Changed all Device mode LowLevel demos and Device Class drivers so that the control request is acknowledged and any data transferred as quickly as possible without any processing inbetween sections, so that long callbacks or event handlers will not break communications with the host by exceeding the maximum control request stage timeout period.

Demos/Device/Incomplete/TestAndMeasurement/TestAndMeasurement.c

@@ -146,8 +146,6 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_InitiateAbortBulkOut:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT))
 			{
-				Endpoint_ClearSETUP();
-				
 				/* Check that no split transaction is already in progress and the data transfer tag is valid */
 				if (RequestInProgress != 0)
 				{
@@ -165,6 +163,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 					/* Save the split request for later checking when a new request is received */
 					RequestInProgress = Req_InitiateAbortBulkOut;
 				}
+
+				Endpoint_ClearSETUP();
 				
 				/* Write the request response byte */
 				Endpoint_Write_Byte(TMCRequestStatus);
@@ -177,16 +177,16 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_CheckAbortBulkOutStatus:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT))
 			{
-				Endpoint_ClearSETUP();
-				
 				/* Check that an ABORT BULK OUT transaction has been requested and that the request has completed */
 				if (RequestInProgress != Req_InitiateAbortBulkOut)
 				  TMCRequestStatus = TMC_STATUS_SPLIT_NOT_IN_PROGRESS;				
 				else if (IsTMCBulkOUTReset)
 				  TMCRequestStatus = TMC_STATUS_PENDING;
 				else
-				  RequestInProgress = 0;			
+				  RequestInProgress = 0;	
-				
+
+				Endpoint_ClearSETUP();
+								
 				/* Write the request response bytes */
 				Endpoint_Write_Byte(TMCRequestStatus);
 				Endpoint_Write_Word_LE(0);
@@ -200,8 +200,6 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_InitiateAbortBulkIn:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT))
 			{
-				Endpoint_ClearSETUP();
-				
 				/* Check that no split transaction is already in progress and the data transfer tag is valid */
 				if (RequestInProgress != 0)
 				{
@@ -219,6 +217,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 					/* Save the split request for later checking when a new request is received */
 					RequestInProgress = Req_InitiateAbortBulkIn;
 				}
+
+				Endpoint_ClearSETUP();
 				
 				/* Write the request response bytes */
 				Endpoint_Write_Byte(TMCRequestStatus);
@@ -232,8 +232,6 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_CheckAbortBulkInStatus:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT))
 			{
-				Endpoint_ClearSETUP();
-				
 				/* Check that an ABORT BULK IN transaction has been requested and that the request has completed */
 				if (RequestInProgress != Req_InitiateAbortBulkIn)
 				  TMCRequestStatus = TMC_STATUS_SPLIT_NOT_IN_PROGRESS;
@@ -241,7 +239,9 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				  TMCRequestStatus = TMC_STATUS_PENDING;
 				else
 				  RequestInProgress = 0;
-				
+
+				Endpoint_ClearSETUP();
+								
 				/* Write the request response bytes */
 				Endpoint_Write_Byte(TMCRequestStatus);
 				Endpoint_Write_Word_LE(0);
@@ -255,8 +255,6 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_InitiateClear:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();
-				
 				/* Check that no split transaction is already in progress */
 				if (RequestInProgress != 0)
 				{
@@ -271,6 +269,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 					/* Save the split request for later checking when a new request is received */
 					RequestInProgress = Req_InitiateClear;
 				}
+
+				Endpoint_ClearSETUP();
 				
 				/* Write the request response byte */
 				Endpoint_Write_Byte(TMCRequestStatus);
@@ -283,8 +283,6 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_CheckClearStatus:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();
-				
 				/* Check that a CLEAR transaction has been requested and that the request has completed */
 				if (RequestInProgress != Req_InitiateClear)
 				  TMCRequestStatus = TMC_STATUS_SPLIT_NOT_IN_PROGRESS;				
@@ -292,7 +290,9 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				  TMCRequestStatus = TMC_STATUS_PENDING;
 				else
 				  RequestInProgress = 0;
-				
+
+				Endpoint_ClearSETUP();
+
 				/* Write the request response bytes */
 				Endpoint_Write_Byte(TMCRequestStatus);
 				Endpoint_Write_Byte(0);
@@ -305,13 +305,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case Req_GetCapabilities:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
 					
