Added new USB_DeviceState variable to keep track of the current Device mode USB state.

Added new Endpoint_ClearStatusStage() convenience function to assist with the status stages of control transfers.

Removed vague USB_IsConnected global - test USB_DeviceState or USB_HostState explicitly to gain previous functionality.

Removed USB_IsSuspended global - test USB_DeviceState against DEVICE_STATE_Suspended instead.

Fixed possible enumeration errors from spinloops which may fail to exit if the USB connection is severed before the exit condition becomes true.

23 files changed, 292 insertions, 160 deletions

diff --git a/LUFA/Drivers/USB/Class/Device/Audio.c b/LUFA/Drivers/USB/Class/Device/Audio.c
index d117bedf6..116921e6e 100644
--- a/LUFA/Drivers/USB/Class/Device/Audio.c
+++ b/LUFA/Drivers/USB/Class/Device/Audio.c
@@ -50,8 +50,7 @@ void Audio_Device_ProcessControlPacket(USB_ClassInfo_Audio_Device_t* const Audio
 				

 				AudioInterfaceInfo->State.InterfaceEnabled = (USB_ControlRequest.wValue != 0);

 				  

-				while (!(Endpoint_IsINReady()));

-				Endpoint_ClearIN();

+				Endpoint_ClearStatusStage();

 			}

 

 			break;

diff --git a/LUFA/Drivers/USB/Class/Device/CDC.c b/LUFA/Drivers/USB/Class/Device/CDC.c
index 12b55938c..237e1dd2f 100644
--- a/LUFA/Drivers/USB/Class/Device/CDC.c
+++ b/LUFA/Drivers/USB/Class/Device/CDC.c
@@ -78,8 +78,7 @@ void CDC_Device_ProcessControlPacket(USB_ClassInfo_CDC_Device_t* CDCInterfaceInf
 				

 				EVENT_CDC_Device_ControLineStateChanged(CDCInterfaceInfo);

 

-				while (!(Endpoint_IsINReady()));

-				Endpoint_ClearIN();

+				Endpoint_ClearStatusStage();

 			}

 	

 			break;

@@ -114,7 +113,7 @@ bool CDC_Device_ConfigureEndpoints(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
 

 void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)

 {

-	if (!(USB_IsConnected) || !(USB_ConfigurationNumber))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);

@@ -125,7 +124,12 @@ void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
 	if (!(Endpoint_IsReadWriteAllowed()))

 	{

 		Endpoint_ClearIN();

-		while (!(Endpoint_IsReadWriteAllowed()));

+

+		while (!(Endpoint_IsReadWriteAllowed()))

+		{

+			if (USB_DeviceState == DEVICE_STATE_Unattached)

+			  return;

+		}

 	}	

 	

 	Endpoint_ClearIN();

@@ -133,7 +137,7 @@ void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
 

 void CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length)

 {

-	if (!(USB_IsConnected))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);

@@ -142,7 +146,7 @@ void CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, c
 

 void CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data)

 {

-	if (!(USB_IsConnected))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);

@@ -150,7 +154,12 @@ void CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, con
 	if (!(Endpoint_IsReadWriteAllowed()))

 	{

 		Endpoint_ClearIN();

-		while (!(Endpoint_IsReadWriteAllowed()));

+		

+		while (!(Endpoint_IsReadWriteAllowed()))

+		{

+			if (USB_DeviceState == DEVICE_STATE_Unattached)

+			  return;		

+		}

 	}

 

 	Endpoint_Write_Byte(Data);	

@@ -165,7 +174,7 @@ uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterface
 

 uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)

 {

-	if (!(USB_IsConnected))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return 0;

 

 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);

@@ -180,7 +189,7 @@ uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
 

 void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)

 {

-	if (!(USB_IsConnected))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.NotificationEndpointNumber);

diff --git a/LUFA/Drivers/USB/Class/Device/HID.c b/LUFA/Drivers/USB/Class/Device/HID.c
index 4a6295ab0..f292c633e 100644
--- a/LUFA/Drivers/USB/Class/Device/HID.c
+++ b/LUFA/Drivers/USB/Class/Device/HID.c
@@ -88,8 +88,7 @@ void HID_Device_ProcessControlPacket(USB_ClassInfo_HID_Device_t* const HIDInterf
 				Endpoint_Write_Byte(HIDInterfaceInfo->State.UsingReportProtocol);

 				Endpoint_ClearIN();

 

-				while (!(Endpoint_IsOUTReceived()));

-				Endpoint_ClearOUT();

+				Endpoint_ClearStatusStage();

 			}

 			

 			break;

@@ -100,8 +99,7 @@ void HID_Device_ProcessControlPacket(USB_ClassInfo_HID_Device_t* const HIDInterf
 

 				HIDInterfaceInfo->State.UsingReportProtocol = (USB_ControlRequest.wValue != 0x0000);

 				

-				while (!(Endpoint_IsINReady()));

-				Endpoint_ClearIN();

+				Endpoint_ClearStatusStage();

 			}

 			

 			break;

@@ -115,8 +113,7 @@ void HID_Device_ProcessControlPacket(USB_ClassInfo_HID_Device_t* const HIDInterf
 					

 					HIDInterfaceInfo->State.IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);

 					

-					while (!(Endpoint_IsINReady()));

-					Endpoint_ClearIN();

+					Endpoint_ClearStatusStage();

 				}

 			}

 			

@@ -129,8 +126,7 @@ void HID_Device_ProcessControlPacket(USB_ClassInfo_HID_Device_t* const HIDInterf
 				Endpoint_Write_Byte(HIDInterfaceInfo->State.IdleCount >> 2);

 				Endpoint_ClearIN();

 

-				while (!(Endpoint_IsOUTReceived()));

-				Endpoint_ClearOUT();

+				Endpoint_ClearStatusStage();

 			}

 

 			break;

@@ -152,7 +148,7 @@ bool HID_Device_ConfigureEndpoints(USB_ClassInfo_HID_Device_t* const HIDInterfac
 		

 void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)

 {

-	if (!(USB_IsConnected) || !(USB_ConfigurationNumber))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	Endpoint_SelectEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber);

diff --git a/LUFA/Drivers/USB/Class/Device/MIDI.c b/LUFA/Drivers/USB/Class/Device/MIDI.c
index da33bdb61..364327595 100644
--- a/LUFA/Drivers/USB/Class/Device/MIDI.c
+++ b/LUFA/Drivers/USB/Class/Device/MIDI.c
@@ -70,7 +70,7 @@ void MIDI_Device_USBTask(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
 

 void MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)

