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Vbus Detection

Question asked by xol.xol on Feb 28, 2013
Latest reply on Mar 1, 2013 by xol.xol
I'm developing a self powered USB FS Peripheral Only Device. To detect a USB cable connection to Host I assume to use 
SRQINT bit in OTG_FS_GINTST register.

But for some reason I can not initially clear this bit. I wrote a "1" init it to no avail. 
The VBUS level is about 0.8V measured on PA9 (STM32F20xx).

I played with GCCFG_VBUSBSEN and GCCFG_VBUSASEN it also did not help.
What's wrong?