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August 18, 2026
Question

STM32H755ZI-Q: LAN8742,problem with ping after dhcp server gives ip address to the nucleo-board.All set-up made by example for STM32H745ZI-Q

  • August 18, 2026
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Hi
I am trying to make simple setup for H755ZI-Q nucleo-board with ETH + LWIP + RTOS. I was using  this Forum Section as the source of example that i used (H745ZI-Q) that is by all documents have same characteristics as my board and compatible with it . 

So back to the Problem, my board doesn^t respond to ping that i send even when the dhcp server that i started on my PC gives me that the board on this “IP-address” . After what the ping don^t  go through.  I added a breakpoint to "void ETH_IRQHandler(void)". After the initial power-on, the system reaches the breakpoint three times even when there is no ping command on the Ethernet port. Can u please help me with that?

I tried to reconfigure everything from flash memory , turn off the Cache to check if that change anything , I have even Hybrid of RTOS + Raw Api ETH + LWIP that works. I could not understand is smth wrong with my board or with code that generates cause in Documents everything sounded simplier. 
 
My Project (Main Files)

Exam
ple that was used as Reference