 {

-	if (!(USB_IsConnected))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 	

 	Endpoint_SelectEndpoint(MIDIInterfaceInfo->Config.DataINEndpointNumber);

@@ -84,7 +84,7 @@ void MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfac
 

 bool MIDI_Device_ReceiveEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)

 {

-	if (!(USB_IsConnected))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return false;

 	

 	Endpoint_SelectEndpoint(MIDIInterfaceInfo->Config.DataOUTEndpointNumber);

diff --git a/LUFA/Drivers/USB/Class/Device/MassStorage.c b/LUFA/Drivers/USB/Class/Device/MassStorage.c
index f7f3fd9f2..9f8688c1d 100644
--- a/LUFA/Drivers/USB/Class/Device/MassStorage.c
+++ b/LUFA/Drivers/USB/Class/Device/MassStorage.c
@@ -53,8 +53,7 @@ void MS_Device_ProcessControlPacket(USB_ClassInfo_MS_Device_t* const MSInterface
 

 				MSInterfaceInfo->State.IsMassStoreReset = true;			

 

-				while (!(Endpoint_IsINReady()));

-				Endpoint_ClearIN();

+				Endpoint_ClearStatusStage();

 			}

 

 			break;

@@ -63,12 +62,10 @@ void MS_Device_ProcessControlPacket(USB_ClassInfo_MS_Device_t* const MSInterface
 			{

 				Endpoint_ClearSETUP();

 

-				Endpoint_Write_Byte(MSInterfaceInfo->Config.TotalLUNs - 1);

-				

+				Endpoint_Write_Byte(MSInterfaceInfo->Config.TotalLUNs - 1);				

 				Endpoint_ClearIN();

 				

-				while (!(Endpoint_IsOUTReceived()));

-				Endpoint_ClearOUT();

+				Endpoint_ClearStatusStage();

 			}

 			

 			break;

@@ -96,7 +93,7 @@ bool MS_Device_ConfigureEndpoints(USB_ClassInfo_MS_Device_t* const MSInterfaceIn
 

 void MS_Device_USBTask(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)

 {

-	if (!(USB_IsConnected) || !(USB_ConfigurationNumber))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);

diff --git a/LUFA/Drivers/USB/Class/Device/RNDIS.c b/LUFA/Drivers/USB/Class/Device/RNDIS.c
index 0d35ee6b4..37771c646 100644
--- a/LUFA/Drivers/USB/Class/Device/RNDIS.c
+++ b/LUFA/Drivers/USB/Class/Device/RNDIS.c
@@ -138,7 +138,7 @@ bool RNDIS_Device_ConfigureEndpoints(USB_ClassInfo_RNDIS_Device_t* const RNDISIn
 

 void RNDIS_Device_USBTask(USB_ClassInfo_RNDIS_Device_t* const RNDISInterfaceInfo)

 {

-	if (!(USB_IsConnected) || !(USB_ConfigurationNumber))

+	if (USB_DeviceState != DEVICE_STATE_Configured)

 	  return;

 

 	RNDIS_Message_Header_t* MessageHeader = (RNDIS_Message_Header_t*)&RNDISInterfaceInfo->State.RNDISMessageBuffer;

diff --git a/LUFA/Drivers/USB/HighLevel/Events.h b/LUFA/Drivers/USB/HighLevel/Events.h
index 2df0dda08..4042d4670 100644
--- a/LUFA/Drivers/USB/HighLevel/Events.h
+++ b/LUFA/Drivers/USB/HighLevel/Events.h
@@ -98,7 +98,7 @@
 			 *        which is not always accurate (host may suspend the bus while still connected). If the actual connection state

 			 *        needs to be determined, VBUS should be routed to an external pin, and the auto-detect behaviour turned off by

 			 *        passing the NO_LIMITED_CONTROLLER_CONNECT token to the compiler via the -D switch at compile time. The connection

-			 *        and disconnection events may be manually fired, and the \ref USB_IsConnected global changed manually.

+			 *        and disconnection events may be manually fired, and the \ref USB_DeviceState global changed manually.

 			 *

 			 *  \see USBTask.h for more information on the USB management task and reducing CPU usage.

 			 */

@@ -116,7 +116,7 @@
 			 *        which is not always accurate (host may suspend the bus while still connected). If the actual connection state

 			 *        needs to be determined, VBUS should be routed to an external pin, and the auto-detect behaviour turned off by

 			 *        passing the NO_LIMITED_CONTROLLER_CONNECT token to the compiler via the -D switch at compile time. The connection

-			 *        and disconnection events may be manually fired, and the \ref USB_IsConnected global changed manually.

+			 *        and disconnection events may be manually fired, and the \ref USB_DeviceState global changed manually.

 			 *

 			 *  \see USBTask.h for more information on the USB management task and reducing CPU usage.

 			 */

diff --git a/LUFA/Drivers/USB/HighLevel/USBInterrupt.c b/LUFA/Drivers/USB/HighLevel/USBInterrupt.c
index c240bef6e..5edefa996 100644
--- a/LUFA/Drivers/USB/HighLevel/USBInterrupt.c
+++ b/LUFA/Drivers/USB/HighLevel/USBInterrupt.c
@@ -78,19 +78,17 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 		{

 			EVENT_USB_VBUSConnect();

 			

-			if (USB_IsConnected)

+			if (USB_DeviceState != DEVICE_STATE_Unattached)

 			  EVENT_USB_Disconnect();

 				

 			USB_ResetInterface();

-				

-			USB_IsConnected = true;

 

+			USB_DeviceState = DEVICE_STATE_Powered;

 			EVENT_USB_Connect();

 		}

 		else

 		{

-			USB_IsConnected = false;

-

+			USB_DeviceState = DEVICE_STATE_Unattached;

 			EVENT_USB_Disconnect();

 		

 			USB_Detach();

@@ -117,16 +115,12 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 		if (!(USB_Options & USB_OPT_MANUAL_PLL))

 		  USB_PLL_Off();

 

-		USB_IsSuspended = true;

-

-		EVENT_USB_Suspend();

-

 		#if defined(USB_SERIES_2_AVR) && !defined(NO_LIMITED_CONTROLLER_CONNECT)

-		if (USB_IsConnected)

-		{

-			USB_IsConnected = false;

-			EVENT_USB_Disconnect();

-		}

+		USB_DeviceState = DEVICE_STATE_Unattached;

+		EVENT_USB_Disconnect();

+		#else

+		USB_DeviceState = DEVICE_STATE_Suspended;

