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    Qt World Summit: Early-Bird Tickets

    Unsolved Multi serial port application

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    • V
      veera last edited by A Former User

      Hi All,
      Please find my gui Application for 3 serial ports read,write and log ,I want know that how should i start in qt creator I am passing the parameters from the GUI for opening serial port,can you please help me out for how should i receive the parameters from gui.0_1512369536285_multi.png

      jsulm aha_1980 2 Replies Last reply Reply Quote 0
      • jsulm
        jsulm Lifetime Qt Champion @veera last edited by

        @veera Could you please be more specific? I don't understand what you are asking.

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

        1 Reply Last reply Reply Quote 3
        • aha_1980
          aha_1980 Lifetime Qt Champion @veera last edited by

          @veera: I hope you didn't create three panels and want to write code three times.

          Better create one panel as a reusable widget with the full logic inside and then instantiate this widget as ofte as you need.

          Qt has to stay free or it will die.

          1 Reply Last reply Reply Quote 4
          • V
            veera last edited by veera

            @jsulm ,
            In gui part i had created UI as a Dialog window in this window i need to connect three serial ports i am using qcombobox for taking serialportInfo as a

            foreach (const QSerialPortInfo &serialPortInfo, QSerialPortInfo::availablePorts())
                    {
            
                       ui->Port_comboBox->addItem(serialPortInfo.portName());
                    }
            
                foreach (const QSerialPortInfo &serialPortInfo2, QSerialPortInfo::availablePorts())
                    {
            
                       ui->Port2_comboBox->addItem(serialPortInfo2.portName());
                    }
            
                foreach (const QSerialPortInfo &serialPortInfo3, QSerialPortInfo::availablePorts())
                    {
            
                       ui->Port3_comboBox->addItem(serialPortInfo3.portName());
                    }
            int count_ports = QSerialPortInfo::availablePorts().count();
            

            with this serial count i am using to check port and serial attributes from gui after validating all assigning each port with qthread and qtimer for reading and writing data .....response window is plaintextwindow....how to start please guide me ........thanks for the valuabl response....

            jsulm 1 Reply Last reply Reply Quote 0
            • V
              veera last edited by

              @aha_1980
              I need to connect 3 serial ports at time so i need all the 3 ports on my gui dialog window...

              1 Reply Last reply Reply Quote 0
              • jsulm
                jsulm Lifetime Qt Champion @veera last edited by

                @veera Are you sure you need threads and timers? Qt serial port implementation is asynchronous.

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

                1 Reply Last reply Reply Quote 2
                • V
                  veera last edited by

                  @jsulm
                  yes i have to do it in qthreads and qtimer for managing three serial ports for application ,,,,,i don't know exactly you guide me in right manner ...

                  aha_1980 1 Reply Last reply Reply Quote 0
                  • aha_1980
                    aha_1980 Lifetime Qt Champion @veera last edited by

                    @veera

                    You didn't understand me. I said, with your task you can create one object containing the logic and the UI to talk to a serial device. There may be small differences between the devices, but I'm sure this can be configured. Once you have this object working (you can test it alone with one or all devices), you instantiate three instances of this object and let them run together.

                    I don't know if you need threads, that's up to you. I guess you will need not and threads usually complicate things a lot, so I would avoid it.

                    Regarding the UI <-> QSerialPort coupling: Have you already looked at and understand the Terminal example? [1]

                    Regards

                    [1] http://doc.qt.io/qt-5/qtserialport-terminal-example.html

                    Qt has to stay free or it will die.

                    1 Reply Last reply Reply Quote 3
                    • V
                      veera last edited by

                      @aha_1980
                      okay thanks for the valuable reply i am sharing the code here for collecting all the parameters from gui storing into my structure for opening the serial ports .and how to set the mark and space parity ,i have to use the termios structure ?

                      void Dialog::on_set_pushButton_clicked()
                      {

                      QString Setbutton = ui->set_pushButton->text();
                      if (Setbutton == "setPort1" )
                      {
                          QString port1 = ui->port_comboBox->currentText();
                          QString serPort1 = "ttyS4";
                      
                          DevSettings.port_name = port1;
                          QString dev_name = "/dev/";
                          QString dev_port = dev_name + port1;
                          //qDebug () << "dev_port name is " << dev_port;
                          DevSettings.port_name = dev_port;
                          qDebug() << "DevSettings.port_name " << DevSettings.port_name;
                          QString p1_speed = ui->speed_comboBox->currentText();
                          QString p1_start = ui->start_comboBox->currentText();
                          QString p1_stop = ui->stop_comboBox->currentText();
                          QString p1_parity = ui->parity_comboBox->currentText();
                          QString p1_data = ui->data_comboBox->currentText();
                          QString p1_hwflow = ui->hwflow_comboBox->currentText();
                          QString p1_swflow = ui->swflow_comboBox->currentText();
                          bool p1_log   = ui->log_checkBox->checkState();
                          QString p1_interval = ui->Interval_comboBox->currentText();
                      
                      
                          DevSettings.baudRate = p1_speed;
                          DevSettings.startbit = p1_start.toInt();
                          DevSettings.parity = p1_parity;
                          DevSettings.StopBits = p1_stop;
                          DevSettings.hwflowControl = p1_hwflow;
                          DevSettings.swflowControl = p1_swflow;
                          DevSettings.dataBits = p1_data;
                          DevSettings.logfileEnabled =p1_log;
                          DevSettings.SerialPort_Interval = p1_interval;
                          qDebug() << DevSettings.baudRate << DevSettings.startbit << DevSettings.parity << DevSettings.StopBits << DevSettings.hwflowControl <<  DevSettings.swflowControl <<  DevSettings.dataBits <<  DevSettings.logfileEnabled << DevSettings.SerialPort_Interval;
                      
