from stm32f446xx.h:856
typedef struct
{
__IO uint32_t DIEPCTL;
uint32_t Reserved04;
__IO uint32_t DIEPINT;
uint32_t Reserved0C;
__IO uint32_t DIEPTSIZ;
__IO uint32_t DIEPDMA;
__IO uint32_t DTXFSTS;
uint32_t Reserved18;
} USB_OTG_INEndpointTypeDef;