I'm trying to get lightweight mesh to work on my board but I'm failing to get past PHY_Init because it seems that SERCOM4 has no dataflow. If I singlestep through the code and look at the appropriate I/O view I don't see any data on Data register for some reason. I'm running a R21 xplained (changed the device to represent my SAMR21E17, but that should not matter as the internal connections should be exactly the same to the AT86RF233 radio module.
At the moment I don't have any external clock elements and all clock configuration happens as it is in the demo application (tried with peer2peer).
Any suggestion on what I should try? Can't throw a scope on the SPI lines either for obvious reasons.