Added support to the MIDI Class drivers for packed data, where multiple MIDI events are packed into a single USB packet. Added new MIDI Class driver flush routines to override packing behaviour.

Demos/Device/ClassDriver/MIDI/MIDI.c

@@ -158,6 +158,7 @@ void CheckJoystickMovement(void)
 			};
 			
 		MIDI_Device_SendEventPacket(&Keyboard_MIDI_Interface, &MIDIEvent);
+		MIDI_Device_Flush(&Keyboard_MIDI_Interface);
 	}
 
 	PrevJoystickStatus = JoystickStatus;

Demos/Host/ClassDriver/MIDIHost/MIDIHost.c

@@ -203,6 +203,7 @@ void CheckJoystickMovement(void)
 			};
 			
 		MIDI_Host_SendEventPacket(&Keyboard_MIDI_Interface, &MIDIEvent);
+		MIDI_Host_Flush(&Keyboard_MIDI_Interface);
 	}
 
 	PrevJoystickStatus = JoystickStatus;

Demos/Host/LowLevel/RNDISEthernetHost/ConfigDescriptor.c

@@ -158,7 +158,7 @@ uint8_t ProcessConfigurationDescriptor(void)
 			}
 			else
 			{
-				/* Only configure the OUT data pipe if the data endpoints haev not shown to be bidirectional */
+				/* Only configure the OUT data pipe if the data endpoints have not shown to be bidirectional */
 				if (!(Pipe_IsEndpointBound(EndpointData->EndpointAddress)))
 				{
 					/* Configure the data OUT pipe */

Demos/Host/LowLevel/VirtualSerialHost/ConfigDescriptor.c

@@ -158,7 +158,7 @@ uint8_t ProcessConfigurationDescriptor(void)
 			}
 			else
 			{
-				/* Only configure the OUT data pipe if the data endpoints haev not shown to be bidirectional */
+				/* Only configure the OUT data pipe if the data endpoints have not shown to be bidirectional */
 				if (!(Pipe_IsEndpointBound(EndpointData->EndpointAddress)))
 				{
 					/* Configure the data OUT pipe */

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

@@ -155,7 +155,9 @@
 			void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 
 			/** Sends a given string to the attached USB host, if connected. If a host is not connected when the function is called, the
-			 *  string is discarded.
+			 *  string is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the
+			 *  \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be 
+			 *  packed into a single endpoint packet, increasing data throughput.
 			 *
 			 *  \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
 			 *        the call will fail.
@@ -170,7 +172,9 @@
 			                              ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 			
 			/** 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.
+			 *  byte is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the
+			 *  \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be 
+			 *  packed into a single endpoint packet, increasing data throughput.
 			 *
 			 *  \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
 			 *        the call will fail.

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

@@ -79,12 +79,33 @@ uint8_t MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInter
 		if ((ErrorCode = Endpoint_Write_Stream_LE(Event, sizeof(MIDI_EventPacket_t), NO_STREAM_CALLBACK)) != ENDPOINT_RWSTREAM_NoError)
 		  return ErrorCode;
 
-		Endpoint_ClearIN();
+		if (!(Endpoint_IsReadWriteAllowed()))
+		  Endpoint_ClearIN();
 	}
 	
 	return ENDPOINT_RWSTREAM_NoError;
 }
 
+uint8_t MIDI_Device_Flush(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
+{
+	if (USB_DeviceState != DEVICE_STATE_Configured)
+	  return ENDPOINT_RWSTREAM_DeviceDisconnected;
+	
+	uint8_t ErrorCode;
+
+	Endpoint_SelectEndpoint(MIDIInterfaceInfo->Config.DataINEndpointNumber);
+
+	if (Endpoint_BytesInEndpoint())
+	{
+		Endpoint_ClearIN();
+
+		if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
+		  return ErrorCode;
+	}
+
+	return ENDPOINT_READYWAIT_NoError;
+}
+
 bool MIDI_Device_ReceiveEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)
 {
 	if (USB_DeviceState != DEVICE_STATE_Configured)
@@ -96,7 +117,9 @@ bool MIDI_Device_ReceiveEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInter
 	  return false;
 
