Demos/BluetoothHost/ConfigDescriptor.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 #include "ConfigDescriptor.h"
  32
  33 uint8_t ProcessConfigurationDescriptor(void)
  34 {
  35         uint8_t* ConfigDescriptorData;
  36         uint16_t ConfigDescriptorSize;
  37         uint8_t  FoundEndpoints = 0;
  38
  39         /* Get Configuration Descriptor size from the device */
  40         if (USB_Host_GetDeviceConfigDescriptor(&ConfigDescriptorSize, NULL) != HOST_SENDCONTROL_Successful)
  41           return ControlErrorDuringConfigRead;
  42
  43         /* Ensure that the Configuration Descriptor isn't too large */
  44         if (ConfigDescriptorSize > MAX_CONFIG_DESCRIPTOR_SIZE)
  45           return DescriptorTooLarge;
  46
  47         /* Allocate enough memory for the entire config descriptor */
  48         ConfigDescriptorData = alloca(ConfigDescriptorSize);
  49
  50         /* Retrieve the entire configuration descriptor into the allocated buffer */
  51         USB_Host_GetDeviceConfigDescriptor(&ConfigDescriptorSize, ConfigDescriptorData);
  52
  53         /* Validate returned data - ensure first entry is a configuration header descriptor */
  54         if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration)
  55           return InvalidConfigDataReturned;
  56
  57         /* The bluetooth USB transport addendium mandates that the data (not streaming voice) endpoints
  58            be in the first interface descriptor (interface 0) */
  59         USB_Host_GetNextDescriptorOfType(&ConfigDescriptorSize, &ConfigDescriptorData, DTYPE_Interface);
  60
  61         /* Ensure that an interface was found, and the end of the descriptor was not reached */
  62         if (!(ConfigDescriptorSize))
  63           return NoInterfaceFound;
  64
  65         /* Get the data IN, data OUT and event notification endpoints for the bluetooth interface */
  66         while (FoundEndpoints != ((1 << BLUETOOTH_DATA_IN_PIPE) | (1 << BLUETOOTH_DATA_OUT_PIPE) |
  67                                   (1 << BLUETOOTH_EVENTS_PIPE)))
  68         {
  69                 /* Fetch the next endpoint from the current bluetooth interface */
  70                 if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
  71                                                    NextInterfaceBluetoothDataEndpoint))
  72                 {
  73                         /* Descriptor not found, error out */
  74                         return NoEndpointFound;
  75                 }
  76
  77                 USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(ConfigDescriptorData, USB_Descriptor_Endpoint_t);
  78
  79                 /* Check if the endpoint is a bulk or interrupt type endpoint */
  80                 if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
  81                 {
  82                         if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
  83                         {
  84                                 /* Configure the events IN pipe */
  85                                 Pipe_ConfigurePipe(BLUETOOTH_EVENTS_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
  86                                                                    EndpointData->EndpointAddress, EndpointData->EndpointSize,
  87                                                                    PIPE_BANK_SINGLE);
  88
  89                                 Pipe_SetInfiniteINRequests();
  90                                 Pipe_SetInterruptPeriod(EndpointData->PollingIntervalMS);
  91
  92                                 /* Set the flag indicating that the events notification pipe has been found */
  93                                 FoundEndpoints |= (1 << BLUETOOTH_EVENTS_PIPE);
  94                         }
  95                 }
  96                 else
  97                 {
  98                         if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
  99                         {
 100                                 /* Configure the data IN pipe */
 101                                 Pipe_ConfigurePipe(BLUETOOTH_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
 102                                                                    EndpointData->EndpointAddress, EndpointData->EndpointSize,
 103                                                                    PIPE_BANK_SINGLE);
 104
 105                                 Pipe_SetInfiniteINRequests();
 106
 107                                 /* Set the flag indicating that the data IN pipe has been found */
 108                                 FoundEndpoints |= (1 << BLUETOOTH_DATA_IN_PIPE);
 109                         }
 110                         else
 111                         {
 112                                 /* Configure the data OUT pipe */
 113                                 Pipe_ConfigurePipe(BLUETOOTH_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
 114                                                                    EndpointData->EndpointAddress, EndpointData->EndpointSize,
 115                                                                    PIPE_BANK_SINGLE);
 116
 117                                 /* Set the flag indicating that the data OUT pipe has been found */
 118                                 FoundEndpoints |= (1 << BLUETOOTH_DATA_OUT_PIPE);
 119                         }
 120                 }
 121
 122         }
 123
 124         /* Valid data found, return success */
 125         return SuccessfulConfigRead;
 126 }
 127
 128 DESCRIPTOR_COMPARATOR(NextInterfaceBluetoothDataEndpoint)
 129 {
 130         /* PURPOSE: Find next interface endpoint descriptor before next interface descriptor */
 131
 132         if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
 133           return Descriptor_Search_Found;
 134         else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
 135           return Descriptor_Search_Fail;
 136
 137         return Descriptor_Search_NotFound;
 138 }
 139