Sending data to serial

[StenGay]

I've tried for a few hours now to send a simple message to my Rasberry Pico through COM12 but I can't get it to work.

I'm fairly certain my Pico is set up correctly because when I use Hercules to send data it pick up the data just fine, it's just that I have to set the Mode from "Free" to "Data". on Hercules. Not sure what that means.

Am I sending the data wrongly formatted or what's wrong?

I do get "Data sent successfully" but the Pico is still not receiving it. I do however get the error "QObject::startTimer: Timers can only be used with threads started with QThread" even though I'm not using timers nor threads.

#include <QSerialPort>
#include <QDebug>

int main()
{
    QSerialPort serialPort;

    serialPort.setPortName("COM12");
    serialPort.setBaudRate(QSerialPort::Baud115200);
    serialPort.setDataBits(QSerialPort::Data8);
    serialPort.setParity(QSerialPort::NoParity);
    serialPort.setStopBits(QSerialPort::OneStop);
    serialPort.setFlowControl(QSerialPort::NoFlowControl);

    if (serialPort.open(QIODevice::WriteOnly))
    {
        QByteArray input = QString("addPoints").toLocal8Bit();
        qint64 bytesWritten = serialPort.write(input);

        serialPort.write("test");

        if (bytesWritten == -1)
        {
            qDebug() << "Failed to write to serial port:" << serialPort.errorString();
        }
        else
        {
            qDebug() << "Data sent successfully";
        }

        serialPort.close();
    }

    return 0;
}

[JonB]

@StenGay said in Sending data to serial:

QObject::startTimer: Timers can only be used with threads started with QThread

I wouldn't try this code without declaring a QCoreApplication a() object.
Then I would try a serialPort.waitForBytesWritten() before closing, just in case.

[StenGay]

@JonB I made a console application just to be sure nothing else was preventing it from working.

I've also tried in a Widget application with ;QCoreApplication a() ;declared, I also added serialPort.waitForBytesWritten(); before ; serialPort.close();; but still no data received on the Rasberry. But no QObject::startTimer error so that's something.

[jsulm]

@StenGay said in Sending data to serial:

I made a console application

Also a Qt console application requires https://doc.qt.io/qt-6/qcoreapplication.html

[JonB]

@StenGay
Yes, the Q...Application() is needed for any Qt program. I cannot spot anything wrong in your code. Though I don't know anything about whether the serial port settings are correct or what you would see if they are not. Otherwise I have to question your "but the Pico is still not receiving it". I don't know, is there a tool you can use to monitor sending on a serial port to prove what is going out?

[StenGay]

@JonB hey sorry didnt receive a notification of the reply.

I dont know if my computer was acting up but everytime I ran the build I had to open and close the port with puyty then run the build. then the code worked. very weird.