Endpoint.h 33.3 KB
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/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *  \brief USB device endpoint management definitions.
 *
 *  This file contains structures, function prototypes and macros related to the management of the device's
 *  data endpoints when the library is initialized in USB device mode.
 *
 *  \note This file should not be included directly. It is automatically included as needed by the USB driver
 *        dispatch header located in LUFA/Drivers/USB/USB.h.
 */

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/** \ingroup Group_EndpointManagement
 *  @defgroup Group_EndpointRW Endpoint Data Reading and Writing
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 *
 *  Functions, macros, variables, enums and types related to data reading and writing from and to endpoints.
 */
 
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/** \ingroup Group_EndpointRW
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 *  @defgroup Group_EndpointPrimitiveRW Read/Write of Primitive Data Types
 *
 *  Functions, macros, variables, enums and types related to data reading and writing of primitive data types
 *  from and to endpoints.
 */ 

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/** \ingroup Group_EndpointManagement
 *  @defgroup Group_EndpointPacketManagement Endpoint Packet Management
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 *
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 *  Functions, macros, variables, enums and types related to packet management of endpoints.
 */
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/** \ingroup Group_USB
 *  @defgroup Group_EndpointManagement Endpoint Management
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 *
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 *  Functions, macros and enums related to endpoint management when in USB Device mode. This
 *  module contains the endpoint management macros, as well as endpoint interrupt and data
 *  send/receive functions for various data types.
 *
 *  @{
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 */

#ifndef __ENDPOINT_H__
#define __ENDPOINT_H__

	/* Includes: */
		#include <avr/io.h>
		#include <stdbool.h>

		#include "../../../Common/Common.h"
		#include "../HighLevel/USBTask.h"
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		#include "USBInterrupt.h"
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	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_USB_DRIVER)
			#error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
		#endif
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	/* Private Interface - For use in library only: */
	#if !defined(__DOXYGEN__)
		/* Macros: */
			#define _ENDPOINT_GET_MAXSIZE(EPIndex)         _ENDPOINT_GET_MAXSIZE2(ENDPOINT_DETAILS_EP ## EPIndex)
			#define _ENDPOINT_GET_MAXSIZE2(EPDetails)      _ENDPOINT_GET_MAXSIZE3(EPDetails)
			#define _ENDPOINT_GET_MAXSIZE3(MaxSize, DB)    (MaxSize)

			#define _ENDPOINT_GET_DOUBLEBANK(EPIndex)      _ENDPOINT_GET_DOUBLEBANK2(ENDPOINT_DETAILS_EP ## EPIndex)
			#define _ENDPOINT_GET_DOUBLEBANK2(EPDetails)   _ENDPOINT_GET_DOUBLEBANK3(EPDetails)
			#define _ENDPOINT_GET_DOUBLEBANK3(MaxSize, DB) (DB)
			
			#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
				#define ENDPOINT_DETAILS_EP0               64,  true
				#define ENDPOINT_DETAILS_EP1               256, true
				#define ENDPOINT_DETAILS_EP2               64,  true
				#define ENDPOINT_DETAILS_EP3               64,  true
				#define ENDPOINT_DETAILS_EP4               64,  true
				#define ENDPOINT_DETAILS_EP5               64,  true
				#define ENDPOINT_DETAILS_EP6               64,  true
			#else
				#define ENDPOINT_DETAILS_EP0               64,  true
				#define ENDPOINT_DETAILS_EP1               64,  false
				#define ENDPOINT_DETAILS_EP2               64,  false
				#define ENDPOINT_DETAILS_EP3               64,  true
				#define ENDPOINT_DETAILS_EP4               64,  true			
			#endif

		/* Inline Functions: */
			static inline uint8_t Endpoint_BytesToEPSizeMask(const uint16_t Bytes) ATTR_WARN_UNUSED_RESULT ATTR_CONST
			                                                                       ATTR_ALWAYS_INLINE;
			static inline uint8_t Endpoint_BytesToEPSizeMask(const uint16_t Bytes)
			{
				uint8_t  MaskVal    = 0;
				uint16_t CheckBytes = 8;
				
				while (CheckBytes < Bytes)
				{
					MaskVal++;
					CheckBytes <<= 1;
				}
				
				return (MaskVal << EPSIZE0);
			}

		/* Function Prototypes: */
			void Endpoint_ClearEndpoints(void);
			bool Endpoint_ConfigureEndpoint_Prv(const uint8_t Number,
			                                    const uint8_t UECFG0XData,
			                                    const uint8_t UECFG1XData);

