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It's an STM32F401RCT6, on an eBay breakout board for LQFP packages. I can't believe it actually runs, it looks so messy.
It's pretty much just all the VDD and VSS pins hooked up to 3.3V from the serial-usb adapter. I've put in all the recommended capacitors and I used the SWD pins to load on Espruino using the St-link from my Nucleo board. Just trying to get a feel for what's required for an stm32 board to work, just like a breadboard arduino...except there's no breadboard.
the1laz
@Gordon
Wow, looks pretty awesome! What's on it? So the green board is just a breakout for the LQFP?