Make HID device class driver ignore the previous HID report comparison buffer when...

[pub/USBasp.git] / LUFA / Drivers / USB / Class / Device / HID.c

diff --git a/LUFA/Drivers/USB/Class/Device/HID.c b/LUFA/Drivers/USB/Class/Device/HID.c
index 403d494..26f5697 100644 (file)
--- a/LUFA/Drivers/USB/Class/Device/HID.c
+++ b/LUFA/Drivers/USB/Class/Device/HID.c
@@ -157,12 +157,15 @@ void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
 \r
                memset(ReportINData, 0, sizeof(ReportINData));\r
 \r
-               bool ForceSend = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData, &ReportINSize);\r
-\r
-               bool StatesChanged     = (memcmp(ReportINData, HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize) != 0);\r
+               bool ForceSend         = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData, &ReportINSize);\r
+               bool StatesChanged     = false;\r
                bool IdlePeriodElapsed = (HIDInterfaceInfo->State.IdleCount && !(HIDInterfaceInfo->State.IdleMSRemaining));\r
                \r
-               memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, ReportINSize);\r
+               if (HIDInterfaceInfo->Config.PrevReportINBuffer != NULL)\r
+               {\r
+                       StatesChanged = (memcmp(ReportINData, HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize) != 0);\r
+                       memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, ReportINSize);\r
+               }\r
 \r
                if (ReportINSize && (ForceSend || StatesChanged || IdlePeriodElapsed))\r
                {\r