Help getting started: externally triggering a 7841R FPGA

[Mawx]

Hi,

  I'm a relatively inexperienced LabVIEW user with no experience with FPGAs.  I'm looking to produce a simple FPGA VI as a first use of our 7841R.  We synchronize multiple devices with a pulse generator and would also like to use the pulse generator to trigger our 7841R.  I haven't been able to find a simple example of how to do this*.  Here's what I think I've figured out so far:

(1) create a while loop

(2) add an FPGA I/O node for one of the digital input nodes (say, DI0) (or maybe this should be an I/O method?)

(3) ...this is where it gets hazy....presumably the I/O node produces some output that I can then use to trigger an event

(4) once triggered, change the voltage level on one of the analog output nodes

Any help would be appreciated -- especially pointing me toward relevant tutorials or examples.

Thanks!

Cheers,

tom

* I did work through a tutorial that has the FPGA output a sine wave and that worked great....but I've been stumped after a few hours of searching about to figure out the triggering.

[ThiCop · Accepted solution]

Hello Tom,

Here's a first tutorial you can go through:

http://zone.ni.com/devzone/cda/tut/p/id/3261 

This tutorial does it the other way around (triggering something by an analog edge):

https://www.ni.com/en/support/documentation/supplemental/21/designing-custom-triggering-applications...

This one is the most handy one according to me (also about custom analog triggering):

http://zone.ni.com/devzone/cda/tut/p/id/6359 

It shows how you can trigger a digital output based on analog input value.

In your case you'll just have to do it the other way around:

Read in a digital value and then based on that write something to an analog output.

If these tutorials don't help you along enough, then don't hesitate to give us a sign.

[Mawx]

Thanks for the help, Thierry!  I've got some external triggering working already :).

[ThiCop]

Great to hear that!

If any questions/issues pop up, then don't hesitate to let us know.