Hello,

I'm using a BPI M2 Zero (with H3 Chip) to control two relays on CON2-P05 / PA11 and CON2-P03 / PA12.

During the boot process there is a high level present at the pins, which is driving the relays.

Is there a way to create a DTB overlay to drive the pins to a low level during boot.

My userspace application uses  libgpiod to control the pins.

 

I'm familiar with compiling and activating overlays, i would just need help to write the correct .dts file.

 

Thank you very much in advance

I solved the issue on hardware level. It turned out that those pins had external pull-ups.

I switched to two other pins which worked just fine.