DIVELK-AN-002: Using Qt Creator

Info Box Applies to Yocto Applies to Diva

This application note was validated against specific versions of the kit only. It may not work with other versions. Supported versions are listed in the History section.

History

Version	Date	DIVELK version	Notes
4.0.0	April 2018	DIVELK 4.0.0
4.0.1	March 2019	DIVELK 4.0.1

Introduction

This application note details QT Creator setup and configuration in DIVELK MVM

Setting up Qt Creator to build for DIVELK

Qt Creator Installation

To install Qt Creator inside your toolchain launch a terminal emulator and run

dvdk@vagrant-ubuntu-trusty-64:~$ cd diva/

dvdk@vagrant-ubuntu-trusty-64:~/diva$ ./qt-creator-opensource.run

An installation wizard will appear. Click Next to proceed with the installation.

Select Skip.

Select Next.

Select the install directory or click Next.

Select Next.

Click Next again.

And then click Install and complete the installation.

Then Finish to exit the setup wizard.

Automatic configuration

Now it is necessary to add the definition of your board before developing and compiling your applications.

In order to add the device information automatically, DAVE provides a simple setup script.

Manual configuration

If you don't want to use the automatic setup or want to customize the configuration, in this section we detail all the step required.

Linaro Toolchain

You should be able to find the linaro toolchain already inside the virtual machine at ~/diva, if not the following will download and extract the toolchain.

Download the following archive and extract it

mkdir -p /home/dvdk/diva
tar -xvf gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf.tar.xz -C /home/dvdk/diva

Devices

Go to Tools -> Options menu

Select Devices and click Add

Choose the Generic Linux device

Insert the IP address of your device, root as username and leave password empty (this is the default configuration of DIVELK root file systems). Make sure that the device is connected to the network and your virtual machine networking is correctly configured (see this article for more details).

Then click Next.

If everything went ok you should see a dialog like the image below.

And finally, this is how the Devices window should look like.

GCC & Cross Compilation

Next you need to configure the cross compilation tool inside Build & Run -> Compiler.

Click Add -> GCC and add the compiler path.

/home/dvdk/diva/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc

And click Apply.

Do the same for the C++ cross compilation tool.

/home/dvdk/diva/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++

Debugger GDB

Now it is necessary to add a debugger. In order to do this go to the Debuggers tab and click Add

And then select the GDB debugger at the location

home/dvdk/diva/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gdb

and click Apply.

Qt Version

Next you need to add the Qt Version installed on your device. Go to Qt Version click Add and select the following qmake file.

/home/dvdk/diva/sdk/divelk-4.0.0-qt5/sysroots/x86_64-aragosdk-linux/usr/bin/qt5/qmake

Kits

The last step is to add a new kit. Go to Kits and click Add and complete the information as shown below.

Pay attention that in Qt mkspec you need to write

linux-oe-g++

After this your setup is complete and you can proceed and create your Qt applications.

Qt application example

Now that the setup is finished, you can create your first application.

In order to debug your application with QtCreator, it is mandatory to utilize the linaro toolchain Toolchain . Furthermore, if the Weston compositor is active, the debug process is slow. For this reason it is higly recomanded to disable it with

root@diva:~# /etc/init.d/weston stop

Now open a new terminal and source the environment variables with the command.

dvdk@vagrant-ubuntu-trusty-64:~/diva/sdk/divelk-4.0.0-qt5$ source environment-setup

In the same terminal type the following command (we assume you didn't change the default installation directory)

dvdk@vagrant-ubuntu-trusty-64:~$ ./qtcreator-4.5.2/bin/qtcreator

It is important to repeat the previous two step every time you start QTCreator

Now click on New Project

Select Application Qt Widgets Application and click Choose...

Now call the Project Test and press Next.

Select the DIVELK Kit and click Next.

Choose the class name for your application.

Click Finish to conclude the setup.

To add a clickable button to your application, select the Edit window and select Test -> Forms -> mainwindow.ui

Click on Push Button in the Buttons tab and drag it to the main window view. In order to edit the text displayed by the label, double click it and write "Hello World!".

After that, you need to insert the following two lines inside the Test.pro file

target.path = /tmp/Test # path on device

INSTALLS += target

Where /temp/Test is the path in which your application will be downloaded inside the device.

The last step before running the application inside the device is to configure Qt backend into application command line arguments: open the Project window and select the Run configuration, then type -platform eglfs into Arguments

After these changes you are ready to debug your application inside your board with the Run/Debug command