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Two TM4C1294 Connected Launch Pads communication over Ethernet cable

Djedjica
Intellectual 870 points


Hello everyone, 

Are there any examples or some instructions for connecting two lounchpads with ethernet cable in between, and get two of them to communicate over that cable. Thank you in advance! 

Kind regards!

  • 0
    TI__Guru**** 244440 points
    Hello Djedica,

    Not really. But with Auto MDIX it is possible for the PHY to resolve a straight or cross over cable.

    Regards
    Amit
  • 0
    Guru 117855 points

    While there may be some advantage to, "Connecting 2 separated MCU boards" via ethernet - as Amit notes - a "degree of difficulty" penalty arises.

    As these MCUs have multiple, far simpler, serial channels: (CAN, UART, SPI, I2C) your selection of one of these may make more sense.

    Should distance be a concern RS232/485 (w/UART) or CAN Xcvrs can provide robust signals - even when MCUs are well separated.

  • 0 in reply to cb1_mobile
    TI__Guru**** 244440 points
    Hello cb1,

    Indeed simpler protocol exist over simple serial channels...

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Intellectual 870 points

    Yes, but we are interested in using this cable, since it is cheaper and easier to implement in labs. It is a little hard for me to belive that this is something what is not used at all.

  • 0 in reply to Djedjica
    Guru 117855 points

    Djedjica said:
    since it is [ethernet] cheaper and easier to implement in labs

    You don't really believe that - do you?     Other than your undocumented assertion - you've offered no supporting justification...

    Cheaper - the cost & size demanded by ethernet connector, transformer etc. - is that cheap?

    Easier to implement - if so - why are "you" here - asking?   Note that few have asked, "How to implement RS485 connections."

    Multi-drop RS485 - far more likely -  meets your (expressed) needs of, "cheap & easy."

  • 0 in reply to Djedjica
    TI__Guru**** 244440 points
    Hello Djedjica,

    Note that you are connecting two boards in a P2P mode. If doing n/w, yes, if P2P no. The cost of a 232 Level Shifter and cable assembly would be lesser than the cost of ESD, magnetic, socket and cable on Ethernet.

    Regards
    Amit