MCU-PLUS-SDK-AM243X: How to read/write/modify Ethernet PHY registers of DP83869

Hi Dominik Fischer,

Thanks for your query.

I will check oin this and get back to you.

Regards

Ashwani

Hi Ashwani,

anything new on this topic?

Hi Dominik Fischer ,

I was on vacation last week.

So could not check on this.

Will get back to you by next week.

Regards

Ashwani

Hi Dominik Fischer ,

Thanks for having patience for such a long time.

Dominik Fischer said:

I came accross the ETHPHY API but I am unsure about how to use this/where to get the necessary configuration from.

Can you refer below APIs instead of this and let me know if you need further help?

https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/10_00_00_20/exports/docs/api_guide_am64x/group__DRV__ENETPHY.html

Regards

Ashwani

Hi Ashwani,

I currently moved to other topics and still was not able to test your suggestion, hopefully I get back to you next week.

Thanks and Kind regards,

Dominik

Thanks Dominik for update.

Waiting for your test results.

Regards

Ashwani

Hi Ashwani,

I tried to get it running, but I am still not fully understanding how I could use this API in my application. I started again with the enet_lwip_cpsw_am243x-evm_r5fss0-0_freertos_ti-arm-clang example.

- I need access to EnetPhy_Handle for all API-functions mentioned here: https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/10_00_00_20/exports/docs/api_guide_am64x/group__DRV__ENETPHY.html
- EnetPhy_Handle seems to be filled in EnetPhy_open(...)
- this is all done automatically when EnetApp_driverOpen(...) is executed
- the EnetPhy_Handle seems to be stored in Cpsw_Handle, which is a reinterpreted EnetPer_Handle
- EnetPer_Handle finally is found in the gEnetAppSysCfgObj autogenerated by syscfg in ti_enet_open_close.c

The problem is this is a static variable in a autogenerated file, but I have no funciton for accessing the gEnetAppSysCfgObj and therefore to access the EnetPhy_Handle, which is stored somewhere inside there.

Could you please clarify how this can be used in normal user applications e.g. integrating in test_enet.c of example?How can/should I access EnetPhy_Handle?

Am I approaching this incorrectly?
Maybe you have a short standalone example how to use this? Maybe I lack some understanding of TI Ethernet driver...

Thanks!

Hi Dominik Fischer,

Can you look for typedef struct EnetPhy_Obj_s in "\mcu_plus_sdk_am243x_10_00_00_20\source\"

/*!
* \brief PHY driver object handle.
*
* PHY driver opaque handle used to call any PHY related APIs.
*/
typedef struct EnetPhy_Obj_s *EnetPhy_Handle;

Regards

Ashwani

Sure I can take a look at the struct, but this doesn't really help me. I think filling this manually is not the solution as it needs to be done by driver? I do not know how to fill all those properties correctly. That's why I wanted to use the already existing valid handle filled and configured from the driver.

typedef struct EnetPhy_Obj_s
{
    /*! MDIO handle used to access PHY registers */
    EnetPhy_MdioHandle hMdio;
    /*! PHY configuration params */
    EnetPhy_Cfg phyCfg;
    /*! MII interface type */
    EnetPhy_Mii mii;
    /*! MAC port supported capabilities */
    uint32_t macCaps;
    /*! Port Link configuration (speed, duplexity) */
    EnetPhy_LinkCfg linkCfg;
    /*! State-machine timeout configuration */
    EnetPhy_FsmTimeoutCfg timeoutCfg;
    /*! State-machine state */
    EnetPhy_State state;
    /*! PHY group */
    uint32_t group;
    /*! PHY device address */
    uint32_t addr;
    /*! Requested link capability mask */
    uint32_t reqLinkCaps;
    /*! PHY driver */
    EnetPhyDrv_Handle hDrv;
    /*! Magic number indicating that this object is in use */
    EnetPhy_Magic magic;
    /*! Caller-provided arguments to be used in MDIO driver calls */
    void *mdioArgs;
} EnetPhy_Obj;

Dominik Fischer said:

I am using a DP83869 on a custom board

I am looking into this with assumption that you are referring below documentation?

Custom Board Support

AM64x MCU+ SDK: Ethernet PHY Link Configuration

May I know, why do you want to change PHY settings from application ?

Regards

Ashwani

Hi Ashwani,

Yes, I provided a `enet_cutom_board_config.c` file.

The reason is simple, as I had this issues with 1Gbps connection my intention was to set it fixed to 100 Mbps as temporary workaround.

e2e.ti.com/.../mcu-plus-sdk-am243x-lwip-cpsw-example-not-working-for-1-gbps-connection

Dominik Fischer said:

The reason is simple, as I had this issues with 1Gbps connection my intention was to set it fixed to 100 Mbps as temporary workaround

I will check on this and get back to you.

Regards

Ashwani