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Forum Update on Monday, May 27th 2025

Problems when adding serialport module in Qt project

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  • jsulmJ jsulm

    @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?

    douglasD Offline
    douglasD Offline
    douglas
    wrote on last edited by
    #22

    @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. RoginaP 1 Reply Last reply
    0
    • douglasD douglas

      @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. RoginaP Offline
      Pablo J. RoginaP Offline
      Pablo J. Rogina
      wrote on last edited by
      #23

      @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.

      Upvote the answer(s) that helped you solve the issue
      Use "Topic Tools" button to mark your post as Solved
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      Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

      1 Reply Last reply
      1
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #24

        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 ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        1 Reply Last reply
        4
        • douglasD Offline
          douglasD Offline
          douglas
          wrote on last edited by
          #25

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

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #26

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

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            douglasD 1 Reply Last reply
            2
            • SGaistS SGaist

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

              douglasD Offline
              douglasD Offline
              douglas
              wrote on last edited by
              #27

              @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.

              jsulmJ 1 Reply Last reply
              0
              • douglasD douglas

                @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.

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #28

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

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                douglasD 1 Reply Last reply
                2
                • jsulmJ jsulm

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

                  douglasD Offline
                  douglasD Offline
                  douglas
                  wrote on last edited by
                  #29

                  @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!

                  jsulmJ J.HilkJ 2 Replies Last reply
                  0
                  • douglasD douglas

                    @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!

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #30

                    @douglas Did you cross compile Qt serial port module?

                    https://forum.qt.io/topic/113070/qt-code-of-conduct

                    1 Reply Last reply
                    1
                    • douglasD douglas

                      @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!

                      J.HilkJ Offline
                      J.HilkJ Offline
                      J.Hilk
                      Moderators
                      wrote on last edited by
                      #31

                      @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.


                      Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                      Q: What's that?
                      A: It's blue light.
                      Q: What does it do?
                      A: It turns blue.

                      douglasD 1 Reply Last reply
                      0
                      • J.HilkJ J.Hilk

                        @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.

                        douglasD Offline
                        douglasD Offline
                        douglas
                        wrote on last edited by
                        #32

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

                        J.HilkJ 1 Reply Last reply
                        0
                        • douglasD douglas

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

                          J.HilkJ Offline
                          J.HilkJ Offline
                          J.Hilk
                          Moderators
                          wrote on last edited by
                          #33

                          @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
                          

                          Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                          Q: What's that?
                          A: It's blue light.
                          Q: What does it do?
                          A: It turns blue.

                          Pablo J. RoginaP 1 Reply Last reply
                          1
                          • J.HilkJ J.Hilk

                            @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. RoginaP Offline
                            Pablo J. RoginaP Offline
                            Pablo J. Rogina
                            wrote on last edited by
                            #34

                            @douglas if you could please show us

                            How did you cross-compile for your target device?

                            It may help understanding your issue

                            Upvote the answer(s) that helped you solve the issue
                            Use "Topic Tools" button to mark your post as Solved
                            Add screenshots via postimage.org
                            Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

                            douglasD 1 Reply Last reply
                            1
                            • Pablo J. RoginaP Pablo J. Rogina

                              @douglas if you could please show us

                              How did you cross-compile for your target device?

                              It may help understanding your issue

                              douglasD Offline
                              douglasD Offline
                              douglas
                              wrote on last edited by
                              #35

                              @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!

                              Pablo J. RoginaP 1 Reply Last reply
                              0
                              • douglasD douglas

                                @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!

                                Pablo J. RoginaP Offline
                                Pablo J. RoginaP Offline
                                Pablo J. Rogina
                                wrote on last edited by
                                #36

                                @douglas said in Problems when adding serialport module in Qt project:

                                Now, I am able to create a simple GUI application and run it on my target device

                                Ok, that's a great step. Reading briefly the link you posted to that wiki page, I assume you setup your environment in a Linux PC and using Qt Creator there, you built that simple GUI app that Qt Creator deployed and run in your device.

