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CC1352R: Protect NVS sectors during reboot / program load / etc.

user5943842
Expert 1550 points
Part Number: CC1352R

Currently I am using the NVS driver to read and write from a FLASH sector. When I read directly after I write, I can see the right data. However, if I read after a program load, it is gone.

How to make sure that that flash sector is not being erased when I enter debugging mode / flash it / reboot the device? I have tried to set Debug Configuration -> Flash Settings->Erase Settings during Program Load to "Do not erase sectors (program load only)", but then I get this error:

Cortex_M4_0: File Loader: Memory write failed: Timed out waiting for target flashloader to execute command.

I also tried to use the CCFG.c file and set SET_CCFG_CCFG_PROT_... to protect all sectors, and then set the Debug Configuration->Flash Settings->Erase Settings during program load to "All unprotected sectors". However, that still does not work.

What am I missing?

  • 0
    Expert 1550 points

    Currently I can have persistent storage using NVS to address 0x50000, if I set Project Properties->Debug->Flash Settings->Skip Sectors during Program Load. I don't even have to fill in a specific sector. If I do fill in a sector, it does not matter which one, it will always work. However, If i disable sector skipping option, it does not work anymore.

    This is not what I would expect.

    Also I tried to use CCFG_WRITE_PROT_*, and set them all to 0x00000000, which seems to do nothing. The data is still written.

    This is also not as I would expect.

  • 0 in reply to user5943842
    TI__Guru 56590 points

    Hello User,

    Which program do you use?

    If different parts of your code needs to placed in a sector that sector will be erased on program load.

    Did you set:

    Project Properties->Debug->Flash Settings->Program Load Settings: Necessary Sectors Only (Retain untouched content within sector)

  • 0 in reply to Eirik V
    Expert 1550 points

    Hello Eirik,

    I am using Code Composer Studio.

    Is necessary sectors only safe to use, or is it better to protect specific sectors?
    Currently I am confused as to which sectors in the CCFG and program load sections map to which addresses. The sectors in the program load settings seem to overlap, as protect sector 3 gives the same results as protecting sector 5. Moreover, even if I write protect all sectors in the CCFG, I can still use NVS to write to a sector, which is not what I would expect?

  • 0 in reply to user5943842
    TI__Guru 56590 points

    Hello User,

    You should be careful to edit the last sector where CCFG reside. You can potentially brick the device if you disable JTAG and flash erase.

    Show me a screen shot of your entire Project Properties->Debug->Flash Settings.

  • 0 in reply to Eirik V
    Expert 1550 points

    Currently I have them as in the attached screenshot.

    My goal: Have a few sectors of non-volatile storage (also between program loads), and have 1 section as read-only after I have written it once (which I need the CCFG settings for I believe)

  • 0 in reply to user5943842
    TI__Guru 56590 points

    Hello User,

    You need to change to "Necessary Sectors Only" and then you should reserve the pages in your linker cmd file.

  • 0 in reply to Eirik V
    Expert 1550 points

    Thank you Eirik.

    The last challenge now is to figure out which sector to protect using CCFG_WRIT_PROT_*. If I were to place a section on the page right under CCFG, would it be the very last sector I would have to protect? I don't want that specific sector to ever be written to again after I have written to it once.

  • 0 in reply to user5943842
    TI__Guru 56590 points

    Hello User,

    Each sector/page is 8 kB with a total of 44 sectors (0-43). The last sector (43) is reserved for CCFG and application code (or BIM). You could reserve sector 42 then try to modify that sector with unliflash or flash programmer 2 to verify that its write protected.

  • 0 in reply to Eirik V
    Expert 1550 points

    Hello Eirik,

    Thank you, this is all I needed to know!