	#endif
	
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	/* Public Interface - May be used in end-application: */
		/* Macros: */
			/** Endpoint data direction mask for \ref Endpoint_ConfigureEndpoint(). This indicates that the endpoint
			 *  should be initialized in the OUT direction - i.e. data flows from host to device.
			 */
			#define ENDPOINT_DIR_OUT                      (0 << EPDIR)

			/** Endpoint data direction mask for \ref Endpoint_ConfigureEndpoint(). This indicates that the endpoint
			 *  should be initialized in the IN direction - i.e. data flows from device to host.
			 */
			#define ENDPOINT_DIR_IN                       (1 << EPDIR)

			/** Mask for the bank mode selection for the \ref Endpoint_ConfigureEndpoint() macro. This indicates
			 *  that the endpoint should have one single bank, which requires less USB FIFO memory but results
			 *  in slower transfers as only one USB device (the AVR or the host) can access the endpoint's
			 *  bank at the one time.
			 */
			#define ENDPOINT_BANK_SINGLE                  (0 << EPBK0)

			/** Mask for the bank mode selection for the \ref Endpoint_ConfigureEndpoint() macro. This indicates
			 *  that the endpoint should have two banks, which requires more USB FIFO memory but results
			 *  in faster transfers as one USB device (the AVR or the host) can access one bank while the other
			 *  accesses the second bank.
			 */
			#define ENDPOINT_BANK_DOUBLE                  (1 << EPBK0)
			
			/** Endpoint address for the default control endpoint, which always resides in address 0. This is
			 *  defined for convenience to give more readable code when used with the endpoint macros.
			 */
			#define ENDPOINT_CONTROLEP                    0

			#if (!defined(FIXED_CONTROL_ENDPOINT_SIZE) || defined(__DOXYGEN__))
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				/** Default size of the default control endpoint's bank, until altered by the control endpoint bank size 
				 *  value in the device descriptor. Not available if the FIXED_CONTROL_ENDPOINT_SIZE token is defined.
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				 */
				#define ENDPOINT_CONTROLEP_DEFAULT_SIZE   8
			#endif
			
			/** Endpoint number mask, for masking against endpoint addresses to retrieve the endpoint's
			 *  numerical address in the device.
			 */
			#define ENDPOINT_EPNUM_MASK                   0x07

			/** Endpoint direction mask, for masking against endpoint addresses to retrieve the endpoint's
			 *  direction for comparing with the ENDPOINT_DESCRIPTOR_DIR_* masks.
			 */
			#define ENDPOINT_EPDIR_MASK                   0x80

			/** Endpoint bank size mask, for masking against endpoint addresses to retrieve the endpoint's
			 *  bank size in the device.
			 */
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			#define ENDPOINT_EPSIZE_MASK                  0x7F
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			/** Maximum size in bytes of a given endpoint.
			 *
			 *  \param[in] n  Endpoint number, a value between 0 and (ENDPOINT_TOTAL_ENDPOINTS - 1)
			 */				
			#define ENDPOINT_MAX_SIZE(n)                  _ENDPOINT_GET_MAXSIZE(n)

			/** Indicates if the given endpoint supports double banking.
			 *
			 *  \param[in] n  Endpoint number, a value between 0 and (ENDPOINT_TOTAL_ENDPOINTS - 1)
			 */				
			#define ENDPOINT_DOUBLEBANK_SUPPORTED(n)      _ENDPOINT_GET_DOUBLEBANK(n)

			#if !defined(CONTROL_ONLY_DEVICE)
				#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR) || defined(__DOXYGEN__)
					/** Total number of endpoints (including the default control endpoint at address 0) which may
					 *  be used in the device. Different USB AVR models support different amounts of endpoints,
					 *  this value reflects the maximum number of endpoints for the currently selected AVR model.
					 */
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					#define ENDPOINT_TOTAL_ENDPOINTS      7
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				#else
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					#define ENDPOINT_TOTAL_ENDPOINTS      5
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				#endif
			#else
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				#define ENDPOINT_TOTAL_ENDPOINTS          1
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			#endif

