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Problem with Ethernet connection (STM32F417 + LwIP + LAN8720)

Question asked by Thomas K on Aug 28, 2017


I am building a system with ethernet on a STM32F417. When I connect the circuit to my PC directly, the connection is established  successfully when my ethernet cable has no ground connected to the shield. When I connect it with a cable where the shield is connected, the connection can not be established, both Ethernet LEDs are constantly on.

When I connect it to a switch, there is a similar problem. Independent of the cable, the LEDs are constantly on and no connection to the network is possible. 

Has anybody an idea?


Best regards