Android蓝牙协议

1、Android蓝牙协议栈Android蓝牙协议栈使用的是BlueZ,支持GAP,SDP,andRFCOM觑范，是一个SIG认证的蓝牙协议栈。Bluez是GPL许可的，因此Android的框架内与用户空间的bluez代码通过D-BUS程通讯进行交互，以避免专有代码。Headset和Handsfree(v1.5)规范就在Android框架中实现白它是跟PhoneApp紧密耦合的。这些规范也是SIG认证的。下面的图表提供了一个以库为导向的蓝牙栈视图ApplicationsSetting。APPRhoneAppLibraries(userspace)BUSLinuxKernelHardware实线框的

2、是Android模块，红色虚线部分为合作伙伴指定模块(译者注：芯片商提供)下面的图表是以进程为导向视图:AndroidBluetoothArchitectureJavacve*+UrapacD(Mwun9T5灯序htodwrAon10SDK.UluelpgPrQfrES*NndKnCmJkrtdrtldIPC一fflTRMW置岁tI4rsi?电rVon，HFGOM廿SCOLZCAPHC1中w片(Gpnelxlooch哂&w百亨一A|AFALUETOOIM)移植BlueZ是兼容蓝牙2.1的，可以工作在任何2.1芯片以及向后兼容的旧的蓝牙版本。有要有两个方面: 串口驱动UARTdriver 蓝牙电

3、源开/关BluetoothPowerOn/Off串口驱动BlueZ核心子系统使用hciattach守护进程添加你的指定硬件串口驱动。例如，MSM7201A这个文件是在drivers/serial/msm_serial.c。你还需要通过修改init.rc为hciattach来编辑命令行选项。蓝牙电源开/关蓝牙芯片的电源开关方法1.0和Post1.0是不同的，具体如下： 1.0:Android框架写0或1至U/sys/modules/board_PLATFORM/parameters/bluetooth_power_on Post1.0:Android框架使用linuxrfkillAPI,参考ar

4、ch/arm/mach-msm/board-trout-rfkill.c例子。编译编译Android打开蓝牙支持，添加下面这行内容到BoardConfig.mkBOARD_HAVE_BLUETOOTH:=true解决问题调试调试你的蓝牙实现，可以通过读跟蓝牙相关的logs(adblogcat)和查找ERRO和警告消息。Android使用Bluez,同时会带来一些有用的调式工具。下面的片段为了提供一个建议的例子：hciconfig-a# printBTchipsetaddressandfeatures.UsefultocheckifyoucancommunicatewithyourBTchips

5、et.hcidump-XVt# printliveHCIUARTtraffic.hcitoolscan# scanforlocaldevices.UsefultocheckifRX/TXworks.l2pingADDRESS# pinganotherBTdevice.UsefultocheckifRX/TXworks.sdptoolrecordsADDRESSrequesttheSDPrecordsofanotherBTdevice.守护进程日志hcid(STDOUTW口hciattach(STDERR)的守护进程日志缺省是被写到/dev/null。编辑init.rc和init.PLATFOR

6、M.rc在logwrapper下运行这些守护进程，把它们输出到logcat。hciconfig-a和hcitool如果你编译你自己的system.img,除了hcitool扫描不行，hciconfig-a是可以工作的，尝试安装固件到蓝牙芯片XXXTBD工具BlueZ为调试和与蓝牙子系统通信提供很多设置命令行工具，包含下面这些：hciconfighcitoolhcidumpsdptooldbus-senddbus-monitor特性支持这一部分提供在每个android版本中的蓝牙的一些变化，主要是一些性能参数上的东西，就不翻译了。Android1.0releasePlatformfeatures

7、 BasedonBluez3.36andLinuxKernel2.6.25 Bluetooth2.0+EDRhoststack HeadsetProfile1.0inAudioGatewayrole HandsfreeProfile1.5inAudioGatewayroleoThree-waycallingoPhonebookoverATcommandsQualifications QDIDB014524:Hoststack(SDP,L2CAP,GAP,RFCOMM,SPP) QDIDB014624:EPLforHTCDream(HSP,HFP)ExampleproductsHTCDream/

8、T-MobileG1Android1.1releaseNoBluetoothchangessince1.0Android1.5release(cupcake)PlatformfeaturesbBasedonBluez3.36withLinuxKernel2.6.27bBluetooth2.0+EDRhoststackoSupportforauto-pairingwith0000devices HeadsetProfile1.1inAudioGatewayrole HandsfreeProfile1.5inAudioGatewayroleoThree-waycallingoPhonebookov

9、erATcommandsoVolumesynchronizationoeSCOoExtensivebugfixesandcompatibilityimprovements StereoBluetooth(A2DP1.2)inSourceroleoAVDTP1.2inAcceptorandInitiatorrolesoGAVDTP1.0inAcceptorandInitiatorroleso44.1khz,stereo,softwareSBCcodec RemoteControl(AVRCP1.0)inTargetroleoAVCTP1.3inTargetroleoplay/pause/stop

10、/prev/nextQualifications QDIDB015261:Hoststack(SDP,L2CAP,GAP,RFCOMM,SPP,AVCTP,AVRCP,GAVDP,AVDTP,A2DP) QDIDB015262:EPLforHTCSapphire(HSP,HFP)Android2.0/2.1release(eclair)Platformfeatures BasedonBluez4.47withLinuxKernel2.6.29 Bluetooth2.1+EDRhoststackoSupportforauto-pairingwith0000devicesoSupportforSi

11、mpleSecurePairing HeadsetProfile1.1inAudioGatewayrole HandsfreeProfile1.5inAudioGatewayroleoThree-waycalling0PhonebookoverATcommands0VolumesynchronizationoeSCOoExtensivebugfixesandcompatibilityimprovements StereoBluetooth(A2DP1.2)inSourceroleoAVDTP1.2inAcceptorandInitiatorrolesoGAVDTP1.0inAcceptoran

12、dInitiatorroleso44.1khz,stereo,softwareSBCcodec RemoteControl(AVRCP1.0)inTargetroleoAVCTP1.3inTargetroleoplay/pause/stop/prev/next ObjectPushProfileversion1.1oAddsabilitytotransferpictures,videosoTransferofcontactsusingvCardisnotsupportedinthisrelease. PhoneBookAddressProfileversion1.0oPhoneBookServ

13、erEquipment(PSE)rolesupported UsingJavaBluetoothAPIs,anAndroidapplicationcanpeformthefollowing:oScanforotherBluetoothdevicesoQuerythelocalBluetoothadapterforpairedBluetoothdevicesoEstablishRFCOMMchannelsoConnecttootherdevicesthroughservicediscoveryoTransferdatatoandfromotherdevicesoManagemultiplecon

14、nectionsSSupportforBluetoothenabledcaranddeskdocksoFrameworksupportforroutingPhoneCallAudioandA2DPstreamingusingcaranddeskdocks.Android2.2release(Froyo)Platformfeatures BasedonBluez4.47withLinuxKernel2.6.32 Nonewprofilesadded. AddedabilitytosharecontactsusingvCard Addedabilitytoexportallcontacts-usefultotransfercontactstocarkits Improvedcompatibilitywithheadsetsandcarkits.FuturereleasesThissectionoffersaroughguideofwhichfeaturestheteamisdevelopingforthenextrelease.Thisfeaturelistmaychangewithoutnoti