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RTOS/PROCESSOR-SDK-AM335X: Accessing MDIO interface for Ethernet testing

Han Hoekstra
Prodigy 230 points
Part Number: PROCESSOR-SDK-AM335X

Tool/software: TI-RTOS

Hello,

I am looking at accessing the MDIO interface of the normal (non-PRU) Ethernet interface for bringing it into test mode, but I am unable to find how to do this.

I have seen there are MDIO related functions in CSL_MDIO.H, but this header file does not contain anything for the AM335x.

The libraries I use are PDK_AM335x_1_0_12 and NDK_3_40_01_01.

We need to put the Ethernet PHY into ttest mode, so that we can measure the performance of the PHY on a custom board we are developping at the moment. I have found this document (http://www.ti.com/lit/an/snla239a/snla239a.pdf) explaining how to configure a PHY for test mode, but I don't know how to access the PHY registers vis MDIO.

Could someone please point me in the right direction ?

  • 0
    TI__Guru* 95265 points
    Hi,

    The PHY is accessed via the MDIO. You can find those example code under pdk_am335x_1_0_12\packages\ti\board\src\<AM335x board name>\device\enet_phy.c.

    Regards, Eric
  • 0 in reply to lding
    Prodigy 230 points
    Thanks a lot..
    That is ofcourse a good place to look !!
    I have successfully used that code in my application and can now access the MDIO registers.

    Thanks, Han