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usb-rom
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RP2040 as read-only USB drive
Download README (.md)
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Download README
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README.md
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usb-rom
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Download (.md)
# RP2040 as read-only USB Flash drive This firmware for [RP2040-Zero board](https://www.waveshare.com/wiki/RP2040-Zero) turns it into a USB mass storage device. Contents of Flash memory is exposed to the USB host as read-only disk image. Disk size is 1984 kbytes. Disk contents is prepared by user in one of two formats: * FAT12 - similar to traditional Flash disks * ISO9660 - much like CD-ROM or DVD-ROM Other formats are possible by user's discretion. The RP2040 firmware is agnostic to the filesystem format. Longevity of the storage depends on a particular Flash chip installed on the board. For Winbond W25Q16JV-IQ it's "more than 20-year data retention", according to the spec. ## Prerequisites Before build, please make sure you have the following components installled: * CMake and ARM cross compiler * [Pico SDK](https://github.com/raspberrypi/pico-sdk) * [Picotool utility](https://github.com/raspberrypi/picotool) ## Build RP2040 firmware make The resulting binary is located in file `build/usb_rom.uf2`. ## Program the firmware into RP2040 board make upload Alternatively: picotool load -f -x build/usb_rom.uf2 After that, you will see a USB device like this: USB-ROM Drive: Version: 1.00 Serial Number: E6625887D3264237 Speed: Up to 12 Mb/s Manufacturer: github.com/sergev/usb-rom Location ID: 0x14500000 / 16 Current Available (mA): 500 Current Required (mA): 100 Extra Operating Current (mA): 0 Media: USB-ROM: Capacity: 2 MB (2,031,616 bytes) Removable Media: Yes BSD Name: disk5 Logical Unit: 0 Partition Map Type: MBR (Master Boot Record) S.M.A.R.T. status: Verified USB Interface: 0 To be able to mount it, you need to prepare and write a disk image to the Flash memory of the board. The disk image is located in Flash memory starting from address `0x10010000` until `0x10200000`. ## Create disk contents Use one of scripts in the `mkimage` directory: * mkfat-linux.sh - Create FAT12 filesystem on Linux * mkfat-macos.sh - Create FAT12 filesystem on MacOS * mkiso-linux.sh - Create ISO9660 filesystem on Linux * mkiso-macos.sh - Create ISO9660 filesystem on MacOS Any other tools for creating filesystem images with your desired contents also are fine. When disk image is ready, switch your RP2040 board into the boot mode again, and write the image into it by command: picotool load -n filesys.img -t bin -o 0x10010000 After that, press the Reset button on your RP2040 board, and the disk should appear mounted on your computer.
