Reading binary Dump using the DMA (Direct Memory Access)
Hi all
We are trying to measure short-term frequency using the SR620 (frequency meter) via a GPIB-USB connector. We are trying to understand how to work the controls GPIB, and it seems that you normally send a query and then ask him to read what says the instrument. However, as we try to make a measure of frequency stability in the short term, we use the binary Dump command (BDMP - explained in the manual, link below). To read this data, you do not use the standard playback function, you use this process called base (DMA, Direct Memory Access). The maual speaks DMA and the example code in the maual seems to use DMA to read the data that results.
We have been able to trigger the display of "binary output" on the instrument using LabVIEW and interactive control via the NOT-MAX. The question now is: How do we implement DMA by using LabVIEW? More specifically, how we implement DMA reading of the SR620. It doesn't seem to be anything close to it in the code of LabVEIW included. There are examples that use the DMA with IVIs, but we had difficulties to change to work with the SR620 code.
Useful links:
Manual for SR620: http://www.thinksrs.com/downloads/PDFs/Manuals/SR620m.pdf
Possible example DMA? : https://decibel.ni.com/content/docs/DOC-9893
DMA explination: http://zone.ni.com/reference/en-XX/help/371599J-01/lvfpgaconcepts/fpga_dma_how_it_works/
How to make DMA: http://www.ni.com/white-paper/4534/en/
Note: When we did not step 1 passed because we have problems adding a new target of the FPBA, because there is "
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