+		EVENT_USB_Suspend();

 		#endif

 	}

 

@@ -146,22 +140,19 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 		USB_INT_Enable(USB_INT_SUSPEND);

 		

 		#if defined(USB_SERIES_2_AVR) && !defined(NO_LIMITED_CONTROLLER_CONNECT)

-		if (!(USB_IsConnected))

-		{

-			USB_IsConnected = true;

-			EVENT_USB_Connect();

-		}

+		USB_DeviceState = DEVICE_STATE_Powered;

+		EVENT_USB_Connect();

+		#else

+		USB_DeviceState = DEVICE_STATE_Configured;

+		EVENT_USB_WakeUp();		

 		#endif

-

-		USB_IsSuspended = false;

-

-		EVENT_USB_WakeUp();

 	}

    

 	if (USB_INT_HasOccurred(USB_INT_EORSTI) && USB_INT_IsEnabled(USB_INT_EORSTI))

 	{

 		USB_INT_Clear(USB_INT_EORSTI);

 

+		USB_DeviceState         = DEVICE_STATE_Default;

 		USB_ConfigurationNumber = 0;

 

 		USB_INT_Clear(USB_INT_SUSPEND);

@@ -217,7 +208,7 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 

 		USB_INT_Enable(USB_INT_DDISCI);

 		

-		USB_HostState = HOST_STATE_Attached;

+		USB_HostState = HOST_STATE_Powered;

 	}

 

 	if (USB_INT_HasOccurred(USB_INT_BCERRI) && USB_INT_IsEnabled(USB_INT_BCERRI))

@@ -227,7 +218,7 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 		EVENT_USB_DeviceEnumerationFailed(HOST_ENUMERROR_NoDeviceDetected, 0);

 		EVENT_USB_DeviceUnattached();

 		

-		if (USB_IsConnected)

+		if (USB_HostState != HOST_STATE_Unattached)

 		  EVENT_USB_Disconnect();

 

 		USB_ResetInterface();

@@ -239,13 +230,16 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 	{		

 		USB_INT_Clear(USB_INT_IDTI);

 

-		if (USB_IsConnected)

-		{

-			if (USB_CurrentMode == USB_MODE_HOST)

-			  EVENT_USB_DeviceUnattached();

+		if (USB_DeviceState != DEVICE_STATE_Unattached)

+		  EVENT_USB_Disconnect();

 

+		if (USB_HostState != HOST_STATE_Unattached)

+		{

 			EVENT_USB_Disconnect();

+			EVENT_USB_DeviceUnattached();

 		}

+	

+		EVENT_USB_Disconnect();

 

 		EVENT_USB_UIDChange();

 		

diff --git a/LUFA/Drivers/USB/HighLevel/USBTask.c b/LUFA/Drivers/USB/HighLevel/USBTask.c
index 894171f24..500a697bc 100644
--- a/LUFA/Drivers/USB/HighLevel/USBTask.c
+++ b/LUFA/Drivers/USB/HighLevel/USBTask.c
@@ -33,8 +33,6 @@
 #define  INCLUDE_FROM_USBTASK_C

 #include "USBTask.h"

 

-volatile bool        USB_IsSuspended;

-volatile bool        USB_IsConnected;

 volatile bool        USB_IsInitialized;

 USB_Request_Header_t USB_ControlRequest;

 

@@ -42,6 +40,10 @@ USB_Request_Header_t USB_ControlRequest;
 volatile uint8_t     USB_HostState;

 #endif

 

+#if defined(USB_CAN_BE_DEVICE)

+volatile uint8_t     USB_DeviceState;

+#endif

+

 void USB_USBTask(void)

 {

 	#if defined(USB_HOST_ONLY)

@@ -59,7 +61,7 @@ void USB_USBTask(void)
 #if defined(USB_CAN_BE_DEVICE)

 static void USB_DeviceTask(void)

 {

-	if (USB_IsConnected)

+	if (USB_DeviceState != DEVICE_STATE_Unattached)

 	{

 		uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();

 	

diff --git a/LUFA/Drivers/USB/HighLevel/USBTask.h b/LUFA/Drivers/USB/HighLevel/USBTask.h
index 2a9bf1953..12acb1195 100644
--- a/LUFA/Drivers/USB/HighLevel/USBTask.h
+++ b/LUFA/Drivers/USB/HighLevel/USBTask.h
@@ -55,23 +55,6 @@
 

 	/* Public Interface - May be used in end-application: */

 		/* Global Variables: */

-			/** Indicates if the USB interface is currently connected to a host if in device mode, or to a

-			 *  device while running in host mode.

-			 *

-			 *  \note This variable should be treated as read-only in the user application, and never manually

-			 *        changed in value.

-			 *

-			 *  \note For the smaller USB AVRs (AT90USBXX2) with limited USB controllers, VBUS is not available to the USB controller.

-			 *        this means that the current connection state is derived from the bus suspension and wake up events by default,

-			 *        which is not always accurate (host may suspend the bus while still connected). If the actual connection state

-			 *        needs to be determined, VBUS should be routed to an external pin, and the auto-detect behaviour turned off by

-			 *        passing the NO_LIMITED_CONTROLLER_CONNECT token to the compiler via the -D switch at compile time. The connection

-			 *        and disconnection events may be manually fired, and the \ref USB_IsConnected global changed manually.

-			 *

-			 *  \ingroup Group_USBManagement

-			 */

-			extern volatile bool USB_IsConnected;

-

 			/** Indicates if the USB interface is currently initialized but not necessarily connected to a host

 			 *  or device (i.e. if \ref USB_Init() has been run). If this is false, all other library globals are invalid.

 			 *

@@ -90,39 +73,43 @@
 			 */

 			 extern USB_Request_Header_t USB_ControlRequest;

 			

-			#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)

-			/** Indicates if the USB interface is currently suspended by the host when in device mode. When suspended,

-			 *  the device should consume minimal power, and cannot communicate to the host. If Remote Wakeup is

-			 *  supported by the device and \ref USB_RemoteWakeupEnabled is true, suspension can be terminated by the device

-			 *  by issuing a Remote Wakeup request.

-			 *

-			 *  \note This global is only present if the user application can be a USB device.

-			 *

-			 *  \note This variable should be treated as read-only in the user application, and never manually

-			 *        changed in value.

-			 *

-			 *  \ingroup Group_Device

-			 */

-			extern volatile bool USB_IsSuspended;

-			#endif

-

 			#if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)

 			/** Indicates the current host state machine state. When in host mode, this indicates the state

-			 *  via one of the values of the \ref USB_Host_States_t enum values in Host.h.

