*/
/** \ingroup Group_USB
- * @defgroup Group_HIDParser HID Report Parser
+ * \defgroup Group_HIDParser HID Report Parser
+ * \brief USB Human Interface Device (HID) Class report descriptor parser.
*
* \section Sec_Dependencies Module Source Dependencies
* The following files must be built with any user project that uses this module:
* - LUFA/Drivers/USB/Class/Host/HIDParser.c <i>(Makefile source module name: LUFA_SRC_USB)</i>
*
* \section Sec_ModDescription Module Description
- * Functions, macros, variables, enums and types related to the parsing of HID class device report descriptors.
+ * Human Interface Device (HID) class report descriptor parser. This module implements a parser than is
+ * capable of processing a complete HID report descriptor, and outputting a flat structure containing the
+ * contents of the report in an a more friendly format. The parsed data may then be further processed and used
+ * within an application to process sent and received HID reports to and from an attached HID device.
*
- * The processed HID report is presented back to the user application as a flat structure containing each report
- * item's IN, OUT and FEATURE items along with each item's attributes.
+ * A HID report descriptor consists of a set of HID report items, which describe the function and layout
+ * of data exchanged between a HID device and a host, including both the physical encoding of each item
+ * (such as a button, key press or joystick axis) in the sent and received data packets - known as "reports" -
+ * as well as other information about each item such as the usages, data range, physical location and other
+ * characteristics. In this way a HID device can retain a high degree of flexibility in its capabilities, as it
+ * is not forced to comply with a given report layout or feature-set.
*
- * This library portion also allows for easy setting and retrieval of data from a HID report, including devices
- * with multiple reports on the one HID interface.
+ * This module also contains routines for the processing of data in an actual HID report, using the parsed report
+ * descriptor data as a guide for the encoding.
*
* @{
*/
#define __HIDPARSER_H__
/* Includes: */
- #include <string.h>
- #include <stdbool.h>
+ #include "../../../../Common/Common.h"
#include "HIDReportData.h"
#include "../Common/HID.h"
-
- #include "../../../../Common/Common.h"
-
+
/* Enable C linkage for C++ Compilers: */
#if defined(__cplusplus)
extern "C" {
*/
typedef struct
{
- uint32_t Minimum; /**< Minimum value for the attribute. */
- uint32_t Maximum; /**< Maximum value for the attribute. */
+ uint32_t Minimum; /**< Minimum value for the attribute. */
+ uint32_t Maximum; /**< Maximum value for the attribute. */
} HID_MinMax_t;
/** \brief HID Parser Report Item Unit Structure.
*/
typedef struct
{
- uint32_t Type; /**< Unit type (refer to HID specifications for details). */
- uint8_t Exponent; /**< Unit exponent (refer to HID specifications for details). */
+ uint32_t Type; /**< Unit type (refer to HID specifications for details). */
+ uint8_t Exponent; /**< Unit exponent (refer to HID specifications for details). */
} HID_Unit_t;
/** \brief HID Parser Report Item Usage Structure.
*/
typedef struct
{
- uint16_t Page; /**< Usage page of the report item. */
- uint16_t Usage; /**< Usage of the report item. */
+ uint16_t Page; /**< Usage page of the report item. */
+ uint16_t Usage; /**< Usage of the report item. */
} HID_Usage_t;
/** \brief HID Parser Report Item Collection Path Structure.
* Type define for a COLLECTION object. Contains the collection attributes and a reference to the
* parent collection if any.
*/
- typedef struct CollectionPath
+ typedef struct HID_CollectionPath
{
- uint8_t Type; /**< Collection type (e.g. "Generic Desktop"). */
- HID_Usage_t Usage; /**< Collection usage. */
- struct CollectionPath* Parent; /**< Reference to parent collection, or \c NULL if root collection. */
+ uint8_t Type; /**< Collection type (e.g. "Generic Desktop"). */
+ HID_Usage_t Usage; /**< Collection usage. */
+ struct HID_CollectionPath* Parent; /**< Reference to parent collection, or \c NULL if root collection. */
} HID_CollectionPath_t;
/** \brief HID Parser Report Item Attributes Structure.
*/
typedef struct
{
- uint8_t BitSize; /**< Size in bits of the report item's data. */
+ uint8_t BitSize; /**< Size in bits of the report item's data. */
- HID_Usage_t Usage; /**< Usage of the report item. */
- HID_Unit_t Unit; /**< Unit type and exponent of the report item. */
- HID_MinMax_t Logical; /**< Logical minimum and maximum of the report item. */
- HID_MinMax_t Physical; /**< Physical minimum and maximum of the report item. */
+ HID_Usage_t Usage; /**< Usage of the report item. */
+ HID_Unit_t Unit; /**< Unit type and exponent of the report item. */
+ HID_MinMax_t Logical; /**< Logical minimum and maximum of the report item. */
+ HID_MinMax_t Physical; /**< Physical minimum and maximum of the report item. */
} HID_ReportItem_Attributes_t;
/** \brief HID Parser Report Item Details Structure.
*/
typedef struct
{
- uint16_t BitOffset; /**< Bit offset in the IN, OUT or FEATURE report of the item. */
- uint8_t ItemType; /**< Report item type, a value in \ref HID_ReportItemTypes_t. */
- uint16_t ItemFlags; /**< Item data flags, such as constant/variable, etc. */
- uint8_t ReportID; /**< Report ID this item belongs to, or 0x00 if device has only one report */
- HID_CollectionPath_t* CollectionPath; /**< Collection path of the item. */
-
- HID_ReportItem_Attributes_t Attributes; /**< Report item attributes. */
-
- uint32_t Value; /**< Current value of the report item - use \ref HID_ALIGN_DATA() when processing
- * a retrieved value so that it is aligned to a specific type.