 				/* Write the device capabilities to the control endpoint */
-				Endpoint_Write_Control_Stream_LE(&Capabilities, sizeof(TMC_Capabilities_t));
+				Endpoint_Write_Control_Stream_LE(&Capabilities, sizeof(TMC_Capabilities_t));				
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 			}
 			

Demos/Device/LowLevel/AudioInput/AudioInput.c

@@ -133,12 +133,11 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			/* Set Interface is not handled by the library, as its function is application-specific */
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();
+				Endpoint_ClearSETUP();				
-				
+				Endpoint_ClearStatusStage();
+
 				/* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
 				StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0);
-				
-				Endpoint_ClearStatusStage();
 			}
 
 			break;

Demos/Device/LowLevel/AudioOutput/AudioOutput.c

@@ -161,11 +161,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-				
+				Endpoint_ClearStatusStage();
+
 				/* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
 				StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0);
-				
-				Endpoint_ClearStatusStage();
 			}
 
 			break;

Demos/Device/LowLevel/DualVirtualSerial/DualVirtualSerial.c

@@ -161,13 +161,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_GetLineEncoding:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{	
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
 
 				/* Write the line coding data to the control endpoint */
-				Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));
+				Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));				
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 			}
 			
@@ -175,13 +172,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_SetLineEncoding:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
 
 				/* Read the line coding data in from the host into the global struct */
 				Endpoint_Read_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));
-
-				/* Finalize the stream transfer to clear the last packet from the host */
 				Endpoint_ClearIN();
 			}
 	
@@ -189,9 +183,7 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_SetControlLineState:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
-				
 				Endpoint_ClearStatusStage();
 			}
 	

Demos/Device/LowLevel/GenericHID/GenericHID.c

@@ -120,15 +120,12 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				uint8_t GenericData[GENERIC_REPORT_SIZE];
+				CreateGenericHIDReport(GenericData);
 
 				Endpoint_ClearSETUP();
-	
-				CreateGenericHIDReport(GenericData);
 
 				/* Write the report data to the control endpoint */
 				Endpoint_Write_Control_Stream_LE(&GenericData, sizeof(GenericData));
-
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 			}
 		
@@ -139,30 +136,12 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				uint8_t GenericData[GENERIC_REPORT_SIZE];
 
 				Endpoint_ClearSETUP();
-				
-				/* Wait until the generic report has been sent by the host */
-				while (!(Endpoint_IsOUTReceived()))
-				{
-					if (USB_DeviceState == DEVICE_STATE_Unattached)
-					  return;
-				}
 
+				/* Read the report data from the control endpoint */
 				Endpoint_Read_Control_Stream_LE(&GenericData, sizeof(GenericData));
-
-				ProcessGenericHIDReport(GenericData);
-			
-				/* Clear the endpoint data */
 				Endpoint_ClearOUT();
 
-				/* Wait until the host is ready to receive the request confirmation */
+				ProcessGenericHIDReport(GenericData);
-				while (!(Endpoint_IsINReady()))
-				{
-					if (USB_DeviceState == DEVICE_STATE_Unattached)
-					  return;
-				}
-				
-				/* Handshake the request by sending an empty IN packet */
-				Endpoint_ClearIN();
 			}
 			
 			break;

Demos/Device/LowLevel/Joystick/Joystick.c

@@ -117,15 +117,13 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			{
 				USB_JoystickReport_Data_t JoystickReportData;
 				
