Flash file system on mDot

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  • July 27, 2016 at 7:10 am #14332
    Andrew Lindsay
    Participant

    I’ve used the libmdot functions to create and read files in the flash storage. What I’m looking for is information on any way to access this via the USB mass storage device. I know the ST-Link adaptor in the UDK only implements a form of the USB Mass storage for uploading new firmware images and doesnt actually have any storage in the same way that some of the mbed boards do, like the LPC1768.

    What I’m looking for is a way for the mDot to act as a mass storage device, temporarily, for a file to be copied to it.

    Is this something that is possible?

    Thanks

    Andrew

    July 27, 2016 at 7:21 am #14333
    Jason Reiss
    Keymaster

    The bootloader is part of the mDot platform and can be accessed by sending to the debug serial port just after reseting the device.

    User files in the flash memory are saved with a ‘u_’ prefix prepended to the supplied name through libmDot api. Also if a file is uploaded with the prefix it should show in the libmDot file list.

    bootloader :>
    bootloader :> help
    Available commands:
    help: display this message
    boot: start user application
    upgrade : upgrade to new firmware transferred over serial
    transfer : transfer new firmware over serial, but don’t flash it
    recv simple : read file into the filesystem over serial
    recv ymodem [filename]: read file into the filesystem over serial
    send     : send file from the filesystem over serial
    flash: flash new firmware that has already been transferred
    reset: perform a soft reset of the system
    delete     : delete the specififed file from the filesystem
    erase: erase entire 2MB external flash – BE SURE YOU WANT TO DO THIS!

    July 28, 2016 at 5:15 am #14344
    Andrew Lindsay
    Participant

    Are you saying I need to drop into the bootloader to transfer a file with a prefix of “u_”?
    I was hoping to just drag the file to the mounted drive.

    thanks

    Andrew

    July 29, 2016 at 1:46 am #14361
    Andrew Lindsay
    Participant

    OK, I used the recv simple option, how do I actually terminate the input? Is the file written to the flash once the upload is terminated?

    thanks

    Andrew

    July 29, 2016 at 3:19 am #14362
    Andrew Lindsay
    Participant

    Using the ymodem transfer, I’ve got this to work.

    thanks

    Andrew

    August 3, 2016 at 12:31 pm #14421
    Andrew Lindsay
    Participant

    I’ve tried this a few times now and Ymodem file transfer doesnt seem to be very reliable. I am trying to transfer a 200byte file and it repeatedly times out.

    I have gone back to trying plain text and raw binary but they dont seem to want to complete.

    When the mDot is reset, I can see a 0 byte file when I list the files.

    Any ideas?

    thanks

    Andrew

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