Qextserial on debian linux and readyRead slot

[kuzulis]

Seems, you missed setup a port name, like:

SerialPortReader::SerialPortReader(...)
{
...
 
m_serialPort = new QSerialPort();
 
m_serialPort->setPortName("/dev/ttyUSB0"); // << :)
 
if (!m_serialPort->open(QIODevice::ReadWrite))
    return;
...
}

SerialPortReader::SerialPortReader(...)
{
...

m_serialPort = new QSerialPort();

m_serialPort->setPortName("/dev/ttyUSB0"); // << :)
 
if (!m_serialPort->open(QIODevice::ReadWrite))
    return;
...
}

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UPD:

Is it true I need to use connect before I open the port? In terminal example does this.

Yes, you can... Has no difference do it before or after than open(). But if you do QObject::connect() after open(), don't forget after close() to call QObject::disconnect().

I tried to this, and in open I get an error: "No such file or direcory". I tried /dev/ttyUSB0 and ttyUSB0 too.

It because maybe really a port is not present.

Could I debug into QtSerial?

Yes, of course.

[zamek42]

hi,

Seems, you missed setup a port name, like:

Yes thx, it was a little mistake, I already found it...

It because maybe really a port is not present.

No, the port continuously works, cutecom, gtkterm and qtserialport example terminal can use it and works well. There is a hw, which always sends 80 bytes of frames at every 5 ms.
I used to check with lsof /dev/ttyUSB0 to opened locks. I am the member of dialout groups.

What do I need to set for debugging into source of qtserialport?
When I debug my program, I see the address of serialport, but I can't see the variables and I cannot step into a function.

thx
Zamek

[kuzulis]

What do I need to set for debugging into source of qtserialport?

Build *.so library as "debug" target... Or directly connect the sources via "serialport-lib.pri" file (imho, *.pri - it is preffered and simple to do gebugging).

[zamek42]

Hi Kuzulis,

I found the problem. I wrote this test inside an infinite loop, so the main thread couldn't runs and there was no emitted event on received char.
It was good lesson for me: the main thread cannot blocked!

Many thx to you

Zamek