+			 *  via one of the values of the \ref USB_Host_States_t enum values.

 			 *

 			 *  This value may be altered by the user application to implement the \ref HOST_STATE_Addressed,

-			 *  \ref HOST_STATE_Configured, \ref HOST_STATE_Ready and \ref HOST_STATE_Suspended states which

-			 *  are not implemented by the library.

+			 *  \ref HOST_STATE_Configured and \ref HOST_STATE_Suspended states which are not implemented by

+			 *  the library.

 			 *

 			 *  \note This global is only present if the user application can be a USB host.

 			 *

-			 *  \see \ref USB_Host_States_t for a list of possible host states

+			 *  \see \ref USB_Host_States_t for a list of possible device states

 			 *

 			 *  \ingroup Group_Host

 			 */

 			extern volatile uint8_t USB_HostState;

 			#endif

 

+			#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)

+			/** Indicates the current device state machine state. When in device mode, this indicates the state

+			 *  via one of the values of the \ref USB_Device_States_t enum values.

+			 *

+			 *  This value should not be altered by the user application as it is handled automatically by the

+			 *  library. The only exception to this rule is if the NO_LIMITED_CONTROLLER_CONNECT token is used

+			 *  (see \ref EVENT_USB_Connect() and \ref EVENT_USB_Disconnect() events).

+			 *

+			 *  \note This global is only present if the user application can be a USB device.

+			 *

+			 *  \note This variable should be treated as read-only in the user application, and never manually

+			 *        changed in value except in the circumstances outlined above.

+			 *

+			 *  \see \ref USB_Device_States_t for a list of possible device states

+			 *

+			 *  \ingroup Group_Device

+			 */

+			extern volatile uint8_t USB_DeviceState;

+			#endif

+

 		/* Function Prototypes: */

 			/** This is the main USB management task. The USB driver requires that this task be executed

 			 *  continuously when the USB system is active (device attached in host mode, or attached to a host

diff --git a/LUFA/Drivers/USB/LowLevel/DevChapter9.c b/LUFA/Drivers/USB/LowLevel/DevChapter9.c
index 10dce7298..8de4bd6a8 100644
--- a/LUFA/Drivers/USB/LowLevel/DevChapter9.c
+++ b/LUFA/Drivers/USB/LowLevel/DevChapter9.c
@@ -117,13 +117,22 @@ void USB_Device_ProcessControlPacket(void)
 

 static void USB_Device_SetAddress(void)

 {

+	uint8_t DeviceAddress = (USB_ControlRequest.wValue & 0x7F);

+

 	Endpoint_ClearSETUP();

 	

 	Endpoint_ClearIN();

 	

-	while (!(Endpoint_IsINReady()));

+	while (!(Endpoint_IsINReady()))

+	{

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

+		  return;

+	}

+

+	UDADDR = ((1 << ADDEN) | DeviceAddress);

 

-	UDADDR = ((1 << ADDEN) | ((uint8_t)USB_ControlRequest.wValue & 0x7F));

+	if (DeviceAddress)

+	  USB_DeviceState = DEVICE_STATE_Addressed;

 

 	return;

 }

@@ -185,8 +194,17 @@ static void USB_Device_SetConfiguration(void)
 

 	Endpoint_ClearIN();

 

-	if (!(AlreadyConfigured) && USB_ConfigurationNumber)

-	  EVENT_USB_DeviceEnumerationComplete();

+	if (USB_ConfigurationNumber)

+	{

+		USB_DeviceState = DEVICE_STATE_Configured;

+

+		if (!(AlreadyConfigured))

+		  EVENT_USB_DeviceEnumerationComplete();

+	}

+	else

+	{

+		USB_DeviceState = DEVICE_STATE_Addressed;

+	}

 

 	EVENT_USB_ConfigurationChanged();

 }

@@ -199,7 +217,12 @@ void USB_Device_GetConfiguration(void)
 	

 	Endpoint_ClearIN();

 

-	while (!(Endpoint_IsOUTReceived()));

+	while (!(Endpoint_IsOUTReceived()))

+	{

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

+		  return;	

+	}

+

 	Endpoint_ClearOUT();

 }

 

@@ -332,7 +355,12 @@ static void USB_Device_GetStatus(void)
 

 	Endpoint_ClearIN();

 	

-	while (!(Endpoint_IsOUTReceived()));

+	while (!(Endpoint_IsOUTReceived()))

+	{

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

+		  return;	

+	}

+	

 	Endpoint_ClearOUT();

 }

 

diff --git a/LUFA/Drivers/USB/LowLevel/Device.h b/LUFA/Drivers/USB/LowLevel/Device.h
index 975d09a79..e162a5980 100644
--- a/LUFA/Drivers/USB/LowLevel/Device.h
+++ b/LUFA/Drivers/USB/LowLevel/Device.h
@@ -118,7 +118,36 @@
 

 				#define USB_Device_IsUSBSuspended()           ((UDINT &  (1 << SUSPI)) ? true : false)

 			#endif

-

+			

+		/* Type Defines: */

+			enum USB_Device_States_t

+			{

+				DEVICE_STATE_Unattached                   = 0, /**< Internally implemented by the library. This state indicates

+				                                                *   that the device is not currently connected to a host.

+				                                                */

+				DEVICE_STATE_Powered                      = 1, /**< Internally implemented by the library. This state indicates

+				                                                *   that the device is connected to a host, but enumeration has not

+				                                                *   yet begun.

+				                                                */

+				DEVICE_STATE_Default                      = 2, /**< Internally implemented by the library. This state indicates

+				                                                *   that the device's USB bus has been reset by the host and it is

+				                                                *   now waiting for the host to begin the enumeration process.

+				                                                */

+				DEVICE_STATE_Addressed                    = 3, /**< Internally implemented by the library. This state indicates

+				                                                *   that the device has been addressed by the USB Host, but is not

+				                                                *   yet configured.

+				                                                */

+				DEVICE_STATE_Configured                   = 4, /**< May be implemented by the user project. This state indicates

+				                                                *   that the device has been enumerated by the host and is ready

+				                                                *   for USB communications to begin.

+				                                                */

+				DEVICE_STATE_Suspended                    = 5, /**< May be implemented by the user project. This state indicates

+				                                                *   that the USB bus has been suspended by the host, and the device

+				                                                *   should power down to a minimal power level until the bus is

+				                                                *   resumed.

