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

Dominik Fischer

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: DP83869

Tool/software:

Hello TI-Team,

maybe a trivial question, but is there any possibility in MCU+ SDK to read/write PHY registers for configuration. I am using a DP83869 on a custom board and want to set the auto negotiation to enabled. I am actually playing around with the simple enet_lwip_cpsw_am243x-evm_r5fss0-0_freertos_ti-arm-clang example.

I came accross the ETHPHY API but I am unsure about how to use this/where to get the necessary configuration from. In a simple test I did the following (which I know looks wrong, but I had no idea how to fill mdioBaseAddress and the attributes correctly). Shouldn't gEthPhyConfigNum and gEthPhyConfig be somewhere auto-generated?

ETHPHY_Config gEthPhyConfig[1];
uint32_t gEthPhyConfigNum = sizeof(gEthPhyConfig) / sizeof(ETHPHY_Config);

void debug()
{
    static ETHPHY_Params params;
    static ETHPHY_Attrs attributes;
    attributes.mdioBaseAddress = 0;
    attributes.phyAddress = 0;

    gEthPhyConfig->fxns = &gEthPhyFxns_DP83869;
    gEthPhyConfig->attrs = &attributes;

    ETHPHY_Handle handle = ETHPHY_open(CONFIG_ENET_CPSW0, &params);
    uint32_t value = ETHPHY_SPEED_DUPLEX_CONFIG_AUTONEG;
    int32_t status = ETHPHY_command(handle, ETHPHY_CMD_SET_SPEED_AND_DUPLEX_CONFIG, (void *)&value, sizeof(value));
}

How can I successfully use ETHPHY_command? Is there any other possibility to read/write PHY registers easily? I stumbled accross EnetPhy_writeReg also, but I do not know how to propagate/extract a EnetPhy_Handle correctly up to user application.

Thanks a lot for any hint!

6 months ago

0 Ashwani Goel 5 months ago

TI__Mastermind 25560 points

Hi Dominik Fischer,

Thanks for your query.

I will check oin this and get back to you.

Regards

Ashwani

0 Dominik Fischer 5 months ago in reply to Ashwani Goel

Intellectual 480 points

Hi Ashwani,

anything new on this topic?

0 Ashwani Goel 5 months ago in reply to Dominik Fischer

TI__Mastermind 25560 points

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

0 Ashwani Goel 4 months ago in reply to Ashwani Goel

TI__Mastermind 25560 points

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

0 Dominik Fischer 4 months ago in reply to Ashwani Goel

Intellectual 480 points

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

0 Ashwani Goel 4 months ago in reply to Dominik Fischer

TI__Mastermind 25560 points

Thanks Dominik for update.

Waiting for your test results.

Regards

Ashwani

0 Dominik Fischer 4 months ago in reply to Ashwani Goel

Intellectual 480 points

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!

0 Ashwani Goel 4 months ago in reply to Dominik Fischer

TI__Mastermind 25560 points

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

0 Dominik Fischer 4 months ago in reply to Ashwani Goel

Intellectual 480 points

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.

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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 */
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

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;

0 Ashwani Goel 4 months ago

TI__Mastermind 25560 points

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

0 Dominik Fischer 4 months ago in reply to Ashwani Goel

Intellectual 480 points

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

0 Ashwani Goel 3 months ago in reply to Dominik Fischer

TI__Mastermind 25560 points

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

Arm-based microcontrollers

Arm-based microcontrollers forum

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