Posts: 85
Joined: Sun Jul 16, 2017 3:43 pm

Carrier board what do I need to use USB OTG?

Thu Sep 06, 2018 2:29 pm

Found out from previous threads I would need to connect pin 4 on a AB usb to the USB_OTGID pin on the CM3.
I am also powering both of the GPIO VRef pins (0-27 & 28-45) with 3.3v
Wondering if that is all I am required to do in order to access serial via usb micro?

I know on the CMIO there were a numerous of solutions because of R12 that acted as a pull-down.

Solutions included:
  • Desoldering R12 and jumper from USB_OTGID to GND whenever didn't require gadget mode.
  • Jumper to 3v3 without removing R12
  • Downloading new dwc2 driver
Besides the 2 things I've already done as stated above, is there anything else I need to do in order to access terminal on the CM3 in my carrier board design?

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