I'm connecting a DAC (runs at more than 1.8V) to the SPI bus and I'm using a cheap level shifter. I've posted on a recent thread related to this. (my post is shown below)

You can get cheap level shifters.
This is the one I'm using: http://www.datasheetcatalog.org/datasheet/motorola/MC14504BCL.pdf

You can simply place it on a breadboard, and the wiring is pretty simple from there. Take a look at the link to the data sheet I provided above. FYI: I bought mine for less than a dollar. :)

Good luck!

Victhor wrote:
I don't know what modifications are necessary, but they are around the
mailing list IIRC. You only need a logic level converter to use SPI
devices that don't run at 1.8V.
  
On Monday, July 19, 2010 06:13:07 pm Victhor wrote:
    
If that sensor doesn't run at 1.8V there's a great chance that you may
have ruined your board. Also, SPI needs some modifications to the kernel
to work with other devices that's not the ADS7846 resistive touchscreen
controller on the Palo35, Palo43 and Chestnut43 expansion boards, it
seems.
      
What are the modifications that need to be done? I have an ethernet switch IC 
that I'd like to talk to over the SPI interface (I do have level translators 
in the circuit).

Do you have links or other information about modifying the kernel for the SPI 
interface on the Overo?

-A.


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