Troubleshooting • Re: Rpi Zero 2w otg vs usb

What am I doing wrong ?

I am quite experienced with Rpi 4 but have great difficulty with Rp Zero 2W.

I cannot get the USB to work as a ...usb!

There are 2 mini/micto usb ports on the board. The (righthand) port ...nearest corner is
labelled power in. The other is this otg stuff! which is where I am stuck.
I just wanta standard usb

Connect to Zero (headless) with ssh & edit the /boot/config.txt file (dtoverlay=dwc)
& the /boot/cmdline (modules-load=dwc2,g_ether) file as described in
many rpi help sites.

Did you reboot after making those changes?

Connect usb camera on (left) port. lsusb - gives
Bus 001 Device 001:......root hub. I think this refers the
power port. Try a reboot and redo lsusb - same message.

That's the root port. You camera has not been detected.

What am I missing ? Should lsusb show more ..as it does on a Rpi4 ?

lsusb will show all connected and detected USB devices.

There is one(1) USB port on a zero series Pi. The default driver puts it into host only mode so all you need is a suitable micro USB B to USB A female adapter. There is no need to modify config.txt or cmdline.txt.

Usual troubleshooting steps apply:

• Try the camera with another Pi (e.g. a 4B)
• Try a different microB to A adapter. The one you have may not be pulling the ID pin correctly to indicate host mode is required.
• Undo your changes and see if the camera is detected
• Check for errors in the output from

  Code:

  dmesg

If you actually want to use both g_ether and a USB camera at the same time you can't. There is one controller with one port. It can do host or device and swap between them but not both simultaneously.

[shameless self promotion]
USB Ethernet Gadget A Beginner's Guide
[/shameless self promotion]

Statistics: Posted by thagrol — Fri Mar 07, 2025 1:19 pm

---