X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/cc9b190919abbc567cd179b31afeef565efb1f17..ea922c98d187eb74c31535afa3334ead5bd50526:/Demos/Host/Incomplete/AudioInputHost/ConfigDescriptor.c?ds=inline

diff --git a/Demos/Host/Incomplete/AudioInputHost/ConfigDescriptor.c b/Demos/Host/Incomplete/AudioInputHost/ConfigDescriptor.c
new file mode 100644
index 000000000..d0ca91a08
--- /dev/null
+++ b/Demos/Host/Incomplete/AudioInputHost/ConfigDescriptor.c
@@ -0,0 +1,183 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2011.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaim all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *
+ *  USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations
+ *  needed to communication with an attached USB device. Descriptors are special  computer-readable structures
+ *  which the host requests upon device enumeration, to determine the device's capabilities and functions.
+ */
+
+#include "ConfigDescriptor.h"
+
+uint8_t StreamingInterfaceIndex      = 0;
+uint8_t StreamingInterfaceAltSetting = 0;
+uint8_t StreamingEndpointAddress     = 0;
+
+uint8_t ProcessConfigurationDescriptor(void)
+{
+	uint8_t  ConfigDescriptorData[512];
+	void*    CurrConfigLocation = ConfigDescriptorData;
+	uint16_t CurrConfigBytesRem;
+
+	USB_Descriptor_Interface_t* AudioControlInterface   = NULL;
+	USB_Descriptor_Interface_t* AudioStreamingInterface = NULL;
+	USB_Descriptor_Endpoint_t*  DataINEndpoint          = NULL;
+
+	/* Retrieve the entire configuration descriptor into the allocated buffer */
+	switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
+	{
+		case HOST_GETCONFIG_Successful:
+			break;
+		case HOST_GETCONFIG_InvalidData:
+			return InvalidConfigDataReturned;
+		case HOST_GETCONFIG_BuffOverflow:
+			return DescriptorTooLarge;
+		default:
+			return ControlError;
+	}
+
+	while (!(DataINEndpoint))
+	{
+		if (!(AudioControlInterface) ||
+		    USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+		                              DComp_NextAudioInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
+		{
+			if (!(AudioControlInterface))
+			{
+				if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+											  DComp_NextAudioControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+				{
+					/* Descriptor not found, error out */
+					return NoCompatibleInterfaceFound;
+				}
+
+				/* Save the interface in case we need to refer back to it later */
+				AudioControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);			
+			}
+		
+			if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+										  DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+			{
+				if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+											  DComp_NextAudioControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+				{
+					/* Descriptor not found, error out */
+					return NoCompatibleInterfaceFound;
+				}
+
+				/* Save the interface in case we need to refer back to it later */
+				AudioControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+			}
+
+			/* Save the interface in case we need to refer back to it later */
+			AudioStreamingInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+
+			/* Skip the remainder of the loop as we have not found an endpoint yet */
+			continue;
+		}
+
+		/* Retrieve the endpoint address from the endpoint descriptor */
+		USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
+
+		/* If the endpoint is a IN type endpoint */
+		if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
+		  DataINEndpoint = EndpointData;
+	}
+
+	StreamingInterfaceIndex      = AudioStreamingInterface->InterfaceNumber;
+	StreamingInterfaceAltSetting = AudioStreamingInterface->AlternateSetting;
+	StreamingEndpointAddress     = DataINEndpoint->EndpointAddress;
+
+	/* Configure the HID data IN pipe */
+	Pipe_ConfigurePipe(AUDIO_DATA_IN_PIPE, EP_TYPE_ISOCHRONOUS, PIPE_TOKEN_IN,
+	                   DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_DOUBLE);
+
+	/* Valid data found, return success */
+	return SuccessfulConfigRead;
+}
+
+uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor)
+{
+	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
+	if (Header->Type == DTYPE_Interface)
+	{
+		USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
+
+		if ((Interface->Class    == AUDIO_CSCP_AudioClass) &&
+		    (Interface->SubClass == AUDIO_CSCP_ControlSubclass) &&
+		    (Interface->Protocol == AUDIO_CSCP_ControlProtocol))
+		{
+			return DESCRIPTOR_SEARCH_Found;
+		}
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+
+uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor)
+{
+	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
+	if (Header->Type == DTYPE_Interface)
+	{
+		USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
+
+		if ((Interface->Class    == AUDIO_CSCP_AudioClass) &&
+		    (Interface->SubClass == AUDIO_CSCP_AudioStreamingSubclass) &&
+		    (Interface->Protocol == AUDIO_CSCP_StreamingProtocol))
+		{
+			return DESCRIPTOR_SEARCH_Found;
+		}
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+
+uint8_t DComp_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor)
+{
+	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
+	if (Header->Type == DTYPE_Endpoint)
+	{
+		USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);
+
+		if ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_ISOCHRONOUS)
+		  return DESCRIPTOR_SEARCH_Found;
+	}
+	else if (Header->Type == DTYPE_Interface)
+	{
+		return DESCRIPTOR_SEARCH_Fail;
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+