608 lines
33 KiB
C
608 lines
33 KiB
C
/*
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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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/** \ingroup Group_USB
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* @defgroup Group_Descriptors USB Descriptors
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*
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* Standard USB device descriptor defines and retrieval routines, for USB devices. This module contains
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* structures and macros for the easy creation of standard USB descriptors in USB device projects.
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*
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* @{
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*/
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#ifndef __USBDESCRIPTORS_H__
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#define __USBDESCRIPTORS_H__
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/* Includes: */
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#include <avr/pgmspace.h>
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#include <stdbool.h>
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#include "../../../Common/Common.h"
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#include "USBMode.h"
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#include "Events.h"
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#if defined(USB_CAN_BE_DEVICE)
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#include "../LowLevel/Device.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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/* Macros: */
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/** Indicates that a given descriptor does not exist in the device. This can be used inside descriptors
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* for string descriptor indexes, or may be use as a return value for GetDescriptor when the specified
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* descriptor does not exist.
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*/
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#define NO_DESCRIPTOR 0
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#if (!defined(NO_INTERNAL_SERIAL) && (defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR))) || defined(__DOXYGEN__)
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/** String descriptor index for the device's unique serial number string descriptor within the device.
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* This unique serial number is used by the host to associate resources to the device (such as drivers or COM port
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* number allocations) to a device regardless of the port it is plugged in to on the host. Some USB AVRs contain
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* a unique serial number internally, and setting the device descriptors serial number string index to this value
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* will cause it to use the internal serial number.
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*
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* On unsupported devices, this will evaluate to NO_DESCRIPTOR and so will force the host to create a pseudo-serial
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* number for the device.
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*/
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#define USE_INTERNAL_SERIAL 0xDC
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#else
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#define USE_INTERNAL_SERIAL NO_DESCRIPTOR
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#endif
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/** Macro to calculate the power value for the device descriptor, from a given number of milliamps. */
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#define USB_CONFIG_POWER_MA(mA) (mA >> 1)
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/** Macro to calculate the Unicode length of a string with a given number of Unicode characters.
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* Should be used in string descriptor's headers for giving the string descriptor's byte length.
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*/
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#define USB_STRING_LEN(str) (sizeof(USB_Descriptor_Header_t) + (str << 1))
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/** Macro to encode a given four digit floating point version number (e.g. 01.23) into Binary Coded
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* Decimal format for descriptor fields requiring BCD encoding, such as the USB version number in the
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* standard device descriptor.
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*/
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#define VERSION_BCD(x) ((((VERSION_TENS(x) << 4) | VERSION_ONES(x)) << 8) | \
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((VERSION_TENTHS(x) << 4) | VERSION_HUNDREDTHS(x)))
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/** String language ID for the English language. Should be used in \ref USB_Descriptor_String_t descriptors
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* to indicate that the English language is supported by the device in its string descriptors.
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*/
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#define LANGUAGE_ID_ENG 0x0409
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/** Can be masked with an endpoint address for a \ref USB_Descriptor_Endpoint_t endpoint descriptor's
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* EndpointAddress value to indicate to the host that the endpoint is of the IN direction (i.e, from
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* device to host).
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*/
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#define ENDPOINT_DESCRIPTOR_DIR_IN 0x80
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/** Can be masked with an endpoint address for a \ref USB_Descriptor_Endpoint_t endpoint descriptor's
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* EndpointAddress value to indicate to the host that the endpoint is of the OUT direction (i.e, from
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* host to device).
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*/
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#define ENDPOINT_DESCRIPTOR_DIR_OUT 0x00
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/** Can be masked with other configuration descriptor attributes for a \ref USB_Descriptor_Configuration_Header_t
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* descriptor's ConfigAttributes value to indicate that the specified configuration can draw its power
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* from the host's VBUS line.
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*/
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#define USB_CONFIG_ATTR_BUSPOWERED 0x80
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/** Can be masked with other configuration descriptor attributes for a \ref USB_Descriptor_Configuration_Header_t
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* descriptor's ConfigAttributes value to indicate that the specified configuration can draw its power
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* from the device's own power source.
