STM32 Ethernet Problem

[flowchartx]

Good work everyone,
I am communicating with the STM32F746 processor using the lwip library. I got the ethernet buffers in the special area of ​​the RAM and protected it with the MPU. Then I disabled the buffering feature. My code works as I want, but after 10-15 minutes communication is cut off. My grounding, my connections, everything looks good.

[paulca]

Run it in the debugger.   Wait for it to fail.  Pause the execution and see where it's stuck.  Often you'll find it in an error handler loop.

Another common gotcha is forgetting to implement the Error call backs for peripherals.  If you are triggering on interrupts and an error occurs, the peripheral will stop.  You will need to recover and start it back up again in the Error callback.

In the debugger, sanity test things, make sure you are writing to the area you expect and you haven't used Byte length instead of word length.

[peter-h]

MPU? Is this a multi processor system?

I recall some posts on the ST forums about getting stuff to work. Seems very difficult, with various hacks like __DSB being needed.

I've spent months of my life getting a 32F417 working reliably with LWIP
https://www.eevblog.com/forum/microcontrollers/anyone-here-familiar-with-lwip/

[flowchartx]

Thank you for answers.

First of all, I debug. and communication is lost but I didn't get any error message then I close MPU, D-Cache, I-Cache.
Now, i trying all day. I didn't encounter any breakouts so it seems to be fixed

I wonder why this is so?

My system is not multi-processor

[eutectique]

MPU? Is this a multi processor system?

Memory Protection Unit