[lwip-users] STM32F7 HAL issues

[Sachs, Nico]

Hi,
I know there were or are a lot of issues around stm32 ethernet  STM HAL / 
etherenetif from CubeMX etc.. which can be found on the st community or 
discussed here. 
I try to reopen this conversion, since anything which I found won't solve my 
issue. 

Issue: I run the http example from contrib on lwip 2.1.2. FS from example, and 
generated my file using makefsdata. So, If I now open the website, I get 
somewhere a frame which previous segment was not captured, resulting in some 
delays/timeouts on the full website load. 

I had hope that this which I found here 
https://community.st.com/s/question/0D50X00009XkgffSAB/stm32f746-ethernet-dma-transmit-problem
 would help on the issue, but including the memory barrier instruction wont 
help. But if I include some Delay before HAL_ETH_TransmitFrame(&heth, 
framelength); it works like a charm. 

So it has something to do with the descriptors, but I can't figure it out how 
to solve it. And I don't want to leave that delay in there.  

Is, there anybody out there who had similar issues?

Cheers