Demos/Host/Incomplete/BluetoothHost/Lib/BluetoothHCICommands.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 #define  INCLUDE_FROM_BLUETOOTHHCICOMMANDS_C
  32 #include "BluetoothHCICommands.h"
  33
  34 static BT_HCICommand_Header_t HCICommandHeader;
  35
  36        uint8_t                       Bluetooth_HCIProcessingState;
  37 static uint8_t                       Bluetooth_HCINextState;
  38 static uint8_t                       Bluetooth_TempDeviceAddress[6];
  39
  40 void Bluetooth_HCITask(void)
  41 {
  42         switch (Bluetooth_HCIProcessingState)
  43         {
  44                 case Bluetooth_ProcessEvents:
  45                         Pipe_SelectPipe(BLUETOOTH_EVENTS_PIPE);
  46                         Pipe_Unfreeze();
  47
  48                         if (Pipe_IsReadWriteAllowed())
  49                         {
  50                                 BT_HCIEvent_Header_t HCIEventHeader;
  51
  52                                 /* Read in the event header to fetch the event code and payload length */
  53                                 Pipe_Read_Stream_LE(&HCIEventHeader, sizeof(HCIEventHeader));
  54
  55                                 /* Create a temporary buffer for the event parameters */
  56                                 uint8_t EventParams[HCIEventHeader.ParameterLength];
  57
  58                                 /* Read in the event parameters into the temporary buffer */
  59                                 Pipe_Read_Stream_LE(&EventParams, HCIEventHeader.ParameterLength);
  60                                 Pipe_ClearIN();
  61
  62                                 switch (HCIEventHeader.EventCode)
  63                                 {
  64                                         case EVENT_COMMAND_COMPLETE:
  65                                                 Bluetooth_HCIProcessingState = Bluetooth_HCINextState;
  66                                                 break;
  67                                         case EVENT_COMMAND_STATUS:
  68                                                 /* If the execution of a command failed, reset the stack */
  69                                                 if (((BT_HCIEvent_CommandStatus_t*)&EventParams)->Status)
  70                                                   Bluetooth_HCIProcessingState = Bluetooth_Init;
  71                                                 break;
  72                                         case EVENT_CONNECTION_REQUEST:
  73                                                 /* Need to store the remote device's BT address in a temporary buffer for later use */
  74                                                 memcpy(Bluetooth_TempDeviceAddress,
  75                                                        &((BT_HCIEvent_ConnectionRequest_t*)&EventParams)->RemoteAddress,
  76                                                        sizeof(Bluetooth_TempDeviceAddress));
  77
  78                                                 bool IsACLConnection = (((BT_HCIEvent_ConnectionRequest_t*)&EventParams)->LinkType == 0x01);
  79
  80                                                 /* Only accept the connection if it is a ACL (data) connection, a device is not already connected
  81                                                    and the user application has indicated that the connection should be allowed */
  82                                                 Bluetooth_HCIProcessingState = (Bluetooth_Connection.IsConnected || !(IsACLConnection) ||
  83                                                                                                             !(Bluetooth_ConnectionRequest(Bluetooth_TempDeviceAddress))) ?
  84                                                                                                            Bluetooth_Conn_RejectConnection : Bluetooth_Conn_AcceptConnection;
  85                                                 break;
  86                                         case EVENT_PIN_CODE_REQUEST:
  87                                                 /* Need to store the remote device's BT address in a temporary buffer for later use */
  88                                                 memcpy(Bluetooth_TempDeviceAddress,
  89                                                        &((BT_HCIEvent_PinCodeReq_t*)&EventParams)->RemoteAddress,
  90                                                        sizeof(Bluetooth_TempDeviceAddress));
  91
  92                                                 Bluetooth_HCIProcessingState = Bluetooth_Conn_SendPINCode;
  93                                                 break;
  94                                         case EVENT_CONNECTION_COMPLETE:
  95                                                 /* Need to store the remote device's BT address in a temporary buffer for later use */
  96                                                 memcpy(Bluetooth_Connection.RemoteAddress,
  97                                                        &((BT_HCIEvent_ConnectionComplete_t*)&EventParams)->RemoteAddress,
  98                                                        sizeof(Bluetooth_TempDeviceAddress));
  99
 100                                                 /* Store the created connection handle and indicate that the connection has been established */
