Data acquistion using single-cycle timed loop in labview fpga (7833R target)

[Benvalet]

Hi All,

I want to acquire analog input data from a funtion generator using single cycle timed loop  and DMA FIFO. I want to use the acquired data to act as process variable for my PID control. Can the code attached perform the purpose? I am sceptical about its functionality. Any advice or suggestions please.

Kind Regards,

Opuk

[natasftw]

Anything outside of the SCTL won't update while the SCTL runs.  You'll pass the same value each time.

[crossrulz · Accepted solution]

The SCTL is not doing anything for you here.  Just remove it and write directly from your analog read to the DMA Write.

And on the Host side, you should move the Run method to before the loop.

You should also consider doing the PID inside of the FPGA.  PIDs work the best in a deterministic environment, and you can't get any more deterministic than on an FPGA.

[Benvalet]

Thanks alot natasftw for the response

[Benvalet]

Thanks crossrulz for the prompt response. I removed the SCTL from the fpga and removed the Run method out of the loop as suggested and it works. Thanks