GUI is unresponsive upon receipt of data

I am relatively new to Labview and still getting used to the model data flow programming. I'm using LV as a control panel for some software and hardware running on an FPGA for a prototype I've created. Communication with the FPGA is made using the UART and seems to work correctly. I have however the problem as my command buttons unresponsive in certain special occasions. I think that the best way to go here, it is that I explain what must do my program (and what I think he should do), post my VI, explain when it blocks and I hope someone can help me to identify the problem.

As I said LV is supposed to be the Control Panel, via this Panel the user can change some settings and start/stop the measurement. Orders should be sent to the FPGA (ZYBO Board for those interested) which applies the commands and sends return measures.

I founded my VI on the simple state machine model and build the rest from there. I tried not to use too variable, as I read that this breaks the flow of data model, but sometimes I could not find another way.

It is thus the VI should work: after initialization, it should be waiting for the event status, pending a change in the value of the start/stop button or the button exit. Every second, a timeout event occurs and LV checks with the FPGA (and sends the commands to the FPGA). If the Start button is pressed the FPGA starts to measure in each packet, it returns the FPGA will tell how tall are there are still and send the data 60bytes to LV most of the time the UART communication is the bottleneck and the number of measures will begin to grow. During this time, however, I am still able to change the values of the controls I have send to the FPGA (I like). If I press the start/stop button once again I send the command stop to the FPGA, which means that it will stop measuring, but always send data to LV I think VI makes a loop on the same States when it measures (communication-> button control-> manage data-> communication). Meanwhile however the GUI does not appear to meet my keys, it won't let me change the commands I send or even use the exit button. This lack of response remains while I get data. Once the number of remaining measures hits 0 (the variable 'name' in VI) goes back to the State "in anticipation of the event" and at that time there my previous keys are executed. (So let's say that I pressed the convenient stop button are still some measures should be sent, if only the moment where I press the exit button it will not respond but once the communication has been completed, it will record key press exit and exit the VI.)

I tried to avoid working with timers since communication is the bottleneck for the moment, this is the reason why I will not return to the State "wait event" once the measures began.

I hope my explanation is clear, that otherwise, I'm happy to clarify even more (or reword if necessary). A summary of my problem:

During the time that I am able, and receive data I have to loop through the same States that when I stopped position and am simply receive data ("communication-> button-> handle control') data-> communication. When I am able the GUI is always sensitive and when I stopped measuring it is not. I hope that someone can help me to find the problem and we hope to offer you a solution.

Thanks in advance!

PS as I said that I am relatively new to programming LV so if you see some other "nono" you can also tell me to improve myself.

It is the nature of the beast when it comes to State Machines. This is why if you perform operations of a lot of time, you will need a parallel loop in order to accept user input. Look in the architecture of messages in queue manager that comes with LabVIEW. It is essentially a structure of the event in a loop that sends messages to another loop through a queue. The loop (slave) receiver is on these messages and takes as long as he wants without interrupting the user input.

In other news, it seems that you used the simple state machine good enough popularize and how to configure reports and other things. Here are a few tips none-the-less:

  • You don't need the structure of the sequence. Your code already follows the stream, so you don't need to create separate data sections. It compartmentalizes the code and ultimately get rid of the ability of LabVIEW to perform some of these operations in parallel to increase the speed of execution. Structured sequence should be used when you do not have a way to control the operation order (by adding a wait between two operations, etc.).
  • You can move the control command structure of the event and manage changes in value through a shift register. There is overhead associated with reading the control every single loop.
  • Once you look into the QMH architecture, you will be able to get rid of all the Boolean reading of output you have in each case. The structure of the event should contain all your controls to optimize the functionality of input from the user.
  • You have the cluster of error through each case because the model put there for you, but you do not use. You should the dishes your clusters of error through so that you know if you made a mistake somewhere. Your initialization and Comm States should have it wired for sure to see if you have a series being undermined.

Tags: NI Software

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