StdRequestType.h 10.3 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 control endpoint request definitions.
 *
 *  This file contains structures and macros for the easy creation and parsing of standard USB control requests.
 *
 *  \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.
 */
 
/** \ingroup Group_USB
 *  @defgroup Group_StdRequest Standard USB Requests
 *
 *  This module contains definitions for the various control request parameters, so that the request
 *  details (such as data direction, request recipient, etc.) can be extracted via masking.
 *
 *  @{
 */

#ifndef __STDREQTYPE_H__
#define __STDREQTYPE_H__

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	/* Includes: */
		#include <stdint.h>

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	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_USB_DRIVER)
			#error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
		#endif
		
	/* Public Interface - May be used in end-application: */
		/* Macros: */
			/** Mask for the request type parameter, to indicate the direction of the request data (Host to Device
			 *  or Device to Host). The result of this mask should then be compared to the request direction masks.
			 *
			 *  \see REQDIR_* macros for masks indicating the request data direction.
			 */
			#define CONTROL_REQTYPE_DIRECTION  0x80

			/** Mask for the request type parameter, to indicate the type of request (Device, Class or Vendor
			 *  Specific). The result of this mask should then be compared to the request type masks.
			 *
			 *  \see REQTYPE_* macros for masks indicating the request type.
			 */
			#define CONTROL_REQTYPE_TYPE       0x60

			/** Mask for the request type parameter, to indicate the recipient of the request (Standard, Class
			 *  or Vendor Specific). The result of this mask should then be compared to the request recipient
			 *  masks.
			 *
			 *  \see REQREC_* macros for masks indicating the request recipient.
			 */
			#define CONTROL_REQTYPE_RECIPIENT  0x1F

			/** Request data direction mask, indicating that the request data will flow from host to device.
			 *
			 *  \see \ref CONTROL_REQTYPE_DIRECTION macro.
			 */
			#define REQDIR_HOSTTODEVICE        (0 << 7)

			/** Request data direction mask, indicating that the request data will flow from device to host.
			 *
			 *  \see \ref CONTROL_REQTYPE_DIRECTION macro.
			 */
			#define REQDIR_DEVICETOHOST        (1 << 7)

			/** Request type mask, indicating that the request is a standard request.
			 *
			 *  \see \ref CONTROL_REQTYPE_TYPE macro.
			 */
			#define REQTYPE_STANDARD           (0 << 5)

			/** Request type mask, indicating that the request is a class-specific request.
			 *
			 *  \see \ref CONTROL_REQTYPE_TYPE macro.
			 */
			#define REQTYPE_CLASS              (1 << 5)

			/** Request type mask, indicating that the request is a vendor specific request.
			 *
			 *  \see \ref CONTROL_REQTYPE_TYPE macro.
			 */
			#define REQTYPE_VENDOR             (2 << 5)

			/** Request recipient mask, indicating that the request is to be issued to the device as a whole.
			 *
			 *  \see \ref CONTROL_REQTYPE_RECIPIENT macro.
			 */
			#define REQREC_DEVICE              (0 << 0)

			/** Request recipient mask, indicating that the request is to be issued to an interface in the
			 *  currently selected configuration.
			 *
			 *  \see \ref CONTROL_REQTYPE_RECIPIENT macro.
			 */
			#define REQREC_INTERFACE           (1 << 0)

			/** Request recipient mask, indicating that the request is to be issued to an endpoint in the
			 *  currently selected configuration.
			 *
			 *  \see \ref CONTROL_REQTYPE_RECIPIENT macro.
			 */
			#define REQREC_ENDPOINT            (2 << 0)

			/** Request recipient mask, indicating that the request is to be issued to an unspecified element
			 *  in the currently selected configuration.
			 *
			 *  \see \ref CONTROL_REQTYPE_RECIPIENT macro.
			 */
			#define REQREC_OTHER               (3 << 0)
			
			/** Feature indicator for Clear Feature or Set Feature commands. When used in a Clear Feature
			 *  request this indicates that an endpoint (whose address is given elsewhere in the request
			 *  should have its stall condition cleared. If used in a similar manner inside a Set Feature
			 *  request, this stalls an endpoint.
			 */
			#define FEATURE_ENDPOINT_HALT           0x00

			/** Feature indicator for Clear Feature or Set Feature commands. When used in a Clear Feature
			 *  request this indicates that the remote wakeup enabled device should not issue remote
			 *  wakeup requests until further notice. If used in a similar manner inside a Set Feature
			 *  request, this re-enabled the remote wakeup feature on the device.
			 */
			#define FEATURE_REMOTE_WAKEUP           0x01

		/* Type Defines: */
			/** \brief Standard USB Control Request
			 *
			 *  Type define for a standard USB control request.
			 *
			 *  \see The USB 2.0 specification for more information on standard control requests.
			 */
			typedef struct
			{
				uint8_t  bmRequestType; /**< Type of the request. */
				uint8_t  bRequest; /**< Request command code. */
				uint16_t wValue; /**< wValue parameter of the request. */
				uint16_t wIndex; /**< wIndex parameter of the request. */
				uint16_t wLength; /**< Length of the data to transfer in bytes. */
			} USB_Request_Header_t;

		/* Enums: */
			/** Enumeration for the various standard request commands. These commands are applicable when the
			 *  request type is \ref REQTYPE_STANDARD (with the exception of \ref REQ_GetDescriptor, which is always
			 *  handled regardless of the request type value).
			 *
			 *  \see Chapter 9 of the USB 2.0 Specification.
			 */
			enum USB_Control_Request_t
			{
				REQ_GetStatus           = 0, /**< Implemented in the library for device, endpoint and interface
				                              *   recipients. Passed to the user application for other recipients
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_ClearFeature        = 1, /**< Implemented in the library for device, endpoint and interface
				                              *   recipients. Passed to the user application for other recipients
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_SetFeature          = 3, /**< Implemented in the library for device, endpoint and interface
				                              *   recipients. Passed to the user application for other recipients
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_SetAddress          = 5, /**< Implemented in the library for the device recipient. Passed
				                              *   to the user application for other recipients via the
				                              *   \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_GetDescriptor       = 6, /**< Implemented in the library for all recipients and all request
				                              *   types. */
				REQ_SetDescriptor       = 7, /**< Not implemented in the library, passed to the user application
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_GetConfiguration    = 8, /**< Implemented in the library for the device recipient. Passed
				                              *   to the user application for other recipients via the
				                              *   \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_SetConfiguration    = 9, /**< Implemented in the library for the device recipient. Passed
				                              *   to the user application for other recipients via the
				                              *   \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_GetInterface        = 10, /**< Not implemented in the library, passed to the user application
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_SetInterface        = 11, /**< Not implemented in the library, passed to the user application
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
				REQ_SynchFrame          = 12, /**< Not implemented in the library, passed to the user application
				                              *   via the \ref EVENT_USB_Device_UnhandledControlRequest() event when received in
				                              *   device mode. */
			};

	/* Private Interface - For use in library only: */
		#if !defined(__DOXYGEN__)
			/* Macros: */
				#define FEATURE_SELFPOWERED_ENABLED     (1 << 0)
				#define FEATURE_REMOTE_WAKEUP_ENABLED   (1 << 1)
		#endif

#endif

/** @} */