		/* Enums: */
			/** Enum for the possible error return codes of the \ref Endpoint_WaitUntilReady() function.
			 *
			 *  \ingroup Group_EndpointRW
			 */
			enum Endpoint_WaitUntilReady_ErrorCodes_t
			{
				ENDPOINT_READYWAIT_NoError                 = 0, /**< Endpoint is ready for next packet, no error. */
				ENDPOINT_READYWAIT_EndpointStalled         = 1, /**< The endpoint was stalled during the stream
				                                                 *   transfer by the host or device.
				                                                 */
				ENDPOINT_READYWAIT_DeviceDisconnected      = 2,	/**< Device was disconnected from the host while
				                                                 *   waiting for the endpoint to become ready.
				                                                 */
				ENDPOINT_READYWAIT_BusSuspended            = 3, /**< The USB bus has been suspended by the host and
				                                                 *   no USB endpoint traffic can occur until the bus
				                                                 *   has resumed.
				                                                 */
				ENDPOINT_READYWAIT_Timeout                 = 4, /**< The host failed to accept or send the next packet
				                                                 *   within the software timeout period set by the
				                                                 *   \ref USB_STREAM_TIMEOUT_MS macro.
				                                                 */
			};

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		/* Inline Functions: */			
			/** Configures the specified endpoint number with the given endpoint type, direction, bank size
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			 *  and banking mode. Once configured, the endpoint may be read from or written to, depending
			 *  on its direction.
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			 *
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			 *  \param[in] Number     Endpoint number to configure. This must be more than 0 and less than
			 *                        \ref ENDPOINT_TOTAL_ENDPOINTS.
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			 *
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			 *  \param[in] Type       Type of endpoint to configure, a EP_TYPE_* mask. Not all endpoint types
			 *                        are available on Low Speed USB devices - refer to the USB 2.0 specification.
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			 *
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			 *  \param[in] Direction  Endpoint data direction, either \ref ENDPOINT_DIR_OUT or \ref ENDPOINT_DIR_IN.
			 *                        All endpoints (except Control type) are unidirectional - data may only be read
			 *                        from or written to the endpoint bank based on its direction, not both.
			 *
			 *  \param[in] Size       Size of the endpoint's bank, where packets are stored before they are transmitted
			 *                        to the USB host, or after they have been received from the USB host (depending on
			 *                        the endpoint's data direction). The bank size must indicate the maximum packet size
			 *                        that the endpoint can handle.
			 *
			 *  \param[in] Banks      Number of banks to use for the endpoint being configured, an ENDPOINT_BANK_* mask.
			 *                        More banks uses more USB DPRAM, but offers better performance. Isochronous type
			 *                        endpoints <b>must</b> have at least two banks.
			 *
			 *  \note Certain models of USB AVR's endpoints may have different maximum packet sizes based on the endpoint's
			 *        index - refer to the chosen USB AVR's datasheet to determine the maximum bank size for each endpoint.
			 *        \n\n
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			 *
			 *  \note The default control endpoint should not be manually configured by the user application, as 
			 *        it is automatically configured by the library internally.
			 *        \n\n
			 *
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			 *  \note This routine will automatically select the specified endpoint upon success. Upon failure, the endpoint
			 *        which failed to reconfigure correctly will be selected.
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			 *
			 *  \return Boolean true if the configuration succeeded, false otherwise.
			 */
			static inline bool Endpoint_ConfigureEndpoint(const uint8_t Number,
			                                              const uint8_t Type,
			                                              const uint8_t Direction,
			                                              const uint16_t Size,
			                                              const uint8_t Banks) ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_ConfigureEndpoint(const uint8_t Number,
			                                              const uint8_t Type,
			                                              const uint8_t Direction,
			                                              const uint16_t Size,
			                                              const uint8_t Banks)
			{
				return Endpoint_ConfigureEndpoint_Prv(Number, (((Type) << EPTYPE0) | (Direction)),
				                                      ((1 << ALLOC) | Banks | Endpoint_BytesToEPSizeMask(Size)));
			}

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			/** Indicates the number of bytes currently stored in the current endpoint's selected bank.
			 *
			 *  \note The return width of this function may differ, depending on the maximum endpoint bank size
			 *        of the selected AVR model.
			 *
			 *  \ingroup Group_EndpointRW
			 *
			 *  \return Total number of bytes in the currently selected Endpoint's FIFO buffer.
			 */
			static inline uint16_t Endpoint_BytesInEndpoint(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint16_t Endpoint_BytesInEndpoint(void)
			{
				#if defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
					return UEBCX;
				#elif defined(USB_SERIES_4_AVR)
					return (((uint16_t)UEBCHX << 8) | UEBCLX);
				#elif defined(USB_SERIES_2_AVR)
					return UEBCLX;
				#endif
			}
		
