Android Bluetooth How To--Based on Android L Bluedroid

Android Bluetooth How To(Based on Android L Bluedroid)

持续更新中…

1、How to enable btsnoop log?

a) UI Settings-->

b)  Developer Options-->

c)  reboot Tablet, then snoop log will locate in /sdcard/btsnoop_hci.log(this path can be configured in /etc/bluetooth/bt_stack.conf)

2、If developer options default not enabled, you can use following steps to enable it

a) Settings-->

b) About Tablet-->

c) Click 4 or 5 times or more in Build Number-->

d)then, Develop options will comeout-->

Pls also be noted that how to enable Developer Options might depend on system and Android Versions

3、bluedroid useful config files

a) bt_stack.conf

i.  此文件保存在/etc/bluetooth/目录下，用于配置抓取bluedroid协议栈log的方式和log的级别

b) bt_config.xml

i.此文件在/data/misc/bluedroid/目录下，保存了当前BT设备、扫描到的BT设备以及配对过的BT设备的信息，包括device name、BD_ADDR、link key、Report Descriptor(HID)等等

c)  bt_did.conf，/etc/Bluetooth/

i. Device ID (DID) configuration file，未被使用

d) auto_pair_devlist.conf，/etc/Bluetooth/

i. 保存blacklist和whitelist

4、How to enable & adjust bluedroid debug log level?

a) this should customized in /etc/bluetooth/bt_stack.conf

b) enable btsnoop log -->

i.set BtSnoopLogOutput to true

BtSnoopLogOutput=true

ii.  set BtSnoopFileName to path you want to save btsnoop log

BtSnoopFileName=/sdcard/btsnoop_hci.log

c) adjust trace & debug level

i.  set TraceConf to true

TraceConf=true

ii. 根据需要设置debug level，默认是2，通常debug的时候，都是将level默认设置为5来抓log，这样可以打出更多的信息(logcat)

TRC_BTM=5

TRC_HCI=5

TRC_L2CAP=5

TRC_RFCOMM=5

TRC_OBEX=5

TRC_AVCT=5

TRC_AVDT=5

TRC_AVRC=5

TRC_AVDT_SCB=5

TRC_AVDT_CCB=5

TRC_A2D=5

TRC_SDP=5

TRC_GATT=5

TRC_SMP=5

TRC_BTAPP=5

TRC_BTIF=5

5、Android Bluetooth相关code路径

a) bluedroid协议栈

i.   <Android Root>/external/bluetooth/bluedroid/

b) Bluetooth.apk

i.  <Android Root>/packages/apps/Bluetooth/

c) Settings.apk

i. <Android Root>/packages/apps/Settings/src/com/android/settings/bluetooth

d) hal头文件

i. <Android Root>/hardware/libhardware/include/hardware/bluetooth.h

ii. <Android Root>/hardware/libhardware/include/hardware/bt_*.h

e) framework相关

i.  <Android Root>/frameworks/base/core/java/android/bluetooth

ii.   <Android Root>/frameworks/base/services/core/java/com/android/server/ BluetoothManagerService.java

6、bluedroid build出来的binary

a) bluetooth.default.so

i. 这个协议栈的profile、stack所编译出来的，是bluedroid的精华所在

i.  由如下库文件组成，static lib (参考：bluedroid/main/Android.mk)

1. 1. 1. libbt-brcm_bta \ -> bluedroid/bta/Android.mk
      2. libbt-brcm_gki \ -> bluedroid/gki/Android.mk
      3. libbt-brcm_stack \ -> bluedroid/stack/Android.mk
      4. libbt-hci \ -> bluedroid/hci/Android.mk
      5. libbt-utils \ -> bluedroid/hci/Android.mk
      6. libbt-qcom_sbc_decoder \ -> bluedroid\embdrv\sbc\decoder\Android.mk
      7. libosi \ -> bluedroid/osi/Android.mk
      8. libtinyxml2 \

b) audio.a2dp.default.so

i. 这个是a2dp和audio的hal接口，-> bluedroid\audio_a2dp_hw\Android.mk

c) libbt-vendor.so

i.  vendor自己实现的，用于将bluedroid协议栈铜特定的芯片driver接起来

7、  Android BT基本架构