stddescriptors.h

LUFA (Lightweight USB Framework for AVRs) is my first foray into the world of USB. Originally based

/*
             LUFA Library
     Copyright (C) Dean Camera, 2009.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, and distribute this software
  and its documentation for any purpose and without fee is hereby
  granted, 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.
*/

/** \ingroup Group_USB
 *  @defgroup Group_Descriptors USB Descriptors
 *
 *  Standard USB device descriptor defines and retrieval routines, for USB devices. This module contains
 *  structures and macros for the easy creation of standard USB descriptors in USB device projects.
 *
 *  All standard descriptors have their elements named in an identical manner to the official USB specification,
 *  however slightly more verbose alternate (non-standard) names are also supplied if the macro
 *  USE_NONSTANDARD_DESCRIPTOR_NAMES is defined in the user project makefile and passed to the compiler at
 *  compilation time using the -D option.
 *
 *  The non-standard names are documented here - if USE_NONSTANDARD_DESCRIPTOR_NAMES is not defined, then all
 *  descriptors will contain elements named identically to the official USB specification. The alternately
 *  named descriptor elements are placed in the same order inside the descriptor structures as their officially
 *  named counterparts, thus they can be correlated easily with the official USB specification.
 *
 *  @{
 */
 
#ifndef __USBDESCRIPTORS_H__
#define __USBDESCRIPTORS_H__

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

		#include "../../../Common/Common.h"
		#include "USBMode.h"
		#include "Events.h"
		
		#if defined(USB_CAN_BE_DEVICE)
			#include "../LowLevel/Device.h"
		#endif

	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Public Interface - May be used in end-application: */
		/* Macros: */
			/** Indicates that a given descriptor does not exist in the device. This can be used inside descriptors
			 *  for string descriptor indexes, or may be use as a return value for GetDescriptor when the specified
			 *  descriptor does not exist.
			 */
			#define NO_DESCRIPTOR                     0
			
			/** Macro to calculate the power value for the device descriptor, from a given number of milliamps. */
			#define USB_CONFIG_POWER_MA(mA)            (mA >> 1)

			/** Macro to calculate the Unicode length of a string with a given number of Unicode characters.
			 *  Should be used in string descriptor's headers for giving the string descriptor's byte length.
			 */
			#define USB_STRING_LEN(str)               (sizeof(USB_Descriptor_Header_t) + (str << 1))
			
			/** Macro to encode a given four digit floating point version number (e.g. 01.23) into Binary Coded
			 *  Decimal format for descriptor fields requiring BCD encoding, such as the USB version number in the
			 *  standard device descriptor.
			 */
			#define VERSION_BCD(x)                    ((((VERSION_TENS(x) << 4) | VERSION_ONES(x)) << 8) | \
			                                          ((VERSION_TENTHS(x) << 4) | VERSION_HUNDREDTHS(x)))

			/** String language ID for the English language. Should be used in \ref USB_Descriptor_String_t descriptors
			 *  to indicate that the English language is supported by the device in its string descriptors.
			 */
			#define LANGUAGE_ID_ENG                   0x0409

			/** Can be masked with an endpoint address for a \ref USB_Descriptor_Endpoint_t endpoint descriptor's
			 *  EndpointAddress value to indicate to the host that the endpoint is of the IN direction (i.e, from
			 *  device to host).
			 */
			#define ENDPOINT_DESCRIPTOR_DIR_IN        0x80

			/** Can be masked with an endpoint address for a \ref USB_Descriptor_Endpoint_t endpoint descriptor's
			 *  EndpointAddress value to indicate to the host that the endpoint is of the OUT direction (i.e, from
			 *  host to device).
			 */
			#define ENDPOINT_DESCRIPTOR_DIR_OUT       0x00		

			/** Can be masked with other configuration descriptor attributes for a \ref USB_Descriptor_Configuration_Header_t
			 *  descriptor's ConfigAttributes value to indicate that the specified configuration can draw its power
			 *  from the host's VBUS line.
			 */
			#define USB_CONFIG_ATTR_BUSPOWERED        0x80

			/** Can be masked with other configuration descriptor attributes for a \ref USB_Descriptor_Configuration_Header_t
			 *  descriptor's ConfigAttributes value to indicate that the specified configuration can draw its power
			 *  from the device's own power source.
			 */
			#define USB_CONFIG_ATTR_SELFPOWERED       0xC0

			/** Can be masked with other configuration descriptor attributes for a \ref USB_Descriptor_Configuration_Header_t
			 *  descriptor's ConfigAttributes value to indicate that the specified configuration supports the
			 *  remote wakeup feature of the USB standard, allowing a suspended USB device to wake up the host upon
			 *  request.
			 */
			#define USB_CONFIG_ATTR_REMOTEWAKEUP      0xA0

			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is not synchronized.
			 *
			 *  \see The USB specification for more details on the possible Endpoint attributes.
			 */
			#define ENDPOINT_ATTR_NO_SYNC             (0 << 2)

