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IND-COMMS-SDK: How to avoid stacking in MDIO read or write section

Tomoya Oyama
Intellectual 330 points
Part Number: IND-COMMS-SDK
Other Parts Discussed in Thread: AM2432, , DP83869

Tool/software:

Hi team,

I develop EtherCAT slave application of IND-COMMS-SDK for AM243x, with AM2432 + dp83822.

I am experiencing a loop or stuck state when reading MDIO for the first time.

I believe this is a hardware issue (unstable voltage on MDIO),

but is it possible to reset the PHY  when it gets stuck?

Best regard,

Oyama

  • 0
    TI__Genius 9195 points

    Hi,

    Tomoya Oyama said:
    I am experiencing a loop or stuck state when reading MDIO for the first time.
    • Are you reading using the MDIO APIs? Where is it getting stuck? Is the PHY up when the MDIO tried to read (at least PHY registers coming up)?
    Tomoya Oyama said:
    but is it possible to reset the PHY  when it gets stuck?
    • Yes this is possible. You can toggle the GPIO pin connected to the PHY Reset pin and check PHY Register BMCR via MDIO to ensure it's ready after reset.

    If you could give more details on the issue you're seeing, I can cross-check for the same from my side.

    Regards,
    Aaron

  • 0 in reply to Aaron Thomas
    Intellectual 330 points

    Hi Aaron,

    Freezing does not occur often, and MDIO will recover within tens of seconds.

    The freeze occurs when CUST_PHY_readReg() or CUST_PHY_writeReg() is called early in CUST_PHY_dp83869.c.

    (In fact, the contents of CUST_PHY_dp83869.c have been rewritten for the dp83822.)

    When the program is frozen, if I connect JTAG, it always stops at the following function.

    This is in a library, so the exact location is unknown.

    The cause of MDIO instability is unknown for now.

    Best regard,

    Oyama

  • 0 in reply to Tomoya Oyama
    TI__Intellectual 2890 points

    Hello Oyama,

    Tomoya Oyama said:
    Freezing does not occur often, and MDIO will recover within tens of seconds.

    Is that the program starts (MDIO_phyRegWrite / MDIO_phyRegRead function returns) to work again after tens of seconds?

    Tomoya Oyama said:
    The freeze occurs when CUST_PHY_readReg() or CUST_PHY_writeReg() is called early in CUST_PHY_dp83869.c.

    What exactly you mean 'early' called?

    Did you try resetting or power down the PHY? 

    Kind Regards,

  • 0 in reply to Harsha Begihally Shanmukhaswamy
    Intellectual 330 points

    Hi Harsha,

    Harsha Begihally Shanmukhaswamy said:
    Is that the program starts (MDIO_phyRegWrite / MDIO_phyRegRead function returns) to work again after tens of seconds?

    "Freezing" means that the program goes into the while() loop and doesn't get out of the while() loop for a long time.

    Harsha Begihally Shanmukhaswamy said:
    What exactly you mean 'early' called?

    The exact location of the freeze is unknown. Once the program is out of the freeze state, it will not freeze again.

    Best regard,

    Oyama