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CAN FD — Parallax Forums

CAN FD

David BetzDavid Betz Posts: 14,516
in Propeller 1

Has anyone implemented the CAN FD protocol on the P1 (or P2)? If so, how fast can it go?

Comments

  • ChrisGaddChrisGadd Posts: 310
    edited 2024-07-10 19:29

    I was working on the FD protocol on the P2 a few years ago before I got distracted with something else. I managed to get it somewhat working up to 5Mbps with a 320MHz clock, though I there were issues with certain combinations of nominal and data bitrates and clkfreqs.

    I wouldn't count on the P1 to be able to handle it at all; I barely managed to get a classic CANbus object working at 500Kbps on a single cog, 1Mbps required 2 cogs, and the FD protocol adds a lot of more overhead.

    Best bet would be to use a mcp2517, which I've made drivers for both the P1 and P2.

  • David BetzDavid Betz Posts: 14,516

    Thanks! Is your code available in the OBEX?

  • ChrisGaddChrisGadd Posts: 310

    It is now. https://obex.parallax.com/obex/mcp2517-can-fd-controller-drivers/

  • Beau SchwabeBeau Schwabe Posts: 6,566

    Curious what it was about CANbus that attracts you?

    For us, it was the robustness of the hardware level communication used in the automotive industry.
    Our primary use now is a variation we have adopted for bitcoin and data center communications.

    I once lost a job interview because I did not know how many nodes you could connect to CANbus....
    Since then? ...the company that I work for now... Born out of COVID and supply chain shortages, we have created a variation of CANbus based on an industrial 24V system that can handle 1000 addressable nodes using easy to find off the shelf components at speeds of up to 2Mbps.

  • GenetixGenetix Posts: 1,754

    Beau,

    The medical device I am working with uses CAN for the motor controllers.

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