data written flash is erased

[jerly]

Hi:

   i use SDK7.0 , i write data in flash (address:0x0003fc00)and the data is erased when SDK run.

and is there any way to protect the page that i want to write or other solution.thanks.

[Petter Myhre]

How are you writing to flash? Are you using a SoftDevice? What do you mean by when SDK run?

[jerly]

thank you for your answer.i used a softdevice(7.1).and i used"ble_flash_block_write" in ble_flash.c directly.the data was written right when the code run after "ble_flash_block_write".but when i continued running the code.and i watched memory was clear.maybe data was cleared by sdk or sd.and do you have any demo code or other solution for me.thanks

[Petter Myhre]

When the SoftDevice is enabled you should use sd_flash_page_erase() and sd_flash_write() functions. Please see Section 7 in the S110 SoftDevice Specification 2.0 for more information.

If the flash operation is succesful you will get a NRF_EVT_FLASH_OPERATION_SUCCESS event in sys_evt_dispatch(). I recommend you to have a flag that is set you do a flash operation, and is unset when you get NRF_EVT_FLASH_OPERATION_SUCCESS. Check the flag before you do a flash operation.

We also have a module for handling flash operations, Pstorage.