Is there a sample Arduino sketch that uses the AD7856 at its full or near full sampling rate?
I read the 2013 post on this device and the Arduino, but would benefit from a more concise and tested sample sketch.
I am sorry but we do not have a software driver for the AD7856. The 2013 post, the code was developed by the person that posted thread. What application do you have? There are other ADI parts that have available software driver. You can check some of them on the ADI wiki page.