[PCIe-6363][counter]a pulse width task with sample clock but do more

[65216]

Hi!

 I know the normal pulse width task with sample clock is like this ,which only record the last pulse width before sample clock

Then,a implicit pulse width task record all data but can't synchronize with an external clock

I'd like wto know：can I achieve a task like below:It can record all pulse width, and at the same time,it can divide the data by an external sigal?

[Kevin_Price]

Looking over the threads, I just noticed this long-unanswered one.

I don't *think* you can do that directly with just a pulse width task.

But you probably *could* do it indirectly by setting up a "dummy" task whose purpose is solely as a helper to get you the behavior you want.

I'd probably set up a continuous buffered edge counting task on another counter, and configure it to sample on your designated "Sample Clock" signal.  I'd further configure that helper task to generate a DAQmx Event for "Every N Samples Acquired Into Buffer", designating N=1.

The task you care about should stick with continuous sampling and Implicit timing so it captures every pulse width interval, and it should be started first, before the helper.

In the Event case where you handle "Every N Samples...", perform a DAQmx Read on both tasks, designating "# samples" = -1.  That's a special value that means "read all the samples available right now".  This gets you pretty close to the behavior you illustrated, there's just a little extra latency for Event handling as compared to a hardware sample clock.  (Note: you can ignore the output from the helper task, you're just reading from it to prevent buffer overflow.)

-Kevin P