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@Gordon
Thanks for letting me know - if the pin state was manually set then yes, it probably shouldn't overwrite it. I'll push a change to this now so you can play around.
However I'm not 100% sure if you can actually do what you want. Even if it looks like you can from the circuit diagram, section 9.1 in the F103 datasheet implies that you can't (see below). It gets even more strange when you look at the F401 too.
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