Does anyone know how to use a gate signal to control succesive iterations of a while loop?

[RJH-student]

I am using the same concept of measuring a single period as implemented in the Measure_Period.vi of Ni-DAQ v.6.1, however in my own .vi I have made modifications so that I am able to measure successive periods and store these values in an array. I know that the functionality of the .vi that I am creating is very similar to the Measure_Buffered_Period.vi found in the Labview library, however I am not able to use that .vi due to the nature of my project. The periods that I am measuring are not consistent, therefore I need to figure out how I can make the subsequent iteration of a while loop wait for the next signal on the gate pin. I am thinking that I may be abl
e to use the CTR_Control.vi or some other advanced .vi to do this. I am relatively new to Labview, so I am not very familiar with using the advanced .vi's to control a loop. Any ideas on how I might be to accomplish this will be greatly appreciated. Thank You, Joe

p.s. - I have my signal to be measured hooked up to the gate, and the source is an internal timebase of 20Mhz

[markwysong]

I have tried to implement the EXACT same code. If you are using an E series board, as I suspect you are, the logical way would be with an interrupt or occurrence. Unfortunately, there's no way to do that directly with an E series board. You could set up a triggered analog input, and have it set an occurrence.

If you're not familiar with an occurrence, it's like an interrupt. You can make code "wait" until an occurrence is set, and it doesn't take any processor time.

The other way (and untimately the way I went) is just to let your loop run relatively fast, and check the counter value every time. Once you get a real value, that's the one you add to your array.

Hope that helps.

Mark