			/** Get the endpoint address of the currently selected endpoint. This is typically used to save
			 *  the currently selected endpoint number so that it can be restored after another endpoint has
			 *  been manipulated.
			 *
			 *  \return Index of the currently selected endpoint.
			 */
			static inline uint8_t Endpoint_GetCurrentEndpoint(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint8_t Endpoint_GetCurrentEndpoint(void)
			{
				#if !defined(CONTROL_ONLY_DEVICE)
					return (UENUM & ENDPOINT_EPNUM_MASK);
				#else
					return ENDPOINT_CONTROLEP;
				#endif
			}
			
			/** Selects the given endpoint number. If the address from the device descriptors is used, the
			 *  value should be masked with the \ref ENDPOINT_EPNUM_MASK constant to extract only the endpoint
			 *  number (and discarding the endpoint direction bit).
			 *
			 *  Any endpoint operations which do not require the endpoint number to be indicated will operate on
			 *  the currently selected endpoint.
			 *
			 *  \param[in] EndpointNumber Endpoint number to select.
			 */
			static inline void Endpoint_SelectEndpoint(const uint8_t EndpointNumber) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_SelectEndpoint(const uint8_t EndpointNumber)
			{
				#if !defined(CONTROL_ONLY_DEVICE)
					UENUM = EndpointNumber;
				#endif			
			}
			
			/** Resets the endpoint bank FIFO. This clears all the endpoint banks and resets the USB controller's
			 *  In and Out pointers to the bank's contents.
			 *
			 *  \param[in] EndpointNumber Endpoint number whose FIFO buffers are to be reset.
			 */
			static inline void Endpoint_ResetFIFO(const uint8_t EndpointNumber) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_ResetFIFO(const uint8_t EndpointNumber)
			{
				UERST = (1 << EndpointNumber);
				UERST = 0;
			}
			
			/** Enables the currently selected endpoint so that data can be sent and received through it to
			 *  and from a host.
			 *
			 *  \note Endpoints must first be configured properly via \ref Endpoint_ConfigureEndpoint().
			 */
			static inline void Endpoint_EnableEndpoint(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_EnableEndpoint(void)
			{
				UECONX |= (1 << EPEN);
			}

			/** Disables the currently selected endpoint so that data cannot be sent and received through it
			 *  to and from a host.
			 */
			static inline void Endpoint_DisableEndpoint(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_DisableEndpoint(void)
			{
				UECONX &= ~(1 << EPEN);
			}
			
			/** Determines if the currently selected endpoint is enabled, but not necessarily configured.
			 *
			 * \return Boolean True if the currently selected endpoint is enabled, false otherwise.
			 */
			static inline bool Endpoint_IsEnabled(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsEnabled(void)
			{
				return ((UECONX & (1 << EPEN)) ? true : false);
			}
			
			/** Determines if the currently selected endpoint may be read from (if data is waiting in the endpoint
			 *  bank and the endpoint is an OUT direction, or if the bank is not yet full if the endpoint is an IN
			 *  direction). This function will return false if an error has occurred in the endpoint, if the endpoint
			 *  is an OUT direction and no packet (or an empty packet) has been received, or if the endpoint is an IN
			 *  direction and the endpoint bank is full.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 *
			 *  \return Boolean true if the currently selected endpoint may be read from or written to, depending on its direction.
			 */
			static inline bool Endpoint_IsReadWriteAllowed(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsReadWriteAllowed(void)
			{
				return ((UEINTX & (1 << RWAL)) ? true : false);
			}
			
			/** Determines if the currently selected endpoint is configured.
			 *
			 *  \return Boolean true if the currently selected endpoint has been configured, false otherwise.
			 */
			static inline bool Endpoint_IsConfigured(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsConfigured(void)
			{
				return ((UESTA0X & (1 << CFGOK)) ? true : false);
			}
			
			/** Returns a mask indicating which INTERRUPT type endpoints have interrupted - i.e. their
			 *  interrupt duration has elapsed. Which endpoints have interrupted can be determined by
			 *  masking the return value against (1 << {Endpoint Number}).
			 *
			 *  \return Mask whose bits indicate which endpoints have interrupted.
			 */
			static inline uint8_t Endpoint_GetEndpointInterrupts(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint8_t Endpoint_GetEndpointInterrupts(void)
			{
				return UEINT;
			}
			