 	Endpoint_Read_Stream_LE(Event, sizeof(MIDI_EventPacket_t), NO_STREAM_CALLBACK);
-	Endpoint_ClearOUT();
+	
+	if (!(Endpoint_IsReadWriteAllowed()))
+	  Endpoint_ClearOUT();
 	
 	return true;
 }

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

@@ -104,7 +104,9 @@
 			 */		
 			void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 
-			/** Sends a MIDI event packet to the host. If no host is connected, the event packet is discarded.
+			/** Sends a MIDI event packet to the host. If no host is connected, the event packet is discarded. Events are queued into the
+			 *  endpoint bank until either the endpoint bank is full, or \ref MIDI_Device_Flush() is called. This allows for multiple
+			 *  MIDI events to be packed into a single endpoint packet, increasing data throughput.
 			 *
 			 *  \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
 			 *        the call will fail.
@@ -117,7 +119,18 @@
 			uint8_t MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo,
 			                                    MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 
-			/** Receives a MIDI event packet from the host.
+
+			/** Flushes the MIDI send buffer, sending any queued MIDI events to the host. This should be called to override the
+			 *  \ref MIDI_Device_SendEventPacket() function's packing behaviour, to flush queued events.
+			 *
+			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state
+			 *
+			 *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
+			 */
+			uint8_t MIDI_Device_Flush(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo);
+
+			/** Receives a MIDI event packet from the host. Events are unpacked from the endpoint, thus if the endpoint bank contains
+			 *  multiple MIDI events from the host in the one packet, multiple calls to this function will return each individual event.
 			 *
 			 *  \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
 			 *        the call will fail.

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

@@ -175,7 +175,9 @@
 			uint8_t CDC_Host_SendControlLineStateChange(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 			
 			/** Sends a given string to the attached USB device, if connected. If a device is not connected when the function is called, the
-			 *  string is discarded.
+			 *  string is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
+			 *  \ref CDC_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be 
+			 *  packed into a single pipe packet, increasing data throughput.
 			 *
 			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
 			 *        call will fail.
@@ -189,8 +191,10 @@
 			uint8_t CDC_Host_SendString(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, char* Data, const uint16_t Length)
 			                            ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 			
-			/** Sends a given byte to the attached USB device, if connected. If a host is not connected when the function is called, the
+			/** Sends a given byte to the attached USB device, if connected. If a device is not connected when the function is called, the
-			 *  byte is discarded.
+			 *  byte is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
+			 *  \ref CDC_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be 
+			 *  packed into a single pipe packet, increasing data throughput.
 			 *
 			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
 			 *        call will fail.

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

@@ -122,6 +122,26 @@ static uint8_t DComp_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const Current
 	return DESCRIPTOR_SEARCH_NotFound;
 }
 
+uint8_t MIDI_Host_Flush(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo)
+{
+	if (USB_HostState != HOST_STATE_Configured)
+	  return PIPE_RWSTREAM_DeviceDisconnected;
+	
+	uint8_t ErrorCode;
+
+	Pipe_SelectPipe(MIDIInterfaceInfo->Config.DataOUTPipeNumber);
+
+	if (Pipe_BytesInPipe())
+	{
+		Pipe_ClearOUT();
+
+		if ((ErrorCode = Pipe_WaitUntilReady()) != PIPE_READYWAIT_NoError)
+		  return ErrorCode;
+	}
+
+	return PIPE_READYWAIT_NoError;
+}
+
 uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)
 {
 	if ((USB_HostState != HOST_STATE_Configured) || !(MIDIInterfaceInfo->State.IsActive))
@@ -136,7 +156,8 @@ uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterface
 		if ((ErrorCode = Pipe_Write_Stream_LE(Event, sizeof(MIDI_EventPacket_t), NO_STREAM_CALLBACK)) != PIPE_RWSTREAM_NoError)
 		  return ErrorCode;
 
-		Pipe_ClearOUT();
+		if (!(Pipe_IsReadWriteAllowed()))
+		  Pipe_ClearOUT();
 	}
 	
 	return PIPE_RWSTREAM_NoError;
@@ -153,7 +174,9 @@ bool MIDI_Host_ReceiveEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterface
 	  return false;
 