                                If that's correct, I'd try the following:

                                1. from command line in let's say /home/douglas/projects do
                                cd /home/douglas/projects
                                git clone git://code.qt.io/qt/qtserialport.git -b 5.9
                                cd qtserialport
                                

                                so you should now have a folder /home/douglas/projects/qtserialport will sources for Qt serial port module release 5.9 (the Qt release should match what you have in your dev environment/device, you didn't stated it so far).
                                2. run commands:

                                /opt/fslc-x11/2.2.1/sysroot/x86_64-fslcsdk-linux/usr/bin/qt5/qmake
                                make
                                make install
                                

                                once build and install finishes, you should have the .so shared library and headers into the proper location under your host PC (I couldn't figure out the proper location from the wiki page). But look for something like this (version shuold be the one you cloned...):

                                ./include/QtSerialPort/qtserialportversion.h
                                ./include/QtSerialPort/qserialportinfo.h
                                ./include/QtSerialPort/qserialportglobal.h
                                ./include/QtSerialPort/5.9.0/QtSerialPort/private/qserialport_p.h
                                ./include/QtSerialPort/5.9.0/QtSerialPort/private/qserialportinfo_p.h
                                ./include/QtSerialPort/qserialport.h
                                

                                and

                                ./lib/libQt5SerialPort.so
                                

                                if you succeed here, then you should be able to create a project file (.pro) for your application and add the serial port modulie like this:

                                ...
                                QT += serialport
                                ...
                                

                                and the magic will flow.

                                Upvote the answer(s) that helped you solve the issue
                                Use "Topic Tools" button to mark your post as Solved
                                Add screenshots via postimage.org
                                Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

                                douglasD 1 Reply Last reply
                                2
                                • Pablo J. RoginaP Pablo J. Rogina

                                  @douglas said in Problems when adding serialport module in Qt project:

                                  Now, I am able to create a simple GUI application and run it on my target device

                                  Ok, that's a great step. Reading briefly the link you posted to that wiki page, I assume you setup your environment in a Linux PC and using Qt Creator there, you built that simple GUI app that Qt Creator deployed and run in your device.

                                  If that's correct, I'd try the following:

                                  1. from command line in let's say /home/douglas/projects do
                                  cd /home/douglas/projects
                                  git clone git://code.qt.io/qt/qtserialport.git -b 5.9
                                  cd qtserialport
                                  

                                  so you should now have a folder /home/douglas/projects/qtserialport will sources for Qt serial port module release 5.9 (the Qt release should match what you have in your dev environment/device, you didn't stated it so far).
                                  2. run commands:

                                  /opt/fslc-x11/2.2.1/sysroot/x86_64-fslcsdk-linux/usr/bin/qt5/qmake
                                  make
                                  make install
                                  

                                  once build and install finishes, you should have the .so shared library and headers into the proper location under your host PC (I couldn't figure out the proper location from the wiki page). But look for something like this (version shuold be the one you cloned...):

                                  ./include/QtSerialPort/qtserialportversion.h
                                  ./include/QtSerialPort/qserialportinfo.h
                                  ./include/QtSerialPort/qserialportglobal.h
                                  ./include/QtSerialPort/5.9.0/QtSerialPort/private/qserialport_p.h
                                  ./include/QtSerialPort/5.9.0/QtSerialPort/private/qserialportinfo_p.h
                                  ./include/QtSerialPort/qserialport.h
                                  

                                  and

                                  ./lib/libQt5SerialPort.so
                                  

                                  if you succeed here, then you should be able to create a project file (.pro) for your application and add the serial port modulie like this:

                                  ...
                                  QT += serialport
                                  ...
                                  

                                  and the magic will flow.

                                  douglasD Offline
                                  douglasD Offline
                                  douglas
                                  wrote on last edited by
                                  #37

                                  @Pablo-J.-Rogina Thanks a lot for your post, I'll now begin to put it into practice. I have just one doubt: if I run:

                                  qmake --version
                                  

                                  I obtain:

                                  QMake version 2.01a
                                  Using Qt version 4.8.7 in /usr/lib/x86_64-linux-gnu
                                  

                                  So, if I'm not wrong, the installed version of Qt is the 4.8.7 (quite old). When you stated, in your #1 step, "git clone git://code.qt.io/qt/qtserialport.git -b 5.9" were you assuming my Qt version was 5.9? In other words, the serialport version and the installed qt version should be the same?
                                  If so, how can I upgrade from my actual Qt version to the latest one?
                                  Thanks a lot!

