GPIO on the RockPro64 - all pins high?

[colinmarc]

That's because you didn't set a pull-down biasmode on the GPIOs, which by default I believe leaves them pulled up.

You can set them to pull-down bias with:

Code:

gpioset --bias=pull-down chipnum pinnum=value

There's probably also a way to set this from the device tree, but I don't know it off-hand.

In short, no, you didn't break anything.

Pin 6 should be an actual ground though, that's suspicious.

Hi, thanks for the help! I redid the wiring and tried your suggestion and now it's working!

What's odd is that connecting the LED to the GPIO GND in the circuit (ie the RockPro64's GND) works, but using the GND on my breadboard (connected to another microcontroller or a common ground, same thing) doesn't seem to work. I guess I'm missing something basic about GPIO or microcontrollers, which is maybe outside the scope of this board.

Thanks again!