MCU-PLUS-SDK-AM243X: DP83826E LEDCFG Register Errata leading to incorrect ethphy_dp83826e.c

Steve Squires

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: DP83826E, DP83826I

Tool/software:

I think I am having the same issue as the one mentioned here: MCU-PLUS-SDK-AM243X: DP83826E-driver does not set LED2 as needed. - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

I am not able to change the behaviour of LED2 using the AM243X SDK (ethphy_dp83826e.c) which is, apparently, still referring to the wrong register offset as per the latest dp83826i.pdf datasheet (SNLS647G – DECEMBER 2019 – REVISED JULY 2023). It seems that the datasheet has not yet been updated and hence the SDK (ind_comms_sdk_am243x_09_02_00_15) is still wrong too.

Please kindly confirm whether or not the datasheet for LEDCFG (0x460) is correct. Thank you.

Additionally, the SDK's ethphy_dp83826e.c driver does not provide a method for addressing the LEDCFG2 (0x496) register to control the LED polarity. Please kindly add this support so that I can remove my own work-arount code to do this.

Thanks,

Steve

6 months ago

0 Nitika Verma 6 months ago

TI__Expert 7385 points

Hi Steve,

Which example from the ind_comms_sdk are you working with?

Regards,

Nitika

0 Steve Squires 6 months ago in reply to Nitika Verma

Intellectual 545 points

Hi Nitika,

I am working on code based on the TI implementation of the Beckhoff SCC example.

We are using the DP83826E Phy which needs 'custom' support (I am working with a modified tiescsoc.c file).

But that's not really the issue - it's about whether or not dp83826i.pdf is correct (I suspect not). Can you confirm?

Thanks, Steve

0 Aaron Thomas 6 months ago in reply to Steve Squires

TI__Expert 8965 points

Hi Steve,

I'll look into the issue you have reported. Please expect a reply by Friday due to other priorities.

Regards,
Aaron

0 Steve Squires 6 months ago in reply to Aaron Thomas

Intellectual 545 points

Hi Aaron,

I found other reports of this error on E2E from 2 years ago:

DP83826I: Differences between datasheet and actual equipment for LEDCFG Register . - Interface forum - Interface - TI E2E support forums

and here:

DP83826I: Datasheet errata + transformerless operation - Interface forum - Interface - TI E2E support forums

I am also seeing some strange behaviour with bit 7 on register 0x18 leading to cross-wire reports from MainDevice. Any know errata here?

Please kindly update the datasheet (and dependent SDKs) as soon as possible.

Thanks, Steve

0 Aaron Thomas 6 months ago in reply to Steve Squires

TI__Expert 8965 points

Thank you Steve for the details. We'll analyze it and get back.

Regards,
Aaron

0 Evan Mayhew 6 months ago in reply to Aaron Thomas

TI__Mastermind 24988 points

Hi Steve,

I've confirmed this LEDCFG is incorrect in current datasheet revision. Datasheet revision is in progress, please expect this to be updated by early Q2.

Steve Squires said:
I am also seeing some strange behaviour with bit 7 on register 0x18 leading to cross-wire reports from MainDevice. Any know errata here?

Can you help me understand the issue regarding this bit? I see this is LED Link polarity, are you seeing behavior contradicting the description?

Thank you,

Evan