How to put SPI lines of NI-8452 into HI Impedance State?

[jeet]

Hello,

When NI-8452 module is first connected to the USB port of the computer, the SPI lines and Chip Select (CS) lines are in High Z state. After that we initialized SPI, do the communication and then close the SPI using ni845xclose function. When ni845xClose function is called, I expected the SPI lines lines and CS line to return to its initial high impedance state, but it did not do that.

My question is: How can I put SPI lines back to High Z state?

Thanks,

Jeet

[Doug-B]

Hey Jeet,

Check out this KnowledgeBase article:

http://digital.ni.com/public.nsf/allkb/CC435028E71BE6988625751A0063EA1F?OpenDocument

It looks like if you are using the Basic API the lines do not go back to their high impedence state when closed. 

Hope This Helps,

Doug B