-				Endpoint_ClearSETUP();
-
 				/* Create the next HID report to send to the host */				
 				GetNextReport(&JoystickReportData);
-					
+
+				Endpoint_ClearSETUP();
+
 				/* Write the report data to the control endpoint */
 				Endpoint_Write_Control_Stream_LE(&JoystickReportData, sizeof(JoystickReportData));
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 			}
 		

Demos/Device/LowLevel/Keyboard/Keyboard.c

@@ -143,15 +143,13 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			{
 				USB_KeyboardReport_Data_t KeyboardReportData;
 
-				Endpoint_ClearSETUP();
-	
 				/* Create the next keyboard report for transmission to the host */
 				CreateKeyboardReport(&KeyboardReportData);
 
+				Endpoint_ClearSETUP();
+
 				/* Write the report data to the control endpoint */
 				Endpoint_Write_Control_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 			}
 		
@@ -171,13 +169,11 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				/* Read in the LED report from the host */
 				uint8_t LEDStatus = Endpoint_Read_Byte();
 
-				/* Process the incoming LED report */
-				ProcessLEDReport(LEDStatus);
-			
-				/* Clear the endpoint data */
 				Endpoint_ClearOUT();
-
 				Endpoint_ClearStatusStage();
+
+				/* Process the incoming LED report */
+				ProcessLEDReport(LEDStatus);
 			}
 			
 			break;
@@ -188,10 +184,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				
 				/* Write the current protocol flag to the host */
 				Endpoint_Write_Byte(UsingReportProtocol);
-				
-				/* Send the flag to the host */
-				Endpoint_ClearIN();
 
+				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();
 			}
 			
@@ -200,23 +194,21 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+				Endpoint_ClearStatusStage();
 
 				/* Set or clear the flag depending on what the host indicates that the current Protocol should be */
 				UsingReportProtocol = (USB_ControlRequest.wValue != 0);
-
-				Endpoint_ClearStatusStage();
 			}
 			
 			break;
 		case REQ_SetIdle:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();
+				Endpoint_ClearSETUP();				
-				
+				Endpoint_ClearStatusStage();
+
 				/* Get idle period in MSB, IdleCount must be multiplied by 4 to get number of milliseconds */
 				IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);
-				
-				Endpoint_ClearStatusStage();
 			}
 			
 			break;
@@ -226,11 +218,9 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				Endpoint_ClearSETUP();
 				
 				/* Write the current idle duration to the host, must be divided by 4 before sent to host */
-				Endpoint_Write_Byte(IdleCount >> 2);
+				Endpoint_Write_Byte(IdleCount >> 2);				
-				
-				/* Send the flag to the host */
-				Endpoint_ClearIN();
 
+				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();
 			}
 

Demos/Device/LowLevel/KeyboardMouse/KeyboardMouse.c

@@ -148,12 +148,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 
 				/* Write the report data to the control endpoint */
 				Endpoint_Write_Control_Stream_LE(ReportData, ReportSize);
+				Endpoint_ClearOUT();
 
 				/* Clear the report data afterwards */
 				memset(ReportData, 0, ReportSize);
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
-				Endpoint_ClearOUT();
 			}
 		
 			break;
@@ -169,13 +167,14 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 					  return;
 				}
 
-				/* Read in and process the LED report from the host */
+				/* Read in the LED report from the host */
-				Keyboard_ProcessLEDReport(Endpoint_Read_Byte());
+				uint8_t LEDStatus = Endpoint_Read_Byte();
 
-				/* Clear the endpoint data */
 				Endpoint_ClearOUT();
-
 				Endpoint_ClearStatusStage();
+
+				/* Process the incoming LED report */
+				Keyboard_ProcessLEDReport(LEDStatus);
 			}
 			
 			break;

Demos/Device/LowLevel/MassStorage/MassStorage.c

@@ -133,11 +133,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+				Endpoint_ClearStatusStage();
 
 				/* Indicate that the current transfer should be aborted */
 				IsMassStoreReset = true;
-
-				Endpoint_ClearStatusStage();
 			}
 
 			break;
@@ -149,8 +148,7 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				/* Indicate to the host the number of supported LUNs (virtual disks) on the device */
 				Endpoint_Write_Byte(TOTAL_LUNS - 1);
 				