                          }
                      

                      }

                      aha_1980 1 Reply Last reply Reply Quote 0
                      • V
                        veera last edited by

                        here is my structure in dialog.h

                        enum portWindow
                        {
                        WINDOW_1
                        ,WINDOW_2
                        ,WINDOW_3
                        };

                            struct Settings {
                                FILE *fd;
                                QString port_name;
                                QString baudRate;
                                QString dataBits;
                                qint64 startbit;
                                QString parity;
                                QString StopBits;
                                QString hwflowControl;
                                QString swflowControl;
                                bool logfileEnabled;
                                QString SerialPort_Interval;
                                enum portWindow serialPortWindow;
                            };
                        
                            Settings DevSettings;
                        

                        and project files are

                        SOURCES +=
                        main.cpp
                        dialog.cpp
                        serialappparams.cpp

                        HEADERS +=
                        dialog.h
                        serialappparams.h

                        FORMS +=
                        dialog.ui

                        1 Reply Last reply Reply Quote 0
                        • aha_1980
                          aha_1980 Lifetime Qt Champion @veera last edited by

                          @veera said in multi serial port application:

                          okay thanks for the valuable reply i am sharing the code here for collecting all the parameters from gui storing into my structure for opening the serial ports .

                          I'm not sure if you need to store the data separately: you have it in the UI and you set them in the QSerialPort object. IMHO there's no need to cache them again... There is some caching in the Terminal example, but mostly because the data is transported from the settings dialog to the main window.

                          and how to set the mark and space parity ,i have to use the termios structure ?

                          With http://doc.qt.io/qt-5/qserialport.html#parity-prop ?

                          Qt has to stay free or it will die.

                          1 Reply Last reply Reply Quote 0
                          • V
                            veera last edited by

                            @aha_1980
                            How would you know the which port is sending the port information ,how i need to handle this problem????

                            aha_1980 1 Reply Last reply Reply Quote 0
                            • aha_1980
                              aha_1980 Lifetime Qt Champion @veera last edited by

                              @veera said in multi serial port application:

                              @aha_1980
                              How would you know the which port is sending the port information ,how i need to handle this problem????

                              Sorry, but I don't understand your question.

                              As said, I would start creating ONE object (maybe a QPanel) configuring ONE serial port, sending data to ONE serial port and receiving data from ONE serial port. If you have this working, it's easy to have three of them so you can communicate with all serial ports.

                              Qt has to stay free or it will die.

                              1 Reply Last reply Reply Quote 0
                              • V
                                veera last edited by

                                Hi @aha_1980 ,
                                I am working for single port now ,its not able to open the port here is my code by using send pushbutton and connect()

                                void Dialog :: open_serialport()
                                {
                                QSerialPort serial;
                                QString portName = ui->port_comboBox->currentText();
                                qDebug() << "The portName is " << portName;
                                bool currentPortNameChanged = false;
                                QString currentPortName;
                                if(currentPortName != portName)
                                {
                                currentPortName = portName;
                                currentPortNameChanged = true;
                                }

                                if(currentPortName.isEmpty())
                                {
                                    qDebug() << "No port name specified";
                                }
                                
                                if(currentPortNameChanged)
                                {
                                    serial.close();
                                    serial.setPortName(portName);
                                    qDebug() << "portName" << portName;
                                
                                    if(!serial.open(QIODevice::ReadWrite))
                                    {
                                        qDebug() << "can not able to open the serial port";
                                    }
                                }
                                

                                }
                                its giving error i am passing from gui ,please help me out....

                                1 Reply Last reply Reply Quote 0
                                • mrjj
                                  mrjj Lifetime Qt Champion last edited by

                                  @veera said in multi serial port application:

                                  void Dialog :: open_serialport()
                                  {
                                  QSerialPort serial; <<<< WRONG ! its local variable

                                  make it a class member of Dialog

                                  1 Reply Last reply Reply Quote 3
                                  • V
                                    veera last edited by

                                    @mrjj ,
                                    just now declared a QSerialPort as data members of the dialog class in dialog.h still also i am getting same error...

                                    here is the declaration of the QSerialPort

                                    #ifndef DIALOG_H
                                    #define DIALOG_H

                                    #include <QDialog>
                                    #include <stdio.h>
                                    #include <QtSerialPort/QSerialPort>
                                    
                                    
                                    namespace Ui {
                                    class Dialog;
                                    }
                                    
                                    class Dialog : public QDialog
                                    {
                                        Q_OBJECT
                                    
                                    public:
                                        QSerialPort serial;
                                    
                                    1 Reply Last reply Reply Quote 0
                                    • mrjj
                                      mrjj Lifetime Qt Champion last edited by

                                      Super
                                      but what error ?

                                      1 Reply Last reply Reply Quote 0
                                      • V
                                        veera last edited by

                                        can not able to open the serial port..what was the type its receiving whether its ttyS4 or /dev/ttyS4?

                                        1 Reply Last reply Reply Quote 0
                                        • V
                                          veera last edited by

                                          @mrjj ,
                                          I am directly assigning the portname from gui qcombox is it correct way for accessing the port name ?

                                          1 Reply Last reply Reply Quote 0
                                          • mrjj
                                            mrjj Lifetime Qt Champion last edited by

                                            Hi
                                            normally its ttyS4
                                            for
                                            serial->setPortName(p.name);

                                            Did you see the sample
                                            http://doc.qt.io/qt-5/qtserialport-terminal-example.html

                                            Its available directly in Creator and you can use to test.

                                            1 Reply Last reply Reply Quote 0
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