Re: Raspberry Pi 3B Over-current USB
- Reply: Archimedes Gaviola : "Re: Raspberry Pi 3B Over-current USB"
- In reply to: Hans Petter Selasky : "Re: Raspberry Pi 3B Over-current USB"
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Date: Tue, 12 Apr 2022 09:16:02 UTC
On Mon, Apr 11, 2022 at 9:59 PM Hans Petter Selasky <hps@selasky.org> 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