X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/7fbb75928749b74a0964ad159159066967191243..bea72a8412f99b294c00341fa16a8308bcc66f15:/LUFA/Drivers/USB/HighLevel/ConfigDescriptor.h?ds=inline diff --git a/LUFA/Drivers/USB/HighLevel/ConfigDescriptor.h b/LUFA/Drivers/USB/HighLevel/ConfigDescriptor.h index 8c4e2c2db..001653b52 100644 --- a/LUFA/Drivers/USB/HighLevel/ConfigDescriptor.h +++ b/LUFA/Drivers/USB/HighLevel/ConfigDescriptor.h @@ -1,288 +1,286 @@ -/* - 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 - - #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[in,out] BytesRem Pointer to an int storing the remaining bytes in the configuration descriptor - * \param[in,out] CurrConfigLoc Pointer to the current position in the configuration descriptor - * \param[in] 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 USB_Host_GetConfigDescriptor_ErrorCodes_t - { - HOST_GETCONFIG_Successful = 0, /**< No error occurred while retrieving the configuration descriptor */ - HOST_GETCONFIG_DeviceDisconnect = 1, /**< The attached device was disconnected while retrieving the configuration - * descriptor - */ - HOST_GETCONFIG_PipeError = 2, /**< An error occurred in the pipe while sending the request */ - HOST_GETCONFIG_SetupStalled = 3, /**< The attached device stalled the request to retrieve the configuration - * descriptor - */ - HOST_GETCONFIG_SoftwareTimeOut = 4, /**< The request or data transfer timed out */ - HOST_GETCONFIG_BuffOverflow = 5, /**< The device's configuration descriptor is too large to fit into the allocated - * buffer - */ - HOST_GETCONFIG_InvalidData = 6, /**< The device returned invalid configuration descriptor data */ - }; - - /** 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 from an attached device via a standard request into a buffer, - * including validity and size checking to prevent a buffer overflow. - * - * \param[in] ConfigNumber Device configuration descriptor number to fetch from the device (usually set to 1 for - * single configuration devices) - * \param[in,out] ConfigSizePtr Pointer to a uint16_t for storing the retrieved configuration descriptor size - * \param[out] BufferPtr Pointer to the buffer for storing the configuration descriptor data. - * \param[out] BufferSize Size of the allocated buffer where the configuration descriptor is to be stored - * - * \return A value from the \ref USB_Host_GetConfigDescriptor_ErrorCodes_t enum - */ - uint8_t USB_GetDeviceConfigDescriptor(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr, void* BufferPtr, - uint16_t BufferSize) ATTR_NON_NULL_PTR_ARG(2, 3); - - /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value. - * The bytes remaining value is automatically decremented. - * - * \param[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor - * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor - * \param[in] 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor - * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor - * \param[in] Type Descriptor type value to search for - * \param[in] 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor - * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor - * \param[in] Type Descriptor type value to search for - * \param[in] 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor - * \param[in,out] 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 - -/** @} */ +/* + 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 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. + * + * \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_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 + + #include "../../../Common/Common.h" + #include "HostStandardReq.h" + #include "USBMode.h" + #include "StdDescriptors.h" + + /* 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 + + /* 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. + */ + #define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Type + + /** Returns the descriptor's size, expressed as the 8-bit value indicating the number of bytes. */ + #define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Size + + /* 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 (* ConfigComparatorPtr_t)(void*); + + /* Enums: */ + /** Enum for the possible return codes of the \ref USB_Host_GetDeviceConfigDescriptor() function. */ + enum USB_Host_GetConfigDescriptor_ErrorCodes_t + { + HOST_GETCONFIG_Successful = 0, /**< No error occurred while retrieving the configuration descriptor. */ + HOST_GETCONFIG_DeviceDisconnect = 1, /**< The attached device was disconnected while retrieving the configuration + * descriptor. + */ + HOST_GETCONFIG_PipeError = 2, /**< An error occurred in the pipe while sending the request. */ + HOST_GETCONFIG_SetupStalled = 3, /**< The attached device stalled the request to retrieve the configuration + * descriptor. + */ + HOST_GETCONFIG_SoftwareTimeOut = 4, /**< The request or data transfer timed out. */ + HOST_GETCONFIG_BuffOverflow = 5, /**< The device's configuration descriptor is too large to fit into the allocated + * buffer. + */ + HOST_GETCONFIG_InvalidData = 6, /**< The device returned invalid configuration descriptor data. */ + }; + + /** 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 from an attached device via a standard request into a buffer, + * including validity and size checking to prevent a buffer overflow. + * + * \param[in] ConfigNumber Device configuration descriptor number to fetch from the device (usually set to 1 for + * single configuration devices). + * \param[in,out] ConfigSizePtr Pointer to a uint16_t for storing the retrieved configuration descriptor size. + * \param[out] BufferPtr Pointer to the buffer for storing the configuration descriptor data. + * \param[out] BufferSize Size of the allocated buffer where the configuration descriptor is to be stored. + * + * \return A value from the \ref USB_Host_GetConfigDescriptor_ErrorCodes_t enum. + */ + uint8_t USB_Host_GetDeviceConfigDescriptor(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr, void* BufferPtr, + uint16_t BufferSize) ATTR_NON_NULL_PTR_ARG(2) ATTR_NON_NULL_PTR_ARG(3); + + /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value. + * The bytes remaining value is automatically decremented. + * + * \param[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor. + * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor. + * \param[in] Type Descriptor type value to search for. + */ + void USB_GetNextDescriptorOfType(uint16_t* const BytesRem, + void** const CurrConfigLoc, + const uint8_t Type) + ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor. + * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor. + * \param[in] Type Descriptor type value to search for. + * \param[in] BeforeType Descriptor type value which must not be reached before the given Type descriptor. + */ + void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem, + void** const CurrConfigLoc, + const uint8_t Type, + const uint8_t BeforeType) + ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor. + * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor. + * \param[in] Type Descriptor type value to search for. + * \param[in] AfterType Descriptor type value which must be reached before the given Type descriptor. + */ + void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem, + void** const CurrConfigLoc, + const uint8_t Type, + const uint8_t AfterType) + ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2); + + /** Searches for the next descriptor in the given configuration descriptor using a pre-made 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[in,out] BytesRem Pointer to an int storing the remaining bytes in the configuration descriptor. + * \param[in,out] CurrConfigLoc Pointer to the current position in the configuration descriptor. + * \param[in] 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, &CurrentConfigLoc, EndpointSearcher) == + * Descriptor_Search_Comp_Found) + * { + * // Do something with the endpoint descriptor + * } + * \endcode + */ + uint8_t USB_GetNextDescriptorComp(uint16_t* const BytesRem, + void** const CurrConfigLoc, + ConfigComparatorPtr_t const ComparatorRoutine); + + /* 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor. + * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor. + */ + static inline void USB_GetNextDescriptor(uint16_t* const BytesRem, + void** CurrConfigLoc) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2); + static inline void USB_GetNextDescriptor(uint16_t* const BytesRem, + void** CurrConfigLoc) + { + uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size; + + *CurrConfigLoc = ((uint8_t*)*CurrConfigLoc) + CurrDescriptorSize; + *BytesRem -= CurrDescriptorSize; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */