如何实现任意平台BlueZ5驱动移植
1，准备编译工作之前，需要了解什么是buildroot，跨平台的库与文件都通过buildroot来实现。
About Buildroot：Buildroot is a tool that simplifies and automates the process of building a complete Linux system for an embedded system, using cross-compilation.
In order to achieve this, Buildroot is able to generate a cross-compilation toolchain, a root filesystem, a Linux kernel image and a bootloader for your target. Buildroot can be used for any combination of these options, independently (you can for example use an existing cross-compilation toolchain, and build only your root filesystem with Buildroot).
Buildroot is useful mainly for people working with embedded systems. Embedded systems often use processors that are not the regular x86 processors everyone is used to having in his PC. They can be PowerPC processors, MIPS processors, ARM processors, etc.
Buildroot supports numerous processors and their variants; it also comes with default configurations for several boards available off-the-shelf. Besides this, a number of third-party projects are based on, or develop their BSP 1 or SDK 2 on top of Buildroot.
Buildroot信息：https://buildroot.org/
Linux下获取链接：
gitclonehttps://git.buildroot.net/buildroot gitclonegit://git.buildroot.net/buildroot
2，设定对应交叉工具链的Buildroot配置信息（如下以Mstar平台为例）
| | Target Architecture (ARM (little endian)) ---> | | | | Target Binary Format (ELF) ---> | | | | Target Architecture Variant (cortex-A7) ---> | | | | Target ABI (EABIhf) ---> | | | | Floating point strategy (VFPv2) ---> | | | | ARM instruction set (ARM) --->
注意选择对应平台的信息！！！
2.2 配置Toolchain（这一步很关键，如果错了会直接影响编译）
+--------------------------------------------------------------- Toolchain ----------------------------------------------------------------+ | Arrow keys navigate the menu. <Enter> selects submenus ---> (or empty submenus ----). Highlighted letters are hotkeys. Pressing <Y> |
| selects a feature, while <N> excludes a feature. Press <Esc><Esc> to exit, <?> for Help, </> for Search. Legend: [*] feature is |
| selected [ ] feature is excluded |
| |
| +--------------------------------------------------------------------------------------------------------------------------------------+ |
| | Toolchain type (External toolchain) ---> | |
| | *** Toolchain External Options *** | |
| | Toolchain (Custom toolchain) ---> | |
| | Toolchain origin (Pre-installed toolchain) ---> | |
| | (/opt/arm-buildroot-linux-uclibcgnueabihf-4.9.4/usr) Toolchain path | |
| | (arm-buildroot-linux-uclibcgnueabihf) Toolchain prefix | |
| | External toolchain gcc version (4.9.x) ---> | |
| | External toolchain kernel headers series (3.18.x) ---> | |
| | External toolchain C library (uClibc/uClibc-ng) ---> | |
| | [*] Toolchain has WCHAR support? | |
| | [ ] Toolchain has locale support? | |
| | [*] Toolchain has threads support? | |
