Configure USB host on Blues Swan (STM32L4+)

[Pedrogmnz]

Is it possible, through the pins in the image, to configure a USB port on the Blue Swan as a USB HOST to, for example, connect a USB keyboard?

[GonzoG]

Yes, you can enable USB host on this board, but there is no support for usb host in STM32duino, so you'll have to do everything by yourself (interface initialization, device recognition, etc).

USB needs only 4 pins: 5V, GND, DP, DM, so just 2 pins from MCU.
If you want to use it in OTG mode (host/guest) you'll need a 3rd pin from MCU to switch modes.

[Pedrogmnz]

So, what would be the most optimal way to connect a USB keyboard?

[GonzoG]

The one that's best for your project.
The simplest one is to setup USB as a host only.