 101                                                 Bluetooth_Connection.ConnectionHandle = ((BT_HCIEvent_ConnectionComplete_t*)&EventParams)->ConnectionHandle;
 102                                                 Bluetooth_Connection.IsConnected      = true;
 103
 104                                                 Bluetooth_ConnectionComplete();
 105                                                 break;
 106                                         case EVENT_DISCONNECTION_COMPLETE:
 107                                                 /* Device disconnected, indicate connection information no longer valid */
 108                                                 Bluetooth_Connection.IsConnected = false;
 109
 110                                                 Bluetooth_DisconnectionComplete();
 111
 112                                                 Bluetooth_HCIProcessingState = Bluetooth_Init;
 113                                                 break;
 114                                 }
 115                         }
 116
 117                         Pipe_Freeze();
 118
 119                         break;
 120                 case Bluetooth_Init:
 121                         /* Reset the connection information structure to destroy any previous connection state */
 122                         memset(&Bluetooth_Connection, 0x00, sizeof(Bluetooth_Connection));
 123
 124                         Bluetooth_HCIProcessingState = Bluetooth_Init_Reset;
 125                         break;
 126                 case Bluetooth_Init_Reset:
 127                         HCICommandHeader = (BT_HCICommand_Header_t)
 128                         {
 129                                 OpCode: {OGF: OGF_CTRLR_BASEBAND, OCF: OCF_CTRLR_BASEBAND_RESET},
 130                                 ParameterLength: 0,
 131                         };
 132
 133                         /* Send the command to reset the bluetooth dongle controller */
 134                         Bluetooth_SendHCICommand(NULL, 0);
 135
 136                         Bluetooth_HCINextState       = Bluetooth_Init_SetLocalName;
 137                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 138                         break;
 139                 case Bluetooth_Init_SetLocalName:
 140                         HCICommandHeader = (BT_HCICommand_Header_t)
 141                                 {
 142                                         OpCode: {OGF: OGF_CTRLR_BASEBAND, OCF: OCF_CTRLR_BASEBAND_WRITE_LOCAL_NAME},
 143                                         ParameterLength: 248,
 144                                 };
 145
 146                         /* Send the command to set the bluetooth dongle's name for other devices to see */
 147                         Bluetooth_SendHCICommand(Bluetooth_DeviceConfiguration.Name, strlen(Bluetooth_DeviceConfiguration.Name));
 148
 149                         Bluetooth_HCINextState       = Bluetooth_Init_SetDeviceClass;
 150                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 151                         break;
 152                 case Bluetooth_Init_SetDeviceClass:
 153                         HCICommandHeader = (BT_HCICommand_Header_t)
 154                                 {
 155                                         OpCode: {OGF: OGF_CTRLR_BASEBAND, OCF: OCF_CTRLR_BASEBAND_WRITE_CLASS_OF_DEVICE},
 156                                         ParameterLength: 3,
 157                                 };
 158
 159                         /* Send the command to set the class of the device for other devices to see */
 160                         Bluetooth_SendHCICommand(&Bluetooth_DeviceConfiguration.Class, 3);
 161
 162                         Bluetooth_HCINextState       = Bluetooth_Init_WriteScanEnable;
 163                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 164                         break;
 165                 case Bluetooth_Init_WriteScanEnable:
 166                         HCICommandHeader = (BT_HCICommand_Header_t)
 167                         {
 168                                 OpCode: {OGF: OGF_CTRLR_BASEBAND, OCF: OCF_CTRLR_BASEBAND_WRITE_SCAN_ENABLE},
 169                                 ParameterLength: 1,
 170                         };
 171
 172                         uint8_t Interval = BT_SCANMODE_InquiryAndPageScans;
 173
 174                         /* Send the command to set the remote device scanning mode */
 175                         Bluetooth_SendHCICommand(&Interval, 1);
 176
 177                         Bluetooth_HCINextState       = Bluetooth_ProcessEvents;
 178                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 179                         break;
 180                 case Bluetooth_Conn_AcceptConnection:
 181                         HCICommandHeader = (BT_HCICommand_Header_t)
 182                                 {
 183                                         OpCode: {OGF: OGF_LINK_CONTROL, OCF: OCF_LINK_CONTROL_ACCEPT_CONNECTION_REQUEST},
 184                                         ParameterLength: sizeof(BT_HCICommand_AcceptConnectionReq_t),
 185                                 };
 186
 187                         /* Copy over the temporary BT device address saved from the Connection Request event, indicate slave
