FIFO and Assembly of data

Well I need some advice on what you guys think, would be the best way to assemble my data that I recover from a cRIO FPGA. Let me describe my setup and I am trying to accomplish.

I have a 360 County encoder and a pressure transducer, I collect position and pressure together (this is attached to a motor so my values for the encoder will be 0 to 719) because the pressure-to-position is very important for all calculations, I'll do. I used this tutorial to develop my diagram FPGA and RT. Here's my FPGA:

And here's how I'm currently following the release of FIFO in my RT:

Here is how I used for the treatment of these data before using the FIFO:

(Sorry for the broken lines, I pulled this section before taking a screenshot)

The old method is quite simple:

  1. Synchronization with TDC (crank Angle 0 degrees, (CAD))
  2. Insert values to the table until you reach 719 CAD
  3. Repeat for the desired number of cycles (number of Cycles to acquire)

Now there are a number of problems with what I know, the most important being:

  1. He could miss CAD 719 and wrap around back
  2. Communication of FPGA-to-RT can be too slow and I finished due to lack of CAD (that I can see - there are points where data are missing, and I initialized the array to use the value 100, so I can choose them because regular values are between - 1.5 v and 0, 5V)

Now, I want to accomplish this same thing with the FIFO but don't know how. I need to acquire 720 samples on a line beginning with 0 CAD (so I know that all analog samples are from the same cycle). Any ideas?

Thank you!

Logan


Tags: NI Software

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