QSerialPort

[SGaist]

Hi,

Is it expected that you read only one line ?
You should rather get everything from the serial port, accumulate in a buffer and then process the data once you have a full frame (or more).

[Tomaz]

@SGaist Hi SGaist. Everytime is good to read your replies. Yes. I control what is being red and it is one line from arduino loop (simple sensor data). Thomas

[SGaist]

Can you share also the thread related code ?

[Tomaz]

@Pl45m4 Hi.
I am sorry but the code is correct on syntax, semantic and semiotic/pragmatic level. The creation of and object has to happen inside the working loop I concluded; (in run loop). I think it has to do with usb port access on low level (QSerialPort c/c++ Qt code). I think. The error is gone now.

I got it from one of SGaist comments/replies.

Perhaps SGaist could give us more enlightenment why it has to be inside run loop (or custom loop like I have)? Perhaps because it is made on heap?

regards, Thomas

[Tomaz]

@Tomaz No it is not the heap problem. Perhaps of the scope object is living in?

[kuzulis]

@Tomaz

Right now everything is wrong in your code.

[Christian Ehrlicher]

Where is readttyUSB0 instantiated / is it moved to a thread somewhere? If yes then you forgot to move sPort (btw: very strange name for a member var) as it has no parent.

[Tomaz]

@Christian-Ehrlicher Hi. Sorry for my late reply. Well it is in mainwindow constructor. This is in constructor.

rttyUSB0->moveToThread(threadttyUSB0);
connect(threadttyUSB0,SIGNAL(started()),rttyUSB0,SLOT(doWork()));
connect(rttyUSB0,SIGNAL(usb0Data(QString)),this,SLOT(readSerialCom(QString)));
threadttyUSB0->start();```

Declared in .h file in private part.

What I do in readSerialCom(QString) is not important.

I let this loop to run for a week with no problem. No compile error. Should be ok.

Thomas

[Tomaz]

@SGaist Hi. SGaist. One question. What is the best way (board?) to boot Linux into Qt graphic App (I need access to /dev- USB) in max 2 to 3 seconds? But to be on open source non commercial side. I tried raspberry Pi and eglfs but it needs 10 seconds. regards Thomas

[Ronel_qtmaster]

@Tomaz if you are using yocto, you can disable certain services at start or change the boot order by prioritising your app

[SGaist]

@Tomaz hi,

It depends on what your device has to do, which services are required, etc.

Based on that you can optimize some things to reduce boot time.