File System creation on eeprom

Erik Friesen

I am making a handheld input device that has a small lcd and keypad.· I have it arranged to keep the current project opened and backed up to a fram.· When it comes time to save the data, I want to·save the file to the upper 32K of a 24lc512.· I will use a new,open,save,save as, and delete menu.· Each project fits within 256 bytes.·

Can someone give me some pointers on how to create a File system that automatically finds a blank spot or creates an index that also can alphebatize itself?

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Mike Green

Some time ago I wrote a simple "operating system" for the Propeller that included a "file system" that resided in EEPROM complete with file names and routines that kept track of what was used and not used. It used 32K "files", but these could be made smaller. The last 16 bytes of each area were used for a 12 byte file name plus some checksums. Anyway, here's the thread. The "OS_filesystem" file has most of the routines used for maintaining the "file system".

http://forums.parallax.com/showthread.php?p=598350

Erik Friesen

Thanks Ill check it out.