STM32F7 ethernet issues in RMII mode

[Mairo Leier]

Posted on December 10, 2017 at 11:15

I have a STM32F767 and STM32F746 nucleo dev kits. Both seems to be 'Z' models.

I developed RTOS based TCP server based on netconn that receives and transmits data over ethernet. STM does not answer to the ping nor sending/receiving any data. On the ethernet plug both green and yello LEDs are on. Problem is that after several restarts ethernet starts working until the next restart, if I am lucky. I have noticed that eth works only when green LED is off on the ethernet plug.

At first I thought problem is on my SW side. I developed similar server using RAW sockets, then tried with UDP client - same issues.

At first I tried with STM32F767 but then replaced it with STM32F746 just for testing purposes - still same issues.

Reading errata sheets I saw similar problems but looks like that they should all be fixed with 'Z' model.

From the dev board schematic (

http://www.st.com/content/ccc/resource/technical/document/user_manual/group0/26/49/90/2e/33/0d/4a/da/DM00244518/files/DM00244518.pdf/jcr:content/translations/en.DM00244518.pdf

) I have disconnected jumper SB177 not to reset ETH controller after STM restarts. If I reset manually my ETH controller from the same jumper so that green LED stays off then I can do whatever with my STM (reprogram,...) then ethernet remains functional.

To me it looks like the same issue as here which should be fixed now.

Currently, whatever I develop with my ethernet based nucleos I hit all the time with same issue. Any ideas?

#nucleo-f746 #ethernet #rmii #nucleo-f767zi

[Mairo Leier]

Posted on December 15, 2017 at 15:03

Looks like no one has had similar issues?

As we are designing custom PCB currently the only option is to switch to the MII interface and replace the PHY chip.

[Mairo Leier]

Posted on December 19, 2017 at 10:21

Guys, I am really in trouble

Let's try to make it simple. Has anyone tried some ethernet project from ST that works out of the box with STM32F767-nucleo (STM32F767ZIT6U)? If yes then point to that project and I will try it.

My bet is that this RMII mode PHY chip sucks that makes those ethernet boards useless. I am still resetting manually my PHY chip with soldered wire to start it 'at the correct clock edge'.

[yMont]

Well... trying to run ethernet on this board is being a nightmare. Except in mbed, no one could make this works. I can't find any example/application working too.

[flast.161]

Where have you soldered your wire?

[Piranha]

Folks, try this one:

https://community.st.com/s/question/0D50X0000AhNBoWSQW/actually-working-stm32-ethernet-and-lwip-demonstration-firmware

[Joerg Wagner]

What does this mean?

Both seems to be 'Z' models.

Take a look on the die, is there an 'A' or a 'Z'?

Please provide project files to check your problem. We don't know your firmware release, etc..

I have many boards in production without any issue.