I've tried digitalWrite(pin,HIGH) after setting the pinMode(pin, INPUT_PULLUP), but that was no help.
I've attached pin interrupts to every pin and they all seem to float unless I use an external pullup resistor. If I use an external pullup resistors, everything seems to work just fine. Is there something I'm missing in order to get the internal resistors to be activated? Or are there no internal pullup resistors in the Artemis Apollo3 cores? I can't find anything that tells me there isn't. And there is a ton of code that uses the INPUT_PULLUP mode.
Shouldn't digitalRead() return a HIGH value if I set a pin to INPUT_PULLUP while the pin is not connected?
This is my first Artemis board and I'm hoping I'm just missing something.
RedBoard Artemis Nano from SparkFun using Apollo3 board library in the Arduino 1.8.19 IDE.