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Retrieve saved info on restard with pstorage module

Hello,

I need to store some app configuration on the FLASH and I'd like to use the features of pstorage module. I don't understand the following thing ...

When the application starts, it uses the pstorage_register (after the pstorage_init of course) to register itself to the pstorage module and then uses it with load and store feature. On restart I can't read what I stored on the previous execution. How for each reboot of application the pstorage knows what's my app FLASH area with my saved info ? I can't find this information ...

Thanks. Paolo.

rgr_cfg.c rgr_cfg.h

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  • Hi ppatierno,

    I am sure this question has been asked many times here, but I will try to answer you. pstorage_register will reserve flash page(s) and the flash page number it reserves depend on the the settings in pstorage_platform.h and the sequence of pstorage_register.

    For exampleyou code has something like this:

    pstorage_init
    .....
    .....
    pstorage_register two pages --> returns block_id1
    ......
    ......
    pstorage_register three pages -->return block_id2
    

    If the sequence of these two register function never changes over system reboots then they will always register the same physical flash page numbers, the block_id1 and block_id2 have same physical address mapping in this case and you can safely write and read your information over reboots.

    but if pstorage_register is done depending on some state machine after reboot, and if the order changes like this after reset

    pstorage_init
    .....
    .....
    pstorage_register three pages -->return block_id2
    ......
    ......
    pstorage_register two pages  --> returns block_id1
    

    Then the block_id to physical address mapping has changed and you wont find the information you stored at the block_id you registered before this reboot.

  • Solved inside the case. Thanks.

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