-/*
- LUFA Library
- Copyright (C) Dean Camera, 2012.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2012 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"
-
-/** 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 BT interface descriptor containing bulk IN and OUT data endpoints.
- *
- * \return An error code from the \ref BluetoothHost_GetConfigDescriptorDataCodes_t enum.
- */
-uint8_t ProcessConfigurationDescriptor(void)
-{
- uint8_t ConfigDescriptorData[512];
- void* CurrConfigLocation = ConfigDescriptorData;
- uint16_t CurrConfigBytesRem;
-
- USB_Descriptor_Endpoint_t* DataINEndpoint = NULL;
- USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
- USB_Descriptor_Endpoint_t* EventsEndpoint = 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 DevControlError;
- }
-
- /* The Bluetooth USB transport addendum mandates that the data (not streaming voice) endpoints
- be in the first interface descriptor (interface 0) */
- USB_GetNextDescriptorOfType(&CurrConfigBytesRem, &CurrConfigLocation, DTYPE_Interface);
-
- /* Ensure that an interface was found, and the end of the descriptor was not reached */
- if (!(CurrConfigBytesRem))
- return NoCompatibleInterfaceFound;
-
- while (!(DataINEndpoint) || !(DataOUTEndpoint))
- {
- /* Get the next Bluetooth interface's data endpoint descriptor */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextInterfaceBluetoothDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
- {
- /* Data endpoints not found within the first bluetooth device interface, error out */
- return NoCompatibleInterfaceFound;
- }
-
- /* 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_DIR_MASK) == ENDPOINT_DIR_IN)
- {
- /* Check if the found endpoint is a interrupt or bulk type descriptor */
- if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
- EventsEndpoint = EndpointData;
- else
- DataINEndpoint = EndpointData;
- }
- else
- {
- DataOUTEndpoint = EndpointData;
- }
- }
-
- /* Configure the Bluetooth data IN pipe */
- Pipe_ConfigurePipe(BLUETOOTH_DATA_IN_PIPE, EP_TYPE_BULK, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, 1);
-
- /* Configure the Bluetooth data OUT pipe */
- Pipe_ConfigurePipe(BLUETOOTH_DATA_OUT_PIPE, EP_TYPE_BULK, DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, 1);
-
- /* Configure the Bluetooth events pipe */
- Pipe_ConfigurePipe(BLUETOOTH_EVENTS_PIPE, EP_TYPE_INTERRUPT, EventsEndpoint->EndpointAddress, EventsEndpoint->EndpointSize, 1);
- Pipe_SetInterruptPeriod(EventsEndpoint->PollingIntervalMS);
-
- /* 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 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_NextInterfaceBluetoothDataEndpoint(void* CurrentDescriptor)
-{
- USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
-
- /* Determine the type of the current descriptor */
- if (Header->Type == DTYPE_Endpoint)
- return DESCRIPTOR_SEARCH_Found;
- else if (Header->Type == DTYPE_Interface)
- return DESCRIPTOR_SEARCH_Fail;
- else
- return DESCRIPTOR_SEARCH_NotFound;
-}
-
projects / pub / lufa.git / blobdiff