This one worked well for me: https://github.com/MajenkoLibraries/MCP23S17
For examples, search for: mcp23s17 MCP23S17 MajenkoLibraries

Bill

You are correct. I tried this originally, but couldn't get it to work. After adding the 'extern' statements, now it works. Below is the updated code. This will still come in handy, but I should point out that I won't be able to use it for clip select (CS) with SPI like I suggested in an earlier post...

Nice find! This seems to work. I still need to try it with external libraries, but it looks promising and all code changes can live within my project. Thanks for the tip! Bill extern void digitalWrite(uint8_t pin, uint8_t val) { // This overwrites the built-in implementation of digitalWrite // As a ...

Thanks for the reply. It is nice and clear on how to proceed. I believe I have the source for all of the libraries I'm using so I can do the method replace you describe. Being familiar with java, I was hoping I could override a method and route requests to my implementation or the default implementa...

I'd like to use the MCP23S17 to add more GPIO pins to my ESP32. I've done this successfully with multiple MCP23S17 chips and it works fine if I'm directly accessing the pins in my own code. However, if I want to use these pins in someone else's library (for example, setting S0, S1, S2, S3 for a colo...