FPGA parallel While loops

[juanfer23]

Hello,

I´m using a NI 9870 module in my Crio system, and the program was working correctly.

The problem I have is because I also need to use a Profinet PN module, and when i try to use both of the programs included in my FPGA, my 9870 module doesnt work as it´s supposed (it´s writting points....instead of the characters).

Can anybody help me with this? is it supposed that the different While loops are working independent and without any problem, is this right?
or should I implement the program in a different way?

I would appreciate any idea or input,

Thanks so much for your help!!

[R.Kaszubiak]

Hi,

In fact, While parallel loops are working independent and without any problem normally.

I don't understand all parts of your code but I think :

- make sure taht cycle time of the while loops must be diferent of 0 to avoid the while loop takes all the CPU.

It can causes anormal behaviour.

- your Memory use is dangerous because of in diferent loops, you can write values at the same time in your memory.

So be careful at your memory adresses where you write in your while loops.

If your diferent loops write at the same memory adress you can have strange values.

Best Regards.

R. Kaszubiak

[crossrulz]

The thing that I'm curious about is if you are using the same memory addresses for the two different functions.  I can't tell since the front panel isn't shown.  So my guess is that your data is being overwritten by the new loop.

EDIT:  Nevermind.  I see now that they are different memory sections.

[juanfer23 · Accepted solution]

Thanks everybody for the answers.
I´ve already solved the problem, and it was in the size of the Read FIFO.

I am using only one FIFO for reading, and for this, i include a number after the data, depending which port i´m using. When the size of the data in the FIFO is not exactly the same as in the FPGA program, this function is working not correctly, and returns false data.

After changing this, the program was working correctly.
thanks anyway again for your time!!!