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USB Communication Using Qt

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  • A Offline
    A Offline
    andre
    wrote on last edited by
    #16

    [quote author="koahnig" date="1303984402"]
    [quote author="Andre" date="1303983404"]Could you not use QExtSerialPort to simply list the available ports, instead of guessing their names?[/quote]

    Not that I am aware off. Probably, you have to do it brute force by checking all com ports.

    [/quote]

    There is an enumerator in the source code: http://qextserialport.cvs.sourceforge.net/viewvc/qextserialport/qextserialport/

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    • K Offline
      K Offline
      koahnig
      wrote on last edited by
      #17

      [quote author="Andre" date="1303985184"]
      There is an enumerator in the source code: http://qextserialport.cvs.sourceforge.net/viewvc/qextserialport/qextserialport/
      [/quote]

      you mean the enum on NamingConvention ?
      I did not come across this yet. But it is nowherelse referenced. So it could be dead source.

      Vote the answer(s) that helped you to solve your issue(s)

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      • Z Offline
        Z Offline
        ZapB
        wrote on last edited by
        #18

        No, there is a device enumeration function in qextserialport that probes what serial devices you have available.

        Nokia Certified Qt Specialist
        Interested in hearing about Qt related work

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        • A Offline
          A Offline
          andre
          wrote on last edited by
          #19

          I mean this class: http://qextserialport.cvs.sourceforge.net/viewvc/qextserialport/qextserialport/qextserialenumerator.h?revision=1.3&view=markup

          Sure, old code, and not in the docs, but the code is there...

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          • Z Offline
            Z Offline
            ZapB
            wrote on last edited by
            #20

            BTW the sourceforge project is no longer active. The new home is "here":http://code.google.com/p/qextserialport/

            Nokia Certified Qt Specialist
            Interested in hearing about Qt related work

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            • K Offline
              K Offline
              koahnig
              wrote on last edited by
              #21

              Got it!
              Thanks again. Will try to use it. Apperently, it was not part of the example I have come across.

              Vote the answer(s) that helped you to solve your issue(s)

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              • C Offline
                C Offline
                Candiman
                wrote on last edited by
                #22

                @Koahnig, if I don't come right with libusb I can fall back on serial to USB as you suggested. Tnx for the link to qextserport.
                @ZapB, tnx for the info serial to USB converter chip. If required I will modify my hardware and go the serial route.
                I will post here again on completion of the project with info on how to do it for others that might find it useful.

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                • Z Offline
                  Z Offline
                  ZapB
                  wrote on last edited by
                  #23

                  OK. For info, the QStateMachine framework can be very handy for controlling hardware devices so it may be worth a look in you case. Good luck with your project.

                  Nokia Certified Qt Specialist
                  Interested in hearing about Qt related work

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                  • K Offline
                    K Offline
                    koahnig
                    wrote on last edited by
                    #24

                    @Candiman Thx for feedback. Good to know that it helped. Good luck with your project. Please make sure to post a link in this thread. I am interested to see the outcome.
                    @ZapB Thx for updated link. Wasn't aware of this. There seem to be a couple of derivatives of the source floating around. Actually I started out with one, but some things required reversal. So it is good to know where the original source code is. Have fun.

                    Vote the answer(s) that helped you to solve your issue(s)

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                    • AlicemirrorA Offline
                      AlicemirrorA Offline
                      Alicemirror
                      wrote on last edited by
                      #25

                      @all

                      Hi, I have found this thread because I have a similar problem.

                      I have to communicate with a serial external device folowing a simple yet precise protocol. I have tried a fast test to develop the protocol using RXTCComm java library that works not so good and now I was searching for a Qt approach that is the final goal of the other side of the device.

                      I try to put all your advices together and see if a working stuff can be done. If it maybe useful I put the project on the project area so who is interested can follow. As the project is ready and setup it will be on projects.forum.nokia.com/mill-machine I will announce it on t the forum appropriate area and in the Qt embedded group.

                      Cheers.

                      Anticipating many thanks to all.

                      Enrico Miglino (aka Alicemirror)
                      Balearic Dynamics
                      Islas Baleares, Ibiza (Spain)
                      www.balearicdynamics.com

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                      • C Offline
                        C Offline
                        Candiman
                        wrote on last edited by
                        #26

                        Great. Tnx Alicemirror.

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                        • D Offline
                          D Offline
                          dan_geo
                          wrote on last edited by
                          #27

                          Hi. I have used rs232 communication in visual c++ 6.0
                          which work very well. But because of my problem with
                          transmit images trough socket in VC++ which is
                          too complicated than Qt implementation ( very simple ).
                          I need to implement rs232 comunication.
                          My interface have to use TCP socket for internet comunication and rs232 for comunicate with microcontroller
                          and electrical devices.