- */
- uint32_t PreviousValue; /**< Previous value of the report item. */
+ uint16_t BitOffset; /**< Bit offset in the IN, OUT or FEATURE report of the item. */
+ uint8_t ItemType; /**< Report item type, a value in \ref HID_ReportItemTypes_t. */
+ uint16_t ItemFlags; /**< Item data flags, a mask of HID_IOF_* constants. */
+ uint8_t ReportID; /**< Report ID this item belongs to, or 0x00 if device has only one report */
+ HID_CollectionPath_t* CollectionPath; /**< Collection path of the item. */
+
+ HID_ReportItem_Attributes_t Attributes; /**< Report item attributes. */
+
+ uint32_t Value; /**< Current value of the report item - use \ref HID_ALIGN_DATA() when processing
+ * a retrieved value so that it is aligned to a specific type.
+ */
+ uint32_t PreviousValue; /**< Previous value of the report item. */
} HID_ReportItem_t;
/** \brief HID Parser Report Size Structure.
*/
typedef struct
{
- uint8_t ReportID; /**< Report ID of the report within the HID interface. */
- uint16_t ReportSizeBits[3]; /**< Total number of bits in each report type for the given Report ID,
- * indexed by the \ref HID_ReportItemTypes_t enum.
- */
+ uint8_t ReportID; /**< Report ID of the report within the HID interface. */
+ uint16_t ReportSizeBits[3]; /**< Total number of bits in each report type for the given Report ID,
+ * indexed by the \ref HID_ReportItemTypes_t enum.
+ */
} HID_ReportSizeInfo_t;
/** \brief HID Parser State Structure.
*/
typedef struct
{
- uint8_t TotalReportItems; /**< Total number of report items stored in the
- * \c ReportItems array.
- */
- HID_ReportItem_t ReportItems[HID_MAX_REPORTITEMS]; /**< Report items array, including
- * all IN, OUT and FEATURE items.
- */
- HID_CollectionPath_t CollectionPaths[HID_MAX_COLLECTIONS]; /**< All collection items, referenced
- * by the report items.
- */
- uint8_t TotalDeviceReports; /**< Number of reports within the HID interface */
- HID_ReportSizeInfo_t ReportIDSizes[HID_MAX_REPORT_IDS]; /**< Report sizes for each report in the interface */
- uint16_t LargestReportSizeBits; /**< Largest report that the attached device will generate, in bits */
- bool UsingReportIDs; /**< Indicates if the device has at least one REPORT ID
- * element in its HID report descriptor.
- */
+ uint8_t TotalReportItems; /**< Total number of report items stored in the \c ReportItems array. */
+ HID_ReportItem_t ReportItems[HID_MAX_REPORTITEMS]; /**< Report items array, including all IN, OUT
+ * and FEATURE items.
+ */
+ HID_CollectionPath_t CollectionPaths[HID_MAX_COLLECTIONS]; /**< All collection items, referenced
+ * by the report items.
+ */
+ uint8_t TotalDeviceReports; /**< Number of reports within the HID interface */
+ HID_ReportSizeInfo_t ReportIDSizes[HID_MAX_REPORT_IDS]; /**< Report sizes for each report in the interface */
+ uint16_t LargestReportSizeBits; /**< Largest report that the attached device will generate, in bits */
+ bool UsingReportIDs; /**< Indicates if the device has at least one REPORT ID
+ * element in its HID report descriptor.
+ */
} HID_ReportInfo_t;
/* Function Prototypes: */
/** Extracts the given report item's value out of the given HID report and places it into the Value
* member of the report item's \ref HID_ReportItem_t structure.
*
- * When called on a report with an item that exists in that report, this copies the report item's Value
- * to it's PreviousValue element for easy checking to see if an item's value has changed before processing
+ * When called on a report with an item that exists in that report, this copies the report item's \c Value
+ * to its \c PreviousValue element for easy checking to see if an item's value has changed before processing
* a report. If the given item does not exist in the report, the function does not modify the report item's
* data.
*
bool USB_GetHIDReportItemInfo(const uint8_t* ReportData,
HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
- /** Retrieves the given report item's value out of the Value member of the report item's
+ /** Retrieves the given report item's value out of the \c Value member of the report item's
* \ref HID_ReportItem_t structure and places it into the correct position in the HID report
* buffer. The report buffer is assumed to have the appropriate bits cleared before calling
* this function (i.e., the buffer should be explicitly cleared before report values are added).
*
- * When called, this copies the report item's Value element to it's PreviousValue element for easy
+ * When called, this copies the report item's \c Value element to its \c PreviousValue element for easy
* checking to see if an item's value has changed before sending a report.
*
* If the device has multiple HID reports, the first byte in the report is set to the report ID of the given item.
void USB_SetHIDReportItemInfo(uint8_t* ReportData,
HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
- /** Retrieves the size of a given HID report in bytes from it's Report ID.
+ /** Retrieves the size of a given HID report in bytes from its Report ID.
*
* \param[in] ParserData Pointer to a \ref HID_ReportInfo_t instance containing the parser output.
- * \param[in] ReportID Report ID of the report whose size is to be retrieved.
- * \param[in] ReportType Type of the report whose size is to be determined, a valued from the
+ * \param[in] ReportID Report ID of the report whose size is to be determined.
+ * \param[in] ReportType Type of the report whose size is to be determined, a value from the
* \ref HID_ReportItemTypes_t enum.
*
- * \return Size of the report in bytes, or 0 if the report does not exist.
+ * \return Size of the report in bytes, or \c 0 if the report does not exist.
*/
uint16_t USB_GetHIDReportSize(HID_ReportInfo_t* const ParserData,
const uint8_t ReportID,
projects / pub / USBasp.git / blobdiff