I have bought a SAMR21 XPlained Pro development board to make a redirection from 802.15.4 wireless to USB serial.
I'm newbee with this board and I try to use some ASF examples. I have successfully make a project to communicate with existing devices with the tal layer.
But USB CDC doesn't work at all. I'm using ASF 3.21.0 example (USB device CDC) without modification and when I plug the target usb to the computer my windows 7 64b says that the device is unknown and USBLyser says that enumeration failed!
I have tried all other USB example with the same issue... I don't know if it's an hardware issue or if I'm missing something to configure...