Receive Data QserialPort

manel.sam

Hello,

I'm trying to recieve data from a GPS; here is my code below., but i receive anything

I don't know where the problem lies

Thank you.

serialPort = new QSerialPort(devPath,this);
serialPort->setBaudRate(115200);
serialPort->setDataBits(QSerialPort::Data8);
serialPort->setParity(QSerialPort::NoParity);
serialPort->setStopBits(QSerialPort::OneStop);
serialPort->setFlowControl(QSerialPort::NoFlowControl);
if (!serialPort->open(QIODevice::ReadWrite))
{
    log_warning("sensors","failed to open device file \"%s\", GPS measures will be unavailable",qPrintable(serialPort->portName()));
    return;
}

QObject::connect(this->serialPort,SIGNAL(readyRead()),this,SLOT(readUbxNavPos()));
QObject::connect(serialPort, &::QSerialPort::errorOccurred,this,&Gps::handleError);
pollingTimer->start(200);

}
void Gps::handleError(QSerialPort::SerialPortError error)
{
if (error == QSerialPort::ResourceError){
qDebug()<<"Handle Error"<<error;
serialPort->close();
}
}
void Gps::readUbxNavPos()
{
rcvData.append(serialPort->readAll());
qDebug()<<"DataGps"<<rcvData;
}

jsulm

@manel-sam said in Receive Data QserialPort:

void Gps::handleError(QSerialPort::SerialPortError error)
{
if (error == QSerialPort::ResourceError){
qDebug()<<"Handle Error"<<error;
serialPort->close();
}

Do you get any other error here?

Also, why do you use the old connect style for readyRead()?

manel.sam

@jsulm
Thanks for your feedback,

No, I don't have any errors displayed.
So, Could you please give me the new style of Redyread

JonB

@manel-sam said in Receive Data QserialPort:

So, Could you please give me the new style of Redyread

One of many references is https://wiki.qt.io/New_Signal_Slot_Syntax
The "new" style is already ten-odd years old, it's really time all these examples on the web with old style got removed/updated, but I guess it's never going to happen... :(

QObject::connect(serialPort, &::QSerialPort::errorOccurred,this,&Gps::handleError);

So either you do know about "new style", or you have added this to your code. I am surprised this line as-is compiles OK, but maybe it does.

No, I don't have any errors displayed.

@jsulm asked you "Do you get any other error here?", because your code as shown would not display anything other than a ResourceError, so how would you know?

manel.sam

@JonB @jsulm I used the new style of Single , Slot and I checked if the port is yesvert and it is but I still receive nothing and no error is displayed

jsulm

@manel-sam said in Receive Data QserialPort:

and no error is displayed

You're only checking for one of possible errors here:

void Gps::handleError(QSerialPort::SerialPortError error)
{
    if (error == QSerialPort::ResourceError){
        qDebug()<<"Handle Error"<<error;
        serialPort->close();
    }
}

That's why I asked whether you get any other errors. Can you change it to:

void Gps::handleError(QSerialPort::SerialPortError error)
{
    qDebug() << "Error occured" << error;
    if (error == QSerialPort::ResourceError){
        qDebug()<<"Handle Error"<<error;
        serialPort->close();
    }
}

?

manel.sam

it is done, and there is no change.

mrjj

@manel-sam
Can it be you need to send it something for the GPS to reply ?

JonB

@manel-sam
Like @mrjj has said, I wonder whether you are actually being sent anything at all over the serial port. It looks like you are not...

manel.sam

@JonB @mrjj

It's coming back to me. I once had the same problem with an IMU sensor that I could not solve under windows.

But once under linux with the same code, I receive the data perfectly.

Same thing, I just tested under linux for the GPS, I receive the data but not under Windows.

To this day I don't know where the problem comes from