Hi
Currently USB is not supported. However you may create the custom block following the custom driver block creation workflow.
As device driver development is applicable for all targets, links are provided for other targets. You may refer them and follow similar process to develop for required target.
Another way could be utilising the External code Import blocks: Embedded Coder — Blocks (mathworks.com)
An example for above mentioned method, where System Initialize and Model Source blocks are used to implement HRTIMER peripheral:
Regards
Goutham
