started working on a simple breakout
add SWD connector, though the VCC might *not* be (even equivalent to) the STM32 VDD, which would be a major problem
The VCCs might not be the same, at least not in the future...
use solder jumpers to select which "vcc" pin to use for SWD VDD
add reset switch
receptable on top of board, header at bottom
updated the df37 library changes