-				Endpoint_ClearIN();
+				Endpoint_ClearIN();				
-				
 				Endpoint_ClearStatusStage();
 			}
 			

Demos/Device/LowLevel/Mouse/Mouse.c

@@ -140,19 +140,17 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			{
 				USB_MouseReport_Data_t MouseReportData;
 
-				Endpoint_ClearSETUP();
-
 				/* Create the next mouse report for transmission to the host */
 				CreateMouseReport(&MouseReportData);
-	
+
+				Endpoint_ClearSETUP();
+
 				/* Write the report data to the control endpoint */
 				Endpoint_Write_Control_Stream_LE(&MouseReportData, sizeof(MouseReportData));
-				
+				Endpoint_ClearOUT();
+
 				/* Clear the report data afterwards */
 				memset(&MouseReportData, 0, sizeof(MouseReportData));
-
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
-				Endpoint_ClearOUT();
 			}
 		
 			break;
@@ -164,9 +162,7 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				/* Write the current protocol flag to the host */
 				Endpoint_Write_Byte(UsingReportProtocol);
 				
-				/* Send the flag to the host */
 				Endpoint_ClearIN();
-
 				Endpoint_ClearStatusStage();
 			}
 			
@@ -175,11 +171,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-				
+				Endpoint_ClearStatusStage();
+
 				/* Set or clear the flag depending on what the host indicates that the current Protocol should be */
 				UsingReportProtocol = (USB_ControlRequest.wValue != 0);
-				
-				Endpoint_ClearStatusStage();
 			}
 			
 			break;
@@ -187,11 +182,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-				
+				Endpoint_ClearStatusStage();
+
 				/* Get idle period in MSB, must multiply by 4 to get the duration in milliseconds */
 				IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);
-				
-				Endpoint_ClearStatusStage();
 			}
 			
 			break;
@@ -202,10 +196,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 				
 				/* Write the current idle duration to the host, must be divided by 4 before sent to host */
 				Endpoint_Write_Byte(IdleCount >> 2);
-				
-				/* Send the flag to the host */
-				Endpoint_ClearIN();
 
+				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();
 			}
 

Demos/Device/LowLevel/RNDISEthernet/RNDISEthernet.c

@@ -124,13 +124,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_SendEncapsulatedCommand:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Clear the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
 				
 				/* Read in the RNDIS message into the message buffer */
 				Endpoint_Read_Control_Stream_LE(RNDISMessageBuffer, USB_ControlRequest.wLength);
-
-				/* Finalize the stream transfer to clear the last packet from the host */
 				Endpoint_ClearIN();
 
 				/* Process the RNDIS message */
@@ -141,9 +138,6 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_GetEncapsulatedResponse:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Clear the SETUP packet, ready for data transfer */
-				Endpoint_ClearSETUP();
-				
 				/* Check if a response to the last message is ready */
 				if (!(MessageHeader->MessageLength))
 				{
@@ -152,10 +146,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 					MessageHeader->MessageLength = 1;
 				}
 
+				Endpoint_ClearSETUP();
+				
 				/* Write the message response data to the endpoint */
 				Endpoint_Write_Control_Stream_LE(RNDISMessageBuffer, MessageHeader->MessageLength);
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 
 				/* Reset the message header once again after transmission */

Demos/Device/LowLevel/VirtualSerial/VirtualSerial.c

@@ -134,13 +134,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_GetLineEncoding:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{	
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
 
 				/* Write the line coding data to the control endpoint */
 				Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
-				
-				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
 			}
 			
@@ -148,13 +145,10 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_SetLineEncoding:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
 
 				/* Read the line coding data in from the host into the global struct */
 				Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
-
-				/* Finalize the stream transfer to clear the last packet from the host */
 				Endpoint_ClearIN();
 			}
 	