 	Pipe_Read_Stream_LE(Event, sizeof(MIDI_EventPacket_t), NO_STREAM_CALLBACK);
-	Pipe_ClearIN();
+
+	if (!(Pipe_IsReadWriteAllowed()))
+	  Pipe_ClearIN();
 	
 	return true;
 }

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

@@ -125,6 +125,17 @@
 			uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
 			                                  MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 
+			/** Flushes the MIDI send buffer, sending any queued MIDI events to the device. This should be called to override the
+			 *  \ref MIDI_Host_SendEventPacket() function's packing behaviour, to flush queued events. Events are queued into the
+			 *  pipe bank until either the pipe bank is full, or \ref MIDI_Host_Flush() is called. This allows for multiple MIDI
+			 *  events to be packed into a single pipe packet, increasing data throughput.
+			 *
+			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state
+			 *
+			 *  \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum
+			 */
+			 uint8_t MIDI_Host_Flush(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo);
+			 
 			/** Receives a MIDI event packet from the device.
 			 *
 			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the

LUFA/ManPages/ChangeLog.txt

@@ -14,6 +14,9 @@
   *    to a target
   *  - Added new TemperatureDataLogger application, a USB data logger which writes to the device's dataflash and appears to
   *    the host as a standard Mass Storage device when inserted
+  *  - Added MIDI event packing support to the MIDI Device and Host mode Class drivers, allowing for multiple MIDI events to
+  *    sent or received in packed form in a single USB packet
+  *  - Added new MIDI send buffer flush routines to the MIDI Device and Host mode Class drivers, to flush packed events
   *
   *  <b>Changed:</b>
   *  - Slowed down bit-banged PDI programming in the AVRISP project slightly to prevent transmission errors

LUFA/ManPages/MigrationInformation.txt

@@ -12,7 +12,17 @@
  *
  * \section Sec_MigrationXXXXXX Migrating from 091223 to XXXXXX
  *
- *  <i>There is no migration information for this release.</i>
+ *  <b>Host Mode</b>
+ *    - The MIDI Host Class driver send and receive routines now operate on packed events, where multiple MIDI events may be
+ *      packed into a single USB packet. This means that the sending of MIDI events will now be delayed until the MIDI send
+ *      pipe bank is full. To override this new behaviour and revert to the previous behaviour, the user application may manually
+ *      flush the queued event(s) to the device by calling \ref MIDI_Host_Flush().
+ *
+ *  <b>Device Mode</b>
+ *    - The MIDI Device Class driver send and receive routines now operate on packed events, where multiple MIDI events may be
+ *      packed into a single USB packet. This means that the sending of MIDI events will now be delayed until the MIDI send
+ *      endpoint bank is full. To override this new behaviour and revert to the previous behaviour, the user application may manually
+ *      flush the queued event(s) to the host by calling \ref MIDI_Device_Flush().
  *
  * \section Sec_Migration091223 Migrating from 091122 to 091223
  *

Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c

@@ -226,6 +226,9 @@ void XPROGTarget_EnableTargetTPI(void)
 /** Disables the target's PDI interface, exits programming mode and starts the target's application. */
 void XPROGTarget_DisableTargetPDI(void)
 {
+	/* Switch to Rx mode to ensure that all pending transmissions are complete */
+	XPROGTarget_SetRxMode();
+
 #if defined(XPROG_VIA_HARDWARE_USART)
 	/* Turn off receiver and transmitter of the USART, clear settings */
 	UCSR1A |= (1 << TXC1) | (1 << RXC1);
@@ -249,6 +252,9 @@ void XPROGTarget_DisableTargetPDI(void)
 /** Disables the target's TPI interface, exits programming mode and starts the target's application. */
 void XPROGTarget_DisableTargetTPI(void)
 {
+	/* Switch to Rx mode to ensure that all pending transmissions are complete */
+	XPROGTarget_SetRxMode();
+
 #if defined(XPROG_VIA_HARDWARE_USART)
 	/* Turn off receiver and transmitter of the USART, clear settings */
 	UCSR1A |= (1 << TXC1) | (1 << RXC1);