			/** Determines if the specified endpoint number has interrupted (valid only for INTERRUPT type
			 *  endpoints).
			 *
			 *  \param[in] EndpointNumber  Index of the endpoint whose interrupt flag should be tested.
			 *
			 *  \return Boolean true if the specified endpoint has interrupted, false otherwise.
			 */
			static inline bool Endpoint_HasEndpointInterrupted(const uint8_t EndpointNumber) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_HasEndpointInterrupted(const uint8_t EndpointNumber)
			{
				return ((UEINT & (1 << EndpointNumber)) ? true : false);
			}
			
			/** Determines if the selected IN endpoint is ready for a new packet.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 *
			 *  \return Boolean true if the current endpoint is ready for an IN packet, false otherwise.
			 */
			static inline bool Endpoint_IsINReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsINReady(void)
			{
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				return ((UEINTX & (1 << TXINI)) ? true : false);
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			}
			
			/** Determines if the selected OUT endpoint has received new packet.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 *
			 *  \return Boolean true if current endpoint is has received an OUT packet, false otherwise.
			 */
			static inline bool Endpoint_IsOUTReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsOUTReceived(void)
			{
				return ((UEINTX & (1 << RXOUTI)) ? true : false);
			}
			
			/** Determines if the current CONTROL type endpoint has received a SETUP packet.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 *
			 *  \return Boolean true if the selected endpoint has received a SETUP packet, false otherwise.
			 */
			static inline bool Endpoint_IsSETUPReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsSETUPReceived(void)
			{
				return ((UEINTX & (1 << RXSTPI)) ? true : false);
			}
			
			/** Clears a received SETUP packet on the currently selected CONTROL type endpoint, freeing up the
			 *  endpoint for the next packet.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 *
			 *  \note This is not applicable for non CONTROL type endpoints. 
			 */
			static inline void Endpoint_ClearSETUP(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_ClearSETUP(void)
			{
				UEINTX &= ~(1 << RXSTPI);
			}
			
			/** Sends an IN packet to the host on the currently selected endpoint, freeing up the endpoint for the
			 *  next packet and switching to the alternative endpoint bank if double banked.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 */
			static inline void Endpoint_ClearIN(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_ClearIN(void)
			{
				#if !defined(CONTROL_ONLY_DEVICE)
					UEINTX &= ~((1 << TXINI) | (1 << FIFOCON));
				#else
					UEINTX &= ~(1 << TXINI);
				#endif
			}
			
			/** Acknowledges an OUT packet to the host on the currently selected endpoint, freeing up the endpoint
			 *  for the next packet and switching to the alternative endpoint bank if double banked.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 */
			static inline void Endpoint_ClearOUT(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_ClearOUT(void)
			{
				#if !defined(CONTROL_ONLY_DEVICE)
					UEINTX &= ~((1 << RXOUTI) | (1 << FIFOCON));
				#else
					UEINTX &= ~(1 << RXOUTI);	
				#endif
			}
			
			/** Stalls the current endpoint, indicating to the host that a logical problem occurred with the
			 *  indicated endpoint and that the current transfer sequence should be aborted. This provides a
			 *  way for devices to indicate invalid commands to the host so that the current transfer can be
			 *  aborted and the host can begin its own recovery sequence.
			 *
			 *  The currently selected endpoint remains stalled until either the \ref Endpoint_ClearStall() macro
			 *  is called, or the host issues a CLEAR FEATURE request to the device for the currently selected
			 *  endpoint.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 */
			static inline void Endpoint_StallTransaction(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_StallTransaction(void)
			{
				UECONX |= (1 << STALLRQ);
			}
			
			/** Clears the STALL condition on the currently selected endpoint.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 */
			static inline void Endpoint_ClearStall(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_ClearStall(void)
			{
				UECONX |= (1 << STALLRQC);
			}
			
			/** Determines if the currently selected endpoint is stalled, false otherwise.
			 *
			 *  \ingroup Group_EndpointPacketManagement
			 *
			 *  \return Boolean true if the currently selected endpoint is stalled, false otherwise.
			 */
			static inline bool Endpoint_IsStalled(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool Endpoint_IsStalled(void)
			{
				return ((UECONX & (1 << STALLRQ)) ? true : false);
			}
			