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*/
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#define USB_CONFIG_ATTR_SELFPOWERED 0xC0
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/** Can be masked with other configuration descriptor attributes for a \ref USB_Descriptor_Configuration_Header_t
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* descriptor's ConfigAttributes value to indicate that the specified configuration supports the
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* remote wakeup feature of the USB standard, allowing a suspended USB device to wake up the host upon
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* request.
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*/
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#define USB_CONFIG_ATTR_REMOTEWAKEUP 0xA0
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is not synchronized.
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*
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* \see The USB specification for more details on the possible Endpoint attributes.
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*/
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#define ENDPOINT_ATTR_NO_SYNC (0 << 2)
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is asynchronous.
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*
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* \see The USB specification for more details on the possible Endpoint attributes.
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*/
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#define ENDPOINT_ATTR_ASYNC (1 << 2)
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is adaptive.
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*
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* \see The USB specification for more details on the possible Endpoint attributes.
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*/
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#define ENDPOINT_ATTR_ADAPTIVE (2 << 2)
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is synchronized.
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*
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* \see The USB specification for more details on the possible Endpoint attributes.
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*/
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#define ENDPOINT_ATTR_SYNC (3 << 2)
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is used for data transfers.
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*
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* \see The USB specification for more details on the possible Endpoint usage attributes.
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*/
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#define ENDPOINT_USAGE_DATA (0 << 4)
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is used for feedback.
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*
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* \see The USB specification for more details on the possible Endpoint usage attributes.
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*/
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#define ENDPOINT_USAGE_FEEDBACK (1 << 4)
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/** Can be masked with other endpoint descriptor attributes for a \ref USB_Descriptor_Endpoint_t descriptor's
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* Attributes value to indicate that the specified endpoint is used for implicit feedback.
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*
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* \see The USB specification for more details on the possible Endpoint usage attributes.
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*/
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#define ENDPOINT_USAGE_IMPLICIT_FEEDBACK (2 << 4)
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/* Enums: */
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/** Enum for the possible standard descriptor types, as given in each descriptor's header. */
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enum USB_DescriptorTypes_t
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{
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DTYPE_Device = 0x01, /**< Indicates that the descriptor is a device descriptor. */
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DTYPE_Configuration = 0x02, /**< Indicates that the descriptor is a configuration descriptor. */
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DTYPE_String = 0x03, /**< Indicates that the descriptor is a string descriptor. */
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DTYPE_Interface = 0x04, /**< Indicates that the descriptor is an interface descriptor. */
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DTYPE_Endpoint = 0x05, /**< Indicates that the descriptor is an endpoint descriptor. */
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DTYPE_DeviceQualifier = 0x06, /**< Indicates that the descriptor is a device qualifier descriptor. */
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DTYPE_Other = 0x07, /**< Indicates that the descriptor is of other type. */
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DTYPE_InterfacePower = 0x08, /**< Indicates that the descriptor is an interface power descriptor. */
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DTYPE_InterfaceAssociation = 0x0B, /**< Indicates that the descriptor is an interface association descriptor. */
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};
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/* Type Defines: */
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/** Type define for all descriptors standard header, indicating the descriptor's length and type. This structure
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* uses LUFA-specific element names to make each element's purpose clearer.
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*
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* \see \ref USB_StdDescriptor_Header_t for the version of this define with standard element names
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*/
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typedef struct
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{
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uint8_t Size; /**< Size of the descriptor, in bytes. */
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uint8_t Type; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
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* given by the specific class.
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*/
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} USB_Descriptor_Header_t;
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/** Type define for all descriptors standard header, indicating the descriptor's length and type. This structure
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* uses the relevant standard's given element names to ensure compatibility with the standard.
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*
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* \see \ref USB_Descriptor_Header_t for the version of this define with non-standard LUFA specific element names
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*/
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typedef struct
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{
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uint8_t bLength; /**< Size of the descriptor, in bytes. */
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uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
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* given by the specific class.
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*/
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} USB_StdDescriptor_Header_t;
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/** Type define for a standard Device Descriptor. This structure uses LUFA-specific element names to make each
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* element's purpose clearer.
