RE: Question about flash placement in some NRF52840 examples

Einar Thorsrud — Thu, 23 Sep 2021 11:47:50 GMT

Hi,

Unfortunately you cannot rely on the Programmer app's description of what type of information is located at various locations in flash. As you are using the ble_app_hts example application here without bootloader, the last three pages are used for FDS. And that means that when the FDS pages are initialized by writing a header to the beginning of each page, and that is why you see each page having 8 bytes of data.

[quote user=""]Update: Does peer_manager_init() cause this?[/quote]

Yes. (Initialization of FDS is part of initialization of the peer manager.)

[quote user=""]Additional question: I see that in some example, when define FLASH_SIZE in linker (Segger embedded studio), it takes no effect because I don't see this macro in flash_placement.xml. Correct me if I'm wrong, thanks.[/quote]

You are right. Unfortunately it has no use in the example projects. You will need to adjust FLASH_PH_SIZE to adjust the flash size.