flash Read Exception

[chad.ou]

Hi, I am here in the use of Flash memory data when there is a strange question to consult. Due to my side of the application, you need to enter each case sd_power_system_off need to perform pstorage_update, update my data to the Flash kept inside. But I am here to test about twenty times, and found the data pstorage_load after all become 0xff, I doubted flash endurance, but I do not know so little, I can not think of other possibilities.

[Susheel Nuguru]

Before your system goes to system_off, does it check if the pstorage operation has completed? It should return the operation result as a system event. You have to wait for it before you go to system off.

[chad.ou]

I have to check cmd_queue_enqueue this return NRF_SUCCESS. And judging by pstorage callback handler is complete.

[Petter Myhre]

Did you test 20 times and it failed 20 times, or did it fail 1 out of 20 times? Are you using any other pstorage operations that are working? That pstorage_update() or cmd_queue_enqueue() returns NRF_SUCCESS only means that the pstorage software accepted your command. It doesn't mean that flash is actually updated.

You need to register a callback handler according to the documentation.

Then you will have to wait for the PSTORAGE_UPDATE_OP_CODE. This tells you that the update operation is completed, then you can go to System OFF.

[chad.ou]

Thank Petter reply, I tested is from the normal working pstorage_update, then sd_power_system_off, wake up, pstorage_load, pstorage_update, such a cycle. There may be some data becomes 0xff pstorage_updat that after more than twenty normal cycle. In writing to flash when there callback handler.

[Petter Myhre]

Next time, please edit your question and add the code there. I can't see any call to sd_power_system_off(). Are you sure all flash operations are complete when you call it? When are you calling it? Maybe you should add some code in case PSTORAGE_UPDATE_OP_CODE:?