I'm looking for some help with setting up a Labview VI to use SPI communication between an NI-8452 and a texas instruments ADS1278 A/D converter evaluation board. From all of the sample VI's I have seen the LabVIEW routines vary widely for different models of Texas Instruments ADC's. My issue is how to deal with the DRDY pin on the ADC; it is an active low output from the ADC and signals when valid data is ready for retreival.
There is a DRDY pin listed under the SPI stream configuration property node, but I am not sure how to set this up as it is a seperate pin from the standard SPI 4-wire communication (SCLK, MOSI, MISO, and CS). Also, this ADC does not use the chip select (CS) line. I would like to set the program up so that an interrupt is triggered when the DRDY pin pullls low and enters a standard SPI stream routine.
Any information on how to deal with this DRDY signal would be greatly appreciated.
http://www.ti.com/lit/ug/sbau197/sbau197.pdf
http://www.ti.com/lit/ds/sbas367f/sbas367f.pdf
Thanks,
Grant