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STM32F405RG USB FS unexpected Interrupt

Question asked by Vix.Martin on Jun 17, 2013
Latest reply on Jun 18, 2013 by Chinzei.Tsuneo
I build my own STM32F405RG Stamp and try now to get the USB FS running. For to make good progress I use the libraries, which are available for the stm32F407 Discovery.
I use Atollic True Studio Lite and ST-Link/V2 SWD.
When I debug the USB example then I get a unexpected Interrupt and the program execution hangs in a endlos loop. The Equipment Manager in Windows shows that a new USB is connected but with problem uknown. When I stop the debug seccsion, then the equipment manager shwos a working USB "STM Device in DFU Mode".

It is sure there is a problem.

Is theis problem knowing or how can I debug this problem.