The OTG_HS port on STM32F4 SoCs can support both full-speed USB transmission with its integrated transceiver at 12Mbps, and high-speed USB transmission at 480Mbps with the external USB phy. So, the pins PB14 and PB15 from OTG_HS port can be directly used as a full-speed USB interface, providing same functionality as the OTG_FS port from PINs PA11 and PA12. To support OTG_HS as a full-speed USB port, the device driver usb_dc_stm32 needs to be changed to use the corresponding registers for OTG_HS port.
The OTG_HS port on STM32F4 SoCs can support both full-speed USB transmission with its integrated transceiver at 12Mbps, and high-speed USB transmission at 480Mbps with the external USB phy. So, the pins PB14 and PB15 from OTG_HS port can be directly used as a full-speed USB interface, providing same functionality as the OTG_FS port from PINs PA11 and PA12. To support OTG_HS as a full-speed USB port, the device driver usb_dc_stm32 needs to be changed to use the corresponding registers for OTG_HS port.