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*
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* \see \ref USB_StdDescriptor_Device_t for the version of this define with standard element names
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */
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uint16_t USBSpecification; /**< BCD of the supported USB specification. */
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uint8_t Class; /**< USB device class. */
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uint8_t SubClass; /**< USB device subclass. */
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uint8_t Protocol; /**< USB device protocol. */
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uint8_t Endpoint0Size; /**< Size of the control (address 0) endpoint's bank in bytes. */
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uint16_t VendorID; /**< Vendor ID for the USB product. */
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uint16_t ProductID; /**< Unique product ID for the USB product. */
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uint16_t ReleaseNumber; /**< Product release (version) number. */
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uint8_t ManufacturerStrIndex; /**< String index for the manufacturer's name. The
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* host will request this string via a separate
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* control request for the string descriptor.
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*
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* \note If no string supplied, use \ref NO_DESCRIPTOR.
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*/
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uint8_t ProductStrIndex; /**< String index for the product name/details.
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*
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* \see ManufacturerStrIndex structure entry.
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*/
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uint8_t SerialNumStrIndex; /**< String index for the product's globally unique hexadecimal
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* serial number, in uppercase Unicode ASCII.
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*
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* \note On some AVR models, there is an embedded serial number
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* in the chip which can be used for the device serial number.
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* To use this serial number, set this to USE_INTERNAL_SERIAL.
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* On unsupported devices, this will evaluate to 0 and will cause
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* the host to generate a pseudo-unique value for the device upon
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* insertion.
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*
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* \see ManufacturerStrIndex structure entry.
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*/
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uint8_t NumberOfConfigurations; /**< Total number of configurations supported by
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* the device.
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*/
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} USB_Descriptor_Device_t;
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/** Type define for a standard Device Descriptor. This structure uses the relevant standard's given element names
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* to ensure compatibility with the standard.
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*
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* \see \ref USB_Descriptor_Device_t for the version of this define with non-standard LUFA specific element names
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*/
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typedef struct
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{
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uint8_t bLength; /**< Size of the descriptor, in bytes. */
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uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
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* given by the specific class.
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*/
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uint16_t bcdUSB; /**< BCD of the supported USB specification. */
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uint8_t bDeviceClass; /**< USB device class. */
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uint8_t bDeviceSubClass; /**< USB device subclass. */
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uint8_t bDeviceProtocol; /**< USB device protocol. */
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uint8_t bMaxPacketSize0; /**< Size of the control (address 0) endpoint's bank in bytes. */
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uint16_t idVendor; /**< Vendor ID for the USB product. */
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uint16_t idProduct; /**< Unique product ID for the USB product. */
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uint16_t bcdDevice; /**< Product release (version) number. */
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uint8_t iManufacturer; /**< String index for the manufacturer's name. The
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* host will request this string via a separate
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* control request for the string descriptor.
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*
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* \note If no string supplied, use \ref NO_DESCRIPTOR.
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*/
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uint8_t iProduct; /**< String index for the product name/details.
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*
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* \see ManufacturerStrIndex structure entry.
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*/
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uint8_t iSerialNumber; /**< String index for the product's globally unique hexadecimal
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* serial number, in uppercase Unicode ASCII.
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*
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* \note On some AVR models, there is an embedded serial number
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* in the chip which can be used for the device serial number.
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* To use this serial number, set this to USE_INTERNAL_SERIAL.
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* On unsupported devices, this will evaluate to 0 and will cause
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* the host to generate a pseudo-unique value for the device upon
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* insertion.
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*
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* \see ManufacturerStrIndex structure entry.
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*/
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uint8_t bNumConfigurations; /**< Total number of configurations supported by
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* the device.
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*/
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} USB_StdDescriptor_Device_t;
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/** Type define for a standard Configuration Descriptor header. This structure uses LUFA-specific element names
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* to make each element's purpose clearer.
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*
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* \see \ref USB_StdDescriptor_Configuration_Header_t for the version of this define with standard element names
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */
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uint16_t TotalConfigurationSize; /**< Size of the configuration descriptor header,
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* and all sub descriptors inside the configuration.
