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206 lines
8.2 KiB
206 lines
8.2 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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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 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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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#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 <util/atomic.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "../../../Scheduler/Scheduler.h"
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#include "../LowLevel/LowLevel.h"
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#include "USBMode.h"
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#include "Events.h"
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#include "StdDescriptors.h"
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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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/* 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 connected to a host if in device mode, or to a
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* device while running in host mode.
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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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* \note For the smaller USB AVRs (AT90USBXX2) with limited USB controllers, VBUS is not available to the USB controller.
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* this means that the current connection state is derived from the bus suspension and wake up events by default,
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* which is not always accurate (host may suspend the bus while still connected). If the actual connection state
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* needs to be determined, VBUS should be routed to an external pin, and the auto-detect behaviour turned off by
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* passing the NO_LIMITED_CONTROLLER_CONNECT token to the compiler via the -D switch at compile time. The connection
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* and disconnection events may be manually fired by RAISE_EVENT(), and the USB_IsConnected global changed manually.
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*
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* \ingroup Group_USBManagement
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*/
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extern volatile bool USB_IsConnected;
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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 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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#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
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/** Indicates if the USB interface is currently suspended by the host when in device mode. When suspended,
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* the device should consume minimal power, and cannot communicate to the host. If Remote Wakeup is
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* supported by the device and USB_RemoteWakeupEnabled is true, suspension can be terminated by the device
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* by issuing a Remote Wakeup request.
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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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*
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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_Device
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*/
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extern volatile bool USB_IsSuspended;
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#endif
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#if defined(USB_CAN_BE_HOST) || 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 USB_Host_States_t enum values in Host.h.
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*
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* This value may be altered by the user application to implement the HOST_STATE_Addressed,
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* HOST_STATE_Configured, HOST_STATE_Ready and HOST_STATE_Suspended states which are not implemented
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* by the library.
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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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* \ingroup Group_Host
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*/
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extern volatile uint8_t USB_HostState;
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#endif
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/* Throwable Events: */
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#if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
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/** This module raises the USB Connect event when a USB device has been connected whilst in host
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* mode, but not yet enumerated.
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*
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* \see Events.h for more information on this event.
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*/
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RAISES_EVENT(USB_Connect);
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/** This module raises the USB Device Attached event when in host mode, and a device is attached
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* to the AVR's USB interface.
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*
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* \see Events.h for more information on this event.
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*/
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RAISES_EVENT(USB_DeviceAttached);
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/** This module raises the USB Device Unattached event when in host mode, and a device is removed
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* from the AVR's USB interface.
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*
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* \see Events.h for more information on this event.
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*/
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RAISES_EVENT(USB_DeviceUnattached);
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/** This module raises the USB Device Enumeration Failed event when in host mode, and an
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* attached USB device has failed to successfully enumerated.
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*
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* \see Events.h for more information on this event.
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*/
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RAISES_EVENT(USB_DeviceEnumerationFailed);
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/** This module raises the USB Device Enumeration Complete event when in host mode, and an
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* attached USB device has been successfully enumerated and ready to be used by the user
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* application.
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*
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* \see Events.h for more information on this event.
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*/
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RAISES_EVENT(USB_DeviceEnumerationComplete);
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/** This module raises the USB Disconnect event when an attached USB device is removed from the USB
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* bus.
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*
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* \see Events.h for more information on this event.
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*/
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RAISES_EVENT(USB_Disconnect);
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#endif
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/* Tasks: */
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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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* scheduler (e.g. the simple LUFA Scheduler), fast timer ISR or the main user application loop.
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*
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* The USB task must be serviced within 50mS in all modes, when needed. The task may be serviced
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* 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 USB_Connect event
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* and disabled again on the firing of the USB_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 USB_DeviceAttached
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* event and disabled again on the firing of the USB_DeviceUnattached event.
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*
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* \see Events.h 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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TASK(USB_USBTask);
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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) {USB_HostState = HOST_STATE_WaitForDevice; WaitMSRemaining = duration; PostWaitState = nextstate; }
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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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