Sequential work with the port

[high_flyer]

because if my request does not reach board for some reason, she will not answer me, no matter how much time I wait. For this reason, I make repeated requests after the timeout.

or you can set a timeout as well.

[maratk1n]

or you can set a timeout as well.

So, how can I do this?..

[high_flyer]

So, how can I do this?..

there are several ways...
Probably the least "intrusive" would be to have a timer run and you can check the elapsed time in your while() loop where you are checking the available bytes from the serial device.
Once the timeout is reached you simply return from your custom waitForReadRead() with false.

[maratk1n]

there are several ways...
Probably the least "intrusive" would be to have a timer run and you can check the elapsed time in your while() loop where you are checking the available bytes from the serial device.
Once the timeout is reached you simply return from your custom waitForReadRead() with false.

Thank for you answer. But I already tried to do this way, the port "was silent".
http://www.qtcentre.org/threads/6904...574#post301574

[high_flyer]

Thank for you answer. But I already tried to do this way, the port "was silent".

Do you mean by that the the port didn't answer within the time you specified?
If yes, then try prolonging the timeout.

[maratk1n]

Do you mean by that the the port didn't answer within the time you specified?
If yes, then try prolonging the timeout.

I tried to increase. Ping using the function waitForReadRead() was 2-5 milliseconds. With the use of a timer, the board absolutely did not answer anything for 333 milliseconds and more. I concluded that data reception is somehow blocked.