Getting clock to run longer than CS signal in NI USB-8452 SPI

[todd1313]

Hi,

I am very new to SPI and not very versed with Labview but I when using the SPI VIs the clock pulses stop when the Chip Select goes from high to low.  The application that I am trying to interface is using the CS in an inverted manner from normal, it is low undernormal conditions but goes hi to communicate.  With the board that I am using, the data is transmitted after the CS goes back to the low state but I need the clock pulses to keep going to get the data.  Is there a way to keep the clock pulses going past the CS transition?

[KathrynTheGreat · Accepted solution]

If your target device uses the CS line in an inverted manner, and accomodating that in software is giving you unexpected results, could you add a physical inverter on the line to the target? That way, the target can use its inverted CS logic, but the rest of the system could operate as normal.

[GPIB_Guru]

You can use the scripting API to do an inverted CS signal, since you control it manually.

[todd1313]

The physical inverter may be the way to go.  The CS line defaults to high while I need low.