| | [*] Toolchain has threads debugging support? | |
| | [*] Toolchain has NPTL threads support? | |
| | [*] Toolchain has SSP support? | |
| | [*] Toolchain has SSP strong support? | |
| | [ ] Toolchain has RPC support? | |
| | [*] Toolchain has C++ support? | |
| | [ ] Toolchain has D support? | |
| | [ ] Toolchain has Fortran support? | |
| | [ ] Toolchain has OpenMP support? | |
| | [ ] Copy gdb server to the Target | |
| | *** Host GDB Options *** | |
| | [*] Build cross gdb for the host | |
| | [ ] TUI support | |
| | [ ] Python support | |
| | [ ] Simulator support
| | GDB debugger Version (gdb 8.2.x) ---> | |
| | *** Toolchain Generic Options *** | |
| | () Extra toolchain libraries to be copied to target | |
| | [*] Enable MMU support | |
| | () Target Optimizations | |
| | () Target linker options | |
| | [ ] Register toolchain within Eclipse Buildroot plug-in | |
|+--------------------------------↓(+)--------------------------------------------------------------------------------------------------+|
+------------------------------------------------------------------------------------------------------------------------------------------+
| <Select> < Exit > < Help > < Save > < Load > |
+------------------------------------------------------------------------------------------------------------------------------------------+
注意：
a， 其中Tool Path和Tool Prefix填自己的信息，之后会让你重新配置gcc version和kernel version，依葫芦画瓢就可以了。
b，如出现Cannot execute cross-compile,请核对再三Target Option信息。（笔者亲身经历：前期无法执行交叉工具链的，配置信息有误）
clone之后，在buildroot目录下，再次执行
makemenuconfig//查找bluez5在哪？Symbol:BR2_PACKAGE_BLUEZ5_UTILS[=y]| |Type:bool| |Prompt:bluez-utils5.x| |Location: | |->Targetpackages| | (6)->Networkingapplications| |Definedatpackage/bluez5_utils/Config.in:1| |Dependson:BR2_USE_WCHAR[=y]&&BR2_TOOLCHAIN_HAS_THREADS[=y]&&BR2_USE_MMU[=y]&&!BR2_STATIC_LIBS[=n]&&BR2_TOOLCHAIN_HEADERS| |Selects:BR2_PACKAGE_DBUS[=y]&&BR2_PACKAGE_LIBGLIB2[=y]| |Selectedby[n]: | |-BR2_PACKAGE_BLUEZ_ALSA[=n]&&!BR2_STATIC_LIBS[=n]&&BR2_TOOLCHAIN_HAS_THREADS_NPTL[=y]&&BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4[= |
| - BR2_PACKAGE_GST1_PLUGINS_BAD_PLUGIN_BLUEZ [=n]&&BR2_PACKAGE_GSTREAMER1[=n]&&BR2_PACKAGE_GST1_PLUGINS_BAD[=n]&&BR2_USE_WCHAR| |-BR2_PACKAGE_KODI_BLUEZ[=n]&&BR2_PACKAGE_KODI[=n]&&BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4[=y]&&BR2_TOOLCHAIN_HAS_SYNC_4[=y]| |-BR2_PACKAGE_CWIID[=n]&&!BR2_STATIC_LIBS[=n]&&BR2_USE_WCHAR[=y]&&BR2_TOOLCHAIN_HAS_THREADS[=y]&&BR2_USE_MMU[=y]&&BR2_T| |-BR2_PACKAGE_USSP_PUSH[=n]&&!BR2_STATIC_LIBS[=n]&&BR2_USE_WCHAR[=y]&&BR2_TOOLCHAIN_HAS_THREADS[=y]&&BR2_USE_MMU[=y]&&B| |-BR2_PACKAGE_SCONESERVER_BLUETOOTH[=n]&&BR2_PACKAGE_SCONESERVER[=n]&&BR2_USE_WCHAR[=y]&&BR2_USE_MMU[=y]&&BR2_TOOLCHAIN_HA| |-BR2_PACKAGE_BLUEZ_UTILS[=n]&&!BR2_SKIP_LEGACY[=n]&&BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4[=y]&&BR2_TOOLCHAIN_HAS_SYNC_4[=y]| | |
