Can DAQmxRegisterEveryNSamplesEvent function be used for the Counter Input Channels

[slowsheep]

But if I can reference both lines like (e.g. "Dev1/port0/line0:1"). I can't tell the edge changing is from line 0 or line 1.

Regards,

Yang

[John_P1]

That's true, to tell which edge has changed you would have to read the value of the lines back (you can only have one DI change detection task on a device).

You need to clarify your application, I don't think you should be using change detection anyway.

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@slowsheep wrote:

My concerned is that if the callback function can be executed on time on each rising edge of pulse, especially when the system is busy.

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This is a valid concern... there are no guarantees when it comes to software-timed execution.

Best Regards,

[slowsheep]

Thanks for your immediate reply.

I didn't notice that I can only have one DI change detection task on a device. Because my application has two indepedent external signal inputs for the NI card. They are from sensors on the left side and on the right side.

If there is only one DI change detection task for a device, I will try DAQmxCfgSampClkTiming and DAQmxSetCICountEdgesTerm function to see if I can get good result. Thanks

Regards,

Yang