route counter output to port0

[krivan]

Hi,

I am trying to generate a digital square waveform on the P0.0, I use a PXIe-6358. I got to the stage where I can generate the signal at a desired frequency however it appears only on PFI14. Can you please advise how to route it to P0.0 or to any other pins on the Port0? I have seen here some discussions about similar problems but none of them seemed to be suitable for port0.

Thanks,

Krivan

[LV_Pro]

Can you post the applicable LabVIEW code? Or, at the very least if that part of the diagram isn't too complex, an image, preferably in .png format, Not in .bmp.

[krivan]

Hi,

sure, the labview code that generates the pulses with a counter is attached. In this code the pulses are measurable on PFI12 [ctr0] . Can you please suggest how to route this signal to P0.0.

Thanks.

[Brad_K]

Hi krivan,

This diagram from the X Series User Manual shows what signals can be routed to P0.x: X Series Digital I/O Circuitry. Unfortunately, it does not include anything other than DIO signals.

The straightforward solution is to use a PFI line for your counter output. This is how the general-purpose counter/timers on the X Series devices were designed to work. You don't necessarily have to use PFI12. Use the CO.Pulse.Term property to control which PFI line the counter output is connected to:

If you must use port0 for this, it is also possible to generate a square wave using hardware timed DIO instead of general-purpose counter/timers. This example doesn't do exactly what you want but it should be a good starting point: Continuous Write Digital Port - Internal Clock.

Brad

[krivan]

Hi Brad,

thanks for the ideas.

I have already tried the example vi you linked in but this way I haven't got 50% duty cycle pulses. For that reason I used the counters but to use it's output signal I must be able to send the output of the counter to port0. I would certainly use PFI lines but there is a board here that will connect to my PXIe cards and it must get the waveform at a specific point that happens to be the P0.0...

Thanks,

Krivan

[Brad_K]

Hi krivan,

In that example, the "Pattern" control is set to [1, 2, 4, 8, 16, 32, 64, 128]. You need to change it to a pattern that will produce a square wave, such as [0xFFFFFFFF, 0x00000000] (which is actually 32 square waves: one per line).

Brad