Cache the USB_DeviceState variable internally in the library core when multiple checks are required in a single loop iteration, to reduce compiled code size.

LUFA/Drivers/USB/HighLevel/Template/Template_Endpoint_Control_R.c

@@ -8,13 +8,14 @@ uint8_t TEMPLATE_FUNC_NAME (void* Buffer,
 	
 	while (Length)
 	{
-		if (Endpoint_IsSETUPReceived())
-		  return ENDPOINT_RWCSTREAM_HostAborted;
+		uint8_t USB_DeviceState_LCL = USB_DeviceState;
 
-		if (USB_DeviceState == DEVICE_STATE_Unattached)
+		if (USB_DeviceState_LCL == DEVICE_STATE_Unattached)
 		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;
-		else if (USB_DeviceState == DEVICE_STATE_Suspended)
+		else if (USB_DeviceState_LCL == DEVICE_STATE_Suspended)
 		  return ENDPOINT_RWCSTREAM_BusSuspended;
+		else if (Endpoint_IsSETUPReceived())
+		  return ENDPOINT_RWCSTREAM_HostAborted;
 		  
 		if (Endpoint_IsOUTReceived())
 		{
@@ -30,9 +31,11 @@ uint8_t TEMPLATE_FUNC_NAME (void* Buffer,
 	
 	while (!(Endpoint_IsINReady()))
 	{
-		if (USB_DeviceState == DEVICE_STATE_Unattached)
+		uint8_t USB_DeviceState_LCL = USB_DeviceState;
+
+		if (USB_DeviceState_LCL == DEVICE_STATE_Unattached)
 		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;
-		else if (USB_DeviceState == DEVICE_STATE_Suspended)
+		else if (USB_DeviceState_LCL == DEVICE_STATE_Suspended)
 		  return ENDPOINT_RWCSTREAM_BusSuspended;
 	}
 	

LUFA/Drivers/USB/HighLevel/Template/Template_Endpoint_Control_W.c

@@ -11,16 +11,16 @@ uint8_t TEMPLATE_FUNC_NAME (const void* Buffer,
 
 	while (Length || LastPacketFull)
 	{
-		if (Endpoint_IsSETUPReceived())
-		  return ENDPOINT_RWCSTREAM_HostAborted;
-
-		if (Endpoint_IsOUTReceived())
-		  break;
+		uint8_t USB_DeviceState_LCL = USB_DeviceState;
 		
-		if (USB_DeviceState == DEVICE_STATE_Unattached)
+		if (USB_DeviceState_LCL == DEVICE_STATE_Unattached)
 		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;
-		else if (USB_DeviceState == DEVICE_STATE_Suspended)
+		else if (USB_DeviceState_LCL == DEVICE_STATE_Suspended)
 		  return ENDPOINT_RWCSTREAM_BusSuspended;
+		else if (Endpoint_IsSETUPReceived())
+		  return ENDPOINT_RWCSTREAM_HostAborted;
+		else if (Endpoint_IsOUTReceived())
+		  break;
 
 		if (Endpoint_IsINReady())
 		{
@@ -40,9 +40,11 @@ uint8_t TEMPLATE_FUNC_NAME (const void* Buffer,
 	
 	while (!(Endpoint_IsOUTReceived()))
 	{
-		if (USB_DeviceState == DEVICE_STATE_Unattached)
+		uint8_t USB_DeviceState_LCL = USB_DeviceState;
+
+		if (USB_DeviceState_LCL == DEVICE_STATE_Unattached)
 		  return ENDPOINT_RWCSTREAM_DeviceDisconnected;
-		else if (USB_DeviceState == DEVICE_STATE_Suspended)
+		else if (USB_DeviceState_LCL == DEVICE_STATE_Suspended)
 		  return ENDPOINT_RWCSTREAM_BusSuspended;
 	}
 

LUFA/Drivers/USB/LowLevel/Endpoint.c

@@ -115,9 +115,11 @@ uint8_t Endpoint_WaitUntilReady(void)
 			  return ENDPOINT_READYWAIT_NoError;
 		}
 		
-		if (USB_DeviceState == DEVICE_STATE_Unattached)
+		uint8_t USB_DeviceState_LCL = USB_DeviceState;
+
+		if (USB_DeviceState_LCL == DEVICE_STATE_Unattached)
 		  return ENDPOINT_READYWAIT_DeviceDisconnected;
-		else if (USB_DeviceState == DEVICE_STATE_Suspended)
+		else if (USB_DeviceState_LCL == DEVICE_STATE_Suspended)
 		  return ENDPOINT_READYWAIT_BusSuspended;		
 		else if (Endpoint_IsStalled())
 		  return ENDPOINT_READYWAIT_EndpointStalled;

LUFA/ManPages/ChangeLog.txt

@@ -18,7 +18,7 @@
   *    handling of USB Start of Frame events while in USB Host mode
   *  - Added new PRNT_Host_BytesReceived(), PRNT_Host_ReceiveByte(), PRNT_Host_SendByte() and PRNT_Host_Flush() functions to the
   *    Print Host Class driver
-  *  - Added class specific descriptor type defines with standard USB-IF element naming
+  *  - Added class specific descriptor alternative struct type defines with standard USB-IF element naming
   *  - Added new project makefile template to the library and moved board driver stub files into in a new "CodeTemplates" directory
   *  - Added board hardware driver support for the Linnix UDIP development board
   *  - Added board hardware driver support for the Busware BUI development board
@@ -42,7 +42,7 @@
   *  - Changed over all demos, drivers and internal functions to use the current frame number over the Start of Frame flag where possible
   *    to free up the Start of Frame flag for interrupt use in the user application
   *  - All project makefiles now correctly clean intermediate build files from assembly and C++ sources (thanks to Daniel Czigany)
-  *  - Removed the EVENT_USB_InitFailure() event, not specifying a USB mode now defaults to UID selection mode
+  *  - Removed the EVENT_USB_InitFailure() event, not specifying a USB mode correctly now defaults to UID selection mode
   *  - Renamed and moved class driver common constant definitions to make the naming scheme more uniform
   *  - Changed default value for the reset polarity parameter in the AVRISP-MKII project so that it defaults to active low drive
   *  - Changed configuration descriptor parser for all host mode projects and class drivers to ensure better compatibility with devices

LUFA/ManPages/WhyUseLUFA.txt

@@ -40,7 +40,7 @@
  *    into difficulties or need some advice. In addition, you can also email the library author to receive personalized
  *    support when you need it (subject to author's schedule).
  *
- *   <small>* Atmel Stack Mouse Device Demo 4292 bytes, LUFA Mouse Low Level Device Demo 3372 bytes, under identical build
+ *   <small>* Atmel Stack Mouse Device Demo 4292 bytes, LUFA Mouse Low Level Device Demo 3332 bytes, under identical build
  *   environments</small>
  */