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235 lines
9.2 KiB
235 lines
9.2 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2013.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2013 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations
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* needed to communication with an attached USB device. Descriptors are special computer-readable structures
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* which the host requests upon device enumeration, to determine the device's capabilities and functions.
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*/
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#include "ConfigDescriptor.h"
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/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This
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* routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate
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* with compatible devices.
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*
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* This routine searches for a CDC interface descriptor containing bulk data IN and OUT endpoints, and an interrupt event endpoint.
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*
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* \return An error code from the \ref CDCHost_GetConfigDescriptorDataCodes_t enum.
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*/
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uint8_t ProcessConfigurationDescriptor(void)
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{
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uint8_t ConfigDescriptorData[512];
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void* CurrConfigLocation = ConfigDescriptorData;
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uint16_t CurrConfigBytesRem;
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USB_Descriptor_Interface_t* CDCControlInterface = NULL;
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USB_Descriptor_Endpoint_t* DataINEndpoint = NULL;
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USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
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USB_Descriptor_Endpoint_t* NotificationEndpoint = NULL;
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/* Retrieve the entire configuration descriptor into the allocated buffer */
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switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
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{
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case HOST_GETCONFIG_Successful:
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break;
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case HOST_GETCONFIG_InvalidData:
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return InvalidConfigDataReturned;
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case HOST_GETCONFIG_BuffOverflow:
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return DescriptorTooLarge;
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default:
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return ControlError;
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}
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while (!(DataINEndpoint) || !(DataOUTEndpoint) || !(NotificationEndpoint))
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{
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/* See if we've found a likely compatible interface, and if there is an endpoint within that interface */
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if (!(CDCControlInterface) ||
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USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
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DComp_NextCDCDataInterfaceEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
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{
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/* Check if we have already found the control interface's notification endpoint or not */
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if (NotificationEndpoint)
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{
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/* Get the next CDC data interface from the configuration descriptor */
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if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
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DComp_NextCDCDataInterface) != DESCRIPTOR_SEARCH_COMP_Found)
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{
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/* Descriptor not found, error out */
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return NoCompatibleInterfaceFound;
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}
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/* Clear any found endpoints */
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DataINEndpoint = NULL;
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DataOUTEndpoint = NULL;
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}
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else
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{
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/* Get the next CDC control interface from the configuration descriptor */
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if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
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DComp_NextCDCControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
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{
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/* Descriptor not found, error out */
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return NoCompatibleInterfaceFound;
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}
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/* Save the interface in case we need to refer back to it later */
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CDCControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
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/* Clear any found endpoints */
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NotificationEndpoint = NULL;
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}
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/* Skip the remainder of the loop as we have not found an endpoint yet */
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continue;
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}
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/* Retrieve the endpoint address from the endpoint descriptor */
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USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
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/* If the endpoint is a IN type endpoint */
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if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN)
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{
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/* Check if the found endpoint is a interrupt or bulk type descriptor */
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if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
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NotificationEndpoint = EndpointData;
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else
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DataINEndpoint = EndpointData;
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}
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else
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{
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DataOUTEndpoint = EndpointData;
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}
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}
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/* Configure the CDC data IN pipe */
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Pipe_ConfigurePipe(CDC_DATA_IN_PIPE, EP_TYPE_BULK, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, 1);
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/* Configure the CDC data OUT pipe */
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Pipe_ConfigurePipe(CDC_DATA_OUT_PIPE, EP_TYPE_BULK, DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, 1);
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/* Configure the CDC notification pipe */
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Pipe_ConfigurePipe(CDC_NOTIFICATION_PIPE, EP_TYPE_INTERRUPT, NotificationEndpoint->EndpointAddress, NotificationEndpoint->EndpointSize, 1);
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Pipe_SetInterruptPeriod(NotificationEndpoint->PollingIntervalMS);
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/* Valid data found, return success */
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return SuccessfulConfigRead;
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}
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/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
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* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
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* descriptor processing if an incompatible descriptor configuration is found.
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*
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* This comparator searches for the next Interface descriptor of the correct CDC control Class, Subclass and Protocol values.
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*
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* \return A value from the DSEARCH_Return_ErrorCodes_t enum
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*/
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uint8_t DComp_NextCDCControlInterface(void* CurrentDescriptor)
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{
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USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
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if (Header->Type == DTYPE_Interface)
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{
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USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
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/* Check the CDC descriptor class, subclass and protocol, break out if correct control interface found */
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if ((Interface->Class == CDC_CSCP_CDCClass) &&
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(Interface->SubClass == CDC_CSCP_ACMSubclass) &&
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(Interface->Protocol == CDC_CSCP_ATCommandProtocol))
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{
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return DESCRIPTOR_SEARCH_Found;
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}
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}
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return DESCRIPTOR_SEARCH_NotFound;
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}
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/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
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* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
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* descriptor processing if an incompatible descriptor configuration is found.
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*
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* This comparator searches for the next Interface descriptor of the correct CDC data Class, Subclass and Protocol values.
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*
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* \return A value from the DSEARCH_Return_ErrorCodes_t enum
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*/
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uint8_t DComp_NextCDCDataInterface(void* CurrentDescriptor)
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{
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USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
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if (Header->Type == DTYPE_Interface)
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{
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USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
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/* Check the CDC descriptor class, subclass and protocol, break out if correct data interface found */
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if ((Interface->Class == CDC_CSCP_CDCDataClass) &&
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(Interface->SubClass == CDC_CSCP_NoDataSubclass) &&
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(Interface->Protocol == CDC_CSCP_NoDataProtocol))
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{
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return DESCRIPTOR_SEARCH_Found;
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}
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}
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return DESCRIPTOR_SEARCH_NotFound;
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}
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/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
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* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
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* descriptor processing if an incompatible descriptor configuration is found.
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*
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* This comparator searches for the next bulk IN or OUT endpoint, or interrupt IN endpoint within the current interface,
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* aborting the search if another interface descriptor is found before the required endpoint (so that it may be compared
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* using a different comparator to determine if it is another CDC class interface).
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*
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* \return A value from the DSEARCH_Return_ErrorCodes_t enum
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*/
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uint8_t DComp_NextCDCDataInterfaceEndpoint(void* CurrentDescriptor)
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{
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USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
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if (Header->Type == DTYPE_Endpoint)
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{
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USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);
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if (((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_BULK) ||
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((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT))
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{
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return DESCRIPTOR_SEARCH_Found;
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}
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}
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else if (Header->Type == DTYPE_Interface)
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{
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return DESCRIPTOR_SEARCH_Fail;
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}
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return DESCRIPTOR_SEARCH_NotFound;
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}
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