Added return values to the CDC and MIDI class driver transmit functions.

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

@@ -121,46 +121,55 @@ void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
 	CDC_Device_Flush(CDCInterfaceInfo);
 }
 
-void CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length)
+uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length)
 {
 	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
-	  return;
+	  return ENDPOINT_READYWAIT_NoError;
 	
 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
-	Endpoint_Write_Stream_LE(Data, Length, NO_STREAM_CALLBACK);
+	return Endpoint_Write_Stream_LE(Data, Length, NO_STREAM_CALLBACK);
 }
 
-void CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data)
+uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data)
 {
 	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
-	  return;
+	  return ENDPOINT_READYWAIT_NoError;
 
 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
 
 	if (!(Endpoint_IsReadWriteAllowed()))
 	{
+		uint8_t ErrorCode;
+	
 		Endpoint_ClearIN();
-		Endpoint_WaitUntilReady();
+
+		if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
+		  return ErrorCode;
 	}
 
 	Endpoint_Write_Byte(Data);
+	return ENDPOINT_READYWAIT_NoError;
 }
 
-void CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
+uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 {
 	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
-	  return;
+	  return ENDPOINT_READYWAIT_NoError;
 
 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
 	
 	if (Endpoint_BytesInEndpoint())
 	{
+		uint8_t ErrorCode;
+
 		Endpoint_ClearIN();
-		Endpoint_WaitUntilReady();
+		
+		if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
+		  return ErrorCode;
 	}
 	
 	Endpoint_ClearIN();
-	Endpoint_WaitUntilReady();	
+	return Endpoint_WaitUntilReady();
 }
 
 uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
@@ -175,7 +184,7 @@ 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_DeviceState != DEVICE_STATE_Configured)
+	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
 	  return 0;
 
 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);
@@ -190,7 +199,7 @@ uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
 
 void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 {
-	if (USB_DeviceState != DEVICE_STATE_Configured)
+	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
 	  return;
 
 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.NotificationEndpointNumber);

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

@@ -156,16 +156,20 @@
 			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state.
 			 *  \param[in] Data  Pointer to the string to send to the host
 			 *  \param[in] Length  Size in bytes of the string to send to the host
+			 *
+			 *  \return A value from the \ref Endpoint_Stream_RW_ErrorCodes_t enum
 			 */
-			void CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length);
+			uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length);
 			
 			/** Sends a given byte to the attached USB host, if connected. If a host is not connected when the function is called, the
 			 *  byte is discarded.
 			 *
 			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state.
 			 *  \param[in] Data  Byte of data to send to the host
+			 *
+			 *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
 			 */
-			void CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data);
+			uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data);
 			
 			/** Determines the number of bytes received by the CDC interface from the host, waiting to be read.
 			 *
@@ -188,8 +192,10 @@
 			/** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
 			 *
 			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state.
+			 *
+			 *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
 			 */
-			void CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo);
+			uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo);
 			
 			/** Sends a Serial Control Line State Change notification to the host. This should be called when the virtual serial
 			 *  control lines (DCD, DSR, etc.) have changed states, or to give BREAK notfications to the host. Line states persist

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

@@ -70,18 +70,24 @@ 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)
+uint8_t MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)
 {
 	if (USB_DeviceState != DEVICE_STATE_Configured)
-	  return;
+	  return ENDPOINT_RWSTREAM_NoError;
 	
 	Endpoint_SelectEndpoint(MIDIInterfaceInfo->Config.DataINEndpointNumber);
 
 	if (Endpoint_IsReadWriteAllowed());
 	{
-		Endpoint_Write_Stream_LE(Event, sizeof(Event), NO_STREAM_CALLBACK);
+		uint8_t ErrorCode;
+
+		if ((ErrorCode = Endpoint_Write_Stream_LE(Event, sizeof(Event), NO_STREAM_CALLBACK)) != ENDPOINT_RWSTREAM_NoError)
+		  return ErrorCode;
+
 		Endpoint_ClearIN();
 	}
+	
+	return ENDPOINT_RWSTREAM_NoError;
 }
 
 bool MIDI_Device_ReceiveEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)

LUFA/Drivers/USB/Class/Device/MIDI.h

@@ -113,8 +113,10 @@
 			 *
 			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state.
 			 *  \param[in] Event  Pointer to a populated USB_MIDI_EventPacket_t structure containing the MIDI event to send
+			 *
+			 *  \return A value from the \ref Endpoint_Stream_RW_ErrorCodes_t enum			 
 			 */
-			void MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event);
+			uint8_t MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event);
 
 			/** Receives a MIDI event packet from the host.
 			 *

LUFA/ManPages/ChangeLog.txt

@@ -19,6 +19,7 @@
   *    HID interface within the device, not all HID interfaces
   *  - Added new CDC_Device_Flush() command to the device mode CDC Class driver
   *  - Added explicit attribute masks to the device mode demos' descriptors
+  *  - Added return values to the CDC and MIDI class driver transmit functions
   *
   *  <b>Fixed:</b>
   *  - Fixed possible lockup in the CDC device class driver, when the host sends data that is a multiple of the

LUFA/ManPages/FutureChanges.txt

@@ -13,11 +13,6 @@
   *
   *  <b>Targeted for This Release:</b>
   *  - Host Mode Class Drivers
-  *     -# Make new host class drivers
-  *     -# Document new host class drivers
-  *     -# Convert Host mode demos to class drivers
-  *     -# Re-enable Host mode Class driver builds after completion
-  *     -# Update Host mode Class Driver demo .txt files
   *  - Add overviews of each of the officially supported boards to the manual
   *  - Add hub support to match Atmel's stack
   *