Great for you keija and that_kid. Do as I did: Request a couple of samples of each transceiver to Atmel. I have some sample sketches running OK on my Due, using a combination of Atmel and Arduino library files. The goal is to occupy as much as Arduino files and as less as Atmel files as possible. I also hope to run my first real test these next days interfacing Due with a battery manager system (with XC167CI - by Infineon and AT91SAM7).