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roberto239955
Visitor II
June 20, 2003
Question

ST90T40 CAN communication problem at startup

  • June 20, 2003
  • 3 replies
  • 852 views
Posted on June 20, 2003 at 11:53

ST90T40 CAN communication problem at startup

    This topic has been closed for replies.

    3 replies

    R
    roberto239955Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:33

    We have a problem with the interface between the uC ST90T40 and the SJA1000 controller:

    - when we switch-on the circuit the first time, the communication between the card and the other equipment through the CAN communications network is right.

    - When we switch-off and switch-on the circuit with a time difference below 2 seconds (aprox.), with some micro controllers the CAN communication is right and with other micro controllers the same function isn’t right.

    The SJA1000 is a CAN communication controller and the uC is the responsible for configuring the SJA1000.

    The SJA1000 is accessed as a memory from uC using P0DR as alternate function:

    Do you know if it's something already known?

    thanks a lot Fiorenz
    R
    romain2399
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:33

    The problem description is not enougth detailled: did you analyze the Port0 bus signals and the SJA1000 signals during a failure compare with a good device ?

    L
    labafile
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:33

    Sir,

    Did you ever find a solution to this difficulty? Sounds like something we just encountered?
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