查看“Imx-4.1.15 Yocto-2.1 系统使用”的源代码

该yocto系统是基于x11显示协议的嵌入式系统。系统集成的qt支持x11显示插件。

==基础信息==
===用户密码===
系统默认使用root用户登录，并支持root用户ssh远程登录，给目标系统root用户设置密码为root<br />
<syntaxhighlight lang="bash">
$ passwd root
> root
> root
</syntaxhighlight>

==QT开发==
===搭建qt开发环境===
x86主机或虚拟机的系统用Ubuntu16.0或Ubuntu18.04进行交叉编译开发，开发环境配置参考如下：<br />
Ubuntu16.04系统主机编译环境建议安装
<syntaxhighlight lang="bash">
sudo apt-get install repo git-core gitk git-gui gcc-arm-linux-gnueabihf u-boot-tools device-tree-compiler gcc-aarch64-linux-gnu mtools parted libudev-dev libusb-1.0-0-dev python-linaro-image-tools linaro-image-tools autoconf autotools-dev libsigsegv2 m4 intltool libdrm-dev curl sed make binutils build-essential gcc g++ bash patch gzip bzip2 perl tar cpio python unzip rsync file bc wget libncurses5 libqt4-dev libglib2.0-dev libgtk2.0-dev libglade2-dev cvs git mercurial rsync openssh-client subversion asciidoc w3m dblatex graphviz python-matplotlib libc6:i386 libssl-dev texinfo liblz4-tool genext2fs expect patchelf gawk
</syntaxhighlight>
Ubuntu18.04系统主机编译环境建议安装
<syntaxhighlight lang="bash">
sudo apt-get install asciidoc autoconf autotools-dev bash bc binfmt-support binutils bison build-essential bzip2 chrpath cmake cpio curl cvs dblatex device-tree-compiler diffstat expect fakeroot file flex g++ gawk gcc genext2fs git git-gui gitk g++-multilib graphviz gzip intltool libdrm-dev libglade2-dev libglib2.0-dev libgtk2.0-dev liblz4-tool libncurses5 libqt4-dev libsigsegv2 libssl-dev libudev-dev libusb-1.0-0-dev linaro-image-tools live-build m4 make mercurial mtools ncurses-dev openssh-client parted patch patchelf perl python python-linaro-image-tools python-matplotlib python-pip qemu-user-static repo rsync sed ssh subversion tar texinfo u-boot-tools unzip w3m wget libdb1-compat python3-pyelftools
</syntaxhighlight>
主机PC端环境以Ubuntu16.04为例，目标板系统为buildroot嵌入式系统，默认使用root用户登录，并支持root用户ssh远程登录，给目标系统root用户配置密码为root<br />
<syntaxhighlight lang="bash">
$ passwd root
> root
> root
</syntaxhighlight>
SDK与系统镜像一同发布，从相应的烧录包中获取SDK。SDK中包含交叉编译工具链、qmake、与目标板系统的rootfs。解压SDK到任意目录$TOP_DIR（示例中以路径/home/lin/trash为例），并运行开发环境配置脚本<br />
<syntaxhighlight lang="bash">
$ tar host.tar.gz -C $TOP_DIR
$ cd $TOP_DIR/host
$ ./relocate-sdk.sh
</syntaxhighlight>
===使用终端命令行编译运行qt程序===
qt程序使用SDK中的qt5 examples例程，通过qmake、make命令进行编译
<syntaxhighlight lang="bash">
$ export PATH=$TOP_DIR/host/bin:$PATH
$ cd $TOP_DIR/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples/opengl/hellowindow
$ qmake
$ make
</syntaxhighlight>
生成hellowindow程序，可通过scp拷贝到目标板中直接运行<br />
<syntaxhighlight lang="bash">
$ scp hellowindow root@10.168.1.247:
$ ssh root@10.168.1.247
$ ./hellowindow
</syntaxhighlight>
系统在/etc/init.d/S50launcher开机启动服务中，启动了wayland显示服务，并运行了QLauncher桌面，若使用eglfs或linuxfb显示插件，则需要移除S50launcher服务
<syntaxhighlight lang="bash">
$ mv /etc/init.d/S50launcher ~
$ sync
$ reboot
</syntaxhighlight>
指定eglfs显示插件运行程序<br />
<syntaxhighlight lang="bash">
$ ./hellowindow -platform eglfs
</syntaxhighlight>
[[文件:Projects 0.jpg|800px]]<br />
<br />
指定linuxfb显示插件运行程序<br />
<syntaxhighlight lang="bash">
$ ./calculator -platform linuxfb
</syntaxhighlight>
===使用qtcreator开发调试qt程序===
qtcreator集成编辑、编译、运行、调试环境于一体，提升开发效率<br />
<br />
'''安装qtcreator'''<br />
<syntaxhighlight lang="bash">
$ sudo apt-get install qtcreator
</syntaxhighlight>
<br />
'''添加Qt Versions'''<br />
Tools --> Options --> Build & Run --> Qt Versions --> Add --> 选中qmake路径 --> Apply<br />
[[文件:Qtcreator1 Qt Versions.png]]<br />
<br />
<br />
'''添加Compilers'''<br />
Tools --> Options --> Build & Run --> Compilers --> Add --> GCC -- 选中g++路径 --> Apply<br />
注意：选中g++路径，并修改ABI一栏明确指示平台架构为arm<br />
[[文件:Qtcreator1 Compilers.png]]<br />
<br />
<br />
'''添加Devices（可选项）'''<br />
Tools --> Options --> Devices --> Add --> General Linux Device --> start Wizard<br />
[[文件:Qtcreator1 Devices.png]]<br />
<br />
并点击"Test"测试设备联通'''<br />
[[文件:Device Test.png]]<br />
<br />
<br />
'''添加Kits'''<br />
Tools --> Options --> Build & Run --> Kits --> Add --> Apply<br />
[[文件:Qtcreator1 Kits.png]]<br />
<br />
<br />
'''打开 hellowindow 工程并选择Kits'''<br />
Welcome --> Open Porject --> 选择工程路径 /home/lin/trash/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples/opengl/hellowindow/hellowindow.pro --> Configure Project<br />
[[文件:Qtcreator1 Configure Project.png]]<br />
<br />
<br />
'''编译运行 hellowindow'''<br />
Build --> Build Project "hellowindow" --> 重启qtcreator --> Build --> Run<br />
[[文件:Projects 1.png|1560px]]<br />
<br />
[[文件:Projects 2.jpg|1560px]]<br />
<br />
<br />