diff options
Diffstat (limited to 'LUFA/Drivers/USB')
| -rw-r--r-- | LUFA/Drivers/USB/Class/Host/HIDParser.c | 8 | ||||
| -rw-r--r-- | LUFA/Drivers/USB/Class/Host/HIDParser.h | 6 |
2 files changed, 8 insertions, 6 deletions
diff --git a/LUFA/Drivers/USB/Class/Host/HIDParser.c b/LUFA/Drivers/USB/Class/Host/HIDParser.c index 1492112aa..49f9452ba 100644 --- 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 5f8fa374f..f772fed20 100644 --- 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. |