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Can't connect my FSESC through USB

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Tue, 2022-01-11 04:31
#1
digo_bob
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Last seen: 4 years 7 months ago
Joined: 2022-01-08 16:04
Posts: 1
Can't connect my FSESC through USB

Hi all,

 

I ran my FSESC 4.20 based on VESC 4 through VESC tools, updated the firmware, changed configs as I saw fit and configured input all good. After disconnecting, the ESC seemed to be working fine, it controlled the motor just as intended and reacted quite well to the input commands. However, when I tried to reconnect it to test a different input method, the PC wouldn't recognize the FSESC 4.20 anymore.

I tried three different USB cables, and they're working fine with different devices. Also tested all USB ports in the computer and they also seem to be working fine. I looked for the COM port in device manager, but it isn't there. I can connect my STM32 Nucleo board through USB and COM port will show up, but nothing with the FSESC 4.20. When I look in the device manager, the FSESC 4.20 shows as "Unknown USB Device (Device Descriptor Request Failed). Does anyone know what is happening and how to fix this?

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Sun, 2022-12-25 16:17
Snabelost
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Last seen: 2 years 1 month ago
Joined: 2022-08-24 10:05
Posts: 22

I have the same problem. After turning on vesc with usb cable connected it all looks good in device manager, but after issuing "Autoconnect" in vesc tool the port is lost in device manager and says "Unknown USB Device (Device Descriptor Request Failed)". I have tried both 3.01 and 6.0 vesc tool version.

It all worked a few months ago using same laptop.

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Tue, 2022-12-27 19:51
Ganzey
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Last seen: 2 weeks 5 days ago
VESC Free
Joined: 2021-06-14 00:42
Posts: 11

i had a somewhat similar problem with a 75100, usb didnt work right out of the box. didn't bother diagnosing the circuit to see why, ordered a bluetooth module and connected to it that way and it works great now, 

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Tue, 2026-08-25 08:33
thuffam
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Last seen: 7 hours 46 min ago
VESC Free
Joined: 2026-06-06 23:35
Posts: 1

Same problem here using FSESCv6.8. with error: USB  device not recognised (windows 11).  same cable and laptop as used the day before but just not working today.   Google AI recommended the followng that seemed to fix it:

1. Disable USB "Selective Suspend"

Windows frequently updates in the background and turns on a power-saving mode that disables "inactive" serial connections, which causes sudden overnight connection drops. [1, 2]

  1. Press the Windows Key

    , type Edit Power Plan

    , and click it.
  2. Click Change advanced power settings

    .
  3. Scroll down and expand USB settings

     -> USB selective suspend setting

    .
  4. Change both "On battery" and "Plugged in" to Disabled

    .
  5. Click Apply, then click OK.

2. Uninstall the dogy device:

  • Open Device Manager

     (Win + X

    -> select Device Manager

    ).
  • Expand the Universal Serial Bus controllers

     category at the bottom.
  • Look for Unknown USB Device (Device Descriptor Request Failed)

    .
  • Right-click it, select Uninstall Device

    , and confirm.
  • reboot
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