2017-08-25 10:43 AM
More.
Both L4 and F4 Cube use USBx_DEVICE->DOUTEP1MSK and USBx_DEVICE->DINEP1MSK, while neither of the RMs mentions them.
Oh yes I do suspect these are related to OTG_HS_EP1_IN/OTG_HS_EP1_OUT interrupts, but these are just mentioned by name in RM0090 without any further explanation...