STM32H747IIT6 ETHERNET RMII PROBLEM

[KAnahar]

Hello,

I am using the STM32H747IIT6 microcontroller along with the LAN8742A Ethernet PHY, configured in RMII mode. However, I am facing issues where the Ethernet interface is not working at all in my circuit. It appears there may be multiple bugs or configuration issues affecting the RMII driver.

I suspect there are underlying bugs in the RMII driver implementation. I would appreciate any advice or suggestions on how to resolve these issues and get the Ethernet interface up and running as soon as possible.

[mbarg.1]

Buy a demo board - download an example in STM32CubeIde - check what ia wrong in your setup/design...

Demo can be not ready for prime time, but they do ALWAYS basic functions

[mƎALLEm]

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@KAnahar wrote:

I suspect there are underlying bugs in the RMII driver implementation. 

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Hello,

Why it's the case? it could be a hardware issue.

As said by @mbarg.1 , buy NUCLEO-H755ZI-Q board. It's using LAN8742A PHY. Adapt your code on this board and run it. Here you can differentiate if it's a HW or software issue. 

[KAnahar]

I have STM32H7I-DISCO board. LAN8742A schematic fully same with development board. This is not my first PCB design, I don't think so this is hardware issue. I'm looking for a detailed, step-by-step guide that outlines the key points to consider during project configuration. I've noticed that many users, including myself, are experiencing difficulties running the Ethernet LwIP stack on the STM32H7 series.

[mƎALLEm]

This is an article that describes a step by step Ethernet/LWIP project creation on STM32H7 MCUs.