if defined(USB_CAN_BE_HOST)
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static void USB_HostTask(void);
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#endif
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#if defined(USB_CAN_BE_DEVICE)
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static void USB_DeviceTask(void);
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#endif
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#endif
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/* Macros: */
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#define HOST_TASK_NONBLOCK_WAIT(duration, nextstate) MACROS{ USB_HostState = HOST_STATE_WaitForDevice; \
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WaitMSRemaining = (duration); \
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PostWaitState = (nextstate); }MACROE
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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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