You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
272 lines
13 KiB
272 lines
13 KiB
/*
|
|
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.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* Configuration descriptor parser API. This section of the library gives a friendly API which can be used in
|
|
* host applications to easily parse an attached device's configuration descriptor so that endpoint, interface
|
|
* and other descriptor data can be extracted and used as needed.
|
|
*/
|
|
|
|
/** \ingroup Group_Descriptors
|
|
* @defgroup Group_ConfigDescriptorParser Configuration Descriptor Parser
|
|
*
|
|
* Functions, macros, variables, enums and types related to the parsing of Configuration Descriptors.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
#ifndef __CONFIGDESCRIPTOR_H__
|
|
#define __CONFIGDESCRIPTOR_H__
|
|
|
|
/* Includes: */
|
|
#include <avr/io.h>
|
|
|
|
#include "../../../Common/Common.h"
|
|
#include "../HighLevel/USBMode.h"
|
|
#include "../LowLevel/HostChapter9.h"
|
|
#include "../HighLevel/StdDescriptors.h"
|
|
|
|
/* Enable C linkage for C++ Compilers: */
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Public Interface - May be used in end-application: */
|
|
/* Macros: */
|
|
/** Mask for determining the type of an endpoint from an endpoint descriptor. This should then be compared
|
|
* with the EP_TYPE_* masks to determine the exact type of the endpoint.
|
|
*/
|
|
#define EP_TYPE_MASK 0x03
|
|
|
|
/** Casts a pointer to a descriptor inside the configuration descriptor into a pointer to the given
|
|
* descriptor type.
|
|
*
|
|
* Usage Example:
|
|
* \code
|
|
* uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
|
|
* USB_Descriptor_Configuration_Header_t* ConfigHeaderPtr = DESCRIPTOR_PCAST(CurrDescriptor,
|
|
* USB_Descriptor_Configuration_Header_t);
|
|
*
|
|
* // Can now access elements of the configuration header struct using the -> indirection operator
|
|
* \endcode
|
|
*/
|
|
#define DESCRIPTOR_PCAST(DescriptorPtr, Type) ((Type*)DescriptorPtr)
|
|
|
|
/** Casts a pointer to a descriptor inside the configuration descriptor into the given descriptor
|
|
* type (as an actual struct instance rather than a pointer to a struct).
|
|
*
|
|
* Usage Example:
|
|
* \code
|
|
* uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
|
|
* USB_Descriptor_Configuration_Header_t ConfigHeader = DESCRIPTOR_CAST(CurrDescriptor,
|
|
* USB_Descriptor_Configuration_Header_t);
|
|
*
|
|
* // Can now access elements of the configuration header struct using the . operator
|
|
* \endcode
|
|
*/
|
|
#define DESCRIPTOR_CAST(DescriptorPtr, Type) (*DESCRIPTOR_PCAST(DescriptorPtr, Type))
|
|
|
|
/** Returns the descriptor's type, expressed as the 8-bit type value in the header of the descriptor.
|
|
* This value's meaning depends on the descriptor's placement in the descriptor, but standard type
|
|
* values can be accessed in the \ref USB_DescriptorTypes_t enum.
|
|
*/
|
|
#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)
|
|
#define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Type
|
|
#else
|
|
#define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).bDescriptorType
|
|
#endif
|
|
|
|
/** Returns the descriptor's size, expressed as the 8-bit value indicating the number of bytes. */
|
|
#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)
|
|
#define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Size
|
|
#else
|
|
#define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).bLength
|
|
#endif
|
|
|
|
/* Type Defines: */
|
|
/** Type define for a Configuration Descriptor comparator function (function taking a pointer to an array
|
|
* of type void, returning a uint8_t value).
|
|
*
|
|
* \see \ref USB_GetNextDescriptorComp function for more details
|
|
*/
|
|
typedef uint8_t (* const ConfigComparatorPtr_t)(void* const);
|
|
|
|
/* Function Prototypes: */
|
|
/** Searches for the next descriptor in the given configuration descriptor using a premade comparator
|
|
* function. The routine updates the position and remaining configuration descriptor bytes values
|
|
* automatically. If a comparator routine fails a search, the descriptor pointer is retreated back
|
|
* so that the next descriptor search invocation will start from the descriptor which first caused the
|
|
* original search to fail. This behaviour allows for one comparator to be used immediately after another
|
|
* has failed, starting the second search from the descriptor which failed the first.
|
|
*
|
|
* Comparator functions should be standard functions which accept a pointer to the header of the current
|
|
* descriptor inside the configuration descriptor which is being compared, and should return a value from
|
|
* the \ref DSearch_Return_ErrorCodes_t enum as a uint8_t value.
|
|
*
|
|
* \note This function is available in USB Host mode only.
|
|
*
|
|
* \param BytesRem Pointer to an int storing the remaining bytes in the configuration descriptor
|
|
* \param CurrConfigLoc Pointer to the current position in the configuration descriptor
|
|
* \param ComparatorRoutine Name of the comparator search function to use on the configuration descriptor
|
|
*
|
|
* \return Value of one of the members of the \ref DSearch_Comp_Return_ErrorCodes_t enum
|
|
*
|
|
* Usage Example:
|
|
* \code
|
|
* uint8_t EndpointSearcher(void* CurrentDescriptor); // Comparator Prototype
|
|
*
|
|
* uint8_t EndpointSearcher(void* CurrentDescriptor)
|
|
* {
|
|
* if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
|
|
* return DESCRIPTOR_SEARCH_Found;
|
|
* else
|
|
* return DESCRIPTOR_SEARCH_NotFound;
|
|
* }
|
|
*
|
|
* //...
