STM32F207VC - Ethernet with LwIP works after flashing but not any more after power supply is set off and on again
Hello all,
I have a strange behavior with the ethernet connection of my STM32F207 application:
When I flash the software to the controller the software works. I can ping the controller, I can communicate with a client software to the serversoftware on the controller without problems. When I disconnect and reconnect the power supply I suddenly can´t communicate anymore. I don´t think that it is something software related because it works right after flashing.
I have flashed my programm with atollic true studio in debugger mode and with ST-Link-utility both with the same experience as mentioned above. I am flashing my custom board via a nucleo and even after I disconnect the Nucleo my application works as long as I don´t reset the power supply.
My hardwaresettings for ethernet are the default RMII pins on STM32F207() and for the flashing and debugging the swdio (PA13,PA14,NRST). I have quite some other pins in usage but they all work the same before and after only the ethernet does not work right. Maybe one other thing might be important: I don´t have an external timer quartz on my board but I don´t think, that is the problem because, again, why should it work when im communicating after flashing but not work anymore after i reset the power supply.
I believe the flashing sets some pin to another state permanently until the power supply is resetted but I haven´t figured it out yet. Maybe someone has an idea? Or had the same problem and a solution?
thanks in advance