Reliably detect if a pin is high or low if it might be floating?
Is there are way to reliably detect if a pin is high or low if it is possibly floating on the P1? I made a mistake on a board layout years ago by not including a pulldown on an optional accessory output, and now want to detect if an accessory board is installed. I have not tested if just placing a pullup would work, but I am not sure if it would work reliably. I suspect with it is floating, it may false positive as "high".