查看“Debian Base 系统使用”的源代码

==基础信息==
*用户密码
<syntaxhighlight lang="bash">
user: root
passwd: root
</syntaxhighlight>
==使用示例==
===视频硬件编解码===
*使用gstreamer播放视频
<syntaxhighlight lang="bash">
$ gst-play-1.0 /usr/local/test.mp4
</syntaxhighlight>
[[文件:277317066.jpg|frameless|650px]]<br />
<br />
*播放4K视频
<syntaxhighlight lang="bash">
$ gst-launch-1.0 playbin uri=file:///root/4k.mp4
</syntaxhighlight>
[[文件:531422585.jpg|frameless|650px]]<br />
<br />
*列出一些gstreamer命令
<syntaxhighlight lang="bash">
$ gst-launch-1.0 playbin uri=file:///usr/local/test.mp4
$ gst-launch-1.0 uridecodebin uri=file:///usr/local/test.mp4 ! kmssink
$ gst-launch-1.0 filesrc location=/usr/local/test.mp4 ! queue ! qtdemux  name=dmux dmux.video_0 ! queue ! h264parse ! mppvideodec ! kmssink dmux.audio_0 ! queue ! aacparse ! faad ! autoaudiosink
$ gst-inspect-1.0 kmssink
  # 查看插件信息
$ gst-discoverer-1.0 /usr/local/test.mp4
  # 查看视频信息
</syntaxhighlight>

===OpenCL===
*安装并运行<code>clinfo</code>，查看OpenCL相关信息
<syntaxhighlight lang="bash">
$ sudo apt-get install -f -y clinfo
$ clinfo
Number of platforms                               1
  Platform Name                                   ARM Platform
  Platform Vendor                                 ARM
  Platform Version                                OpenCL 1.2 v1.r14p0-01rel0-git(a79caef).8ddfd7584149d9238dced4e406610de7
  Platform Profile                                FULL_PROFILE
  Platform Extensions                             cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addy
  Platform Extensions function suffix             ARM

  Platform Name                                   ARM Platform
Number of devices                                 1
  Device Name                                     Mali-T860
  Device Vendor                                   ARM
  Device Vendor ID                                0x8602000
  Device Version                                  OpenCL 1.2 v1.r14p0-01rel0-git(a79caef).8ddfd7584149d9238dced4e406610de7
  Driver Version                                  1.2
  Device OpenCL C Version                         OpenCL C 1.2 v1.r14p0-01rel0-git(a79caef).8ddfd7584149d9238dced4e406610de7
  Device Type                                     GPU
  Device Profile                                  FULL_PROFILE
  Max compute units                               4
  Max clock frequency                             800MHz
  Device Partition                                (core)
    Max number of sub-devices                     0
    Supported partition types                     None
  Max work item dimensions                        3
  Max work item sizes                             256x256x256
  Max work group size                             256
...
</syntaxhighlight>

{{模板:RKDebianNetworkConfiguration}}
{{模板:RKExportPackFirmware}}

==QT开发==
===qt程序测试脚本===
系统中添加了qt_test.sh和qt_test_touchscreen.sh测试脚本，在系统终端下直接运行<br />
<br />
'''基于linuxfb或eglfs显示运行qt程序'''<br />
<syntaxhighlight lang="bash">
$ qt_test.sh linuxfb
$ qt_test.sh eglfs
</syntaxhighlight>
[[文件:1365219484.jpg|frameless|650px]]<br />
<br />
'''基于libinput或tslib或evdev适配触摸屏运行qt程序'''<br />
<syntaxhighlight lang="bash">
$ qt_test_touchscreen.sh libinput
$ qt_test_touchscreen.sh tslib
$ qt_test_touchscreen.sh evdev
</syntaxhighlight>
[[文件:285324002.jpg|frameless|650px]]<br />
<br />
注意：在一次开机系统运行过程中，若使用了DRM，则不可再直接操作FB。在qt_test.sh脚本中启用了QT_QPA_FB_DRM=1，而qt_test_touchscreen.sh脚本为了可能会使用到tslib校准程序没有设置QT_QPA_FB_DRM，一次开机仅可选择其中一个脚本执行<br />
===搭建qt开发环境===
主机PC端环境为Ubuntu16.04，目标板系统为debian base系统，默认使用root用户自动登录，并支持root用户ssh远程登录，系统中移植了qt，支持eglfs、linuxfb显示插件。
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qt环境。解压SDK到任意目录$TOP_DIR（示例中以路径/opt/data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，并配置qt运行环境变量后运行<br />
<syntaxhighlight lang="bash">
$ scp hellowindow root@10.168.1.157:
$ ssh root@10.168.1.157
$ export LD_LIBRARY_PATH=/opt/data/target/usr/lib
$ export QT_QPA_PLATFORM_PLUGIN_PATH=/opt/data/target/usr/lib/qt/plugins
</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|frameless|650px]]<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:Screenshot from 2020-08-11 14-23-21.png|frameless|650px]]<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:Screenshot from 2020-08-11 14-21-33.png|frameless|650px]]<br />
<br />
<br />
'''添加Debuggers（可选项）'''<br />
Tools --> Options --> Build & Run --> Debuggers --> Add --> 选中gdb路径 --> Apply<br />
[[文件:Screenshot from 2020-08-11 14-21-51.png|frameless|650px]]<br />
<br />
<br />
'''添加Devices（可选项）'''<br />
Tools --> Options --> Devices --> Add --> General Linux Device --> start Wizard<br />
GDB Server executable路径为: /opt/data/target/usr/bin/gdbserver<br />
[[文件:Screenshot from 2020-08-11 14-24-23.png|frameless|650px]]<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:Screenshot from 2020-08-11 14-25-12.png|frameless|650px]]<br />
<br />
<br />
'''打开 calculator 工程并选择Kits'''<br />
Welcome --> Open Porject --> 选择工程路径 /opt/data/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples/widgets/widgets/calculator/calculator.pro --> Configure Project<br />
[[文件:Screenshot from 2020-08-11 17-04-50.png|frameless|650px]]<br />
<br />
<br />
'''编译运行 calculator'''<br />
Build --> Build Project "calculator" --> 重启qtcreator<br />
Projects --> debian-kit --> Run<br />
注意：找到 Run Environment --> Details --> Batch Edit 添加QT运行环境变量<br />
[[文件:Screenshot from 2020-08-11 17-13-29.png|1560px|frameless|650px]]<br />
<br />
Build --> Run<br />
[[文件:481762326.jpg|1560px|frameless|650px]]<br />
<br />
<br />
'''配置debug模式'''<br />
Projects --> debian-kit --> Build<br />
注意：找到 Build Steps --> qmake --> Details --> Additional arguments --> 添加 QMAKE_CXXFLAGS+=-g<br />
[[文件:Screenshot from 2020-08-11 17-36-06.png|1560px|frameless|650px]]<br />
<br />
<br />
'''重新编译并调试运行'''<br />
Build --> Clean Project "calculator"<br />
Debug --> Start Debugging --> Start Debugging<br />
[[文件:Screenshot from 2020-08-11 17-33-48.png|1560px|frameless|650px]]<br />
<br />
[[文件:378111369.jpg|1560px|frameless|650px]]<br />
<br />
<br />