Retrieve saved info on restard with pstorage module

[ppatierno]

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

[Susheel Nuguru]

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.

[Susheel Nuguru]

are you doing pstorage_init twice? in device_manager_init and in your code? it should be done only once. pstorage register can be done multiple times if possible please post your main.c, you can delete the file after we solve this issue