FYI: Arduino Nano ESP32 Doensn't like excisting commands like pinMode about mcp23008

[wltue]

Your a Arduino Legend, thanks for all your work within the years :-)

[RobTillaart]

This is a known problem with the Arduino Nano ESP32, imho a bug.

By renaming well known function names with macros the compiler also renames functions that are members of a class.
The Preprocessor which executes the macros (text replacements) does not know any bit of code context.
This is both a gift and horror. In this case the latter.

It is NOT an ESP32 problem as other ESP32 based boards do not have this problem.
It is definitely an Arduino NANO software design problem.

[RobTillaart]

PS,
I find it strange that you need to replace pinMode8() too as that is not in the io_pin_remap.h file

I would rename to pinMode1(), digitalWrite1(), digitalRead1(), just adding the number of bits used.
That would keep it readable and is informative.

[wltue]

Thanks. Just very busy atm. Sorry for mistakes in my report.

[RobTillaart]

No need to apologize,
This kind of reports are appreciated as they help to define the scope of the libraries.
For me, I have made an action point to check all my 200+ libraries for this and add a section to the readme.