Copy over schedulerless host demos to ClassDrivers directory, for later modification to new Host mode USB class drivers.

Demos/Host/ClassDriver/KeyboardHost/ConfigDescriptor.c

@@ -0,0 +1,145 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2009.
+              
+  dean [at] fourwalledcubicle [dot] com
+      www.fourwalledcubicle.com
+*/
+
+/*
+  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, and distribute this software
+  and its documentation for any purpose and without fee is hereby
+  granted, 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"
+
+/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This
+ *  routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate
+ *  with compatible devices.
+ *
+ *  This routine searches for a HID interface descriptor containing at least one Interrupt type IN endpoint.
+ *
+ *  \return An error code from the KeyboardHost_GetConfigDescriptorDataCodes_t enum.
+ */
+uint8_t ProcessConfigurationDescriptor(void)
+{
+	uint8_t* ConfigDescriptorData;
+	uint16_t ConfigDescriptorSize;
+	
+	/* Get Configuration Descriptor size from the device */
+	if (USB_GetDeviceConfigDescriptor(&ConfigDescriptorSize, NULL) != HOST_SENDCONTROL_Successful)
+	  return ControlError;
+	
+	/* Ensure that the Configuration Descriptor isn't too large */
+	if (ConfigDescriptorSize > MAX_CONFIG_DESCRIPTOR_SIZE)
+	  return DescriptorTooLarge;
+	  
+	/* Allocate enough memory for the entire config descriptor */
+	ConfigDescriptorData = alloca(ConfigDescriptorSize);
+
+	/* Retrieve the entire configuration descriptor into the allocated buffer */
+	USB_GetDeviceConfigDescriptor(&ConfigDescriptorSize, ConfigDescriptorData);
+	
+	/* Validate returned data - ensure first entry is a configuration header descriptor */
+	if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration)
+	  return InvalidConfigDataReturned;
+	
+	/* Get the keyboard interface from the configuration descriptor */
+	if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
+	                              DComp_NextKeyboardInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+	{
+		/* Descriptor not found, error out */
+		return NoHIDInterfaceFound;
+	}
+
+	/* Get the keyboard interface's data endpoint descriptor */
+	if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
+	                              DComp_NextInterfaceKeyboardDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
+	{
+		/* Descriptor not found, error out */
+		return NoEndpointFound;
+	}
+	
+	/* Retrieve the endpoint address from the endpoint descriptor */
+	USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(ConfigDescriptorData, USB_Descriptor_Endpoint_t);
+
+	/* Configure the keyboard data pipe */
+	Pipe_ConfigurePipe(KEYBOARD_DATAPIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
+	                   EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
+
+	Pipe_SetInfiniteINRequests();
+			
+	/* Valid data found, return success */
+	return SuccessfulConfigRead;
+}
+
+/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
+ *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
+ *  descriptor processing if an incompatible descriptor configuration is found.
+ *
+ *  This comparator searches for the next Interface descriptor of the correct Keyboard HID Class and Protocol values.
+ *
+ *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextKeyboardInterface(void* CurrentDescriptor)
+{
+	if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
+	{
+		/* Check the HID descriptor class and protocol, break out if correct class/protocol interface found */
+		if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class    == KEYBOARD_CLASS) &&
+		    (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == KEYBOARD_PROTOCOL))
+		{
+			return DESCRIPTOR_SEARCH_Found;
+		}
+	}
+	
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+
+/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
+ *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
+ *  descriptor processing if an incompatible descriptor configuration is found.
+ *
+ *  This comparator searches for the next IN Endpoint descriptor inside the current interface descriptor,
+ *  aborting the search if another interface descriptor is found before the required endpoint.
+ *
+ *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextInterfaceKeyboardDataEndpoint(void* CurrentDescriptor)
+{
+	if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
+	{
+		if (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Endpoint_t).EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
+		  return DESCRIPTOR_SEARCH_Found;
+	}
+	else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
+	{
+		return DESCRIPTOR_SEARCH_Fail;
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}