Re: Raspberry Pi 3B Over-current USB

On Mon, Apr 11, 2022 at 9:59 PM Hans Petter Selasky <[email protected]> wrote:

> On 4/11/22 15:59, Archimedes Gaviola wrote:
> > Hi Hans,
> >
> > Noted on the self-powered hub, thanks for the suggestion, I will try.
> >
> > Just wanted to share the observation from the testing I've conducted with
> > my Raspberry Pi 4B with the same 14.0-CURRENT to check if overcurrent is
> > also experienced and it did, there was overcurrent and each ports' power
> > shut-off during the situation but it was able to recover back. I
> initiated
> > the command 'usbconfig reset' and each port gloriously came back alive
> one
> > by one and loaded my USB keyboard and Prolific uplcom(4) drivers into
> > functional and operational states. My measuring device is showing the
> same
> > amount of current 460mA while the voltage stayed at 5.05 from a baseline
> of
> > 5.15 voltshttps://filebin.net/10vy575q6h2yl8og. Unlike my RPi 3B,
> voltage
> > dropped to 4.93 from a baseline of 5.19 volts. So, the difference I
> > observed is when the voltage dropped below 5, the system will not give a
> > chance to make the ports come back alive as a sort of protection
> mechanism.
> > Sharing to you the logs below (with hw.usb.uhub.debug=1).
>
> FreeBSD does not actively check and use "bMaxPower" .
>

Hi Hans,

It's okay, just tried your recommendation on a self-powered USB hub, my
Prolific device is now working. Thanks a lot!

Archimedes