Problems when adding serialport module in Qt project

douglas · 13 Jun 2018, 08:48

@J.Hilk My environment is a bit different; I can't find informations about the version..

J.Hilk · 13 Jun 2018, 09:34

@douglas
from what one can see, it at least seems to be a version of Qt5, for more information press the "Manage kits" button

douglas · 13 Jun 2018, 09:38

@J.Hilk The Manage Kit button shows the settings reported below, in which I can't find any information regarding the Qt version in use:

If from terminal I write

$ qmake --version

I obtain the following:

qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory

Is it relevant the "qt4" shown in that prompt?
Thanks.

J.Hilk · 13 Jun 2018, 10:07

@douglas
well, there we have your problem

you have no QtLibary selected to your kit. Se if you can actually select a QtVersion from that dropdown menu. If you can't than you need to install an actual qt version.

I would recommend the online installer from the Webside.

douglas · 13 Jun 2018, 11:47

@J.Hilk Thanks, I added the version as shown below:

Now, since I should have Qt5, I added the serialport support in my .pro file, but the "unknow module" error still remains. I saw another thing that seems not so clear to me: I run Qt Creator from linux terminal, and when I open my project the terminal shows the following lines, marked in red, in which appears Qt4. Can this be related to the serialport module error?

thank you again.

jsulm · 13 Jun 2018, 11:54

@douglas Above you said you installed Qt 5.6, now you selected Qt 5.7.1
Which Qt version do you really want to use and did you install QtSearialPort for Qt 5.7.1?

douglas · 13 Jun 2018, 12:25

@jsulm when I spoke about Qt 5.6 I was referring to the "About Qt Creator" window shown above. Now I selected Qt 5.7.1 as the version for my kit. But the serialport module isn't recognized yet. What I should do to correctly install QtSerialPort for my actual version?

Pablo J. Rogina · wrote on 13 Jun 2018, 12:25

@douglas could it be possible that you start from scratch with a clean installation of Qt, ideally latest version 5.11? you may try in a virtual machine just in case.

SGaist · wrote on 13 Jun 2018, 13:36

Is it me or are you trying to build your project for an embedded system ?
I see that you are trying to use an arm compiler, did you cross-compile Qt for your device ?

douglas · wrote on 13 Jun 2018, 14:46

@SGaist Yes, my target device runs Linux Yocto. Can this affect the serialport module I am trying to install?

SGaist · 14 Jun 2018, 06:28

Sur it does, you are trying to install the desktop version of the driver and then, use it to do cross-compilation.

douglas · 14 Jun 2018, 06:33

@SGaist I see. So, if I need to cross-compile, which steps should I follow in order to use the serialport in my project?
Are there different libraries or drivers I need to install on my host PC?
The target linux embedded device runs Linux Yocto.

jsulm · 14 Jun 2018, 07:49

@douglas You need Qt (together with Qt Searial Port) cross compiled for your device

douglas · 14 Jun 2018, 07:55

@jsulm I already set up the project in order to cross-compile for my target: in fact, I have already managed to run my application on the target device. The problem is the serial port module: I did not succeeded in including it into my project. Are there any particular hints to follow in the case of cross-compilation?
Thank you!

jsulm · wrote on 14 Jun 2018, 07:55

@douglas Did you cross compile Qt serial port module?

J.Hilk · 14 Jun 2018, 08:51

@douglas
How did you cross-compile for your target device?

I would asume you cloned the qt-sources from git or something similar. However did you crosscompile the whole Framework or only part of it? For any Qt-Program to run you'll need only QtBase, however serialport is a plugin and needs to be compiled seperately.

douglas · 14 Jun 2018, 08:53

@J.Hilk Where can I found the procedure to cross-compile the serial port module?
Thank you.

J.Hilk · 14 Jun 2018, 13:07

@douglas like you did the other modules

git clone git://code.qt.io/qt/<qt-module>.git -b <qt-version>
cd <qt-module>

qmake
make
make install

Pablo J. Rogina · 14 Jun 2018, 14:48

@douglas if you could please show us

How did you cross-compile for your target device?

It may help understanding your issue

douglas · 14 Jun 2018, 18:30

@Pablo-J.-Rogina , after the Qt Creator installation, I followed the indication from 2.1 to 2.7 chapter here:
http://variwiki.com/index.php?title=Yocto_Qt_Creator&release=RELEASE_MORTY_V1.0_DART-6UL#QtCreator_configuration
in which, as far as I see, the environment is configured to cross-compile for my target device.
Now, I am able to create a simple GUI application and run it on my target device, but I can't add the serialport component (in order to manage a RS485 communication) in my project.
Unfortunatelly, I'm a beginner in this matter!
Thanks a lot!