topic Re: USB Communication between to self powered boards in i.MX Processors

USB Communication between to self powered boards

DSEngineer — Mon, 04 Oct 2021 14:45:47 GMT

Hi Everyone,
I'm working on a design and I'm not sure it will work properly.
Mainly because the USB is OTG and there is no VBUS connection between the boards.
I want to make a connection between two boards, each board has it's own power supply, there is no VBUS connection between the boards. One board will function as a master and the other as a device.
Does anyone have suggestions for repair/addition or advice on how to do it better?
I added a picture to illustrate the connection between the boards.

Re: USB Communication between to self powered boards

igorpadykov — Mon, 04 Oct 2021 23:27:32 GMT

Hi Daniel

for communication between two boards one can try to use usb unit tests, configure

one board as host other as device:

https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_usb_test?h=lf-5.10.52_2.1.0

Best regards
igor

Re: USB Communication between to self powered boards

DSEngineer — Tue, 05 Oct 2021 06:50:48 GMT

Hi Igor,
Thanks for the help.
Yes, I was thinking about this configuration, but when one is set as a device he does not expect to get 5V in VBUS? Will there be a VBUS on the side of the device or will I have to connect the VBUS directly to 5V?

Re: USB Communication between to self powered boards

igorpadykov — Tue, 05 Oct 2021 08:16:36 GMT

>Will there be a VBUS on the side of the device or will I have to connect the VBUS directly to 5V?

on device side VBUS can be connected directly to 5V.

Best regards
igor