选择所需配置：
//当你勾选了bluez-utils5之后，所有的依赖库都会被捆绑在一起。//这里我只用bluez5实现ble slave，故没有选取过多设置，可以按需选取| | [*] bluez-utils 5.x | |
| | [ ] build OBEX support | |
| | [*] build CLI client | |
| | [*] install deprecated tool | |
| | [ ] build experimental obexd plugin | |
| | [ ] build health plugin | |
| | [ ] build midi profile | |
| | [ ] build nfc plugin | |
| | [ ] build sap plugin | |
需要说明的是，buildroot这点做的真的挺傻瓜式操作，一键式捆绑动作。免去了所有麻烦！！！
由于我勾选了rootfs，所以make之后回生成rootfs
>>> Generating filesystem image rootfs.tar
检查一下Output是否有输出bluez的一系列安装包。
root@ubuntu:/home/cheng/buildroot/buildroot# ls output/build/alsa-lib-1.2.1.2host-attr-2.4.48host-libtool-2.4.6host-pkgconf-1.6.1libffi-3.3skeletonalsa-utils-1.2.1host-autoconf-2.69host-libzlib-1.2.11host-python3-3.8.2libglib2-2.62.4skeleton-init-common**bluez5_utils-5.52** host-automake-1.15.1host-lz4-1.9.2host-python3-setuptools-41.4.0libiconv-1.15skeleton-init-sysvbluez-alsa-2.1.0host-dbus-1.12.16host-lzo-2.10host-skeleton libsndfile-1.0.28toolchainbuildroot-config host-dbus-glib-0.110host-m4-1.4.18host-squashfs-4.4libzlib-1.2.11toolchain-externalbuildroot-fs host-expat-2.2.9host-makedevs host-util-linux-2.35.1ncurses-6.1toolchain-external-custombuild-time.log host-fakeroot-1.20.2host-meson-0.53.1host-xz-5.2.4packages-file-list-host.txt zlibbusybox-1.31.1host-gdb-8.2.1host-mkpasswd host-zlib packages-file-list-staging.txtdbus-1.12.16host-gettext host-ncurses-6.1host-zstd-1.4.3packages-file-list.txtdbus-glib-0.110host-gettext-tiny-adaa9c64921e80f2b8dd3610ffb508618b9204f3 host-ninja-1.10.0initscripts pcre-8.43expat-2.2.9host-libffi-3.3host-patchelf-0.9libbsd-0.10.0readline-8.0host-acl-2.2.53host-libglib2-2.62.4host-pcre-8.43libedit-20190324-3.1sbc-1.4
确认OK后，就完成了编译工作！
第六点会给出详细地如何替换自己想要的bluez版本的方式！
如需要strip，可以在build option下勾选上，以达到节省空间的要求。
//对应bin文件：bluetoothd dbus-daemon hciconfig//其中bluetoothd dbus-daemon为bluetooth进程和dbus守护进程，这两部分可以在bluez5_utils-5.52和dbus-1.12.16里面找到。//对应lib：libdbus-1.so.3libexpat.so.1libglib-2.0.so.0libiconv.so.2libintl.so libncursesw.so.6libpcre.so.1libreadline.so.8//这部分已经做了相应的精简，具体到每一个文件都不可以落下//对应dbus配置文件：etc/: bluetooth.conf session.conf system.confusr/share: dbus-1glib-2.0这里是渔！！！root@ubuntu:/home/cheng/buildroot/buildroot# find . -name xxxxx*//所有文件与库也可以在生成的rootfs.tar中找到
注意这些库移植从虚拟机到windows、或者到mnt/share时，需要压缩解压缩，否则会出现符号链接异常等问题。
参照上一点中lib，可对应该文件类的所有库都拷贝到对应工具链。
前述：本次使用的是瑞昱Rtl8723du wifi+ble双模芯片，蓝牙类型：USB
rtl8723du_configrtl8723du_fw
Makefile rtk_bt.crtk_bt.hrtk_bt.o.ur-safertk_coex.crtk_coex.hrtk_coex.o.ur-safertk_misc.crtk_misc.h//直接make即可Makefile Module.symversrtk_bt.hrtk_bt.o.ur-safertk_btusb.mod.crtk_btusb.ortk_coex.hrtk_coex.o.ur-safertk_misc.hmodules.orderrtk_bt.crtk_bt.ortk_btusb.kortk_btusb.mod.ortk_coex.crtk_coex.ortk_misc.crtk_misc.o
对应固件放入lib/firmware 即可。
