Re: Raspberry Pi 3B Over-current USB

From: Hans Petter Selasky <hps_at_selasky.org>
Date: Mon, 11 Apr 2022 13:59:10 UTC 
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" .

--HPS