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Quadrature Decoding possible on any TM4C

Evan W
Mastermind 40660 points

Hello,

Is quadrature decoding possible on any TM4C MCU? 

Thanks,
Evan

  • 0
    Guru 47900 points

    Does a "cop" have a gun?

    Very recent (i.e. today) posts to this exact issue abound.

    Admittedly - the Tiva Product Selector Guide - which details/explains - remains "hidden" - but most all TM4C do...

  • 0
    Guru 27665 points
    Clearly yes, since we are having a discussion about it.

    If you mean do all TM4C variants have hardware support for Quadrature decoding, that is what selection tables are for

    www.ti.com/.../products.page

    That shows 37/71 variants have QEI interface.

    If you mean is it possible to do quadrature decoding on any TM4C variant, then again the answer is trivially yes. It depends on how fast you need the interface to be. Mind you the same is true of the hardware interface, it's just that the hardware tops out at higher frequencies.

    Robert
  • 0 in reply to Robert Adsett
    TI__Mastermind 40660 points
    Thanks for the help, I saw the QEI discussion and was aware of it, but was not aware that it could decode as well. I'm not very familiar at all with QE at all. Thanks both for the help!

    Evan
  • 0 in reply to Evan W
    Guru 47900 points

    The QEI section w/in the MCU manual details - and there's much general info on the web.    QEI provides a well known and robust means to capture speed & direction information. (and sometimes, position)

    The decode process is a bit tricky - having that all "on-board the MCU" greatly speeds/eases client-user mastery...

  • 0 in reply to Evan W
    Guru 27665 points
    The module is perhaps misnamed, AFAIK it only does decoding. It is an interface to a quadrature encoder thus Quadrature Encoder Interface.

    Another entry for the divided by a common language file.

    Robert
  • 0 in reply to Robert Adsett
    Guru 47900 points

    @Robert,

    Could we (possibly) better sync our clocks?    (1st postings 1 min apart - last ones "on the button.")

  • 0 in reply to cb1
    Guru 27665 points

    cb1- said:

    @Robert,

    Could we (possibly) better sync our clocks?    (1st postings 1 min apart - last ones "on the button.")

    I suggest an optical timing cable.

    Robert

  • 0 in reply to Robert Adsett
    Guru 47900 points

    Robert Adsett said:
    I suggest an optical timing cable.

    Likely 3 channel capable (Ph A, Ph B, Index) and then split out - routed to which MCU peripheral?