Data is not retained in memory after power off

[soumil]

Hi,

I am storing data using pstorage module but when i power off my nrf51-dk board, the contents get deleted and not retained in memory. What could be the reason for that?

I am using S130 and SDK11.

PSTORAGE_NUM_OF_PAGES as 2

block_size = 20 block_count = 2

[Stefan Birnir Sverrisson]

Hi

How quickly do you power off the nRF51-DK? The nRF51 should have enough time to finish its write operation and return a callback to indicate that the operation has completed. Did you receive the callback?

What pstorage code are you using?

How do you check the flash content after power off?

[soumil]

Thanks for replying. I turn off the Nrf51-dk only after receiving the write operation callback. The code I am using is similar to what is mentioned in this thread devzone.nordicsemi.com/.../ In order to check the flash content after power off, i have added the load operation on a press of button. But it always gives an output of 0 rather than the flash content.

[Stefan Birnir Sverrisson]

Hi soumil

In order to find out what is going on, perhaps you could read the flash address manually before powering the nRF51 off and then again read the same flash address after booting up.

Read 20 byte flash contents from memory address 0x0003F400 with the command:

nrfjprog --memrd 0x0003F400 --n 20

You can do the same after power down of the nRF51 to manually verify that the same flash address retains the written values.

In order to realize where pstorage stores the values of allocated blocks, look at this thread.