fpga digitizing speed

[Mario46]

Hello All,

thanks in advance for this great forum!!!

my system is a chassis pxi-1042 with a RT controller pxi-8106 and an FPGA 7831-R.

I'm new with LV FPGA and I was trying to create a symple analog input program (I put them in attachments).

the problem is that with signals in the range of 10-20 Hz everything seems to work fine.

If I put in input to the fpga a signal with higher frequency (also only at 50 Hz) the system has strange behaviours, it is like the fpga has a digitizing speed that is not enough.

I set the fpga clock to 40 MHz.

did I miss some settings?

thanks a lot for the support!!

ciao

Mario 

[StevenA]

Mario,

You may want to pass more than one data point at a time with your DMA fifo.  Also, the write to file function you are using is not the best choice for high speed streaming. 

Take a look at this example that Basset Hound put together.