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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.

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This commit is contained in:
Dean Camera 2009-09-02 07:16:52 +00:00
parent ecf7c18cf2
commit 205b35d131
9 changed files with 107 additions and 65 deletions
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24
Demos/Host/LowLevel/MouseHostWithParser/HIDReport.c
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@ -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;
}
}