how to read and write in serial port in RHEL platform?
I am writing a simple program :
int main(int argc, char *argv)
QCoreApplication a(argc, argv);
QByteArray output ;
output = "name";
input = serial.readAll();
qDebug() << input;
As I want to display the input but I am not getting any diplayed item.
But whenever I am using the qint64 byteswriiten = serial.write(output), byteswritten is giving the 5 in terminal if we display it.
Kindly help me out as I am stuck here.
I just want to check whether the data which I am writing in serialport is there or not?
and then can I read the same data from the serialport?
Are you sure this is correct?
On linux its normally called
You can test with
It shows which ports it can see.
Actually I am using some other port naming whose address is correct. But still its not working with read and write or may be not working with read only!!!! I don't know whats the matter?????
Well code looks fine - so in what way does it not work?
Can u read anything at all?
Without the actual code you are using , its impossible to give guesses.
@mrjj Except port name I gave you the code which I am running.
There is no output at all in display. Thats why I am confused that evrythin gis correct so where I did any mistake (if any).
Even when I am running any QT example program like CREADERSYNC or any other, still there is no output.
So is there any problem in QT??
As I have used different computers for different versions of Qt and still I am getting the same problem.
I highly doubt it has anything to do with Qt.
Why dont you try minicom or other serial program and see if you can read anything.
yeah I have used other serial programs too but still no answer.
But then it means that your serial is simply not working or
what ever that should answer/send is not doing it.
If its not working with other serial program, it wont work with Qt either.
So you must find out what part is not working.
Does the other end even try to send something?`
Maybe a silly question but: do you have anything connected on that port ? How should it answer ?
There is nothing else connected to that port.
I have mentioned you what I did...
My problem is resolved.
There is some timing mismatch thats all.
You mentioned what you coded not what you had connected to the serial port whether it is another computer or a device. If you did then sorry I didn't saw it.
It's ok if you have not noticed it that I was doing the connection in the same computer which is wrong.