pstorage_load returning 0xFFFF

[Siva]

hi,

I need to store persistent data of about 32 bytes in flash, so tried using pstorage APIs (SDK v9.0 on nRF51822 -- 256KB).

I followed the sample code given here.

I am getting call-backs, and it notifies that store event is successful (NRF_SUCCESS). But when I do pstorage_load, it returns all 0xFFFF.

I also tried disabling flash r/w protection --> nrf_nvmc_write_word(NRF_UICR_BASE + 4, 0xFFFF);

I even tried using sd_flash_write(), though it returns NRF_SUCCESS the flash memory (0x3F800) is not updated.

Please let me know the issue here or alternative methods. I already read most of the threads related to pstorage issues.

flash.c flash.h

[Petter Myhre]

With pstorage_store() the returned NRF_SUCCESS only means that the store was successfully requested.

You will get an event with opcode PSTORAGE_LOAD_OP_CODE in the registered event handler when the store has actually completed.

For more information see Store Data in the Pstorage documentation.

Edit 25.11.2015: I see that you do a pstorage_clear() before you do pstorage_store() in store_device_name(). If you want to clear you should wait for PSTORAGE_CLEAR_OP_CODE before you do the store.

[Siva]

hi Petter,

I am issuing pstorage_load only after PSTORAGE_LOAD_OP_CODE event is received. I am struck with this 0xFF problem.

[Siva]

Thanks Petter, below input helped me to fix this issue.

"I see that you do a pstorage_clear() before you do pstorage_store() in store_device_name(). If you want to clear you should wait for PSTORAGE_CLEAR_OP_CODE before you do the store."