As for adding ground pin to USB and SWD connectors, the USB will be more as a backup in case I can't use SWD for flash programming, and I won't assemble connectors themselves, but rather leave the through holes present and use jumpers on them, like this:Looks fairly respectable now.
I'm not sure why the I2C bus gets extra-wide tracks: I'd be inclined to make them the same size as all your other GPIOs (looks like 0.15mm?) and have back the extra space on the underside.
Your USB connector really needs a ground pin: you don't need power for a functioning USB, but you do need ground. Obviously you could bodge it on somewhere, but if you plan to use the USB it would make more sense to provide a 3-pin connector. Looks to be plenty of room if you spin R3 round below D2.
Same applies to the SWD connector but there's less space - if you are just wiring this up to make the signals available for emergency use, then maybe you accept that you bodge on a ground when required, but if you plan to make regular use of the SWD then a 3-pin connector makes more sense. Maybe adopt the smaller JST connector as used on PicoW etc?
Statistics: Posted by LIOTH — Tue Oct 22, 2024 8:41 am