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RASPBERRY PI PICO DEVICE MSC INCREASE SIZE

gabofienco
Hello all,
I am working in a project where I plan to use rp2040 tiny usb device to store some files greater than 5MB in a SDCARD.
My question is.. any ideas how to make the MSC device to point to the address or path generate by rp2040 to the SDCARD??. and if not possible to change the pointing address will be good to know too.
Or how to make the device MSC to look with a size of 128MB in windows just like it does when it is in boot mode?
I had used these references, but I still can't have a good mounted device with a bigger size that is not overflowing flash/ram.
Thanks for your time.
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  • Don't forget that the Pico / RP2040 only runs USB 1.1. Even at 12 megabit/s, 128 megabyte is going to take a very long time to fill.

    You'll probably need to look for examples of projects where people have done what you want, but with other processors.

    The process is not as simple as using the TinyUSB example, changing the max size, and "pointing" to the SD Card. You have write the SD Card handler and figure out how to interface it with the communication that TinyUSB provides.

  • in reply to baldengineer

    oh really, I expected its usb 2.0 like the ESP32S2 has since they both use tinyusb and got released in the same era, I wasn't expecting anything below 2.0
    Good to know!

  • in reply to mayermakes

    Most MCUs have only 12 Mbit USB (Full-Spped). For summary:

    USB Low-Speed (LS) 1.5 Mbps: possible to implemnt with bitband even MCU do not support it. (https://www.obdev.at/products/vusb/index.html). Some MCUs with FS driver can be downgraded to this speed but I do not know any good reason for doing this except supporting very very very old USB hosts.

    USB Full-Speed (FS) 12 Mbps: hard to implement with bitband, HW accelerator included in many nowadays MCUs including RP2040. This is standard in MCU world.

    USB High-Speed (HS): 480 Mbps: requires special driver and PHY, nowadays supported by advanced MCU, but generaly it is rarely supported in embedded world.

    USB Super-Speed (SS): 5 Gbps: no MCU support, very few MPU support it. Usualy done by external controller connected on PCIe bus.

    There are some newer speeds but I have no epxeriences with it.

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  • in reply to mayermakes

    Most MCUs have only 12 Mbit USB (Full-Spped). For summary:

    USB Low-Speed (LS) 1.5 Mbps: possible to implemnt with bitband even MCU do not support it. (https://www.obdev.at/products/vusb/index.html). Some MCUs with FS driver can be downgraded to this speed but I do not know any good reason for doing this except supporting very very very old USB hosts.

    USB Full-Speed (FS) 12 Mbps: hard to implement with bitband, HW accelerator included in many nowadays MCUs including RP2040. This is standard in MCU world.

    USB High-Speed (HS): 480 Mbps: requires special driver and PHY, nowadays supported by advanced MCU, but generaly it is rarely supported in embedded world.

    USB Super-Speed (SS): 5 Gbps: no MCU support, very few MPU support it. Usualy done by external controller connected on PCIe bus.

    There are some newer speeds but I have no epxeriences with it.

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