@@ -162,15 +156,13 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 		case REQ_SetControlLineState:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				/* Acknowledge the SETUP packet, ready for data transfer */
 				Endpoint_ClearSETUP();
-				
+				Endpoint_ClearStatusStage();
+
 				/* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
 				         lines. The mask is read in from the wValue parameter in USB_ControlRequest, and can be masked against the
 						 CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
 				*/
-				
-				Endpoint_ClearStatusStage();
 			}
 	
 			break;

LUFA/Drivers/USB/Class/Device/Audio.c

@@ -49,10 +49,9 @@ void Audio_Device_ProcessControlRequest(USB_ClassInfo_Audio_Device_t* const Audi
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-				
-				AudioInterfaceInfo->State.InterfaceEnabled = ((USB_ControlRequest.wValue & 0xFF) != 0);
-				  
 				Endpoint_ClearStatusStage();
+
+				AudioInterfaceInfo->State.InterfaceEnabled = ((USB_ControlRequest.wValue & 0xFF) != 0);
 			}
 
 			break;

LUFA/Drivers/USB/Class/Device/CDC.c

@@ -64,7 +64,6 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-
 				Endpoint_Read_Control_Stream_LE(&CDCInterfaceInfo->State.LineEncoding, sizeof(CDCInterfaceInfo->State.LineEncoding));
 				Endpoint_ClearIN();
 
@@ -75,12 +74,11 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInter
 		case REQ_SetControlLineState:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{				
-				Endpoint_ClearSETUP();				
+				Endpoint_ClearSETUP();
+				Endpoint_ClearStatusStage();
 
 				CDCInterfaceInfo->State.ControlLineStates.HostToDevice = USB_ControlRequest.wValue;
 
-				Endpoint_ClearStatusStage();
-
 				EVENT_CDC_Device_ControLineStateChanged(CDCInterfaceInfo);
 			}
 	

LUFA/Drivers/USB/Class/Device/HID.c

@@ -48,8 +48,6 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 		case REQ_GetReport:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();	
-
 				uint16_t ReportSize = 0;
 				uint8_t  ReportID   = (USB_ControlRequest.wValue & 0xFF);
 				uint8_t  ReportType = (USB_ControlRequest.wValue >> 8) - 1;
@@ -62,6 +60,7 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 				if (HIDInterfaceInfo->Config.PrevReportINBuffer != NULL)
 				  memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportData, HIDInterfaceInfo->Config.PrevReportINBufferSize);
 
+				Endpoint_ClearSETUP();
 				Endpoint_SelectEndpoint(ENDPOINT_CONTROLEP);
 				Endpoint_Write_Control_Stream_LE(ReportData, ReportSize);
 				Endpoint_ClearOUT();
@@ -71,16 +70,16 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 		case REQ_SetReport:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();
-				
 				uint16_t ReportSize = USB_ControlRequest.wLength;
 				uint8_t  ReportID   = (USB_ControlRequest.wValue & 0xFF);
 				uint8_t  ReportType = (USB_ControlRequest.wValue >> 8) - 1;
 				uint8_t  ReportData[ReportSize];
 
+				Endpoint_ClearSETUP();
 				Endpoint_Read_Control_Stream_LE(ReportData, ReportSize);
-				CALLBACK_HID_Device_ProcessHIDReport(HIDInterfaceInfo, ReportID, ReportType, ReportData, ReportSize);
 				Endpoint_ClearIN();				
+
+				CALLBACK_HID_Device_ProcessHIDReport(HIDInterfaceInfo, ReportID, ReportType, ReportData, ReportSize);
 			}
 			
 			break;
@@ -88,10 +87,8 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-
 				Endpoint_Write_Byte(HIDInterfaceInfo->State.UsingReportProtocol);
 				Endpoint_ClearIN();
-
 				Endpoint_ClearStatusStage();
 			}
 			
