pstorage_update and damaged flash cell

[Konrad Traczyk]

Hi, I've got another question connected with pstorage module. Does anyone know what happens if we will call pstorage_update() function when we are trying to update some data in the working flash cell, but somewhere in the flash page is a damaged cell? Does the pstorage module while copying not affected data, when it gets to the damaged cell returns some kind of an error? Or It stores the data in that cell, but it's content will be unreliable?

[Øyvind Karlsen]

Hi,

Most likely you are going to get a PSTORAGE_ERROR_OP_CODE, NRF_ERROR_NO_MEM or NRF_ERROR_NOT_FOUND error. If you see how flash is being written in ble_flash.c located in "..[SDK]\components\drivers_nrf\ble_flash" you can see that there are being done a lot of checks to verify that everything goes smoothly. Hopefully this answers your question.

Best regards,

Øyvind

[Øyvind Karlsen]

Hi again,

If you want to verify that your flash is not corrupted you can write a known value to the part of the flash that you want to verify, then you can read it back and compare the result with your original value. If you also do this with the inverse value without error, you can be quite certain that there's nothing wrong with the flash.