How to use qserialport in multi widget application

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serial-port

QT-Creator

Hello all,

I'm developing a multi-widget Qt desktop application that serially interacts with an embedded device. I'm new to Qt and serial port application development.


I need to reuse the opened serial port instance in other forms as well for reading or writing.

Where and how I can configure the serial port in order to access it in multiple forms without repeating configuration?

for example, if I have to a connection in a second widget, how can I access the serial object??

Any help would be welcome.

What I have tried:

I created the instance in one module (.cpp file) and then export the declaration through a .h file which other modules who need to access it.

Here is the .h of the serial implementation

#ifndef TETRASERIAL_H
#define TETRASERIAL_H

#include <QObject>
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>
#include <QDebug>

class tetraSerial : public QObject
{
    Q_OBJECT
public:
    explicit tetraSerial(QObject *parent = nullptr);
  static QSerialPort *serialObject;

signals:

public slots:
};

#endif // TETRASERIAL_H

The corresponding .cpp file as follows.

I configured the serial port in that class file. I want to call that instance in different windows.

#include "tetraserial.h"

 QSerialPort *tetraSerial::serialObject;


tetraSerial::tetraSerial(QObject *parent) : QObject(parent)
{

   serialObject = new QSerialPort(this);
   serialObject->setPortName("com5");
   serialObject->setBaudRate(1000000);
   serialObject->setDataBits(QSerialPort::Data8);
   serialObject->setParity(QSerialPort::NoParity);
   serialObject->setStopBits(QSerialPort::OneStop);
   serialObject->setFlowControl(QSerialPort::HardwareControl);
   serialObject->open(QIODevice::ReadWrite);

}

I tried to call this using `connect` in the MainWindow as follows.

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtSerialPort/QSerialPort>
#include "tetraserial.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

  connect(tetraSerial::serialObject, SIGNAL(readyRead()),this,SLOT(serialRecived()));

}

I'm getting a runtime error and throws this in the console.

cannot connect <null>::readData() Mainwindow::serialRecived