			/** Resets the data toggle of the currently selected endpoint. */
			static inline void Endpoint_ResetDataToggle(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_ResetDataToggle(void)
			{
				UECONX |= (1 << RSTDT);
			}
			
			/** Determines the currently selected endpoint's direction.
			 *
			 *  \return The currently selected endpoint's direction, as a ENDPOINT_DIR_* mask.
			 */
			static inline uint8_t Endpoint_GetEndpointDirection(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint8_t Endpoint_GetEndpointDirection(void)
			{
				return (UECFG0X & ENDPOINT_DIR_IN);
			}

			/** Sets the direction of the currently selected endpoint.
			 *
			 *  \param[in] DirectionMask  New endpoint direction, as a ENDPOINT_DIR_* mask.
			 */
			static inline void Endpoint_SetEndpointDirection(const uint8_t DirectionMask) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_SetEndpointDirection(const uint8_t DirectionMask)
			{
				UECFG0X = ((UECFG0X & ~ENDPOINT_DIR_IN) | DirectionMask);
			}

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			/** Reads one byte from the currently selected endpoint's bank, for OUT direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \return Next byte in the currently selected endpoint's FIFO buffer.
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			 */
			static inline uint8_t Endpoint_Read_Byte(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint8_t Endpoint_Read_Byte(void)
			{
				return UEDATX;
			}

			/** Writes one byte from the currently selected endpoint's bank, for IN direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \param[in] Byte  Next byte to write into the the currently selected endpoint's FIFO buffer.
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			 */
			static inline void Endpoint_Write_Byte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Write_Byte(const uint8_t Byte)
			{
				UEDATX = Byte;
			}

			/** Discards one byte from the currently selected endpoint's bank, for OUT direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 */
			static inline void Endpoint_Discard_Byte(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Discard_Byte(void)
			{
				uint8_t Dummy;
				
				Dummy = UEDATX;
			}
			
			/** Reads two bytes from the currently selected endpoint's bank in little endian format, for OUT
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \return Next word in the currently selected endpoint's FIFO buffer.
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			 */
			static inline uint16_t Endpoint_Read_Word_LE(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint16_t Endpoint_Read_Word_LE(void)
			{
				union
				{
					uint16_t Word;
					uint8_t  Bytes[2];
				} Data;
				
				Data.Bytes[0] = UEDATX;
				Data.Bytes[1] = UEDATX;
			
				return Data.Word;
			}

			/** Reads two bytes from the currently selected endpoint's bank in big endian format, for OUT
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \return Next word in the currently selected endpoint's FIFO buffer.
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			 */
			static inline uint16_t Endpoint_Read_Word_BE(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint16_t Endpoint_Read_Word_BE(void)
			{
				union
				{
					uint16_t Word;
					uint8_t  Bytes[2];
				} Data;
				
				Data.Bytes[1] = UEDATX;
				Data.Bytes[0] = UEDATX;
			
				return Data.Word;
			}

			/** Writes two bytes to the currently selected endpoint's bank in little endian format, for IN
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \param[in] Word  Next word to write to the currently selected endpoint's FIFO buffer.
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			 */
			static inline void Endpoint_Write_Word_LE(const uint16_t Word) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Write_Word_LE(const uint16_t Word)
			{
				UEDATX = (Word & 0xFF);
				UEDATX = (Word >> 8);
			}
			
			/** Writes two bytes to the currently selected endpoint's bank in big endian format, for IN
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \param[in] Word  Next word to write to the currently selected endpoint's FIFO buffer.
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			 */
			static inline void Endpoint_Write_Word_BE(const uint16_t Word) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Write_Word_BE(const uint16_t Word)
			{
				UEDATX = (Word >> 8);
				UEDATX = (Word & 0xFF);
			}

			/** Discards two bytes from the currently selected endpoint's bank, for OUT direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 */
			static inline void Endpoint_Discard_Word(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Discard_Word(void)
			{
				uint8_t Dummy;
				
				Dummy = UEDATX;
				Dummy = UEDATX;
			}

			/** Reads four bytes from the currently selected endpoint's bank in little endian format, for OUT
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \return Next double word in the currently selected endpoint's FIFO buffer.
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			 */
			static inline uint32_t Endpoint_Read_DWord_LE(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint32_t Endpoint_Read_DWord_LE(void)
			{
				union
				{
					uint32_t DWord;
					uint8_t  Bytes[4];
				} Data;
				
