Qt Serial Port
Download QT Serial Port Driver for free. QT driver class that supports serial port access on windows and linux / posix compliant systems. This system take advantage of QT's event driven archtecture. And also because Serial com is full duplex, it should be possible to read and write at the same time. Nobody forbids to do it to you in non-blocking (async) approach. Download QT Serial Port Driver for free. QT driver class that supports serial port access on windows and linux / posix compliant systems. This system take advantage of QT's event driven archtecture.
I am creating a script in QT for reading the format packages (AA), (BB), etc from serial port. I open the serial port, but when I go to check inside the QByteArray values, comes back that I could not read any value.
This is my code
1 Answer
You called readAll() immediately after open(). It probably took the computer a few nanoseconds to get from one to the other.
At 9600 baud, each byte of data takes slightly more than one millisecond to transfer. It would be absolutely impossible for any data to have arrived in that short an interval, so that's why you got no data.
Serial ports don't begin buffering incoming data until you open them (how could they, what baud rate and other settings would be used for receiving and buffering when no program has the port open?)
Qt Serial Port
Use either a blocking read function of some sort (such as readLine()) or an event loop that reacts to data when it arrives.
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Ben VoigtBen Voigt
Qt Serial Port Programming
I'm able to connect to my serial port, but I need to read data from it all the time.
It's working for about 39 minutes, but after it stops at line serial.flush().
When I stop Qt and start it again it also stops at serial.flush(). I need to restart my modem to let it work again..
I'm not sure I'm executing this properly..
//EDIT
if deleting flush it's working, but code goes really fast. It don't wait for WaitFor..
After 2nd loop he doesn't has time to read data.
serial.isOpen() && serial.isWritable() always sends true in while loop.
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Program stops at flush after 30 minutes!
1 Answer
If serial.isOpen() && serial.isWritable() is true in while loop, but you can't access it could come from you preferences on your computer.
On OSX: System preferences -> network -> select serial -> advanced -> PPP:
able: Ask to stay connected every 10 minutes,
disable: disconnect at close of session,
disable: disconnect when changing of user