@@ -100,10 +97,9 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-
-				HIDInterfaceInfo->State.UsingReportProtocol = ((USB_ControlRequest.wValue & 0xFF) != 0x00);
-				
 				Endpoint_ClearStatusStage();
+
+				HIDInterfaceInfo->State.UsingReportProtocol = ((USB_ControlRequest.wValue & 0xFF) != 0x00);				
 			}
 			
 			break;
@@ -111,10 +107,9 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-					
-				HIDInterfaceInfo->State.IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);
-					
 				Endpoint_ClearStatusStage();
+
+				HIDInterfaceInfo->State.IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);
 			}
 			
 			break;
@@ -122,10 +117,8 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{		
 				Endpoint_ClearSETUP();
-				
 				Endpoint_Write_Byte(HIDInterfaceInfo->State.IdleCount >> 2);
 				Endpoint_ClearIN();
-
 				Endpoint_ClearStatusStage();
 			}
 

LUFA/Drivers/USB/Class/Device/MassStorage.c

@@ -52,10 +52,9 @@ void MS_Device_ProcessControlRequest(USB_ClassInfo_MS_Device_t* const MSInterfac
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-
-				MSInterfaceInfo->State.IsMassStoreReset = true;			
-
 				Endpoint_ClearStatusStage();
+
+				MSInterfaceInfo->State.IsMassStoreReset = true;
 			}
 
 			break;
@@ -63,10 +62,8 @@ void MS_Device_ProcessControlRequest(USB_ClassInfo_MS_Device_t* const MSInterfac
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-
 				Endpoint_Write_Byte(MSInterfaceInfo->Config.TotalLUNs - 1);				
-				Endpoint_ClearIN();
+				Endpoint_ClearIN();				
-				
 				Endpoint_ClearStatusStage();
 			}
 			

LUFA/Drivers/USB/Class/Device/RNDIS.c

@@ -81,7 +81,6 @@ void RNDIS_Device_ProcessControlRequest(USB_ClassInfo_RNDIS_Device_t* const RNDI
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
-
 				Endpoint_Read_Control_Stream_LE(RNDISInterfaceInfo->State.RNDISMessageBuffer, USB_ControlRequest.wLength);
 				Endpoint_ClearIN();
 
@@ -92,8 +91,6 @@ void RNDIS_Device_ProcessControlRequest(USB_ClassInfo_RNDIS_Device_t* const RNDI
 		case REQ_GetEncapsulatedResponse:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
-				Endpoint_ClearSETUP();
-
 				RNDIS_Message_Header_t* MessageHeader = (RNDIS_Message_Header_t*)&RNDISInterfaceInfo->State.RNDISMessageBuffer;
 
 				if (!(MessageHeader->MessageLength))
@@ -102,6 +99,7 @@ void RNDIS_Device_ProcessControlRequest(USB_ClassInfo_RNDIS_Device_t* const RNDI
 					MessageHeader->MessageLength = 1;
 				}
 
+				Endpoint_ClearSETUP();
 				Endpoint_Write_Control_Stream_LE(RNDISInterfaceInfo->State.RNDISMessageBuffer, MessageHeader->MessageLength);				
 				Endpoint_ClearOUT();
 

LUFA/ManPages/ChangeLog.txt

@@ -20,8 +20,9 @@
   *    SCSI_Codes.h file as these values are part of the MassStorage Class Driver
   *  - Added compile time error to the AVRISP-MKII project when built for the U4 chips, as the default VTARGET detection ADC channel
   *    does not exist on these chips (thanks to Marco)
-  *  - Moved calls to Device mode Class Driver events to after the request has been acknowledged, so that long event handlers do
+  *  - Changed all Device mode LowLevel demos and Device Class drivers so that the control request is acknowledged and any data
-  *    do skew the timing of the control requests
+  *    transferred as quickly as possible without any processing inbetween sections, so that long callbacks or event handlers will
+  *    not break communications with the host by exceeding the maximum control request stage timeout period
   *
   *  <b>Fixed:</b>
   *  - Fixed USB_GetHIDReportItemInfo() function modifying the given report item's data when the report item does not exist