Real-Time Synchronization dose not pause, please help

Hi everyone!

I have a problem using the 'Real-Time Synchronization' block. My model is paused at certain times but the 'Real-Time Synchronization' does not seem to be paused too. I noticed this because when I resume the model, the model seem to run a lot faster to catch with the missed ticks(the lag during pause period).

What I really want is for the model to resume at exactly where it was when it was paused and continue to run at the original rate without attempting to catch up with the missed time during the pause period. How can I achieve this?

I just hope that I have made myself clear enough.

Thanks alot Bethel

Answer 1

[Jan Houska]

What you are trying to do is somewhat against the purpose of real-time synchronization. If you have your model connected to a real-world device, you can stop your model with the Pause button but this will (of course) not stop the real-world device time. Strange things may then happen when you continue the simulation because the state of the real-world device will probably not match what your model expects.

That said, it is possible to pause the real-time clock when the model pauses if you know what you are doing. In your model, go to File, Model Properties, Callbacks. As the PauseFcn callback, use

stop(getfield(RT.Kernel, 'Timers'));

and as the ContinueFcn callback, use

start(getfield(RT.Kernel, 'Timers'));

Please be warned that these functions are not documented and may be changed in a future release.

[bethel o]

Thank you very much for the answere Jan. I am using a block (call it block1) that reads frames from an EEG amplifier. This block connects to an unbuffer block to unbufer the frame data. Because of what you said, do you think when I resume the model that the block1 will read delayed(due to the paused period) data? Or will block1 fill up the unbuffer block with delayed data instead of realtime EEG? Because what I want is for the data from the EEG amplifier during the pause period to be ignored by block1(since this block is paused with the model) and when I resume the model, for the block1 to read realtime data from the EEG box.

Thanks Bethel

[bethel o]

@ Jan

I have just tested my setup, everything has worked fine: Thank you very much for the code. You can forget about my second question above.

Thanks

Bethel

[bethel o]

Ok, after more critical testing, I found that it did not work. The external EEG box gave random time delayed output.