The original Teensy USB driver contained some code to helpfully clear any pending IN transactions when a new SETUP comes in. But this violates hardware's assumptions by messing with BDT entries from buffers that are still owned by hardware. Argh! This was causing the SIE to lock up while processing a SETUP immediately after a long control OUT transaction.

This one is apparently below the resolution of the gerber *shrug*

Currently just a copy of the SFE CAM template

This design is not yet proven. It's a really tiny minimal Fadecandy board
with a 5V boost converter and level shifter circuit.