Reverted Endpoint/Pipe non-sequential configuration hack, placed restriction on the configuration order instead to ensure maximum reliability.

Altered all low level device and host mode demos to ensure that endpoints and pipes are configured in ascending order properly.

Rewrote all low level host mode demos' configuration descriptor parser code to ensure that pipes are enumerated in ascending order, and to ensure maximum compatibility with devices.

Incremented all device mode demo's device descriptor revision numbers to ensure that any descriptor changes are re-fetched on machines which have enumerated previous versions.

1 files changed, 31 insertions, 26 deletions

diff --git a/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c b/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c
index 0c2ddfa92..3ede45778 100644
--- a/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c
+++ b/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c
@@ -50,7 +50,9 @@ uint8_t ProcessConfigurationDescriptor(void)
 	uint8_t  ConfigDescriptorData[512];
 	void*    CurrConfigLocation = ConfigDescriptorData;
 	uint16_t CurrConfigBytesRem;
-	uint8_t  FoundEndpoints = 0;
+	
+	USB_Descriptor_Endpoint_t* DataINEndpoint  = NULL;
+	USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
 
 	/* Retrieve the entire configuration descriptor into the allocated buffer */
 	switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
@@ -65,47 +67,50 @@ uint8_t ProcessConfigurationDescriptor(void)
 			return ControlError;
 	}
 	
-	/* Get the MIDI Audio Streaming interface from the configuration descriptor */
+	/* Get the first MIDI interface from the configuration descriptor */
 	if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
 	                              DComp_NextMIDIStreamingInterface) != DESCRIPTOR_SEARCH_COMP_Found)
 	{
 		/* Descriptor not found, error out */
-		return NoCDCInterfaceFound;
+		return NoCompatibleInterfaceFound;
 	}
-	
-	/* Get the IN and OUT data endpoints for the MIDI interface */
-	while (FoundEndpoints != ((1 << MIDI_DATAPIPE_IN) | (1 << MIDI_DATAPIPE_OUT)))
+
+	while (!(DataINEndpoint) || !(DataOUTEndpoint))
 	{
-		/* Fetch the next bulk endpoint from the current MIDI streaming interface */
+		/* Get the next MIDI interface's data endpoint descriptor */
 		if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
 		                              DComp_NextMIDIStreamingDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
 		{
-			/* Descriptor not found, error out */
-			return NoEndpointFound;
+			/* Clear any found endpoints */
+			DataINEndpoint  = NULL;
+			DataOUTEndpoint = NULL;
+
+			/* Get the next Mass Storage interface from the configuration descriptor */
+			if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+										  DComp_NextMIDIStreamingInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+			{
+				/* Descriptor not found, error out */
+				return NoCompatibleInterfaceFound;
+			}
 		}
 		
+		/* Retrieve the endpoint address from the endpoint descriptor */
 		USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
 
-		/* Check if the endpoint is a bulk IN or bulk OUT endpoint */
+		/* If the endpoint is a IN type endpoint */
 		if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
-		{
-			/* Configure the data IN pipe */
-			Pipe_ConfigurePipe(MIDI_DATAPIPE_IN, EP_TYPE_BULK, PIPE_TOKEN_IN,
-							   EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-			
-			/* Set the flag indicating that the data IN pipe has been found */
-			FoundEndpoints |= (1 << MIDI_DATAPIPE_IN);
-		}
+		  DataINEndpoint = EndpointData;
 		else
-		{
-			/* Configure the data OUT pipe */
-			Pipe_ConfigurePipe(MIDI_DATAPIPE_OUT, EP_TYPE_BULK, PIPE_TOKEN_OUT,
-							   EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-			
-			/* Set the flag indicating that the data OUT pipe has been found */
-			FoundEndpoints |= (1 << MIDI_DATAPIPE_OUT);
-		}
+		  DataOUTEndpoint = EndpointData;
 	}
+	
+	/* Configure the MIDI data IN pipe */
+	Pipe_ConfigurePipe(MIDI_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
+	                   DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE);
+
+	/* Configure the MIDI data OUT pipe */
+	Pipe_ConfigurePipe(MIDI_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
+					   DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_SINGLE);
 
 	/* Valid data found, return success */
 	return SuccessfulConfigRead;