Moved calls to Device mode Class Driver events to after the request has been acknowledged, so that long event handlers do do skew the timing of the control requests.

Fixed USBtoSerial and Benito project SetLineEncoding calls failing if the USART is busy, due to the RX ISR delaying the control request handler.

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

@@ -64,21 +64,24 @@ 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));
-				EVENT_CDC_Device_LineEncodingChanged(CDCInterfaceInfo);
 				Endpoint_ClearIN();
+
+				EVENT_CDC_Device_LineEncodingChanged(CDCInterfaceInfo);
 			}
 	
 			break;
 		case REQ_SetControlLineState:
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{				
-				Endpoint_ClearSETUP();
-				
+				Endpoint_ClearSETUP();				
+
 				CDCInterfaceInfo->State.ControlLineStates.HostToDevice = USB_ControlRequest.wValue;
-				EVENT_CDC_Device_ControLineStateChanged(CDCInterfaceInfo);
 
 				Endpoint_ClearStatusStage();
+
+				EVENT_CDC_Device_ControLineStateChanged(CDCInterfaceInfo);
 			}
 	
 			break;
@@ -86,10 +89,9 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{				
 				Endpoint_ClearSETUP();
-				
-				EVENT_CDC_Device_BreakSent(CDCInterfaceInfo, (uint8_t)USB_ControlRequest.wValue);
-
 				Endpoint_ClearStatusStage();
+
+				EVENT_CDC_Device_BreakSent(CDCInterfaceInfo, (uint8_t)USB_ControlRequest.wValue);
 			}
 
 			break;

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

@@ -83,8 +83,9 @@ void RNDIS_Device_ProcessControlRequest(USB_ClassInfo_RNDIS_Device_t* const RNDI
 				Endpoint_ClearSETUP();
 
 				Endpoint_Read_Control_Stream_LE(RNDISInterfaceInfo->State.RNDISMessageBuffer, USB_ControlRequest.wLength);
-				RNDIS_Device_ProcessRNDISControlMessage(RNDISInterfaceInfo);
 				Endpoint_ClearIN();
+
+				RNDIS_Device_ProcessRNDISControlMessage(RNDISInterfaceInfo);
 			}
 			
 			break;

LUFA/ManPages/ChangeLog.txt

@@ -20,6 +20,8 @@
   *    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
+  *    do skew the timing of the control requests
   *
   *  <b>Fixed:</b>
   *  - Fixed USB_GetHIDReportItemInfo() function modifying the given report item's data when the report item does not exist
@@ -28,6 +30,8 @@
   *    missed SCSI sense values when the host retrieves the sense key (thanks to Martin Degelsegger)
   *  - Fixed critical pipe/endpoint memory allocation issue where the bank memory address space could be silently overlapped
   *    in the USB controller if the endpoints or pipes were allocated in anything other than ascending order (thanks to Martin Degelsegger)
+  *  - Fixed USBtoSerial and Benito project SetLineEncoding calls failing if the USART is busy, due to the RX ISR delaying the control
+  *    request handler
   *
   *  \section Sec_ChangeLog100807 Version 100807
   *  <b>New:</b>

Projects/Benito/makefile

@@ -121,6 +121,7 @@ LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8
 LUFA_OPTS += -D FIXED_NUM_CONFIGURATIONS=1
 LUFA_OPTS += -D USE_FLASH_DESCRIPTORS
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
+LUFA_OPTS += -D INTERRUPT_CONTROL_ENDPOINT
 
 LUFA_OPTS += -D AVR_RESET_LINE_PORT="PORTD"
 LUFA_OPTS += -D AVR_RESET_LINE_DDR="DDRD"

Projects/USBtoSerial/USBtoSerial.c

@@ -207,6 +207,6 @@ void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCI
 	
 	/* Reconfigure the USART in double speed mode for a wider baud rate range at the expense of accuracy */
 	UCSR1C = ConfigMask;
-	UCSR1A = (1 << U2X1);	
+	UCSR1A = (1 << U2X1);
 	UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
 }

Projects/USBtoSerial/makefile

@@ -121,6 +121,7 @@ LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8
 LUFA_OPTS += -D FIXED_NUM_CONFIGURATIONS=1
 LUFA_OPTS += -D USE_FLASH_DESCRIPTORS
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
+LUFA_OPTS += -D INTERRUPT_CONTROL_ENDPOINT
 
 
 # Create the LUFA source path variables by including the LUFA root makefile