+				                                                */

+			};

+			

 		/* Function Prototypes: */

 			/** Function to retrieve a given descriptor's size and memory location from the given descriptor type value,

 			 *  index and language ID. This function MUST be overridden in the user application (added with full, identical  

diff --git a/LUFA/Drivers/USB/LowLevel/Endpoint.c b/LUFA/Drivers/USB/LowLevel/Endpoint.c
index f9db9cd22..e4d01404d 100644
--- a/LUFA/Drivers/USB/LowLevel/Endpoint.c
+++ b/LUFA/Drivers/USB/LowLevel/Endpoint.c
@@ -71,6 +71,30 @@ void Endpoint_ClearEndpoints(void)
 	}

 }

 

+void Endpoint_ClearStatusStage(void)

+{

+	if (USB_ControlRequest.bmRequestType & REQDIR_DEVICETOHOST)

+	{

+		while (!(Endpoint_IsOUTReceived()))

+		{				

+			if (USB_DeviceState == DEVICE_STATE_Unattached)

+			  return;

+		}

+

+		Endpoint_ClearOUT();

+	}

+	else

+	{

+		while (!(Endpoint_IsINReady()))

+		{

+			if (USB_DeviceState == DEVICE_STATE_Unattached)

+			  return;

+		}

+		

+		Endpoint_ClearIN();

+	}

+}

+

 #if !defined(CONTROL_ONLY_DEVICE)

 uint8_t Endpoint_WaitUntilReady(void)

 {

@@ -93,7 +117,7 @@ uint8_t Endpoint_WaitUntilReady(void)
 			  return ENDPOINT_READYWAIT_NoError;		

 		}

 		

-		if (!(USB_IsConnected))

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

 		  return ENDPOINT_READYWAIT_DeviceDisconnected;

 		else if (Endpoint_IsStalled())

 		  return ENDPOINT_READYWAIT_EndpointStalled;

diff --git a/LUFA/Drivers/USB/LowLevel/Endpoint.h b/LUFA/Drivers/USB/LowLevel/Endpoint.h
index 2caea8343..a9ec122a2 100644
--- a/LUFA/Drivers/USB/LowLevel/Endpoint.h
+++ b/LUFA/Drivers/USB/LowLevel/Endpoint.h
@@ -431,14 +431,14 @@
 				ENDPOINT_RWSTREAM_EndpointStalled    = 1, /**< The endpoint was stalled during the stream

 				                                           *   transfer by the host or device.

 				                                           */

-				ENDPOINT_RWSTREAM_DeviceDisconnected = 1, /**< Device was disconnected from the host during

+				ENDPOINT_RWSTREAM_DeviceDisconnected = 2, /**< Device was disconnected from the host during

 				                                           *   the transfer.

 				                                           */

-				ENDPOINT_RWSTREAM_Timeout            = 2, /**< The host failed to accept or send the next packet

+				ENDPOINT_RWSTREAM_Timeout            = 3, /**< The host failed to accept or send the next packet

 				                                           *   within the software timeout period set by the

 				                                           *   \ref USB_STREAM_TIMEOUT_MS macro.

 				                                           */

-				ENDPOINT_RWSTREAM_CallbackAborted    = 3, /**< Indicates that the stream's callback function

+				ENDPOINT_RWSTREAM_CallbackAborted    = 4, /**< Indicates that the stream's callback function

 			                                               *   aborted the transfer early.

 				                                           */

 			};

@@ -451,6 +451,9 @@
 			{

 				ENDPOINT_RWCSTREAM_NoError            = 0, /**< Command completed successfully, no error. */

 				ENDPOINT_RWCSTREAM_HostAborted        = 1, /**< The aborted the transfer prematurely. */

+				ENDPOINT_RWCSTREAM_DeviceDisconnected = 2, /**< Device was disconnected from the host during

+				                                            *   the transfer.

+				                                            */

 			};

 

 		/* Inline Functions: */

@@ -726,6 +729,12 @@
 			 *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum.

 			 */

 			uint8_t Endpoint_WaitUntilReady(void);

+			

+			/** Completes the status stage of a control transfer on a CONTROL type endpoint automatically,

+			 *  with respect to the data direction. This is a convenience function which can be used to

+			 *  simplify user control request handling.

+			 */

+			void Endpoint_ClearStatusStage(void);

 

 			/** Reads and discards the given number of bytes from the endpoint from the given buffer,

 			 *  discarding fully read packets from the host as needed. The last packet is not automatically

@@ -922,6 +931,9 @@
 			 *  in both failure and success states; the user is responsible for manually clearing the setup OUT to

 			 *  finalize the transfer via the \ref Endpoint_ClearOUT() macro.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -938,6 +950,9 @@
 

 			/** EEPROM buffer source version of Endpoint_Write_Control_Stream_LE.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -954,6 +969,9 @@
 

 			/** FLASH buffer source version of \ref Endpoint_Write_Control_Stream_LE.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note The FLASH data must be located in the first 64KB of FLASH for this function to work correctly.

 			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

@@ -975,6 +993,9 @@
 			 *  in both failure and success states; the user is responsible for manually clearing the setup OUT to

 			 *  finalize the transfer via the \ref Endpoint_ClearOUT() macro.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -991,6 +1012,9 @@
 

 			/** EEPROM buffer source version of \ref Endpoint_Write_Control_Stream_BE.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -1007,6 +1031,9 @@
 

 			/** FLASH buffer source version of \ref Endpoint_Write_Control_Stream_BE.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note The FLASH data must be located in the first 64KB of FLASH for this function to work correctly.

 			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

@@ -1028,6 +1055,9 @@
 			 *  automatically sent after success or failure states; the user is responsible for manually sending the

 			 *  setup IN to finalize the transfer via the \ref Endpoint_ClearIN() macro.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -1044,6 +1074,9 @@
 

 			/** EEPROM buffer source version of \ref Endpoint_Read_Control_Stream_LE.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -1063,6 +1096,9 @@
 			 *  automatically sent after success or failure states; the user is responsible for manually sending the

 			 *  setup IN to finalize the transfer via the \ref Endpoint_ClearIN() macro.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

@@ -1079,6 +1115,9 @@
 			

 			/** EEPROM buffer source version of \ref Endpoint_Read_Control_Stream_BE.

 			 *

+			 *  \note This function automatically clears the control transfer's status stage. Do not manually attempt

+			 *        to clear the status stage when using this routine in a control transaction.

+			 *

 			 *  \note This routine should only be used on CONTROL type endpoints.

