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Topic-icon XDC2460S units (4 out of 6) do not enumerate on USB

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5 months 5 days ago #29534456 by dCentralized
We have been using 2 XDC2460S units, over USB, for months, with no issues. These units where ordered in August/September of 2017.

We then ordered 6 more in November, and this batch of units has had major issues enumerating/working over USB. Note that in *all* cases, the LED indicators show normal operation (green, green, orange)

When you plug in a unit. you see the errors below (this is from the linux kernel log, reproduces on all linux devices I have tried, PIs, intel NUCs running Ubuntu, etc. Also, they do not enumerate on Mac OSX either).

What is bizarre is that 2 units worked for a week, then after a regular power cycle, they stopped working, showing the USB failures the rest of the units showed from day 1.

Any ideas? Can we return them and get new units?



[ 80.116209] usb 1-1.1.3: device descriptor read/64, error -32

[ 80.556150] usb 1-1.1.3: new full-speed USB device number 19 using dwc_otg

[ 81.466045] usb 1-1.1-port3: Cannot enable. Maybe the USB cable is bad?

[ 81.466150] usb 1-1.1-port3: attempt power cycle

[ 82.935756] usb 1-1.1-port3: Cannot enable. Maybe the USB cable is bad?

[ 83.035572] usb 1-1.1.3: new full-speed USB device number 21 using dwc_otg

[ 83.475723] usb 1-1.1.3: device not accepting address 21, error -32

[ 83.475861] usb 1-1.1-port3: unable to enumerate USB device

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5 months 5 days ago #29534457 by Gabriel_Isko
If the USB light is on, they should have a successful connection, at least hardware wise. Are you sure that your cable isn't bad?

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5 months 5 days ago #29534458 by dCentralized
Hi Gabriel, we have tried 8 different cables. The same cable *works* with other USB hardware and with our last working roboteq. That batch of 6 has been incredibly flaky.

Also, did you notice I mentioned the same controllers *worked*, with the same cable, for a week, then stopped working?? Then 2 out of the same batch never worked, showing this USB issues immediately.

we also tried different USB ports (direct to the PI, or through a HUB), same problem.

at this stage, given our multi year experience with at least 4 different motor controller vendors, we are seriously doubting this is something "simple" like a cable. So unless you have something you want me to try, can we please get either a refund or an exchange started?

thanks
g

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5 months 5 days ago #29534459 by dCentralized
Btw, we have tried USB cables from different vendors as well, just in case, same issue.
On ubuntu and Intenl NUC hardware, we get slightly different/more kernel logs regarding the USB plug event. This is really does look like a client (device) side link layer issue.

355629.088652] usb 3-1-port1: connect-debounce failed
[355632.915218] usb 3-1.1: new full-speed USB device number 116 using xhci_hcd
[355632.995234] usb 3-1.1: device descriptor read/64, error -32
[355633.183254] usb 3-1.1: device descriptor read/64, error -32
[355633.371219] usb 3-1.1: new full-speed USB device number 117 using xhci_hcd
[355633.451252] usb 3-1.1: device descriptor read/64, error -32
[355633.639250] usb 3-1.1: device descriptor read/64, error -32
[355633.747752] usb 3-1-port1: attempt power cycle
[355634.351166] usb 3-1.1: new full-speed USB device number 118 using xhci_hcd
[355634.351335] usb 3-1.1: Device not responding to setup address.
[355634.559362] usb 3-1.1: Device not responding to setup address.
[355634.767193] usb 3-1.1: device not accepting address 118, error -71
[355634.847201] usb 3-1.1: new full-speed USB device number 119 using xhci_hcd
[355634.847372] usb 3-1.1: Device not responding to setup address.
[355635.055378] usb 3-1.1: Device not responding to setup address.
[355635.263186] usb 3-1.1: device not accepting address 119, error -71
[355635.263996] usb 3-1-port1: unable to enumerate USB device

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5 months 5 days ago #29534460 by Gabriel_Isko
Email this issue to This email address is being protected from spambots. You need JavaScript enabled to view it. and we will get a return started and provide a failure analysis report when we receive the unit.

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