Acquiring data in LabVIEW FPGA

[dheeraj2102]

Hello,

I am working on LabVIEW FPGA where I have to acquire data from a source and take its average. One way to do that is to keep adding every new signal to the sum f the older ones and then average.

However, I wish to store all the incoming values into a file and save it. But when I tried doing so, it gives an error saying "array size cannot be changed". With this constraint, I am unable to write the data into an array.

Please suggest.

Thank you. 

[GregFreeman · Accepted solution]

You need to acquire data, pass it to the RT, then log there. You cannot use build array on the FPGA because FPGA will not allow for dynamically allocating memory like this. You must preallocate the array then use replace array subset. A better way is to use DMA FIFOs. Have a look at the FPGA examples in LabVIEW for streaming data. Then, on the RT, you can just add in your file logging functions.