dma with ni6602

[Julio Lidón]

Hi all,

I'm trying to figure out whether I can do the following with the NI6602. I haven't programmed yet for this device.

I want to:

Configure 2 channels as counters of TTL pulses.

I want to use a gate (external or generated inside the NI6602) to count during these gate periods (can be down to us) the TTL pulses on those channels.

I want to have the values of the different gated periods saved in memory (dma). No more than 1000 gate periods

I would like to use Linux and no Labview.

Maybe it's too general, but I couldn't find any example of how to do this kind of DMA with the NI6602.

Thanks in any case.

[sendia]

I think you can do all of these with any counter card, but you will have to must use the driver NI-DAQmx for your Linux Distribution (DAQmx Base has less functionalities). To configure DMM transfer mode, follow this instructions (you can find equivalent of these LabVIEW functions/properties in the C API)

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019O65SAE&l=en-US

DAQmx for Linux install the C API. In the readme.txt you can read...

"Q: How do I use the C API for NI-DAQmx on Linux?

A: You will need the C API header file and shared library. A symbolic link for

   the C API header file is located using the following path:

      /usr/local/include/NIDAQmx.h

   A symbolic link for the C API shared library is located using the following

   path:

      /usr/local/lib/libnidaqmx.so"