Date: Tue, 15 Feb 2022 18:47:29 +0800 From: Archimedes Gaviola <archimedes.gaviola@gmail.com> To: "Daniel O'Connor" <darius@dons.net.au> Cc: mike@karels.net, freebsd-arm@freebsd.org Subject: Re: Raspberry Pi 4B does not detect devices in USB 3.0 Message-ID: <CAJFbk7FmYC4=SAnwss4XCR6RAE__bBdiisiQPjt2Xm63_7uffA@mail.gmail.com> In-Reply-To: <D9CA3262-2827-465F-9A3B-C200150EB77A@dons.net.au> References: <CAJFbk7E=t4ezXVgTTGQdsxNbAEgUJfRU5Phk=gy4m2ovBMzhww@mail.gmail.com> <202112231500.1BNF0FgX014693@mail.karels.net> <CAJFbk7EAoit=e-14sg7YGHMtf7qWA5VjDgnnn4xt9tMERjt17Q@mail.gmail.com> <E3005D55-FE54-4911-89C7-1E017975A1CA@dons.net.au> <CAJFbk7FFtq9xQW9rWZM5Vx-wQ09B47zkwPWrjzLnbNfAFeCvhw@mail.gmail.com> <CAJFbk7ERFyf1DGP4E4=F295o7YLOUCcZxi0JpWZPoz52JhK_AA@mail.gmail.com> <D9CA3262-2827-465F-9A3B-C200150EB77A@dons.net.au>
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--00000000000012548405d80c4324 Content-Type: text/plain; charset="UTF-8" On Tue, Feb 15, 2022 at 6:22 AM Daniel O'Connor <darius@dons.net.au> wrote: > > > > On 14 Feb 2022, at 23:10, Archimedes Gaviola < > archimedes.gaviola@gmail.com> wrote: > > I just tried my new RPI4 board and it seems to work fine the same as my > old board. I just observed that the problem is when my VFD (vacuum > fluorescent display) device is connected to either of the two USB 3.0 > ports, this device having uplcom(4) driver is not detected. > > I wonder if the VFD is causing interference - it likely has a high voltage > supply and those are notorious for generating electrical noise. > > > It's a Prolific USB-serial device having PL2303 chipset. However, when > plugged-in to USB 2.0 ports, this device is detected and functioning. I can > send characters with the echo command and redirect it to /dev/cuaU0 for > display without any problem. Other observations when this VFD device is > connected to either 3.0 ports, the 2.0 ports will not function i.e. > plugging-in any USB devices like my keyboard or my EMV reader. When this > device is also connected to either of the 2.0 ports, the other 2.0 port is > functioning for other USB devices while 3.0 ports are not. I attached two > dmesg outputs when the device is detected with 2.0 ports and undetected > with 3.0. I also include kldstat and usbdump. > > I would be curious if putting the VFD on a longer cable, or wrapping the > cable through a ferrite, or using an external hub fixes it. > > Any of those would give a bit more isolation between the VFD and USB3 > hardware. > Thanks Daniel for your recommendations, I've tried extending it to a long cable and using an external USB hub however the outcomes were still the same, it cannot be detected. As per checking, this device has a default ferrite bead clamped over its USB cable. Using the same RPI 4B hardware, this VFD device has been tested as well with OpenBSD 6.9 and CentOS 8. They both work with USB 3.0 except OpenBSD system will panic the first time you plug-in the device but will work fine after a forced reboot or when you unplug and plug back the power. Thanks, Archimedes --00000000000012548405d80c4324 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div dir=3D"ltr"></div><br><div class=3D"gmail_quote"><div= dir=3D"ltr" class=3D"gmail_attr">On Tue, Feb 15, 2022 at 6:22 AM Daniel O&= #39;Connor <<a href=3D"mailto:darius@dons.net.au">darius@dons.net.au</a>= > wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px = 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br> <br> > On 14 Feb 2022, at 23:10, Archimedes Gaviola <<a href=3D"mailto:arc= himedes.gaviola@gmail.com" target=3D"_blank">archimedes.gaviola@gmail.com</= a>> wrote:<br> > I just tried my new RPI4 board and it seems to work fine the same as m= y old board. I just observed that the problem is when my VFD (vacuum fluore= scent display) device is connected to either of the two USB 3.0 ports, this= device having uplcom(4) driver is not detected.<br> <br> I wonder if the VFD is causing interference - it likely has a high voltage = supply and those are notorious for generating electrical noise.<br> <br> > It's a Prolific USB-serial device having PL2303 chipset. However, = when plugged-in to USB 2.0 ports, this device is detected and functioning. = I can send characters with the echo command and redirect it to /dev/cuaU0 f= or display without any problem. Other observations when this VFD device is = connected to either 3.0 ports, the 2.0 ports will not function i.e. pluggin= g-in any USB devices like my keyboard or my EMV reader. When this device is= also connected to either of the 2.0 ports, the other 2.0 port is functioni= ng for other USB devices while 3.0 ports are not. I attached two dmesg outp= uts when the device is detected with 2.0 ports and undetected with 3.0. I a= lso include kldstat and usbdump.<br> <br> I would be curious if putting the VFD on a longer cable, or wrapping the ca= ble through a ferrite, or using an external hub fixes it.<br> <br> Any of those would give a bit more isolation between the VFD and USB3 hardw= are.<br></blockquote><div><br></div><div>Thanks Daniel for your recommendat= ions, I've tried extending it to a long cable and using an external USB= hub however the outcomes were still the same, it cannot be detected. As pe= r checking, this device has a default ferrite bead clamped over its USB cab= le.<br></div><div><br></div><div>Using the same RPI 4B hardware, this VFD d= evice has been tested as well with OpenBSD 6.9 and CentOS 8. They both work= with USB 3.0 except OpenBSD system will panic the first time you plug-in t= he device but will work fine after a forced reboot or when you unplug and p= lug back the power.<br></div><div>=C2=A0</div><div>Thanks,</div><div>Archim= edes<br></div></div></div> --00000000000012548405d80c4324--
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