That sounds reasonable. I wondered too what difference it would make to cut the wire. Ideally I would prefer not to fall back to such substandard modifications. I'm happy with the workaround though.
regards, Teis On 25 November 2014 at 21:37, William Hermans <[email protected]> wrote: > Glad it worked for you. My guess is while power is being fed back into the > beaglebone, the USB get puts into another Mode of operation. But I have not > looked into that personally, so again is just a guess. > > On Tue, Nov 25, 2014 at 1:29 PM, Teis Draiby <[email protected]> wrote: > >> Thank you for the responses, >> >> beyond all expectations cutting the red power wire of the USB cable >> connecting the Beaglebone (A/host port) to the USB hub (mini/client port) >> actually did solve the problem. I now have the Maple board serial device >> ttyACM0 available again. >> >> (for information, both the Beaglebone and the USB hub are powered >> independently, and the Maple board is powered through the USB hub.) >> >> >> Thanks for the hint on this, Teis >> >> >> Den tirsdag den 25. november 2014 04.13.14 UTC+1 skrev William Hermans: >>> >>> Expanding on what liyaoshi just posted. I remember someone else having a >>> similar problem but with a different device. His solution was to cut the >>> power wire feeding back from the USB hub back into the beaglebone. However, >>> as said above he / she used a different device, and the device its self was >>> not showing up at all under lsusb output. Also, I'm fairly sure the USB hub >>> was self powered. >>> >>> On Mon, Nov 24, 2014 at 7:14 PM, liyaoshi <[email protected]> wrote: >>> >>>> check your usb hub power supply ? >>>> >>>> 2014-11-25 0:29 GMT+08:00 Teis Draiby <[email protected]>: >>>> >>>>> >>>>> I am currently communicating between my Beaglebone and a Maple board >>>>> via a serial connection directly through a USB cable. This works well. >>>>> (LeafLabs Maple is an Arduino-like board with an on-board USB connector) >>>>> >>>>> Due to power requirements I want to relpace the direct USB connection >>>>> with a power supplied USB hub but when connecting the Maple board this way >>>>> I do no longer see the serial device listed. >>>>> >>>>> I am new to Linux/Debian and am unsure what to do from here, and if >>>>> it's even possible to perform serial communication through an USB hub. >>>>> >>>>> ------------------------------------------------------------ >>>>> ----------------------------------------- >>>>> Direct USB(Beaglebone)-to-USB(Maple) serial communication (works) >>>>> ------------------------------------------------------------ >>>>> ----------------------------------------- >>>>> Beaglebone terminal: >>>>> >>>>> # uname -a >>>>> Linux beaglebone 3.8.13-bone47 #1 SMP Fri Apr 11 01:36:09 UTC 2014 >>>>> armv7l GNU/Linux >>>>> >>>>> # lsusb >>>>> *Bus 001 Device 003: ID 1eaf:0004* >>>>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>>>> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>>>> >>>>> # ls /dev/ttyA* >>>>> */dev/ttyACM0* >>>>> >>>>> ------------------------------------------------------------ >>>>> -------------------------------- >>>>> Serial communication through USB hub (missing serial device?) >>>>> ------------------------------------------------------------ >>>>> -------------------------------- >>>>> Beaglebone terminal: >>>>> >>>>> # lsusb >>>>> *Bus 001 Device 002: ID 05e3:0612 Genesys Logic, Inc. *<- this >>>>> only shows up when using a special hd-USB cable. >>>>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>>>> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>>>> >>>>> # ls /dev/ttyA* >>>>> ls: cannot access /dev/ttyA*: No such file or directory >>>>> >>>>> # ls /dev/ttyU* >>>>> ls: cannot access /dev/ttyU*: No such file or directory >>>>> >>>>> ------------------------------------------------------------ >>>>> -------------------------------- >>>>> >>>>> >>>>> Any advice from here is greatly appreciated. >>>>> >>>>> >>>>> thanks, Teis >>>>> >>>> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
