Hi，I have the same issue with musb babble interupt. some low speed mouse can enumerate normally on my box, some mouse will always fail. For the failed mouse, there is always a babble interrupt, and the host mode lost(DEVCTL is 0x98). But I can work around with a externsion cord(about 1.5m), all the failed mouse can work in this case. Could you give me some hint for debugging this problem? I think it may be the bug with mentor's USB ip.
On Monday, October 28, 2013 11:27:09 PM UTC+8, Shi Bai wrote: > > Erm, ok. I'll look for a good shielded cable.. > > > On Mon, Oct 28, 2013 at 10:42 PM, Paulo Ferreira <[email protected]<javascript:> > > wrote: > >> You issue may be there (or not). >> >> To really really know, you can use some wide bandwidth digital >> oscilloscopes to see how the USB signals are behaving. >> Or try to use a good shielded USB cable. >> >> Guess what is the cheapest option, try it, and after that please tell us >> what did you find. >> >> Best regards >> Paulo Ferreira >> >> >> >> >> >> >> >> On 28/10/2013, at 14:22, Bai Shi <[email protected] <javascript:>> wrote: >> >> > 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 >> > <[email protected]<javascript:>> >> wrote: >> > >> > On 28/10/2013, at 13:27, Bai Shi <[email protected] <javascript:>> >> 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 >> [email protected] <javascript:>. >> > 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 [email protected] <javascript:>. >> > 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 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 >> [email protected] <javascript:>. >> 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 [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
