蓝牙Log中的关键字

1  蓝牙搜索

bt_btif : btif_dm_start_discovery : pairing_cb.state: 0x0

bt_btif : bta_sys_event: Event 0x200

bt_btif : bta_dm_search_sm_execute state:0, event:0x200

bt_btif : bta_dm_search_start avoid_scatter=1

bt_btif : bta_dm_search_start status=1

2 配对

 

BluetoothDevice: createBond() for device 1C:52:16:6E:AA:E5 called by pid: 10769 tid: 10769

bt_btif : btif_dm_create_bond: bd_addr=1c:52:16:6e:aa:e5, transport=0

BluetoothBondStateMachine: Bond address is:1C:52:16:6E:AA:E5

BluetoothBondStateMachine: Entering PendingCommandState State

BluetoothBondStateMachine: bondStateChangeCallback: Status: 0 Address: 1C:52:16:6E:AA:E5 newState: 1

BluetoothBondStateMachine: Bond State Change Intent:1C:52:16:6E:AA:E5 OldState: 10 NewState: 11

BluetoothBondStateMachine: sspRequestCallback: [B@e37d1cf name: [B@4cb975c cod: 2360324 pairingVariant 2 passkey: 259628

 

3 蓝牙发送文件

 

BluetoothOppReceiver: Action :android.bluetooth.devicepicker.action.DEVICE_SELECTED

//选择远端设备

BtOppTransfer:  Action :android.bluetooth.device.action.SDP_RECORD

BtOppTransfer: Aaron: Received UUID: 00001105-0000-1000-8000-00805f9b34fb

 BtOppTransfer: Aaron: expected UUID: 00001105-0000-1000-8000-00805f9b34fb

// 搜索出来远端设备的UUID， 1105，表示远端设备支持OPP协议

BtOppObexClient: Remote accept

// 远端设备接收。

4 蓝牙接收文件

 

ObexServerSockets2: Accepting socket connection...

ObexServerSockets2: Accepted socket connection from: ServerSocket: Type: TYPE_L2CAP Channel: 4131

接受socket的连接请求，选择L2CAP作为传输通道

 BtOppObexServer: Aaron: Create ServerSession with transport com.android.bluetooth.BluetoothObexTransport@bb5a7f0

 BtOppObexServer: Aaron: onConnect

BtOppObexServer: Aaron: onPut javax.obex.ServerOperation@5f8248f

BtOppObexServer: Aaron: onPut(), name = IMG_20180207_050410.jpg, length = 561910, mimeType = image/jpeg

//开始接收

BtOppObexServer: onDisconnect

BtOppObexServer: onClose

//接收完成

5 蓝牙耳机听歌

 

A2dpStateMachine: Connection state 94:CE:2C:F9:63:CB: 0->1

A2dpStateMachine: Connection state 94:CE:2C:F9:63:CB: 1->2

状态从0变为1，从1变为2,当变为2的时候，表示蓝牙耳机已经连接上

APM_AudioPolicyManager: setOutputDevice() device 0080 delayMs 0

音频通道的口选择为0x80，表示是a2dp

bt_a2dp_hw: start_audio_datapath: state 5

bt_a2dp_hw: start_audio_datapath: state AUDIO_A2DP_STATE_STANDBY

bt_a2dp_hw: a2dp_command: A2DP COMMAND A2DP_CTRL_CMD_START, fail count 0

// 给btif下发start的命令

btif_a2dp_ctrl_cb: A2DP-CTRL-CHANNEL EVENT UIPC_RX_DATA_READY_EVT

btif_a2dp_recv_ctrl_data: A2DP_CTRL_CMD_START

create_server_socket /data/misc/bluedroid/.a2dp_data

// 当收到start的命令的时候，注册data的socket的通道

bta_sys_event: Event 0x1231  

bta_av_co_audio_src_data_path: codec: SBC

bta_av_dup_audio_buf: data not to dup

// sbc格式的编码

AVDT_WriteReqOpt: handle=1 timestamp=0 m_pt=0x60 opt=0x0

L2CA_DataWrite()  CID: 0x004d  Len: 608

// 将数据写到L2CAP层

A2dpStateMachine: A2DP Playing state : device: 94:CE:2C:F9:63:CB State:11->10

状态从11变为10, 表示音乐处于播放状态。

6 蓝牙耳机打电话

 

HeadsetStateMachine: Connection state 94:CE:2C:F9:63:CB: 0->1

HeadsetStateMachine: Connection state 94:CE:2C:F9:63:CB: 1->2

状态从0变为1，从1变为2,当变为2的时候，表示蓝牙耳机已经连接上

APM_AudioPolicyManager: setOutputDevice() device 0020 delayMs 100

音频通道的口选择为0x20，表示是sco

HeadsetStateMachine: Audio state 94:CE:2C:F9:63:CB: 11->12

Audio的状态变为12， 表示电话接通

HeadsetStateMachine: Audio state 94:CE:2C:F9:63:CB: 12->10

Audio的状态变为11， 表示电话被挂断

 

蓝牙耳机连接之后，HFP里面最基本的三个AT指令，AT+BRSF, AT+CIND=?, AT+CIND?