Use both USB-OTG-HS and USB-OTG-FS as serial devices with custom STM32F446RCTx

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Like the title says, I am looking for a way to use both the USB-OTG’s available on the STM32 as basic serial devices. I have tried using both BufferedSerial which threw an invalid pin error and USBSerial but as far as I can tell USBSerial does not allow for multiple instances.

Any ideas would be greatly appreciated

Thanks,
Ethan