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TM4C1292NCPDT: USB serial communication failure

Eric S
Expert 5640 points
Part Number: TM4C1292NCPDT

I’ve recently run into issues where the USB serial communication between the host and the microcontroller (a TM4C1292NCPDT) fails after a relatively short period of time.  The issue only seems to happen on older PCs (I’ve noticed that all of the PCs that have had failures did not have a USB 3.0 port).

 

The microcontroller is setup as a USB composite device with 2 serial interfaces, one that is used as a command line, and another that is used as a binary interface.

 

When the communication fails, the PC reports that it is unable to set the parameters of the serial link.

 

Are you aware of any similar issues and/or workarounds?

  • 0
    TI__Guru*** 135355 points
    Hello Eric,

    Are the older PCs also using older OS like Win XP or Win 7, or have they been upgraded to Win 10?
  • 0
    Guru 117855 points

    Eric S said:
    The issue only seems to happen on older PCs

    Note that this implies - but does not positively state - that newer PC usage is similar in duration & operation.      Is this the case?  

    Clients of ours have reported similar occurrences - yet most always when the "binary interface was operated in a (near) continuous mode."      I can check if helpful - iirc the issue was resolved...

  • 0 in reply to cb1_mobile
    TI__Expert 5640 points

    The older PCs are generally running Windows 7.  They haven’t been able to test this on an old PC that has Windows 10. This last happened at a customer site, so they are trying to get any old PC I can find to attempt to replicate and narrow down the conditions.

     

    If you can please check if the previously reported issues with near-continuous binary interface were resolved, I would appreciate any guidance to possible resolution.

  • 0 in reply to Eric S
    Guru 117855 points
    So much time has passed (Dec 22 - Jan 5) I'm unsure if I can (now) "re-inspire" that client...
  • 0 in reply to Eric S
    TI__Guru*** 135355 points
    Hello Eric,

    I did some browsing around and haven't found anything comparable. Unfortunately I don't really know a lot about the finer details of composite devices, much less one used as a binary interface, so I don't really have any speculation to offer based on the problem statement as is.

    My question about OS was due to Windows Driver issues with Win10 and Composite examples, but seems those can be ruled out.