Impossible to click on the buttons for the timed loop.

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• Sequence structure flat inside the timed loop and execution order

  I have some problems trying to implement a flat sequence structure when you use a loop timed on a target of cRio VI

  I tried with or without the while loop around the structure of sequence flat, and I also tried to replace the 'Non-deterministic loop' with a timed loop

  The problem is that the program seems to run only once, then get stuck somewhere

  I am writing a program that performs the following operations as soon as possible:
  1. read the Pos_MC of entry on the FPGA
  2 send the value of Pos_MC to the VI target (on cRio CPU)
  3. calculate a value of output based on Pos_MC with a PID block ("exit PID')
  4. send 'PID output' to the FPGA
  5 write "PID output" analog output "MOOG".

  In addition, I want the program to return the measured value "Pos_MC" to a host VI for the recording of data

  So that the output of PID is calculated and sent to the FPGA as quickly as possible, I placed a flat sequence structure to ensure that it happens before you send the output to the nondeterministic loop for recording data

  Also, I want the digital input 'Stop' to be able to stop the loop deterministic (the timed loop)

  I read much more entries than that and the help of several PID and exit, but I rewrote the code for a single entry and exit to make it easier to illustrate

  Screenshot of the code is shown in 'target code.png' and 'fpga code.png.

  The VI themselves are attached in the next post (cannot attach files of more than 3)

  Question 1:
  Any advice on how to get this race? Thank you!

  Question 2:
  Is also my correct understanding in that, using this structure, each 0.9ms (fpga loop time) comes the following:
  1. the input ("Pos_MOOG") is read on the fpga
  2. the production of PID is calculated on the cRio with some delay to computation (for example 0.1ms)
  3. the output of PID is then written for analog output "MOOG" in all about 0, 1 - 0.2ms
  4. the FPGA program then waits until 0.9ms spent and repeat the process

  As opposed to the next pass whenever performing a loop is started on the FPGA:

  1. the FPGA reads the input and written on the output (the output of the execution of the previous loop PID)

  2. then the entry is sent the cRio, PID output is calculated and sent to the FPGA

  3. the new release of PID is maintained until the next time through the loop

  Thank you!

  PHG wrote:

  Thanks for the input guys, any advice as to how I could get the feature in scenario 1?

  I still say that the best route is just putting all the logic of the control in the FPGA.

  Other alternatives include 1) the use of DMA FIFO sedn data back or 2) use interruptions so that the FPGA code can not read the output level until the RT.

  DMA FIFOs are usually very limited, and I would not use them in this situation since I belive said it this code to do for the many outputs.

• While why broken arrow will not appear for a timed loop

  Hi all

  I need a little clarification relative to normal while loop and timed looping in labview.

  In labview, if I keep a while loop on a block diagram, broken arrow will appear in the upper left corner of the window indicating the error. It displays error because I have not wired conditional terminal of the while loop.

  But same is not the case for a timed loop. Can someone tell me what is the reason behind this...

  If I release the conditional terminal of the timed while loop, it runs in infinfite time like a normal while loop. Then y labview behaves differently for these two types of loops in the scenario above.

  FYI... I'm using labview 2009.

  Waiting for response.

  Thank you

  Herald

  Ruben,

  the reason is quite simple: call loops are mostly real-time and FPGA targets. Since most of the applications on these targets work continuously (at least this is more often the task), it is possible to create a loop that does not end. So the timed loop by default assumes that there is no need of a stop button.

  The 'normal' while loop needs code for termination (conditional terminal) because normal applications on Windows/Linux/Mac are used to be fair...

  hope this helps,

  Norbert

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• Why the STOP button stops not timed loop.

  Hello world

  I had a rather complicated code launched against me. I had to change program action unique (and many other things) when ACQUIRING a button has been clicked making timed measurements. I was able to add the time... but I want the loop to stop once you click on the STOP button.

  I have attached a very simplified version of my code.

  So if you start and press the ACQUIRE the program generates random numbers (to simulate the measure) and records them with a device ID. The program stops once the total is for instance in the default settings after 20 sec.

  But it does not stop when you press the STOP button. MY QUESTION: why not?

  FOR INFO:

  In my actual code, there are 10 events instead of only 1.

  It doesn't have to stop immediately, inbetween iterations (because I already tried to include the timed stop Structure VI and it did not work either).

  I also used the execution to highlight, but it did not help me.

  Thank you for any help or suggestion!

  Lisa

  Lisa,

  First of all, thank you for explaining clearly what your problem and to present a simplified program.

  The problem with your program is very simple. The loop inside the structure of the event begins when the acquisition: Mouse Down event occurs, which seems to be what you wanted. The default condition for the case of the event is "front Lock (defer the treatment of the actions of the user) until the end of the occurrence of the event." This is controlled by a checkbox at the bottom of the evetn installation dialog box. What this means is that the stop button is not recognized until AFTER the event is complete.  BUT the case of the event cannot complete until the while loop stops.

  The Solution: Move the loop outside the case of the event.  Generally speaking, event must not contain any code that could take more than a few milliseconds to run and certainly should not depend on the user's other actions to complete.

  Look at the design of producer/consumer models (events) for advice.  Also learn how to use queues to pass data between loops rather than local variables.

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• Execution time of the timed loop

  When I run a timed loop, even a dummy, I have 100% CPU usage with "RT get CPU loads. The Profiler 'Performance and memory' and "execution trace toolkit" also indicate a maximum time of VI. Is this normal?

  What target RT do you use? If it's a FP, you will always have 100% of the CPU load due to the optimizatio performance.

  Best regards

  Fabio

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  On my laptop when I move my arrow of the mouse on the taskbar it shows that something it loads when it is not the case and I can't access anything in the taskbar. Someone knows why?

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  Did you change on your computer before the show?

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