#!/bin/sh## debug in sd cardinsmod/mnt/sdcard/bluez_bin/rtk_btusb.ko//加载驱动，自载入firmware到rtl8723du中#export LD_LIBRARY_PATH=/mnt/sdcard/bluez_libcp -rf/mnt/sdcard/bluez_lib/var/lib///由于链接了动态库到/var/lib，所以把库都copy到该位置，编译rootfs可把所有都cp -rf bluez_lib/*/lib/mkdir/var/run/dbus//dbus-daemon启动时会动态生成socket file，所以需要在该目录下创建dbus文件夹/mnt/sdcard/bluez_bin/dbus-daemon--system&//启动dbus-daemonsleep 1/mnt/sdcard/bluez_bin/hciconfighci0 up//启动蓝牙sleep 1/mnt/sdcard/bluez_bin/bluetoothd--compat-n &//启动bluetoothdsleep 1/mnt/sdcard/bluez_bin/hciconfighci0 noscan//双模芯片，主动关闭piscansleep 1/mnt/sdcard/bluez_bin/hciconfighci0 name 'TY'//设置名字sleep 1/mnt/sdcard/bluez_bin/hciconfighci0 down sleep 1/mnt/sdcard/bluez_bin/hciconfighci0 up//重启蓝牙sleep 2
//确认分区/mnt/mmcblk0p1# cat /proc/mtd dev:size erasesize namemtd0:0005000000010000"boot"mtd1:0022000000010000"rootfs"mtd2:0020000000010000"kernel"mtd3:001e000000010000"nvrservice"mtd4:004a000000010000"system"mtd5:004a000000010000"backup"mtd6:0005000000010000"mtd"mtd7:0002000000010000"factory"//烧录rootfs/mnt/mmcblk0p1# flashcp rootfs.squashfs.img /dev/mtd1 -v
//查看设备加载是否成功/mnt/mmcblk0p1 # lsmodrtk_btusb394500- Live0xbf920000(O)//查看进程是否运行正常mnt/mmcblk0p1 # ps2847dbus0:01/mnt/sdcard/bluez_bin/dbus-daemon --system2924root0:00./bluez_bin/bluetoothd --compat -n
/mnt/mmcblk0p1 # ./bluez_ble_slave gatt-service unique name: :1.14adddefault_gatt proxyGetPrimary:TrueGetUUID: 1910Exist Includes: 1910GetPrimary:TrueGetUUID: 1920Exist Includes: 1920Registered service: /tuya_service_common_data /tuya_service_bulk_data然后就是手机APP一顿连接.......
/mnt/mmcblk0p1# ./tuya_ble_lib_test gatt-serviceuniquename::1.16adddefault_gattproxyGetPrimary:TrueGetUUID:1910ExistIncludes:1910GetPrimary:TrueGetUUID:1920ExistIncludes:1920Registeredservice:/tuya_service_common_data/tuya_service_bulk_datatuya_bluez_hci_control_piscan:ioctlfailederr=-1piscan(0,0)error,ret:-95GetPrimary:TrueGetUUID:1920ExistIncludes:1920GattServicedontinitGattServicedontinitGetPrimary:TrueGetUUID:1910ExistIncludes:1910GattServicedontinitGattServicedontinitRegisterApplication:OKtuya_ble_advertising_update:adv->len=28,count=0.tuya_ble_advertising_update:scan_resp->len=30//该测试用例下可以直接用lightblue连接，同时相互透传，验证上下行。//同时可在wifiscan时，验证ble连通性
root@ubuntu:/home/cheng/buildroot/buildroot# vi package/bluez5_utils/bluez5_utils.mk//更换版本信息################################################################################## bluez5_utils################################################################################## Keep the version and patchesinsyncwithbluez5_utils-headersBLUEZ5_UTILS_VERSION =5.52//更改此处版本信息BLUEZ5_UTILS_SOURCE = bluez-$(BLUEZ5_UTILS_VERSION).tar.xzBLUEZ5_UTILS_SITE = $(BR2_KERNEL_MIRROR)/linux/bluetoothBLUEZ5_UTILS_INSTALL_STAGING = YESBLUEZ5_UTILS_LICENSE = GPL-2.0+, LGPL-2.1+BLUEZ5_UTILS_LICENSE_FILES = COPYING COPYING.LIB//更新Hash值，该网站下有所有Bluez的版本，切换版本会校验Hash值# From https://www.kernel.org/pub/linux/bluetooth/sha256sums.asc:sha256 f7144ce2039202cfac18ccb52426efea11c98e4f6e1bb8041bcb994b8378560a bluez-5.52.tar.xz