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*/
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uint8_t TotalInterfaces; /**< Total number of interfaces in the configuration. */
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uint8_t ConfigurationNumber; /**< Configuration index of the current configuration. */
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uint8_t ConfigurationStrIndex; /**< Index of a string descriptor describing the configuration. */
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uint8_t ConfigAttributes; /**< Configuration attributes, comprised of a mask of zero or
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* more USB_CONFIG_ATTR_* masks.
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*/
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uint8_t MaxPowerConsumption; /**< Maximum power consumption of the device while in the
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* current configuration, calculated by the \ref USB_CONFIG_POWER_MA()
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* macro.
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*/
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} USB_Descriptor_Configuration_Header_t;
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/** Type define for a standard Configuration Descriptor header. This structure uses the relevant standard's given element names
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* to ensure compatibility with the standard.
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*
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* \see \ref USB_Descriptor_Device_t for the version of this define with non-standard LUFA specific element names
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*/
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typedef struct
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{
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uint8_t bLength; /**< Size of the descriptor, in bytes. */
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uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
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* given by the specific class.
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*/
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uint16_t wTotalLength; /**< Size of the configuration descriptor header,
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* and all sub descriptors inside the configuration.
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*/
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uint8_t bNumInterfaces; /**< Total number of interfaces in the configuration. */
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uint8_t bConfigurationValue; /**< Configuration index of the current configuration. */
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uint8_t iConfiguration; /**< Index of a string descriptor describing the configuration. */
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uint8_t bmAttributes; /**< Configuration attributes, comprised of a mask of zero or
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* more USB_CONFIG_ATTR_* masks.
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*/
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uint8_t bMaxPower; /**< Maximum power consumption of the device while in the
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* current configuration, calculated by the \ref USB_CONFIG_POWER_MA()
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* macro.
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*/
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} USB_StdDescriptor_Configuration_Header_t;
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/** Type define for a standard Interface Descriptor. This structure uses LUFA-specific element names
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* to make each element's purpose clearer.
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*
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* \see \ref USB_StdDescriptor_Interface_t for the version of this define with standard element names
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */
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uint8_t InterfaceNumber; /**< Index of the interface in the current configuration. */
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uint8_t AlternateSetting; /**< Alternate setting for the interface number. The same
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* interface number can have multiple alternate settings
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* with different endpoint configurations, which can be
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* selected by the host.
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*/
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uint8_t TotalEndpoints; /**< Total number of endpoints in the interface. */
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uint8_t Class; /**< Interface class ID. */
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uint8_t SubClass; /**< Interface subclass ID. */
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uint8_t Protocol; /**< Interface protocol ID. */
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uint8_t InterfaceStrIndex; /**< Index of the string descriptor describing the
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* interface.
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*/
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} USB_Descriptor_Interface_t;
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/** Type define for a standard Interface Descriptor. This structure uses the relevant standard's given element names
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* to ensure compatibility with the standard.
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*
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* \see \ref USB_Descriptor_Interface_t for the version of this define with non-standard LUFA specific element names
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*/
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typedef struct
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{
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uint8_t bLength; /**< Size of the descriptor, in bytes. */
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uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
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* given by the specific class.
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*/
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uint8_t bInterfaceNumber; /**< Index of the interface in the current configuration. */
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uint8_t bAlternateSetting; /**< Alternate setting for the interface number. The same
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* interface number can have multiple alternate settings
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* with different endpoint configurations, which can be
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* selected by the host.
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*/
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uint8_t bNumEndpoints; /**< Total number of endpoints in the interface. */
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uint8_t bInterfaceClass; /**< Interface class ID. */
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uint8_t bInterfaceSubClass; /**< Interface subclass ID. */
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uint8_t bInterfaceProtocol; /**< Interface protocol ID. */
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uint8_t iInterface; /**< Index of the string descriptor describing the
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* interface.
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*/
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} USB_StdDescriptor_Interface_t;
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/** Type define for a standard Interface Association Descriptor. This structure uses LUFA-specific element names
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* to make each element's purpose clearer.
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*
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* This descriptor has been added as a supplement to the USB2.0 standard, in the ECN located at
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* <a>http://www.usb.org/developers/docs/InterfaceAssociationDescriptor_ecn.pdf</a>. It allows compound
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* devices with multiple interfaces related to the same function to have the multiple interfaces bound
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* together at the point of enumeration, loading one generic driver for all the interfaces in the single
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* function. Read the ECN for more information.
