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：

<syntaxhighlight lang="bash">
qt_test.sh
</syntaxhighlight>
[[文件:1365219484.jpg|frameless|650px]]

基于libinput、tslib或evdev适配触摸屏运行qt程序：

<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]]

===搭建qt开发环境===
主机PC端环境为Ubuntu20.04，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~/trash为例），并运行开发环境配置脚本
<syntaxhighlight lang="bash">
export TOP_DIR=~/trash
mkdir -p ~/trash
tar xpf 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/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples/widgets/widgets/calculator
qmake
make
</syntaxhighlight>

生成calculator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：
<syntaxhighlight lang="bash">
scp calculator 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linuxfb显示插件运行程序：
<syntaxhighlight lang="bash">
./calculator -platform linuxfb
</syntaxhighlight>
[[文件:481762326.jpg|frameless|650px]]

===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。

'''安装qtcreator'''
<syntaxhighlight lang="bash">
sudo apt install qtcreator qtbase5-dev qt5-default qtbase5-examples
</syntaxhighlight>

'''添加Qt Versions'''<br />
Tools --> Options --> Kits --> Qt Versions --> Add --> 选中qmake路径 --> Apply<br />
[[文件:Screenshot_from_2023-02-09_19-26-12.png|frameless|650px]]

'''添加Compilers'''<br />
Tools --> Options --> Kits --> Compilers --> Add --> GCC --> C++ --> 选中g++路径 --> Apply<br />
[[文件:Screenshot_from_2023-02-09_19-35-47.png|frameless|650px]]

'''添加Debuggers'''<br />
Tools --> Options --> Kits --> Debuggers --> Add --> 选中gdb路径 --> Apply<br />
[[文件:Screenshot_from_2023-02-09_19-41-35.png|frameless|650px]]

'''添加Devices'''<br />
Tools --> Options --> Devices --> Add --> General Linux Device --> start Wizard --> 输入设备IP和用户名 --> Next --> Next --> Finish --> 输入root用户密码进行测试 --> Close
[[文件:Screenshot_from_2023-02-09_20-21-38.png|frameless|650px]]<br />
<br />
[[文件:Screenshot_from_2023-02-09_20-23-35.png|frameless|650px]]<br />
<br />
[[文件:Screenshot_from_2023-02-09_20-23-39.png|frameless|650px]]

'''添加Kits'''<br />
Tools --> Options --> Kits --> Add --> 如图示添加各项配置 --> Apply<br />
[[文件:Screenshot_from_2023-02-09_20-29-36.png|frameless|650px]]

'''打开calculator工程并选择Kits'''<br />
Welcome --> Projects --> Open --> 选择工程路径 /home/lin/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples/widgets/widgets/calculator/calculator.pro --> Configure Project<br />
[[文件:Screenshot_from_2023-02-09_19-58-43.png|frameless|650px]]

'''配置设备运行环境变量'''<br />
Projects --> Active Project --> calculator --> Build & Run --> Unnamed --> Run --> Run Environment --> Details --> Batch Edit --> 添加QT程序运行环境变量 --> OK
<syntaxhighlight lang="bash">
export LD_LIBRARY_PATH=/opt/data/target/usr/lib
export QT_QPA_PLATFORM_PLUGIN_PATH=/opt/data/target/usr/lib/qt/plugins
export QT_QPA_PLATFORM=linuxfb
PATH=/opt/data/target/usr/bin
</syntaxhighlight>
[[文件:Screenshot_from_2023-02-09_21-48-17.png|1560px|frameless|650px]]

'''编译运行calculator'''<br />
Projects --> Run --> 输入root用户密码 --> 程序构建后会部署到设备上并运行<br />
[[文件:Screenshot_from_2023-02-09_20-57-10.png|1560px|frameless|650px]]<br />
<br />
[[文件:Screenshot_from_2023-02-09_20-57-15.png|1560px|frameless|650px]]

'''配置debug模式'''<br />
Projects --> Active Project --> calculator --> Build & Run --> Unnamed --> Build --> Build Steps --> qmake --> Details --> qmake build configuration --> 选中Debug --> Additional arguments --> 添加 QMAKE_CXXFLAGS+=-g<br />
[[文件:Screenshot_from_2023-02-09_21-30-06.png|1560px|frameless|650px]]

'''重新编译并调试运行'''<br />
Build --> Clean Project "calculator"<br />
Debug --> Start Debugging --> Start Debugging of startup project<br />
[[文件:Screenshot_from_2023-02-09_21-38-28.png|1560px|frameless|650px]]