FAQs

How to Develop Qt Programs and Display Them via HDMI

The overall process is divided into two steps:

Cross-compile Qt programs

Set up the Qt runtime environment and run the program

Cross-compile

Taking a cross-compilation host with the system as "Ubuntu18.04" as an
example, the steps are as follows:

Obtain Resources

Clone this

git repository

 using git clone.

Create and name a file called "se-build-server.yml" with the following
content:

   version: "3.3"
   services:
       se-build-server:
           image: huangzhenming/se-build-server:V1.0
           container_name: sophon_build 
           privileged: true 
           network_mode: host 
           restart: always 
           volumes:
               - /data/your_working_dir:/workspace 
               - /data/toolchains/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu:/toolchains 
               - /etc/timezone:/etc/timezone:ro 
               - /etc/localtime:/etc/localtime:ro 
           command: ["/bin/ping", "localhost"] 
           user: linaro 
           working_dir: /workspace 
           environment: 
           - "PATH=$PATH:/toolchains/bin"

Download the necessary cross-compilation tools:

gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu

Installation of the "docker" and "docker compose" tools varies from
platform to platform, so please search for the relevant publicly
available information on the Internet to install them, and we will not
describe them here

Run docker (the runtime will automatically download the image from
docker Hub, and the time required depends on the network speed, ensure
a stable internet connection):

   docker-compose -f se-build-server.yml  up -d

After running, it will automatically create "/data/your_working_dir"
and "/data/toolchains/" folders on your system, you can also modify
the "yml" file to create folders in other paths.

Copy and extract the "git" package and the cross-compilation toolchain
to the specified path:

   cp -r path/to/sophon-qt/qt-lib/qtbase-5.14.tgz /data/your_working_dir
   cp -r path/to/sophon-qt/qt-example/SophUI/* /data/your_working_dir
   cd /data/your_working_dir/ && tar xvf qtbase-5.14.tgz
   cp -r path/to/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu.7z /data/toolchains/
   cd /data/toolchains/ && 7z x gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu.7z

Cross-compile (using the SophUI source code as an example):  enter
docker：  docker ps -a  # Get the docker image and container
information. The image name should have `huangzhenming` in it. docker
exec -it  container_id  /bin/bash # enter docker   Perform the
compilation(In docker):  cd  /workspace ./install/bin/qmake SophUI.pro
-spec linux-aarch64-gnu-g++ CONFIG+=qtquickcompiler make

After compilation, the "SophUI" executable is generated, which can be
executed directly on the device.

Run the Qt program

By following the above steps, you can get the executable file "SophUI"
, which can be copied to the 1684 device by means of "scp".

Before running, you need to write a script to set the environment
variables as follows:

   #!/bin/sh
   export QTDIR=/usr/lib/aarch64-linux-gnu 
   export QT_QPA_FONTDIR=$QTDIR/fonts 
   export QT_QPA_PLATFORM_PLUGIN_PATH=$QTDIR/qt5/plugins/
   export LD_LIBRARY_PATH=/system/lib:$LD_LIBRARY_PATH
   export QT_QPA_PLATFORM=linuxfb:fb=/dev/fl2000-0 
   export QWS_MOUSE_PROTO=/dev/input/event3
   ./SophUI 

After that, give the script permission to run, and execute it with the
HDMI monitor plugged in.

Note that if the 1684 is running on a Debian system, you will need to
import the Qt libraries and other files separately, otherwise you will
get an error, which is not the case with Ubuntu systems

.

Import it from the PC via "scp" and execute it on the 1684 device:

   scp PC@IP:/path/to/qtbase-5.14/lib/* /usr/lib/aarch64-linux-gnu/ 
   mkdir -p /usr/lib/aarch64-linux-gnu/qt5
   scp  PC@IP:/path/to/qtbase-5.14/plugins/ /usr/lib/aarch64-linux-gnu/qt5/

If the Qt program also contains fonts, you also need to

download

 the font files here, and then copy them to the "/usr/lib/aarch64
-linux-gnu/font" directory on the 1684 device. For example:
"/usr/lib/aarch64-linux-gnu/fonts/wqy-microhei.ttc".

IP configuration of the ethernet interface

The shell is marked with "1", which is close to the network port of
the RS232/RS485 interface, corresponding to the system eth0 network
interface, set to DHCP mode.

The shell is marked with "2", which is close to the Ethernet port of
the HDMI interface, corresponding to the system eth1 network
interface, set to static address mode: 192.168.150.1/24.

What is the default username and password of the system?

Username: linaro

Password: linaro

Switch superuser: sudo -s

What should I do if the startup is abnormal and the cycle restarts?

It may be that the power supply current is not enough, please use a
power supply with a voltage of 12V and a current of more than 5A.