That is exactly my board. The AT32F403 chip is (I think) more or less the same as the GD32F403RCT6, which provides a bit more support/documentation. I have made a schematic of the board.
Here are some resources for the GD version of the chip:
And for the AT32F403 chip:
I have just started working on it, but not much time right now. Pretty sure it will not run the firmware directly, but it should not be too hard to port. I will let you know if I make any progress
Originally posted by @TomTinkering in #97
Originally posted by @TomTinkering in #97