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USB: After enumeration, In and Out don't generate interrupt

Question asked by Zirconium on May 24, 2015
I am designing an USB device on the STM32L151CB micro-controller. I use the STM32Cube_FW_L1_V1.2.0 USB library.
My device enumerates correctly. I reach the point of sending an receiving data.

I implemented a class layer, but I can't manage to send and receive data to/from the host (a Linux PC with Libusb).
In fact, after investigation I found that after enumeration, whatever are commands sent by the Host, HAL_PCD_IRQHandler(&hpcd_USB_FS) is never called (no interrupt). I checked all USB registers which seem correctly configured. I see that USB GPIO pins are still in RESET state. Is it normal ? I changed their configuration to alternate functions, but it is the same.
I am totally stuck.  Any clue ?
Thanks a lot.