What does the flash address of storing bonding information based S132 SoftDevice v6.1.0?

[tianfei00]

Dear all,

         I modified the example "ble_app_uart" based nRF5_SDK_15.2.0_9412b96. Now I want to store some data in the flash of nRF52832 but I worry I will destory the bonding information which has already stored in the flash when I don not know it's storing address. 

        By reading the "infocenter" of Nordic website, I find the best way for me is to use Flash Storage module when I want to store some data other than using softdevice flash functions. But I can not understand what does the meaning of the word "backend" as a foreign people although I have read it many times. Whether there are detailed explanations about the word "backend" as it is used for Flash Storage module?

       Another question is that when I initialize a instance of Flash Storage by using nrf_fstorage_init( ) by referring the "infocenter", whether I can use the same backend which is already used in the function nrf_fstorage_init( ) by another instance ?

[bjorn-spockeli]

I recommend that you use the Experimental: Flash Data Storage library to store data in Flash. I assume that since you have modified you are using Peer Manager to initiate the bonding procedure and store the bonding information. Peer Manager uses FDS to store the peer data so if you register another user with FDS, then it will automatically place the data you want to store in flash in such a way that it does not overwrite any other records, i.e. the bonding data. 

Best regards

Bjørn 

[tianfei00]

Dear Bjørn,

       I have remembered that Flash Data Storage is just like a filesystem. So I do not need to worry overwriting the same address of flash.

      But I want to know if I have already used Peer Manager to handle the bonding operation,  whether I need to intialize FDS by myself in my code?

       Many thanks for you.

       Best regards,

       tianfei

[bjorn-spockeli]

You do not need to initialize FDS as this is done by the Peer Manager, you only need to register an event handler using fds_register to handle FDS events and then you may use fds_record_write, see Usage.

[tianfei00]

But I need to read and write data by FDS and at that time Peer Manager does not begin to initialize.

[bjorn-spockeli]

OK, and you cannot move the flash reads/writes after pm_init? If that is the case, then you comment out the fds_init() call in  pds_init() in peer_data_storage.c and call  fds_init() at the start of main.