 188                            connection role */
 189                         BT_HCICommand_AcceptConnectionReq_t AcceptConnectionParams;
 190                         memcpy(AcceptConnectionParams.RemoteAddress, Bluetooth_TempDeviceAddress,
 191                                sizeof(AcceptConnectionParams.RemoteAddress));
 192                         AcceptConnectionParams.SlaveRole = true;
 193
 194                         /* Send the command to accept the remote connection request */
 195                         Bluetooth_SendHCICommand(&AcceptConnectionParams, sizeof(BT_HCICommand_AcceptConnectionReq_t));
 196
 197                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 198                         break;
 199                 case Bluetooth_Conn_RejectConnection:
 200                         HCICommandHeader = (BT_HCICommand_Header_t)
 201                                 {
 202                                         OpCode: {OGF: OGF_LINK_CONTROL, OCF: OCF_LINK_CONTROL_REJECT_CONNECTION_REQUEST},
 203                                         ParameterLength: sizeof(BT_HCICommand_RejectConnectionReq_t),
 204                                 };
 205
 206                         /* Copy over the temporary BT device address saved from the Connection Request event, indicate failure
 207                            to accept the connection due to limited device resources or incorrect device address */
 208                         BT_HCICommand_RejectConnectionReq_t RejectConnectionParams;
 209                         memcpy(RejectConnectionParams.RemoteAddress, Bluetooth_TempDeviceAddress, sizeof(RejectConnectionParams.RemoteAddress));
 210                         RejectConnectionParams.Reason = Bluetooth_Connection.IsConnected ? ERROR_LIMITED_RESOURCES : ERROR_UNACCEPTABLE_BDADDR;
 211
 212                         /* Send the command to reject the remote connection request */
 213                         Bluetooth_SendHCICommand(&RejectConnectionParams, sizeof(BT_HCICommand_RejectConnectionReq_t));
 214
 215                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 216                         break;
 217                 case Bluetooth_Conn_SendPINCode:
 218                         HCICommandHeader = (BT_HCICommand_Header_t)
 219                                 {
 220                                         OpCode: {OGF: OGF_LINK_CONTROL, OCF: OCF_LINK_CONTROL_PIN_CODE_REQUEST_REPLY},
 221                                         ParameterLength: sizeof(BT_HCICommand_PinCodeResp_t),
 222                                 };
 223
 224                         /* Copy over the temporary BT device address saved from the PIN Code Request event, copy over the
 225                            local PIN authentication code to the response */
 226                         BT_HCICommand_PinCodeResp_t PINCodeRequestParams;
 227                         memcpy(PINCodeRequestParams.RemoteAddress, Bluetooth_TempDeviceAddress, sizeof(PINCodeRequestParams.RemoteAddress));
 228                         PINCodeRequestParams.PINCodeLength = strlen(Bluetooth_DeviceConfiguration.PINCode);
 229                         memcpy(PINCodeRequestParams.PINCode, Bluetooth_DeviceConfiguration.PINCode, sizeof(PINCodeRequestParams.PINCode));
 230
 231                         /* Send the command to transmit the device's local PIN number for authentication */
 232                         Bluetooth_SendHCICommand(&PINCodeRequestParams, sizeof(BT_HCICommand_PinCodeResp_t));
 233
 234                         Bluetooth_HCIProcessingState = Bluetooth_ProcessEvents;
 235                         break;
 236         }
 237 }
 238
 239 static uint8_t Bluetooth_SendHCICommand(void* Parameters, uint16_t ParameterLength)
 240 {
 241         /* Need to reserve the amount of bytes given in the header for the complete payload */
 242         uint8_t CommandBuffer[sizeof(HCICommandHeader) + HCICommandHeader.ParameterLength];
 243
 244         USB_ControlRequest = (USB_Request_Header_t)
 245                 {
 246                         .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_DEVICE),
 247                         .bRequest      = 0,
 248                         .wValue        = 0,
 249                         .wIndex        = 0,
 250                         .wLength       = sizeof(CommandBuffer)
 251                 };
 252
 253         /* Copy over the HCI command header to the allocated buffer */
 254         memcpy(CommandBuffer, &HCICommandHeader, sizeof(HCICommandHeader));
 255
 256         /* Zero out the parameter section of the response to ensure that any padding bytes do not expose private RAM contents */
 257         memset(&CommandBuffer[sizeof(HCICommandHeader)], 0x00, HCICommandHeader.ParameterLength);
 258
 259         /* Copy over the command parameters (if any) to the command buffer - note, the number of actual source parameter bytes
 260            may differ to those in the header; any difference in length is filled with 0x00 padding bytes */
 261         memcpy(&CommandBuffer[sizeof(HCICommandHeader)], Parameters, ParameterLength);
 262
 263         Pipe_SelectPipe(PIPE_CONTROLPIPE);
 264         return USB_Host_SendControlRequest(CommandBuffer);
 265 }