Fixed USB_GetHIDReportItemInfo() function modifying the given report item's data...

diff --git a/LUFA/Drivers/USB/Class/Host/HIDParser.c b/LUFA/Drivers/USB/Class/Host/HIDParser.c
index 1492112..49f9452 100644 (file)
--- a/LUFA/Drivers/USB/Class/Host/HIDParser.c
+++ b/LUFA/Drivers/USB/Class/Host/HIDParser.c
@@ -276,7 +276,7 @@ uint8_t USB_ProcessHIDReport(const uint8_t* ReportData,
                {
                        UsageMinMax.Minimum = 0;
                        UsageMinMax.Maximum = 0;
-                       UsageListSize   = 0;
+                       UsageListSize       = 0;
                }
        }
        
@@ -292,9 +292,6 @@ bool USB_GetHIDReportItemInfo(const uint8_t* ReportData,
        uint16_t DataBitsRem  = ReportItem->Attributes.BitSize;
        uint16_t CurrentBit   = ReportItem->BitOffset;
        uint32_t BitMask      = (1 << 0);
-
-       ReportItem->PreviousValue = ReportItem->Value;
-       ReportItem->Value = 0;
        
        if (ReportItem->ReportID)
        {
@@ -304,6 +301,9 @@ bool USB_GetHIDReportItemInfo(const uint8_t* ReportData,
                ReportData++;
        }
 
+       ReportItem->PreviousValue = ReportItem->Value;
+       ReportItem->Value = 0;
+
        while (DataBitsRem--)
        {
                if (ReportData[CurrentBit / 8] & (1 << (CurrentBit % 8)))

diff --git a/LUFA/Drivers/USB/Class/Host/HIDParser.h b/LUFA/Drivers/USB/Class/Host/HIDParser.h
index 5f8fa37..f772fed 100644 (file)
--- a/LUFA/Drivers/USB/Class/Host/HIDParser.h
+++ b/LUFA/Drivers/USB/Class/Host/HIDParser.h
@@ -285,8 +285,10 @@
                        /** 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, this copies the report item's Value element to it's PreviousValue element for easy
-                        *  checking to see if an item's value has changed before processing a report.
+                        *  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
+                        *  a report. If the given item does not exist in the report, the function does not modify the report item's
+                        *  data.
                         *
                         *  \param[in]     ReportData  Buffer containing an IN or FEATURE report from an attached device.
                         *  \param[in,out] ReportItem  Pointer to the report item of interest in a \ref HID_ReportInfo_t ReportItem array.

diff --git a/LUFA/ManPages/ChangeLog.txt b/LUFA/ManPages/ChangeLog.txt
index bdbfd4a..999959f 100644 (file)
--- a/LUFA/ManPages/ChangeLog.txt
+++ b/LUFA/ManPages/ChangeLog.txt
@@ -13,6 +13,10 @@
   *    with basic code
   *  - Changed over all device demos to use a clearer algorithm for the configuring of the application's endpoints
   *
+  *  <b>Fixed:</b>
+  *  - Fixed USB_GetHIDReportItemInfo() function modifying the given report item's data when the report item does not exist
+  *    within the supplied report of a multiple report HID device
+  *
   *  \section Sec_ChangeLog100807 Version 100807
   *  <b>New:</b>
   *  - Added new ADC_DisableChannel() function (thanks to Mich Davis)