Erm.. very good question. It indeed is the same external power supply connected to the Beagle Board. Or I would say all the power come from the same ATX power supply though it might (tiny little chance) be in different rails.
Frankly speaking the line was rather short (less than 5cm) so I didn't bother to do shielding at all. The D+ and D- is using Cat5 ethernet cable. Does it make any significance? Regards, Bai Shi On Mon, Oct 28, 2013 at 9:56 PM, Paulo Ferreira <p...@keeh.net> wrote: > > On 28/10/2013, at 13:27, Bai Shi <baishi...@gmail.com> wrote: > > > My usb device draws power from external power supply, only D+ and D- is > connected to BBB. It works 90% of time but when I mess around too much > (on/off too frequently maybe, not confirmed), it will reset the USB of BBB > and then it will behave very strangely. Every access to /sys/bus/usb take > more than 15 seconds and timeout eventually. > > > > Hope my experience gives some hint... > > Is the same external power supply connected to the Beagle Board? > > So, the ground shield of the USB cable is connect only on one side (the > device) or is it completely "floating"? > > Best regards > > Paulo Ferreira > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/nuyyVDhU6bw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
