X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/f1199200e167a737a4676378da184387e543830c..cf610c5c91c3eee02dec7ca848acc8da831ad98a:/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c

diff --git a/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c b/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c
index 4d895908e..4d13ce519 100644
--- a/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c
+++ b/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c
@@ -69,3 +69,22 @@ uint8_t GetHIDReportData(void)
 	
 	return ParseSuccessful;
 }
+
+/** Callback for the HID Report Parser. This function is called each time the HID report parser is about to store
+ *  an IN, OUT or FEATURE item into the HIDReportInfo structure. To save on RAM, we are able to filter out items
+ *  we aren't interested in (preventing us from being able to extract them later on, but saving on the RAM they would
+ *  have occupied).
+ *
+ *  \param[in] CurrentItemAttributes  Pointer to the attrbutes of the item the HID report parser is currently working with
+ *
+ *  \return Boolean true if the item should be stored into the HID report structure, false if it should be discarded
+ */
+bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_Attributes_t* CurrentItemAttributes)
+{
+	/* Check the attributes of the current item - see if we are interested in it or not;
+	 * only store BUTTON and GENERIC_DESKTOP_CONTROL items into the Processed HID Report
+	 * structure to save RAM and ignore the rest
+	 */
+	return ((CurrentItemAttributes->Usage.Page == USAGE_PAGE_BUTTON) ||
+	        (CurrentItemAttributes->Usage.Page == USAGE_PAGE_GENERIC_DCTRL));
+}