Quote Originally Posted by Doddy View Post
Have you checked the pulse width from the UC400 ETH?, I don't know how but I've noticed its an option in the UCCNC software. The AM882 needs >2.5us for reliable operation. Worth a look?
Pulse width is not an option. It's a function of the kernel frequency. I believe that you need to use 200Khz or less to get 2.5us pulse width.