QUERY · ISSUE

NUCLEO_F746ZG LAN stops working after few days.

openby schefopened 2024-07-29updated 2026-03-24

bugport-stm32

Port, board and/or hardware

NUCLEO_F746ZG

MicroPython version

Micropython v1.17

Reproduction

Just using it for a while.

Expected behaviour

To continue communicating.

Observed behaviour

This happens randomly. It can happen after 1 day or after 20 days. The code continues to work.

Additional Information

Micropython stops communicating with the LAN chip. I have no way of resetting the chip. I tried to reactivate the LAN driver. I also tried extending the C part of the LAN driver and look at the registers but did not find a solution there. Resetting the micropython solves the issue. I guess the LAN chip also gets a reset. Is there anything i can test or extend to find out what the issue is and how to fix it. Thanks.

Code of Conduct

Yes, I agree

CANDIDATE · ISSUE

network.LAN on NUCLEO_F429ZI

closedby MichaelAkhnoukhopened 2019-08-19updated 2019-09-11

port-stm32

i'm having the same issue presented in this thread
https://forum.micropython.org/viewtopic.php?f=12&t=6804

the REPL crashes whenever network.LAN() instance is created

Assessment

Q Qwen · medium

Both issues concern Ethernet/LAN problems on STM32 NUCLEO boards (F746ZG vs F429ZI). However, they describe different symptoms: Issue #15568 reports the LAN stopping randomly after days of operation (runtime failure), while Issue #5022 reports a REPL crash during LAN instance creation (initialization failure). These are distinct failure modes with potentially different root causes. While they share the same component (stm32/network) and hardware family, the candidate does not resolve the query's specific problem of intermittent runtime failure.

Suggested action

Keep both issues open. The candidate provides context about LAN issues on STM32 but does not address the specific intermittent runtime failure described in the query. Consider linking the issues for cross-reference if similar underlying causes are discovered.