safe to use NVM space?

[Frank Zhao]

I see in the example code there is

#define FLASH_PAGE_SYS_ATTR (BLE_FLASH_PAGE_END - 3)                    /**< Flash page used for bond manager system attribute information. */
#define FLASH_PAGE_BOND (BLE_FLASH_PAGE_END - 1)                    /**< Flash page used for bond manager bonding information. */

Does that mean "(BLE_FLASH_PAGE_END - 4)" is safe to use for my own NVM storage?

Do I need to adjust my IROM length in Keil's project build configuration?

Thanks

[Ole Morten]

Any flash area that is not used by your application is safe to use. You can calculate which area is safe by looking at the sizing output from Keil at the end of compilation, and doing the math, but there isn't any magic way to find such area.

By adjusting the the IROM size in Keil, you will get errors from compilation if your app tries to extend into this area, so that's something I'd normally recommend you to do.

[Frank Zhao]

Your code has another hidden area that I didn't know about, apparently "(BLE_FLASH_PAGE_END - 2)" is reserved for logging error exceptions. I'd rather see one page where all of this is documented, or a better method being used, such as a linker file symbol and attributes.