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*
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* \see \ref USB_StdDescriptor_Interface_Association_t for the version of this define with standard element names
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */
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uint8_t FirstInterfaceIndex; /**< Index of the first associated interface. */
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uint8_t TotalInterfaces; /** Total number of associated interfaces. */
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uint8_t Class; /**< Interface class ID. */
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uint8_t SubClass; /**< Interface subclass ID. */
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uint8_t Protocol; /**< Interface protocol ID. */
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uint8_t IADStrIndex; /**< Index of the string descriptor describing the
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* interface association.
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*/
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} USB_Descriptor_Interface_Association_t;
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/** Type define for a standard Interface Association Descriptor. This structure uses the relevant standard's given
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* element names to ensure compatibility with the standard.
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*
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* This descriptor has been added as a supplement to the USB2.0 standard, in the ECN located at
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* <a>http://www.usb.org/developers/docs/InterfaceAssociationDescriptor_ecn.pdf</a>. It allows compound
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* devices with multiple interfaces related to the same function to have the multiple interfaces bound
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* together at the point of enumeration, loading one generic driver for all the interfaces in the single
|
|
* function. Read the ECN for more information.
|
|
*
|
|
* \see \ref USB_Descriptor_Interface_Association_t for the version of this define with non-standard LUFA specific
|
|
* element names
|
|
*/
|
|
typedef struct
|
|
{
|
|
uint8_t bLength; /**< Size of the descriptor, in bytes. */
|
|
uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
|
|
* given by the specific class.
|
|
*/
|
|
uint8_t bFirstInterface; /**< Index of the first associated interface. */
|
|
uint8_t bInterfaceCount; /** Total number of associated interfaces. */
|
|
uint8_t bFunctionClass; /**< Interface class ID. */
|
|
uint8_t bFunctionSubClass; /**< Interface subclass ID. */
|
|
uint8_t bFunctionProtocol; /**< Interface protocol ID. */
|
|
uint8_t iFunction; /**< Index of the string descriptor describing the
|
|
* interface association.
|
|
*/
|
|
} USB_StdDescriptor_Interface_Association_t;
|
|
|
|
/** Type define for a standard Endpoint Descriptor. This structure uses LUFA-specific element names
|
|
* to make each element's purpose clearer.
|
|
*
|
|
* \see \ref USB_StdDescriptor_Endpoint_t for the version of this define with standard element names
|
|
*/
|
|
typedef struct
|
|
{
|
|
USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */
|
|
|
|
uint8_t EndpointAddress; /**< Logical address of the endpoint within the device
|
|
* for the current configuration, including direction
|
|
* mask.
|
|
*/
|
|
uint8_t Attributes; /**< Endpoint attributes, comprised of a mask of the
|
|
* endpoint type (EP_TYPE_*) and attributes (ENDPOINT_ATTR_*)
|
|
* masks.
|
|
*/
|
|
uint16_t EndpointSize; /**< Size of the endpoint bank, in bytes. This indicates the
|
|
* maximum packet size that the endpoint can receive at a time.
|
|
*/
|
|
|
|
uint8_t PollingIntervalMS; /**< Polling interval in milliseconds for the endpoint
|
|
* if it is an INTERRUPT or ISOCHRONOUS type.
|
|
*/
|
|
} USB_Descriptor_Endpoint_t;
|
|
|
|
/** Type define for a standard Endpoint Descriptor. This structure uses the relevant standard's given
|
|
* element names to ensure compatibility with the standard.
|
|
*
|
|
* \see \ref USB_Descriptor_Endpoint_t for the version of this define with non-standard LUFA specific
|
|
* element names
|
|
*/
|
|
typedef struct
|
|
{
|
|
uint8_t bLength; /**< Size of the descriptor, in bytes. */
|
|
uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
|
|
* given by the specific class.
|
|
*/
|
|
uint8_t bEndpointAddress; /**< Logical address of the endpoint within the device
|
|
* for the current configuration, including direction
|
|
* mask.
