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STM32F7 Ehternert port

Question asked by devcal on Aug 31, 2016
Latest reply on Sep 7, 2016 by devcal


I have a custom board with Ethernet using the STM32F4 and the KSZ8051RNL Phy from Micrel working in RMII mode.
The firmware is based on the LWIP TCP server example from the std. periphery library using a raw communication.
I have been using this design in other boards with success. Everything works perfectly.

Now Im trying to port this code to the same board but with the STM32F7.
I just copied the code since I thought that the ethernet Periphery is the same.

In principle it works. I got an IP from the DHCP server, the netbiosname works, I can ping the board. My problem is that when I send a data request to the controller, the answer does not leave until I send a couple of request. As if a minimum buffer size must be filled or something similar.

Does any one have any idea what could be happening here?
Is any register different in the F7? or I am missing one?