                                  aha_1980A 1 Reply Last reply
                                  0
                                  • douglasD douglas

                                    @Pablo-J.-Rogina Thanks a lot for your post, I'll now begin to put it into practice. I have just one doubt: if I run:

                                    qmake --version
                                    

                                    I obtain:

                                    QMake version 2.01a
                                    Using Qt version 4.8.7 in /usr/lib/x86_64-linux-gnu
                                    

                                    So, if I'm not wrong, the installed version of Qt is the 4.8.7 (quite old). When you stated, in your #1 step, "git clone git://code.qt.io/qt/qtserialport.git -b 5.9" were you assuming my Qt version was 5.9? In other words, the serialport version and the installed qt version should be the same?
                                    If so, how can I upgrade from my actual Qt version to the latest one?
                                    Thanks a lot!

                                    aha_1980A Offline
                                    aha_1980A Offline
                                    aha_1980
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #38

                                    @douglas

                                    you can have multiple Qt versions installed, so please check carefully which one you use.

                                    For the qmakes that are not in PATH, you have to specify the full path, e.g. /opt/Qt/5.9.0/bin/qmake

                                    Regards

                                    Qt has to stay free or it will die.

                                    douglasD 1 Reply Last reply
                                    1
                                    • aha_1980A aha_1980

                                      @douglas

                                      you can have multiple Qt versions installed, so please check carefully which one you use.

                                      For the qmakes that are not in PATH, you have to specify the full path, e.g. /opt/Qt/5.9.0/bin/qmake

                                      Regards

                                      douglasD Offline
                                      douglasD Offline
                                      douglas
                                      wrote on last edited by
                                      #39

                                      @aha_1980 how I can upgrade to the latest Qt version and set it as default in my project? After this I will be sure to use the Qt version 5.9 and I will apply the steps suggested by @Pablo-J-Rogina
                                      Thank you!

                                      aha_1980A 1 Reply Last reply
                                      0
                                      • douglasD douglas

                                        @aha_1980 how I can upgrade to the latest Qt version and set it as default in my project? After this I will be sure to use the Qt version 5.9 and I will apply the steps suggested by @Pablo-J-Rogina
                                        Thank you!

                                        aha_1980A Offline
                                        aha_1980A Offline
                                        aha_1980
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #40

                                        @douglas

                                        First you should find out which Qt versions you have on your computer. Qt 4.8.7 is surely from Ubuntu and is a native Qt - you build programs that run on your computer. What you want, is a cross Qt, to run programs on your embedded device.

                                        As you said you have already done this, you surely have a second Qt version (I cannot tell you which one it is). And this Qt version has a qmake which you need to call to compile Qt programs against this Qt library.

                                        Regards

                                        Qt has to stay free or it will die.

                                        douglasD 1 Reply Last reply
                                        1
                                        • aha_1980A aha_1980

                                          @douglas

                                          First you should find out which Qt versions you have on your computer. Qt 4.8.7 is surely from Ubuntu and is a native Qt - you build programs that run on your computer. What you want, is a cross Qt, to run programs on your embedded device.

                                          As you said you have already done this, you surely have a second Qt version (I cannot tell you which one it is). And this Qt version has a qmake which you need to call to compile Qt programs against this Qt library.

                                          Regards

                                          douglasD Offline
                                          douglasD Offline
                                          douglas
                                          wrote on last edited by
                                          #41

                                          @aha_1980 Thanks. In Qt Creator I set Qt 5.7.1 in the "Qt Version" for the selected kit for my project. Now I can add the serialport module in my .pro file and build the app, but when I try to run it on my target device, the application does not start and the following error appears:

                                          error while loading shared libraries: libQt5SerialPort.so.5: cannot open shared object file: No such file or directory
                                          

                                          Is it related to the serialport module that is not cross compiled or have I to install some dependencies on the target device itself?
                                          Thank you!

                                          aha_1980A 1 Reply Last reply
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