 			 *

 			 *  \warning Unlike the standard stream read/write commands, the control stream commands cannot be chained

diff --git a/LUFA/Drivers/USB/LowLevel/Host.c b/LUFA/Drivers/USB/LowLevel/Host.c
index efe4baeeb..ae7525bee 100644
--- a/LUFA/Drivers/USB/LowLevel/Host.c
+++ b/LUFA/Drivers/USB/LowLevel/Host.c
@@ -60,12 +60,12 @@ void USB_Host_ProcessNextHostState(void)
 			}

 		

 			break;

-		case HOST_STATE_Attached:

+		case HOST_STATE_Powered:

 			WaitMSRemaining = HOST_DEVICE_SETTLE_DELAY_MS;

 		

-			USB_HostState = HOST_STATE_Attached_WaitForDeviceSettle;

+			USB_HostState = HOST_STATE_Powered_WaitForDeviceSettle;

 			break;

-		case HOST_STATE_Attached_WaitForDeviceSettle:

+		case HOST_STATE_Powered_WaitForDeviceSettle:

 			#if HOST_DEVICE_SETTLE_DELAY_MS > 0

 			_delay_ms(1);

 

@@ -77,14 +77,14 @@ void USB_Host_ProcessNextHostState(void)
 				USB_Host_VBUS_Auto_Enable();

 				USB_Host_VBUS_Auto_On();

 				

-				USB_HostState = HOST_STATE_Attached_WaitForConnect;

+				USB_HostState = HOST_STATE_Powered_WaitForConnect;

 			}

 			#else

-			USB_HostState = HOST_STATE_Attached_WaitForConnect;			

+			USB_HostState = HOST_STATE_Powered_WaitForConnect;			

 			#endif

 			

 			break;

-		case HOST_STATE_Attached_WaitForConnect:		

+		case HOST_STATE_Powered_WaitForConnect:		

 			if (USB_INT_HasOccurred(USB_INT_DCONNI))

 			{	

 				USB_INT_Clear(USB_INT_DCONNI);

@@ -93,22 +93,21 @@ void USB_Host_ProcessNextHostState(void)
 				USB_INT_Clear(USB_INT_VBERRI);

 				USB_INT_Enable(USB_INT_VBERRI);

 

-				USB_IsConnected = true;

 				EVENT_USB_Connect();

 					

 				USB_Host_ResumeBus();

 				Pipe_ClearPipes();

 				

-				HOST_TASK_NONBLOCK_WAIT(100, HOST_STATE_Attached_DoReset);

+				HOST_TASK_NONBLOCK_WAIT(100, HOST_STATE_Powered_DoReset);

 			}

 

 			break;

-		case HOST_STATE_Attached_DoReset:

+		case HOST_STATE_Powered_DoReset:

 			USB_Host_ResetDevice();

 

-			HOST_TASK_NONBLOCK_WAIT(200, HOST_STATE_Powered);

+			HOST_TASK_NONBLOCK_WAIT(200, HOST_STATE_Powered_ConfigPipe);

 			break;

-		case HOST_STATE_Powered:

+		case HOST_STATE_Powered_ConfigPipe:

 			Pipe_ConfigurePipe(PIPE_CONTROLPIPE, EP_TYPE_CONTROL,

 							   PIPE_TOKEN_SETUP, ENDPOINT_CONTROLEP,

 							   PIPE_CONTROLPIPE_DEFAULT_SIZE, PIPE_BANK_SINGLE);		

@@ -199,9 +198,7 @@ void USB_Host_ProcessNextHostState(void)
 		USB_Host_VBUS_Auto_Off();

 

 		EVENT_USB_DeviceUnattached();

-		

-		if (USB_IsConnected)

-		  EVENT_USB_Disconnect();

+		EVENT_USB_Disconnect();

 

 		USB_ResetInterface();

 	}

@@ -222,7 +219,7 @@ uint8_t USB_Host_WaitMS(uint8_t MS)
 			MS--;

 		}

 					

-		if ((USB_IsConnected == false) || (USB_CurrentMode == USB_MODE_DEVICE))

+		if ((USB_HostState == HOST_STATE_Unattached) || (USB_CurrentMode == USB_MODE_DEVICE))

 		{

 			ErrorCode = HOST_WAITERROR_DeviceDisconnect;

 			

diff --git a/LUFA/Drivers/USB/LowLevel/Host.h b/LUFA/Drivers/USB/LowLevel/Host.h
index 88634fdae..a602cee77 100644
--- a/LUFA/Drivers/USB/LowLevel/Host.h
+++ b/LUFA/Drivers/USB/LowLevel/Host.h
@@ -241,32 +241,32 @@
 				                                               *   

 				                                               *   \note Do not manually change to this state in the user code.

 				                                               */

-				HOST_STATE_Attached                     = 3,  /**< Internally implemented by the library. This state indicates

+				HOST_STATE_Powered                      = 3,  /**< Internally implemented by the library. This state indicates

 				                                               *   that a device has been attached, and the library's internals

 				                                               *   are being configured to begin the enumeration process.

 				                                               *   

 				                                               *   \note Do not manually change to this state in the user code.

 				                                               */

-				HOST_STATE_Attached_WaitForDeviceSettle = 4,  /**< Internally implemented by the library. This state indicates

+				HOST_STATE_Powered_WaitForDeviceSettle = 4,   /**< Internally implemented by the library. This state indicates

 				                                               *   that the stack is waiting for the initial settling period to

 				                                               *   elapse before beginning the enumeration process.

 				                                               *   

 				                                               *   \note Do not manually change to this state in the user code.

 				                                               */

-				HOST_STATE_Attached_WaitForConnect      = 5,  /**< Internally implemented by the library. This state indicates

+				HOST_STATE_Powered_WaitForConnect      = 5,   /**< Internally implemented by the library. This state indicates

 				                                               *   that the stack is waiting for a connection event from the USB

 				                                               *   controller to indicate a valid USB device has been attached to

 				                                               *   the bus and is ready to be enumerated.

 				                                               *   

 				                                               *   \note Do not manually change to this state in the user code.

 				                                               */

-				HOST_STATE_Attached_DoReset             = 6,  /**< Internally implemented by the library. This state indicates

+				HOST_STATE_Powered_DoReset             = 6,   /**< Internally implemented by the library. This state indicates

 				                                               *   that a valid USB device has been attached, and that it is

 				                                               *   will now be reset to ensure it is ready for enumeration.

 				                                               *   

 				                                               *   \note Do not manually change to this state in the user code.