|
|
*/
|
|
uint8_t bmAttributes; /**< Endpoint attributes, comprised of a mask of the
|
|
* endpoint type (EP_TYPE_*) and attributes (ENDPOINT_ATTR_*)
|
|
* masks.
|
|
*/
|
|
uint16_t wMaxPacketSize; /**< Size of the endpoint bank, in bytes. This indicates the
|
|
* maximum packet size that the endpoint can receive at a time.
|
|
*/
|
|
uint8_t bInterval; /**< Polling interval in milliseconds for the endpoint
|
|
* if it is an INTERRUPT or ISOCHRONOUS type.
|
|
*/
|
|
} USB_StdDescriptor_Endpoint_t;
|
|
|
|
/** Type define for a standard string descriptor. Unlike other standard descriptors, the length
|
|
* of the descriptor for placement in the descriptor header must be determined by the \ref USB_STRING_LEN()
|
|
* macro rather than by the size of the descriptor structure, as the length is not fixed.
|
|
*
|
|
* This structure should also be used for string index 0, which contains the supported language IDs for
|
|
* the device as an array.
|
|
*
|
|
* This structure uses LUFA-specific element names to make each element's purpose clearer.
|
|
*
|
|
* \see \ref USB_StdDescriptor_String_t for the version of this define with standard element names
|
|
*/
|
|
typedef struct
|
|
{
|
|
USB_Descriptor_Header_t Header; /**< Descriptor header, including type and size. */
|
|
|
|
int16_t UnicodeString[]; /**< String data, as unicode characters (alternatively,
|
|
* string language IDs). If normal ASCII characters are
|
|
* to be used, they must be added as an array of characters
|
|
* rather than a normal C string so that they are widened to
|
|
* Unicode size.
|
|
*
|
|
* Under GCC, strings prefixed with the "L" character (before
|
|
* the opening string quotation mark) are considered to be
|
|
* Unicode strings, and may be used instead of an explicit
|
|
* array of ASCII characters.
|
|
*/
|
|
} USB_Descriptor_String_t;
|
|
|
|
/** Type define for a standard string descriptor. Unlike other standard descriptors, the length
|
|
* of the descriptor for placement in the descriptor header must be determined by the \ref USB_STRING_LEN()
|
|
* macro rather than by the size of the descriptor structure, as the length is not fixed.
|
|
*
|
|
* This structure should also be used for string index 0, which contains the supported language IDs for
|
|
* the device as an array.
|
|
*
|
|
* This structure uses the relevant standard's given element names to ensure compatibility with the standard.
|
|
*
|
|
* \see \ref USB_Descriptor_String_t for the version of this define with with non-standard LUFA specific
|
|
* element names
|
|
*/
|
|
typedef struct
|
|
{
|
|
uint8_t bLength; /**< Size of the descriptor, in bytes. */
|
|
uint8_t bDescriptorType; /**< Type of the descriptor, either a value in
|
|
* \ref USB_DescriptorTypes_t or a value
|
|
* given by the specific class.
|
|
*/
|
|
int16_t bString[]; /**< String data, as unicode characters (alternatively,
|
|
* string language IDs). If normal ASCII characters are
|
|
* to be used, they must be added as an array of characters
|
|
* rather than a normal C string so that they are widened to
|
|
* Unicode size.
|
|
*
|
|
* Under GCC, strings prefixed with the "L" character (before
|
|
* the opening string quotation mark) are considered to be
|
|
* Unicode strings, and may be used instead of an explicit
|
|
* array of ASCII characters.
|
|
*/
|
|
} USB_StdDescriptor_String_t;
|
|
|
|
/* Private Interface - For use in library only: */
|
|
#if !defined(__DOXYGEN__)
|
|
/* Macros: */
|
|
#define VERSION_TENS(x) (int)(x / 10)
|
|
#define VERSION_ONES(x) (int)(x - (10 * VERSION_TENS(x)))
|
|
#define VERSION_TENTHS(x) (int)((x - (int)x) * 10)
|
|
#define VERSION_HUNDREDTHS(x) (int)(((x - (int)x) * 100) - (10 * VERSION_TENTHS(x)))
|
|
#endif
|
|
|
|
/* Disable C linkage for C++ Compilers: */
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/** @} */
|