RP2040 as USB-ROM drive

[sergev]

Let me share with you a firmware I created for RP2040-Zero board, based on TinyUSB mass storage example. Contents of Flash memory is exposed to the USB host as read-only disk image. Disk size is 1984 kbytes. I tried FAT12 and ISO9660 filesystems - both work well. Such tiny read-only USB disks can be useful for storing OpenPGP keys, or as collar tags for your cat or dog.

https://github.com/sergev/usb-rom