FPGA Many Many Frequency Measurement

[Bladhart]

Hello all,

I am trying to measure the frequency of some 50 PWM signals that only goes up to 300Hz.  I use the R-7833. Attached is what I am using to measure ONE PWM signal.  Now, the problem is: Is there a way to use the same code to measure the 50 PWM signals without copy and pasting the same code 50 times.  Note: I have tried to make them into sub-vi's, but have failed.

 

 

[Spex · Accepted solution]

Hi Bladhart,

This is a good case when moving the I/O node and loop structure outside of the subVI helps make the code more modular and scalable.  NI has posted guidelines for creating FPGA based functions (IP) for reuse.

Here's and example for how you could implement this period measurement VI in a way that is more scalable.

            

SUB-VI                                                                                                                                                  TOP-LEVEL VI

Cheers,

Message Edited by Spex on 11-17-2008 10:47 PM

Message Edited by Spex on 11-17-2008 10:53 PM

Message Edited by Spex on 11-17-2008 10:53 PM

[Bladhart]

Thank you.

That really helped, but I ran into a very strange problem.  I have opened another post for that:

http://forums.ni.com/ni/board/message?board.id=170&thread.id=369502