 				                                               */

-				HOST_STATE_Powered                      = 7,  /**< Internally implemented by the library. This state indicates

+				HOST_STATE_Powered_ConfigPipe           = 7,  /**< Internally implemented by the library. This state indicates

 				                                               *   that the attached device is currently powered and reset, and

 				                                               *   that the control pipe is now being configured by the stack.

 				                                               *   

@@ -301,20 +301,12 @@
 				                                               *   retrieval and processing of the device descriptor) should also

 				                                               *   be placed in this state.

 				                                               */

-				HOST_STATE_Configured                   = 12, /**< May be implemented by the user project. This state should

-				                                               *   implement any extra device configuration (such as the setting of

-				                                               *   class-specific parameters) before normal communication is begun

-				                                               *   in the HOST_STATE_Ready state.

-				                                               */

-				HOST_STATE_Ready                        = 13, /**< May be implemented by the user project. This state should

-				                                               *   contain the main communications with the attached device. From this

-				                                               *   this state the host state machine should be changed to either

-				                                               *   HOST_STATE_Suspended (after the bus is manually suspended using the

-				                                               *   USB_Host_SuspendBus() macro) or HOST_STATE_WaitForDeviceRemoval as

-				                                               *   needed.

+				HOST_STATE_Configured                   = 12, /**< May be implemented by the user project. This state should implement the

+				                                               *   actual work performed on the attached device and changed to the

+				                                               *   HOST_STATE_Suspended or HOST_STATE_WaitForDeviceRemoval states as needed.

 				                                               */

 				HOST_STATE_Suspended                    = 15, /**< May be implemented by the user project. This state should be maintained

-				                                               *   while the bus is suspended, and changed to either the HOST_STATE_Ready

+				                                               *   while the bus is suspended, and changed to either the HOST_STATE_Configured

 				                                               *   (after resuming the bus with the USB_Host_ResumeBus() macro) or the

 				                                               *   HOST_STATE_WaitForDeviceRemoval states as needed.

 				                                               */

diff --git a/LUFA/Drivers/USB/LowLevel/LowLevel.c b/LUFA/Drivers/USB/LowLevel/LowLevel.c
index 4fcf4fcab..cd7fa891d 100644
--- a/LUFA/Drivers/USB/LowLevel/LowLevel.c
+++ b/LUFA/Drivers/USB/LowLevel/LowLevel.c
@@ -110,15 +110,21 @@ void USB_Init(
 

 void USB_ShutDown(void)

 {

-	if (USB_IsConnected)

+	#if defined(USB_CAN_BE_DEVICE)

+	if (USB_DeviceState != DEVICE_STATE_Unattached)

+	  EVENT_USB_Disconnect();

+	#endif

+	

+	#if defined(USB_CAN_BE_HOST)

+	if (USB_HostState != HOST_STATE_Unattached)

 	  EVENT_USB_Disconnect();

+	#endif

 

 	USB_Detach();

 

 	USB_INT_DisableAllInterrupts();

 	USB_INT_ClearAllInterrupts();

 

-	USB_IsConnected   = false;

 	USB_IsInitialized = false;

 

 	#if defined(USB_CAN_BE_HOST)

@@ -126,7 +132,10 @@ void USB_ShutDown(void)
 	#endif

 

 	#if defined(USB_CAN_BE_DEVICE)

-	USB_ConfigurationNumber = 0;

+	USB_DeviceState = DEVICE_STATE_Unattached;

+	USB_ConfigurationNumber  = 0;

+	USB_RemoteWakeupEnabled  = false;

+	USB_CurrentlySelfPowered = false;

 	#endif

 

 	#if defined(CAN_BE_BOTH)

@@ -149,16 +158,14 @@ void USB_ResetInterface(void)
 {

 	USB_INT_DisableAllInterrupts();

 	USB_INT_ClearAllInterrupts();

-

-	USB_IsConnected = false;

-

+	

 	#if defined(USB_CAN_BE_HOST)

-	USB_HostState = HOST_STATE_Unattached;

+	USB_HostState   = HOST_STATE_Unattached;

 	#endif

-

+	

 	#if defined(USB_CAN_BE_DEVICE)

+	USB_DeviceState = DEVICE_STATE_Unattached;

 	USB_ConfigurationNumber  = 0;

-	USB_IsSuspended          = false;

 	USB_RemoteWakeupEnabled  = false;

 	USB_CurrentlySelfPowered = false;

 	#endif

diff --git a/LUFA/Drivers/USB/LowLevel/Pipe.c b/LUFA/Drivers/USB/LowLevel/Pipe.c
index 3fb30a2f7..7d3e87602 100644
--- a/LUFA/Drivers/USB/LowLevel/Pipe.c
+++ b/LUFA/Drivers/USB/LowLevel/Pipe.c
@@ -93,7 +93,7 @@ uint8_t Pipe_WaitUntilReady(void)
 

 		if (Pipe_IsStalled())

 		  return PIPE_READYWAIT_PipeStalled;

-		else if (!(USB_IsConnected))

+		else if (USB_HostState == HOST_STATE_Unattached)

 		  return PIPE_READYWAIT_DeviceDisconnected;

 			  

 		if (USB_INT_HasOccurred(USB_INT_HSOFI))

diff --git a/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_R.c b/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_R.c
index d66edafd6..b85705c22 100644
--- a/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_R.c
+++ b/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_R.c
@@ -14,9 +14,16 @@ uint8_t TEMPLATE_FUNC_NAME (void* Buffer, uint16_t Length)
 			

 			Endpoint_ClearOUT();

 		}

+

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

+		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;

 	}

 	

-	while (!(Endpoint_IsINReady()));

+	while (!(Endpoint_IsINReady()))

+	{

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

+		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;

+	}

 	

 	return ENDPOINT_RWCSTREAM_NoError;

 }

diff --git a/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_W.c b/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_W.c
index 2796c6425..43a9f3d42 100644
--- a/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_W.c
+++ b/LUFA/Drivers/USB/LowLevel/Template/Template_Endpoint_Control_W.c
@@ -8,7 +8,11 @@ uint8_t TEMPLATE_FUNC_NAME (void* Buffer, uint16_t Length)
 	

 	while (Length && !(Endpoint_IsOUTReceived()))

 	{

-		while (!(Endpoint_IsINReady()));

+		while (!(Endpoint_IsINReady()))

+		{

+			if (USB_DeviceState == DEVICE_STATE_Unattached)

+			  return ENDPOINT_RWCSTREAM_DeviceDisconnected;

+		}

 		

 		while (Length && (Endpoint_BytesInEndpoint() < USB_ControlEndpointSize))

