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GPIO/CAN Pins on ZedBoard

Former Member

Please forgive me if this question has already been answered elsewhere.  I have a ZedBoard on which I am developing, and I require integration with a CAN bus.  The ZedBoard does not appear to break out the CAN bus.

I have, however, seen several posts on this forum about operating the CAN bus on a ZedBoard.  Some people seem to have been operating CAN over GPIO pins.

Are there any exposed CAN pins?  Are there any exposed GPIO pins that can be used to implement CAN over GPIO?

Thanks

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    There are two ways to 'expose' the CAN bus signals from either of the Zynq CAN controllers. Once you enable one of the CAN controllers in the Zynq PS (Processing System) you can select the I/O to be connected to a selection of specific MIO pins or connect the CAN I/O to EMIO into the Zynq PL (Programmable Logic) section and then onto PL I/O pins.

     

    Several pairs of allowable MIO signals for either of the CAN controllers are connected to the JE PMOD connector on the ZedBoard.

     

    -Gary

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    There are two ways to 'expose' the CAN bus signals from either of the Zynq CAN controllers. Once you enable one of the CAN controllers in the Zynq PS (Processing System) you can select the I/O to be connected to a selection of specific MIO pins or connect the CAN I/O to EMIO into the Zynq PL (Programmable Logic) section and then onto PL I/O pins.

     

    Several pairs of allowable MIO signals for either of the CAN controllers are connected to the JE PMOD connector on the ZedBoard.

     

    -Gary

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  • 0 in reply to Former Member

    Gary,

    Thank you for the reply.  Using the schematic and the technical reference manual, I was able to wire a level-shifted CAN transceiver to MIO pins 14&15.

    The big mystery at this point, becomes the nuts-and-bolts mechanics of assigning MIO pins to the CAN controller.  I am running the ubuntu based Linux distro provided by Xilinx, but have been unable to locate any documentation regarding which binaries will report the status of things like the MIO pins, which /proc entries do I tickle to connect them, etc.

    Are you aware of any documentation that can help me get a sense for how to do things with my zynq using the command-line?

    Thanks again,
    Harrison