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. > -- 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.
