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RESOLVED: STM32F411 Black Pill - I2C Ch2 mapping

Posted: Sat Jan 17, 2026 4:26 pm
by Brendan
I'm using multiple STM32F411 Black Pill boards in a project, selected in FC build options, though the only mappable pin available in FC for I2C Ch2 SDA is PB11, which doesn't exist on the Black Pill (only available on the BGA 100-pin package). I believe CH2 I2C SDA should actually map to PB3.

I haven't checked other IO mappings, though I need both I2C channels to directly service two separate I2C devices.

Many thanks,
Brendan

Re: STM32F411 Black Pill - I2C Ch2 mapping

Posted: Sat Jan 17, 2026 6:25 pm
by LeighM
Looks like AF9 got missed, try this ...
32F411CE_BlackPill.fcdx
(51 KiB) Downloaded 12 times

Re: STM32F411 Black Pill - I2C Ch2 mapping

Posted: Sat Jan 17, 2026 9:51 pm
by Brendan
Thank you Leigh, that worked, and I'll simply ignore the prevailing PB11 in the list.

There appears to be similar errors across other 32F411 definitions, though I can now move on following your early support.

Thanks again and best regards,
Brendan