X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/9ea891ea201a3ef897b108c7a9431d36cadfafae..de8c9445d478dc31dab7e042c9c2943d0758bbb3:/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 403d494dc..26f5697d2 100644
--- 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)
 
 		memset(ReportINData, 0, sizeof(ReportINData));
 
-		bool ForceSend = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData, &ReportINSize);
-
-		bool StatesChanged     = (memcmp(ReportINData, HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize) != 0);
+		bool ForceSend         = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportINData, &ReportINSize);
+		bool StatesChanged     = false;
 		bool IdlePeriodElapsed = (HIDInterfaceInfo->State.IdleCount && !(HIDInterfaceInfo->State.IdleMSRemaining));
 		
-		memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, ReportINSize);
+		if (HIDInterfaceInfo->Config.PrevReportINBuffer != NULL)
+		{
+			StatesChanged = (memcmp(ReportINData, HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize) != 0);
+			memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, ReportINSize);
+		}
 
 		if (ReportINSize && (ForceSend || StatesChanged || IdlePeriodElapsed))
 		{