I've also tried it with a borrowed arduino Due and it also works.

It's the board listed there. It's connected to the 2.54pin header where only i2c + power is exposed. the switch is set to i2c! I did a fresh git update. before trying a few days ago. And the patch mentioned above is present. Tried it again with todays 31.3 commit ba1efb9897 This is the code. /******...

It can find it on the BUS (if you do a scan), send and receive a few bytes then gets stuck. Yes, the board works on Arduion uno. I've added a lot of debug printf's into the code and it fails at various times. If it fails one then next time you try it will fail earlier. You have to do full reset and ...

Well even with the latest patch I2C still doesn't work with PN532 boards. e.g ones like this