【Issue】：is not allowed to own the service "org.bluez" due to security policies in the configuration file
【Issue】：Failed to start message bus: Could not get UID and GID for username "dbus"
该问题主要是dbus权限问题，以及bluetooth.conf配置信息未加载
权限可添加至/etc/passwd
root@ubuntu:/home/cheng/buildroot/buildroot# cat output/target/etc/passwdroot:x:0:0:root:/root:/bin/shdaemon:x:1:1:daemon:/usr/sbin:/bin/falsedbus:x:1000:1000:DBusmessagebususer:/var/run/dbus:/bin/false
以及，bluetooth.conf
root@ubuntu:/home/cheng/buildroot/buildroot# find . -name bluetooth.conf./output/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/etc/dbus-1/system.d/bluetooth.conf./output/build/bluez5_utils-5.52/src/bluetooth.conf./output/target/etc/dbus-1/system.d/bluetooth.conf./output/target/etc/dbus-1/system.d/bluetooth.conf//拷贝对那个/etc下dbus-1到对应rootfs目录下
【Issue】：Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
该问题是因为执行dbus-daemon时，无法在/var/run下创建dbus/system_bus_socket,故运行Bluetoothd的时候无法连接到该socket file。
可提前在/var/run下mkdir dbus，重新运行dbus-daemon的时候会自动生成该文件，继而可以运行bluetoothd。
【说明】：关于bluetoothd的说明
NAMEbluetoothd - Bluetooth daemonSYNOPSISbluetoothd [--version] | [--help]bluetoothd [--nodetach] [--compat] [--experimental] [--debug=<files>] [--plugin=<plugins>] [--noplugin=<plugins>]DESCRIPTIONThis manual page documents brieflythebluetoothd daemon, which manages alltheBluetooth devices. bluetoothd can also provide anumberofservices viatheD-Bus message bus system.OPTIONS-v,--versionPrint bluetoothdversionandexit.-h,--helpPrint bluetoothd optionsandexit.-n,--nodetachEnable logginginforeground. Directslogoutputtothecontrolling terminalinadditiontosyslog.-f,--configfileSpecifies an explicit configfilepathinstead ofrelyingonthedefault path (/etc/bluetooth/main.conf)fortheconfigfile.-d,--debug=<file1>:<file2>:...Sets how much information bluetoothd sendstothelogdestination (usually syslog's"daemon"facility). Ifthefileoptions are omitted,thendebugging informationfromallthesource files are printed. Iffileoptions are present,thenonly debug printsfromthatsourcefileare printed. The option can be a pattern containing"*"and"?"characters.Example:--debug=src/adapter.c:src/agent.c-p,--plugin=<plugin1>,<plugin2>,..Load these plugins only. The option can be a pattern containing"*"and"?"characters.-P,--noplugin=<plugin1>,<plugin2>,..Never load these plugins. The option can be a pattern containing"*"and"?"characters.-C,--compatProvide deprecated command line interfaces.-E,--experimentalEnable experimental interfaces. Those interfaces arenotguaranteedtobe compatibleorpresentinfuture releases.FILES/etc/bluetooth/main.confLocationoftheglobalconfigurationfile.
