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Last Post 04 Aug 2005 07:18 PM by  jkinross
CAN Bus not working
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Ewald.Mack
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22 Jul 2005 06:37 AM
    Hello,

    we have the M548x EVB LITE / REV-A with Metroworks Linux 2.6. Presently we are testing the CAN implementing (CAN4Linux) on this board and have many problems. If we send a can frame on CAN1 (CAN0 is not connected on the development board), we see some signals on an oszilloscope, but it's not really a CAN frame (also we get a bus error on a parallel connected CAN analyser).

    Did anybody here get the CAN controller working ? What software (OS) and what hardware do you use (REV-???) ? Are there known hardware / software bugs ?

    regards
    ericn@logicpd.com
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    02 Aug 2005 11:56 AM
    I cannot comment on Metroworks, but I have used the CAN on the coldfire board. I used it in a loopback configuration sending packets back and forth between the two can ports. This was without any OS.

    I found a note in the freescale errata document (section 5.1). http://www.freescale.com/...errata/MCF5485DE.pdf
    Could this have anything to do with what you are seeing??

    Eric N
    jkinross
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    04 Aug 2005 07:18 PM
    I am seeing a very similar problem on the 5485 EVB with Metrowerks and ARC. CAN0 works fine but CAN1 does not.

    I have a simple loopback test which came with the OS. It works fine if run with the BDM, it works fine if run from the boot flash. If run from the user flash it stops working.

    Running from the user flash:
    If CAN0 transmits while CAN1 receives then I see the CAN data on the bus with a CAN analyzer but CAN1 does not see the data.

    If CAN1 transmits while CAN0 receives then the CAN analyzer shows nothing but bus errors.

    The CAN registers and I/O is configured the same in all of the above situations.
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