Can the empty space on Flash be used to store settings

AndyProp · 2024-02-20 02:47

When flashing any program to the flash with Proptool, Flexprop, Tachoz etc

is the flash empty space left intact, or erased each time?

I have a handful of values that I prefer to store in flash if possible

The next question would be how to see how much space is on the flash for such user data, and then how to W/R some test data starting at the extreams of the flash space.

Finally, JonnyMac described in a post that the Flash chips have some unique serial that can be read, anyone know how to do that in a few lines of code.

ke4pjw · 2024-02-20 03:41

Andy, I save and load configuration items to and from SD and I am sure you can do the same with flash. Here is the memory structure and how I load and save those values. If I need to add a new config item, which I did, I place the new config variable after the last one, and then update the last one in the read/write data object to determine how many bytes to load.

I highly suspect you can do a similar thing with Chip's Flash filesystem.

        long PIXELCONFIG[124]
        long E131CONFIG[432]
        byte MACADDRESS[6]  ' Must be unique per layer 2 network
        byte IPADDRESS[4]
        byte SUBNETMASK[4]
        byte GATEWAY[4]
        byte DHCP 'Non zero
        byte BRIGHTNESS
        byte DNS[4]
        byte SPEEDDUPLEX

  if not \FS.openfile(string("blitzen.cfg"),"R")

    debug("Opened")
    FS.readData(@PIXELCONFIG, @SPEEDDUPLEX - @PIXELCONFIG + 1)
    FS.closeFile()

pub writeconfig()

    if not \FS.openfile(string("blitzen.cfg"),"W")

      debug("Writing Configuration to SD Card.", $0D, $0A)
      FS.writeData(@PIXELCONFIG, @SPEEDDUPLEX - @PIXELCONFIG + 1)
      FS.closeFile()

    else

      debug("Unable to write config. Aborting.", $0D, $0A)
      abort

ke4pjw · 2024-02-20 03:46

Here is a link to the flash filesystem.

https://obex.parallax.com/obex/p2-flash-filesystem/

JonnyMac · 2024-02-20 03:48

The attached demo will get you started. If you want to write and read standard files, Chip wrote a file system for the flash that is maintained by Steven Moraco. You will find threads about it with a quick search.

Can the empty space on Flash be used to store settings

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