Demos/Host/Incomplete/BluetoothHost/ConfigDescriptor.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all 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[512];
  36         void*    CurrConfigLocation = ConfigDescriptorData;
  37         uint16_t CurrConfigBytesRem;
  38         uint8_t  FoundEndpoints = 0;
  39
  40         /* Retrieve the entire configuration descriptor into the allocated buffer */
  41         switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
  42         {
  43                 case HOST_GETCONFIG_Successful:
  44                         break;
  45                 case HOST_GETCONFIG_InvalidData:
  46                         return InvalidConfigDataReturned;
  47                 case HOST_GETCONFIG_BuffOverflow:
  48                         return DescriptorTooLarge;
  49                 default:
  50                         return ControlErrorDuringConfigRead;
  51         }
  52
  53         /* The bluetooth USB transport addendum mandates that the data (not streaming voice) endpoints
  54            be in the first interface descriptor (interface 0) */
  55         USB_GetNextDescriptorOfType(&CurrConfigBytesRem, &CurrConfigLocation, DTYPE_Interface);
  56
  57         /* Ensure that an interface was found, and the end of the descriptor was not reached */
  58         if (!(CurrConfigBytesRem))
  59           return NoInterfaceFound;
  60
  61         /* Get the data IN, data OUT and event notification endpoints for the bluetooth interface */
  62         while (FoundEndpoints != ((1 << BLUETOOTH_DATA_IN_PIPE) | (1 << BLUETOOTH_DATA_OUT_PIPE) |
  63                                   (1 << BLUETOOTH_EVENTS_PIPE)))
  64         {
  65                 /* Fetch the next endpoint from the current bluetooth interface */
  66                 if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
  67                                               NextInterfaceBluetoothDataEndpoint))
  68                 {
  69                         /* Descriptor not found, error out */
  70                         return NoEndpointFound;
  71                 }
  72
  73                 USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
  74
  75                 /* Check if the endpoint is a bulk or interrupt type endpoint */
  76                 if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
  77                 {
  78                         if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
  79                         {
  80                                 /* Configure the events IN pipe */
  81                                 Pipe_ConfigurePipe(BLUETOOTH_EVENTS_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
  82                                                                    EndpointData->EndpointAddress, EndpointData->EndpointSize,
  83                                                                    PIPE_BANK_SINGLE);
  84
  85                                 Pipe_SetInterruptPeriod(EndpointData->PollingIntervalMS);
  86
  87                                 /* Set the flag indicating that the events notification pipe has been found */
  88                                 FoundEndpoints |= (1 << BLUETOOTH_EVENTS_PIPE);
  89                         }
  90                 }
  91                 else
  92                 {
  93                         if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
  94                         {
  95                                 /* Configure the data IN pipe */
  96                                 Pipe_ConfigurePipe(BLUETOOTH_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
  97                                                                    EndpointData->EndpointAddress, EndpointData->EndpointSize,
  98                                                                    PIPE_BANK_SINGLE);
  99
 100                                 /* Set the flag indicating that the data IN pipe has been found */
 101                                 FoundEndpoints |= (1 << BLUETOOTH_DATA_IN_PIPE);
 102                         }
 103                         else
 104                         {
 105                                 /* Configure the data OUT pipe */
 106                                 Pipe_ConfigurePipe(BLUETOOTH_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
 107                                                                    EndpointData->EndpointAddress, EndpointData->EndpointSize,
 108                                                                    PIPE_BANK_SINGLE);
 109
 110                                 /* Set the flag indicating that the data OUT pipe has been found */
 111                                 FoundEndpoints |= (1 << BLUETOOTH_DATA_OUT_PIPE);
 112                         }
 113                 }
 114
 115         }
 116
 117         /* Valid data found, return success */
 118         return SuccessfulConfigRead;
 119 }
 120
 121 uint8_t NextInterfaceBluetoothDataEndpoint(void* CurrentDescriptor)
 122 {
 123         /* PURPOSE: Find next interface endpoint descriptor before next interface descriptor */
 124
 125         if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
 126           return DESCRIPTOR_SEARCH_Found;
 127         else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
 128           return DESCRIPTOR_SEARCH_Fail;
 129
 130         return DESCRIPTOR_SEARCH_NotFound;
 131 }
 132