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                          • C Offline
                            C Offline
                            Candiman
                            wrote on last edited by
                            #28

                            Hi dan_geo, let me know if you get your RS232 comms working with Qt. I have had to shift focus to a different project but during the downtime over the December holidays and from Jan 2012 I will be putting effort into the USB via Qt project again since many of my projects can benefit from having a GUI that I can design with Qt. I decided not to go with the RS232 option because so many PCs these days don't have a serial port. USB to serial converters are cheap, but if I can communicate directly with my device using USB then I don't need any additional hardware / drivers etc.
                            Good luck!

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                            • D Offline
                              D Offline
                              dan_geo
                              wrote on last edited by
                              #29

                              I have not get rs232 comm. Next days i will try to
                              implement them in Qt. If you are a source, please
                              sent to me. About usb, this task i will do later
                              with PIC18F4455. At usb i understand that
                              for make a host usb is more complicated than
                              implement a usb client for example a controller.

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                              • D Offline
                                D Offline
                                dcbasso
                                wrote on last edited by
                                #30

                                What its the best to access USB port:

                                http://doc.qt.nokia.com/qtextended4.4/qserialport.html

                                http://code.google.com/p/qextserialport/

                                http://qt-apps.org/content/show.php/QSerialDevice?content=112039 (Updated)

                                Thanks.

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                                • K Offline
                                  K Offline
                                  koahnig
                                  wrote on last edited by
                                  #31

                                  According to "this post":http://qt-project.org/forums/viewthread/15580/#90074 there is a wiki on "QtSerialPort":http://qt-project.org/wiki/QtSerialPort Apparently, the source is inherited from QSerialDevice.

                                  Vote the answer(s) that helped you to solve your issue(s)

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                                  • D Offline
                                    D Offline
                                    dcbasso
                                    wrote on last edited by
                                    #32

                                    It's possible to use the QtSerialPort on QT4? On this page (see: http://qt-project.org/wiki/Building-Qt-5-from-Git#15e7b6ad3df43ff719f8388ab4afb1cc) show thats is possible but he only explains to build in qt5!

                                    Anyone is using on QT4? The example there show only to build on Windows, not on linux...

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                                    • D Offline
                                      D Offline
                                      dcbasso
                                      wrote on last edited by
                                      #33

                                      Well, I compile using QT Creator 4.8.1, now I copy the compile folder "QtAddOnSerialPort" to directory:

                                      "../bin/QtSDK/Desktop/Qt/4.8.1/gcc/include/."

                                      This will be enough to work with SerialPort/USB on QT?

                                      Thanks all!

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                                      • K Offline
                                        K Offline
                                        kuzulis
                                        Qt Champions 2020
                                        wrote on last edited by
                                        #34

                                        Possible.

                                        Build and install process:

                                        
                                        bq. $mkdir serialport-build
                                        $cd  serialport-build
                                        $qmake ../qtserialport/serialport.pro
                                        $make (or nmake)
                                        $make install (or nmake install)
                                        
                                        Note: But in Windows, this build and install only the Debug version. To build and install Release version - just repeat the steps again, with:
                                        
                                        bq. $qmake ../qtserialport/serialport.pro CONFIG+=release
                                        
                                        
                                        use:
                                        ~~~
                                        
                                        your custom *.pro file:
                                        
                                        bq. CONFIG += serialport
                                        
                                        your *.cpp file:
                                        
                                        @#include <QtAddOnSerialPort/serialport.h>
                                        #include <QtAddOnSerialPort/serialportinfo.h>
                                         
                                        QT_USE_NAMESPACE_SERIALPORT@
                                        
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                                        • D Offline
                                          D Offline
                                          dcbasso
                                          wrote on last edited by
                                          #35

                                          hi kuzulis, from QtCreator I build and appears to works fine... Doing the make as you said give me an error...
                                          I have already copy and past the folder "QtAddOnSerialPorta" to “../bin/QtSDK/Desktop/Qt/4.8.1/gcc/include/.” and QtCreator find the includes:

                                          @
                                          #include <QtAddOnSerialPort/serialport.h>
                                          #include <QtAddOnSerialPort/serialportinfo.h
                                          @

                                          I'm trying to run the example on that page but doesn't works.... the errors:

                                          "Undefined reference to 'QtAddOn::SerialPort::SerialPortInfo::avaliablePorts()'"
                                          ... (more others 14 similar erros)

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