|
|
* // After retrieving configuration descriptor:
|
|
* if (USB_Host_GetNextDescriptorComp(&BytesRemaining, &ConfigDescriptorData, EndpointSearcher) ==
|
|
* Descriptor_Search_Comp_Found)
|
|
* {
|
|
* // Do something with the endpoint descriptor
|
|
* }
|
|
* \endcode
|
|
*/
|
|
uint8_t USB_GetNextDescriptorComp(uint16_t* BytesRem, uint8_t** CurrConfigLoc, ConfigComparatorPtr_t ComparatorRoutine);
|
|
|
|
/* Enums: */
|
|
/** Enum for return values of a descriptor comparator function. */
|
|
enum DSearch_Return_ErrorCodes_t
|
|
{
|
|
DESCRIPTOR_SEARCH_Found = 0, /**< Current descriptor matches comparator criteria. */
|
|
DESCRIPTOR_SEARCH_Fail = 1, /**< No further descriptor could possibly match criteria, fail the search. */
|
|
DESCRIPTOR_SEARCH_NotFound = 2, /**< Current descriptor does not match comparator criteria. */
|
|
};
|
|
|
|
/** Enum for return values of \ref USB_GetNextDescriptorComp(). */
|
|
enum DSearch_Comp_Return_ErrorCodes_t
|
|
{
|
|
DESCRIPTOR_SEARCH_COMP_Found = 0, /**< Configuration descriptor now points to descriptor which matches
|
|
* search criteria of the given comparator function. */
|
|
DESCRIPTOR_SEARCH_COMP_Fail = 1, /**< Comparator function returned Descriptor_Search_Fail. */
|
|
DESCRIPTOR_SEARCH_COMP_EndOfDescriptor = 2, /**< End of configuration descriptor reached before match found. */
|
|
};
|
|
|
|
/* Function Prototypes: */
|
|
/** Retrieves the configuration descriptor data or size from an attached device via a standard request.
|
|
*
|
|
* \param ConfigSizePtr Pointer to a uint16_t for either storing or retrieving the configuration
|
|
* descriptor size
|
|
*
|
|
* \param BufferPtr Pointer to the buffer for storing the configuration descriptor data. If this is
|
|
* NULL, the size of the configuration descriptor will be retrieved instead and
|
|
* placed in the variable pointed to by ConfigSizePtr. If this is non-NULL, the number
|
|
* of bytes indicated by ConfigSizePtr of the configuration descriptor will be loaded
|
|
* into the buffer
|
|
*/
|
|
uint8_t USB_GetDeviceConfigDescriptor(uint16_t* const ConfigSizePtr, void* BufferPtr)
|
|
ATTR_NON_NULL_PTR_ARG(1);
|
|
|
|
/** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value.
|
|
* The bytes remaining value is automatically decremented.
|
|
*
|
|
* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
|
|
* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
|
|
* \param Type Descriptor type value to search for
|
|
*/
|
|
void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
|
|
uint8_t** const CurrConfigLoc,
|
|
const uint8_t Type)
|
|
ATTR_NON_NULL_PTR_ARG(1, 2);
|
|
|
|
/** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,
|
|
* which must come before a descriptor of the second given type value. If the BeforeType type
|
|
* descriptor is reached first, the number of bytes remaining to process is set to zero and the
|
|
* function exits. The bytes remaining value is automatically decremented.
|
|
*
|
|
* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
|
|
* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
|
|
* \param Type Descriptor type value to search for
|
|
* \param BeforeType Descriptor type value which must not be reached before the given Type descriptor
|
|
*/
|
|
void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
|
|
uint8_t** const CurrConfigLoc,
|
|
const uint8_t Type,
|
|
const uint8_t BeforeType)
|
|
ATTR_NON_NULL_PTR_ARG(1, 2);
|
|
|
|
/** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,
|
|
* which must come after a descriptor of the second given type value. The bytes remaining value is
|
|
* automatically decremented.
|
|
*
|
|
* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
|
|
* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
|
|
* \param Type Descriptor type value to search for
|
|
* \param AfterType Descriptor type value which must be reached before the given Type descriptor
|
|
*/
|
|
void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
|
|
uint8_t** const CurrConfigLoc,
|
|
const uint8_t Type,
|
|
const uint8_t AfterType)
|
|
ATTR_NON_NULL_PTR_ARG(1, 2);
|
|
|
|
/* Inline Functions: */
|
|
/** Skips over the current sub-descriptor inside the configuration descriptor, so that the pointer then
|
|
points to the next sub-descriptor. The bytes remaining value is automatically decremented.
|
|
*
|
|
* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
|
|
* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
|
|
*/
|
|
static inline void USB_GetNextDescriptor(uint16_t* const BytesRem,
|
|
uint8_t** const CurrConfigLoc)
|
|
ATTR_NON_NULL_PTR_ARG(1, 2);
|
|
static inline void USB_GetNextDescriptor(uint16_t* const BytesRem,
|
|
uint8_t** const CurrConfigLoc)
|
|
{
|
|
#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)
|
|
uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size;
|
|
#else
|
|
uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).bLength;
|
|
#endif
|
|
|
|
*CurrConfigLoc += CurrDescriptorSize;
|
|
*BytesRem -= CurrDescriptorSize;
|
|
}
|
|
|
|
/* Disable C linkage for C++ Compilers: */
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/** @} */
|