Flash file system on mDot

[Andrew Lindsay]

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

[Jason Reiss]

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!

[Andrew Lindsay]

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

[Andrew Lindsay]

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

[Andrew Lindsay]

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

thanks

Andrew

[Andrew Lindsay]

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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