Posted on May 17, 2011 at 14:25We considered using the LAN8720, too. This is what I found out some months ago:
No changes will be needed in lwIP itself, only some minor modifications in STM32_ETH.c/.h will be needed. For example, the address of the status register is different for the 8720 (reading this register is important to get negotioted link speed). There are already some uncommented defines for the LAN8700 in the header file, at first look they seemed to be correct for the 8720, too.
All in all I do not think that it will be very difficult to get the LAN8720 working. But I have to admit that we finally decided to stay with the DP83848 and the LAN8270 never found its place on the board. So it could be possible that I overlooked something...