			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is asynchronous.
			 *
			 *  \see The USB specification for more details on the possible Endpoint attributes.
			 */
			#define ENDPOINT_ATTR_ASYNC               (1 << 2)

			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is adaptive.
			 *
			 *  \see The USB specification for more details on the possible Endpoint attributes.
			 */
			#define ENDPOINT_ATTR_ADAPTIVE            (2 << 2)

			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is synchronized.
			 *
			 *  \see The USB specification for more details on the possible Endpoint attributes.
			 */
			#define ENDPOINT_ATTR_SYNC                (3 << 2)
			
			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is used for data transfers.
			 *
			 *  \see The USB specification for more details on the possible Endpoint usage attributes.
			 */
			#define ENDPOINT_USAGE_DATA               (0 << 4)

			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is used for feedback.
			 *
			 *  \see The USB specification for more details on the possible Endpoint usage attributes.
			 */
			#define ENDPOINT_USAGE_FEEDBACK           (1 << 4)

			/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
			 *  Attributes value to indicate that the specified endpoint is used for implicit feedback.
			 *
			 *  \see The USB specification for more details on the possible Endpoint usage attributes.
			 */
			#define ENDPOINT_USAGE_IMPLICIT_FEEDBACK  (2 << 4)

			/** Gives a void pointer to the specified descriptor (of any type). */
			#define DESCRIPTOR_ADDRESS(Descriptor)    ((void*)&Descriptor)

		/* Events: */
			#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
				/** This module raises the Device Error event while in device mode, if the \ref USB_GetDescriptor()
				 *  routine is not hooked in the user application to properly return descriptors to the library.
				 *
				 *  \see \ref Group_Events for more information on this event.
				 */
				RAISES_EVENT(USB_DeviceError);
			#endif
			
		/* Enums: */
			/** Enum for the possible standard descriptor types, as given in each descriptor's header. */
			enum USB_DescriptorTypes_t
			{
				DTYPE_Device               = 0x01, /**< Indicates that the descriptor is a device descriptor. */
				DTYPE_Configuration        = 0x02, /**< Indicates that the descriptor is a configuration descriptor. */
				DTYPE_String               = 0x03, /**< Indicates that the descriptor is a string descriptor. */
				DTYPE_Interface            = 0x04, /**< Indicates that the descriptor is an interface descriptor. */
				DTYPE_Endpoint             = 0x05, /**< Indicates that the descriptor is an endpoint descriptor. */
				DTYPE_DeviceQualifier      = 0x06, /**< Indicates that the descriptor is a device qualifier descriptor. */
				DTYPE_Other                = 0x07, /**< Indicates that the descriptor is of other type. */
				DTYPE_InterfacePower       = 0x08, /**< Indicates that the descriptor is an interface power descriptor. */
				DTYPE_InterfaceAssociation = 0x0B, /**< Indicates that the descriptor is an interface association descriptor. */
			};

		/* Type Defines: */
			/** Type define for all descriptor's header, indicating the descriptor's length and type.
			 *
			 *  \note The non-standard structure element names are documented here. If the
			 *        USE_NONSTANDARD_DESCRIPTOR_NAMES token is not set, this structure contains elements 
			 *        with names identical to those listed in the USB standard.
			 */
			typedef struct
			{
				#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)
				uint8_t Size; /**< Size of the descriptor, in bytes. */
				uint8_t Type; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
				               *   given by the specific class.
				               */
				#else
				uint8_t bLength;
				uint8_t bDescriptorType;
				#endif
			} USB_Descriptor_Header_t;
			
			/** Type define for a standard device descriptor.
			 *
			 *  \note The non-standard structure element names are documented here. If the
			 *        USE_NONSTANDARD_DESCRIPTOR_NAMES token is not set, this structure contains elements 
			 *        with names identical to those listed in the USB standard.
			 */
			typedef struct
			{
				#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)
				USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */

				uint16_t                USBSpecification; /**< BCD of the supported USB specification. */
				uint8_t                 Class; /**< USB device class. */
				uint8_t                 SubClass; /**< USB device subclass. */
				uint8_t                 Protocol; /**< USB device protocol. */
				
				uint8_t                 Endpoint0Size; /**< Size of the control (address 0) endpoint's bank in bytes. */
				
				uint16_t                VendorID; /**< Vendor ID for the USB product. */
				uint16_t                ProductID; /**< Unique product ID for the USB product. */
				uint16_t                ReleaseNumber; /**< Product release (version) number. */
				
				uint8_t                 ManufacturerStrIndex; /**< String index for the manufacturer's name. The
                                                               *   host will request this string via a separate
			                                                   *   control request for the string descriptor.
				                                               *
				                                               *   \note If no string supplied, use \ref NO_DESCRIPTOR.
				                                               */
				uint8_t                 ProductStrIndex; /**< String index for the product name/details.
				                                          *
				                                          *  \see ManufacturerStrIndex structure entry.
				                                          */
				uint8_t                 SerialNumStrIndex; /**< String index for the product's globally unique hexadecimal