 		{

@@ -25,11 +29,20 @@ uint8_t TEMPLATE_FUNC_NAME (void* Buffer, uint16_t Length)
 	

 	if (LastPacketFull)

 	{

-		while (!(Endpoint_IsINReady()));

+		while (!(Endpoint_IsINReady()))

+		{

+			if (USB_DeviceState == DEVICE_STATE_Unattached)

+			  return ENDPOINT_RWCSTREAM_DeviceDisconnected;		

+		}

+		

 		Endpoint_ClearIN();

 	}

 	

-	while (!(Endpoint_IsOUTReceived()));

+	while (!(Endpoint_IsOUTReceived()))

+	{

+		if (USB_DeviceState == DEVICE_STATE_Unattached)

+		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;	

+	}

 

 	return ENDPOINT_RWCSTREAM_NoError;

 }

diff --git a/LUFA/ManPages/ChangeLog.txt b/LUFA/ManPages/ChangeLog.txt
index 0c51940ed..b2500b0c4 100644
--- a/LUFA/ManPages/ChangeLog.txt
+++ b/LUFA/ManPages/ChangeLog.txt
@@ -29,6 +29,8 @@
   *  - Added new USE_FLASH_DESCRIPTORS and TOTAL_NUM_CONFIGURATIONS compile time options

   *  - Added support for the new ATMEGA32U2, ATMEGA16U2 and ATMEGA8U2 AVR models

   *  - Added new PrinterHost demo (thanks to John Andrews)

+  *  - Added new USB_DeviceState variable to keep track of the current Device mode USB state

+  *  - Added new Endpoint_ClearStatusStage() convenience function to assist with the status stages of control transfers

   *  

   *  <b>Changed:</b>

   *  - Deprecated psuedo-scheduler and removed dynamic memory allocator from the library (first no longer needed and second unused)

@@ -47,6 +49,8 @@
   *    descriptor is located can be specified. This means that descriptors can now be located in multiple memory spaces within a device.

   *  - Host mode demos now use sane terminal escape codes, so that text is always readable and events/program output is visually distinguished

   *    from oneanother using foreground colours

+  *  - Removed vague USB_IsConnected global - test USB_DeviceState or USB_HostState explicitly to gain previous functionality

+  *  - Removed USB_IsSuspended global - test USB_DeviceState against DEVICE_STATE_Suspended instead

   *

   *  <b>Fixed:</b>

   *  - Changed bootloaders to use FLASHEND rather than the existence of RAMPZ to determine if far FLASH pointers are needed to fix

@@ -91,6 +95,8 @@
   *    LUFA/Drivers/USB/Class/ directory to LUFA/Drivers/USB/HighLevel/ in preperation for the new USB class APIs

   *  - Moved out each demos' functionality library files (e.g. Ring Buffer library) to /Lib directories for a better directory structure

   *  - Removed Tx interrupt from the USBtoSerial demo; now sends characters via polling to ensure more time for the Rx interrupt

+  *  - Fixed possible enumeration errors from spinloops which may fail to exit if the USB connection is severed before the exit condition

+  *    becomes true

   *

   *

   *  \section Sec_ChangeLog090510 Version 090510

diff --git a/LUFA/ManPages/CompileTimeTokens.txt b/LUFA/ManPages/CompileTimeTokens.txt
index 2d9ec7a95..f11dff2e1 100644
--- a/LUFA/ManPages/CompileTimeTokens.txt
+++ b/LUFA/ManPages/CompileTimeTokens.txt
@@ -157,7 +157,7 @@
  *  On the smaller USB AVRs, the USB controller lacks VBUS events to determine the physical connection state of the USB bus to a host. In lieu of

  *  VBUS events, the library attempts to determine the connection state via the bus suspension and wake up events instead. This however may be

  *  slightly inaccurate due to the possibility of the host suspending the bus while the device is still connected. If accurate connection status is

- *  required, the VBUS line of the USB connector should be routed to an AVR pin to detect its level, so that the USB_IsConnected global

+ *  required, the VBUS line of the USB connector should be routed to an AVR pin to detect its level, so that the USB_DeviceState global

  *  can be accurately set and the USB_Connect and USB_Disconnect events manually raised by the RAISE_EVENT macro. When defined, this token disables

  *  the library's auto-detection of the connection state by the aforementioned suspension and wake up events.

  *

diff --git a/LUFA/ManPages/MigrationInformation.txt b/LUFA/ManPages/MigrationInformation.txt
index 945406d61..5ea8d9c16 100644
--- a/LUFA/ManPages/MigrationInformation.txt
+++ b/LUFA/ManPages/MigrationInformation.txt
@@ -19,17 +19,23 @@
  *    - The "Dynamic Memory Block Allocator" has been removed, as it was unused in (and unrelated to) the LUFA library and never

  *      used in user applications. The library is available from the author's website for those wishing to still use it in their

  *      applications.

+ *    - The USB_IsConnected global has been removed, as it is too vague for general use. Test \ref USB_DeviceState or \ref USB_HostState

+ *      explicitly to ensure the device is in the desired state instead.

  *

  *  <b>Host Mode</b>

  *    - The HIDParser.c module has moved from LUFA/Drivers/USB/Class/ to LUFA/Drivers/USB/Class/Host/.

- *    - The USB_GetDeviceConfigDescriptor() function now requires the desired configuration index within the device as its first

+ *    - The \ref USB_GetDeviceConfigDescriptor() function now requires the desired configuration index within the device as its first

  *      parameter, to add support for multi-configuration devices. Existing code should use a configuration index of 1 to indicate the

  *      first configuration descriptor within the device.

+ *    - The non-standard "Ready" host state has been removed. Existing \ref HOST_STATE_Configured code should be moved to the end of

+ *      the existing \ref HOST_STATE_Addressed state, and the existing HOST_STATE_Ready state code should be moved to the \ref HOST_STATE_Configured

+ *      state.

  *

  *  <b>Device Mode</b>

  *    - The \ref CALLBACK_USB_GetDescriptor() function now takes an extra parameter to specify the descriptor's memory space so that

  *      descriptors in mixed memory spaces can be used. The previous functionality can be returned by defining the USE_FLASH_DESCRIPTORS

  *      token in the project makefile to fix all descriptors into FLASH space and remove the extra function parameter.

+ *    - Removed USB_IsSuspended - test \ref USB_DeviceState against \ref DEVICE_STATE_Suspended instead.

  *

  *

  * \section Sec_Migration090605 Migrating from 090510 to 090605