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Easiest thing to check is to make sure none of these options are selected for the pin configuration, as they will require the use of an SIO pin:
- Hot Swap
- Input Threshold Level set to:
- 0.5 x Internal/External Vref
- Internal/External VRef
- Drive Level set to External/Internal VRef
- Drive Current set to 25mA sink
Thanks! Actually, it now seems that the problem was the we were routing this I/O pin to an input, but the input buffer was not enabled in the pin dialog box. The error message was definitely not helpful!
At any rate, we seem to have resolved the issue by correctly defining the pins as bidirectional.
Good to know you figured it out!
Still, strange that setting would trigger an error message about SIO. Maybe it's a bug? It looks like that only time the input buffer should ever be disabled is to save power when not in use or when using the pin as an analog. It should have nothing to do with SIO.