diff options
Diffstat (limited to 'LUFA/Drivers/USB/Class/Host/HIDParser.h')
| -rw-r--r-- | LUFA/Drivers/USB/Class/Host/HIDParser.h | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/LUFA/Drivers/USB/Class/Host/HIDParser.h b/LUFA/Drivers/USB/Class/Host/HIDParser.h index ec7ff53be..8d3fbf212 100644 --- a/LUFA/Drivers/USB/Class/Host/HIDParser.h +++ b/LUFA/Drivers/USB/Class/Host/HIDParser.h @@ -46,16 +46,11 @@ * Functions, macros, variables, enums and types related to the parsing of HID class device report descriptors.
*
* The processed HID report is presented back to the user application as a flat structure containing each report
- * item's IN, OUT and FEATURE (if desired) items along with each item's attributes.
+ * item's IN, OUT and FEATURE items along with each item's attributes.
*
* 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.
*
- * By default, FEATURE reports and IN/OUT reports with constant data are ignored in the HID report when processed
- * to save on memory. This can be overridden by defining the HID_ENABLE_FEATURE_PROCESSING or
- * HID_INCLUDE_CONSTANT_DATA_ITEMS tokens in the user project makefile, passing them to the compiler via the -D
- * switch.
- *
* @{
*/
@@ -108,13 +103,13 @@ #endif
#if !defined(HID_MAX_REPORTITEMS) || defined(__DOXYGEN__)
- /** Constant indicating the maximum number of report items (IN, OUT or FEATURE if enabled) that can be
- * processed in the report item descriptor. A large value allows for more report items to be
- * processed, but consumes more memory. By default this is set to 30 items, but this can be
- * overridden by defining HID_MAX_REPORTITEMS to another value in the user project makefile, passing
- * the define to the compiler using the -D compiler switch.
+ /** Constant indicating the maximum number of report items (IN, OUT or FEATURE) that can be processed
+ * in the report item descriptor and stored in the user HID Report Info structure. A large value allows
+ * for more report items to be stored, but consumes more memory. By default this is set to 20 items,
+ * but this can be overridden by defining HID_MAX_REPORTITEMS to another value in the user project
+ * makefile, passing the define to the compiler using the -D compiler switch.
*/
- #define HID_MAX_REPORTITEMS 30
+ #define HID_MAX_REPORTITEMS 20
#endif
/* Public Interface - May be used in end-application: */
@@ -250,6 +245,17 @@ */
void USB_SetHIDReportItemInfo(uint8_t* ReportData, const HID_ReportItem_t* ReportItem)
ATTR_NON_NULL_PTR_ARG(1, 2);
+
+ /** Callback routine for the HID Report Parser. This callback <b>must</b> be implemented by the user code when
+ * the parser is used, to determine what report IN, OUT and FEATURE item's information is stored into the user
+ * HID_ReportInfo_t structure. This can be used to filter only those items the application will be using, so that
+ * no RAM is wasted storing the attributes for report items which will never be referenced by the application.
+ *
+ * \param CurrentItemAttributes Pointer to the current report item attributes for user checking
+ *
+ * \return Boolean true if the item should be stored into the HID_ReportInfo_t structure, false if it should be ignored
+ */
+ bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_Attributes_t* CurrentItemAttributes);
/* Private Interface - For use in library only: */
#if !defined(__DOXYGEN__)
|