				Data.Bytes[0] = UEDATX;
				Data.Bytes[1] = UEDATX;
				Data.Bytes[2] = UEDATX;
				Data.Bytes[3] = UEDATX;
			
				return Data.DWord;
			}

			/** Reads four bytes from the currently selected endpoint's bank in big endian format, for OUT
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \return Next double word in the currently selected endpoint's FIFO buffer.
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			 */
			static inline uint32_t Endpoint_Read_DWord_BE(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint32_t Endpoint_Read_DWord_BE(void)
			{
				union
				{
					uint32_t DWord;
					uint8_t  Bytes[4];
				} Data;
				
				Data.Bytes[3] = UEDATX;
				Data.Bytes[2] = UEDATX;
				Data.Bytes[1] = UEDATX;
				Data.Bytes[0] = UEDATX;
			
				return Data.DWord;
			}

			/** Writes four bytes to the currently selected endpoint's bank in little endian format, for IN
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \param[in] DWord  Next double word to write to the currently selected endpoint's FIFO buffer.
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			 */
			static inline void Endpoint_Write_DWord_LE(const uint32_t DWord) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Write_DWord_LE(const uint32_t DWord)
			{
				UEDATX = (DWord &  0xFF);
				UEDATX = (DWord >> 8);
				UEDATX = (DWord >> 16);
				UEDATX = (DWord >> 24);
			}
			
			/** Writes four bytes to the currently selected endpoint's bank in big endian format, for IN
			 *  direction endpoints.
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 *
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			 *  \param[in] DWord  Next double word to write to the currently selected endpoint's FIFO buffer.
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			 */
			static inline void Endpoint_Write_DWord_BE(const uint32_t DWord) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Write_DWord_BE(const uint32_t DWord)
			{
				UEDATX = (DWord >> 24);
				UEDATX = (DWord >> 16);
				UEDATX = (DWord >> 8);
				UEDATX = (DWord &  0xFF);
			}

			/** Discards four bytes from the currently selected endpoint's bank, for OUT direction endpoints.	
			 *
			 *  \ingroup Group_EndpointPrimitiveRW
			 */
			static inline void Endpoint_Discard_DWord(void) ATTR_ALWAYS_INLINE;
			static inline void Endpoint_Discard_DWord(void)
			{
				uint8_t Dummy;
				
				Dummy = UEDATX;
				Dummy = UEDATX;
				Dummy = UEDATX;
				Dummy = UEDATX;
			}

		/* External Variables: */
			/** Global indicating the maximum packet size of the default control endpoint located at address
			 *  0 in the device. This value is set to the value indicated in the device descriptor in the user
			 *  project once the USB interface is initialized into device mode.
			 *
			 *  If space is an issue, it is possible to fix this to a static value by defining the control
			 *  endpoint size in the FIXED_CONTROL_ENDPOINT_SIZE token passed to the compiler in the makefile
			 *  via the -D switch. When a fixed control endpoint size is used, the size is no longer dynamically
			 *  read from the descriptors at runtime and instead fixed to the given value. When used, it is
			 *  important that the descriptor control endpoint size value matches the size given as the
			 *  FIXED_CONTROL_ENDPOINT_SIZE token - it is recommended that the FIXED_CONTROL_ENDPOINT_SIZE token
			 *  be used in the descriptors to ensure this.
			 *
			 *  \note This variable should be treated as read-only in the user application, and never manually
			 *        changed in value.
			 */
			#if (!defined(FIXED_CONTROL_ENDPOINT_SIZE) || defined(__DOXYGEN__))
				extern uint8_t USB_ControlEndpointSize;
			#else
				#define USB_ControlEndpointSize FIXED_CONTROL_ENDPOINT_SIZE
			#endif

		/* Function Prototypes: */
			/** Completes the status stage of a control transfer on a CONTROL type endpoint automatically,
			 *  with respect to the data direction. This is a convenience function which can be used to
			 *  simplify user control request handling.
			 */
			void Endpoint_ClearStatusStage(void);

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			/** Spin-loops until the currently selected non-control endpoint is ready for the next packet of data
			 *  to be read or written to it.
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			 *
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			 *  \note This routine should not be called on CONTROL type endpoints.
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			 *
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			 *  \ingroup Group_EndpointRW
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			 *
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			 *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum.
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			 */
844
			uint8_t Endpoint_WaitUntilReady(void);
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	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif
		
#endif

/** @} */