Bugger – checking ground plane integrity I realize that it is broken. The green areas have component grounding, but the 3D showed that it was connected – the real PCB is however not connected. I should have forced a track here to ensure that this was connected, but I will solder a wire on the back-side to fix this.
What happens is that the ground plane path is so thi that the CNC dropped it. This will cause BEMF3 to fail until I fix it.
Another note is that I might remove some filter components and do filtering in SW. I have plenty of MCU power available on this M4.