VI Fails to send queue elements

[belopsky]

I am trying to use a queue to send data from my pulse train subVI to my main VI.

After my pulse train completes, I send a TRUE boolean via the 'Enqueue element' which goes to the 'Obtain Queue' and then to the Dequeue Element to acquire and log data.

I am not sure why the data is only sent the first time, and not consequentially.

I've tried the same with the Notifier to no awail. I am not sure if this is an issue in my SubVI or my main VI.

I am not sure if this is correct? Do I need to release the reference or something?

Thanks!

[belopsky]

here is the pulse train. I would have figured that if I have this in the 'Cycle' message case, if I call it again, which it does successfully, I would be sending another TRUE boolean to my main VI, but it doesnt..

[crossrulz]

Your Dequeue Element is only ran once.  That needs to be in a loop.

[belopsky]

Thanks - I tried that in a while loop, also tried probing the queue prior to it - would this probe list all of the elements queue up?

If so, the additional elements never enter the queue....

[crossrulz]

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@belopsky wrote:

Thanks - I tried that in a while loop, also tried probing the queue prior to it - would this probe list all of the elements queue up?

If so, the additional elements never enter the queue....

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Probing the queue reference will not show the elements in the queue.

If you are sure you are not getting more elements in your queue, then it is a problem with your producer loop.  Are you sure that loop isn't waiting for a message in order to do something that would then add an element to your queue?

[belopsky]

I am sure it's not waiting for a message.

I created a message case solely to test the enqueue element function, probed the message queue, and see that the subVI is going through the various message cases.

How do I debug whether or not elements are being added to the queue?

Thank you

[crossrulz]

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belopsky wrote:

How do I debug whether or not elements are being added to the queue?

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Breakpoints at the Enqueue Element is the simple way since the code will stop when it hits a breakpoint.  If it keeps stopping at the breakpoint, then you should be adding more elements to the queue.  Also make sure there are no errors happening.

[billko]

I hope this is just a gutted VI?  Because if you usually code with sequence structures and no dataflow with error wires, then I can't even guess what might be your problem.