DAQmxCfgDigEdgeAdvTrig

[elleryjh]

My ultimate goal is to create a stepping function (for example: 0v, 1v, 2v, 3v, 0v, 1v, 2v, 3v, 0v, 1v,...) where the transisition from one voltage to the next is triggered by a digital input signal.

The only way I see to do this is to use the  DAQmxCfgDigEdgeAdvTrig function, but I'm unclear on how to setup the task before using it.

 

DAQmxCfgDigEdgeAdvTrig

  Purpose

    Configures a switch task to advance to the next entry in a scan list on a rising or falling edge of a digital signal.

 

I understand it advances to the next entry, but how do I populate the task with all entries, and is it possible to create a loop of events so that I can create the stepping function I desire?

[GarPar]

Hi elleryjh-

     The DaqmxCfgDigEdgeAdvTrig function is only used for controlling a switch to move through a scan list of configuration settings.  It is not the correct way to move through a set of voltages.

     You might look at this forum post to get some more ideas on staircase/step functions.

     You will probably end up setting up some logic to increase the voltage of an analog output task based on a digital input.

Best of luck with your application!

[GarPar · Accepted solution]

Hi elleryjh-

     I just wrote a piece of sample code in LabVIEW that does exactly what you need it to do.  It might help to see it in LabVIEW then implement it in a text-based environment.

     It can be found here.

Regards,

[elleryjh]

Wow that looks great - thank you so much for your help, Gary!!