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| author | Dean Camera <dean@fourwalledcubicle.com> | 2009-09-02 07:16:52 +0000 |
|---|---|---|
| committer | Dean Camera <dean@fourwalledcubicle.com> | 2009-09-02 07:16:52 +0000 |
| commit | 205b35d131a1cc8196786de4370cb90fec17835e (patch) | |
| tree | e7b8e03e03a3f8fafa8a19997547a4772674d1a9 /Demos/Host/LowLevel/MouseHostWithParser | |
| parent | ecf7c18cf24a10df8d843c8f7c195d803e073330 (diff) | |
| download | lufa-205b35d131a1cc8196786de4370cb90fec17835e.tar.gz lufa-205b35d131a1cc8196786de4370cb90fec17835e.tar.bz2 lufa-205b35d131a1cc8196786de4370cb90fec17835e.zip | |
Add user-filtering to the HID report parser, so that the user code can decide which items are to be stored into the HID_ReportInfo_t structure and which should be discarded to save on RAM usage.
Diffstat (limited to 'Demos/Host/LowLevel/MouseHostWithParser')
| -rw-r--r-- | Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c | 24 | ||||
| -rw-r--r-- | Demos/Host/LowLevel/MouseHostWithParser/HIDReport.h | 2 |
2 files changed, 26 insertions, 0 deletions
diff --git a/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c b/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c index 4d895908e..41abcb221 100644 --- a/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c +++ b/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c @@ -69,3 +69,27 @@ 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 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 */
+ if ((CurrentItemAttributes->Usage.Page == USAGE_PAGE_BUTTON) ||
+ (CurrentItemAttributes->Usage.Page == USAGE_PAGE_GENERIC_DCTRL))
+ {
+ /* Only store BUTTON and GENERIC_DESKTOP_CONTROL items into the Processed HID Report structure to save RAM */
+ return true;
+ }
+ else
+ {
+ return false;
+ }
+}
diff --git a/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.h b/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.h index f5429f0a9..ae6871c57 100644 --- a/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.h +++ b/Demos/Host/LowLevel/MouseHostWithParser/HIDReport.h @@ -86,4 +86,6 @@ /* Function Prototypes: */
uint8_t GetHIDReportData(void);
+ bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_Attributes_t* CurrentItemAttributes);
+
#endif
|