Using flash pages manually

RE: Using flash pages manually

OskarM — Fri, 26 Aug 2016 12:54:40 GMT

I hoped for a really constant (hard coded) flash address. This solution puts on a programmer task of keeping pstorage pages under control and awareness of bootloader size (so the whole area doesn't move). But will have to live with that I assume. Thanks

RE: Using flash pages manually

Einar Thorsrud — Fri, 26 Aug 2016 12:42:28 GMT

The area is also used by pstorage, but you can allocate as much as you need. You should consider both the number of pages needed by pstorage and needed by your application directly, and reserve the sum. Remember that you need to reserve at least two pages for pstorage (one swap page). That means that you need to reserve at least three pages, possibly more, depending on your application.

RE: Using flash pages manually

OskarM — Fri, 26 Aug 2016 12:28:25 GMT

Is this area not connected with pstorage? I mean if I reserve here 2 pages and use pstorage of X blocks, then this adds up?

RE: Using flash pages manually

Einar Thorsrud — Fri, 26 Aug 2016 11:24:38 GMT

You can reserve flash pages in the memory area between the application and the bootloader, right before the beginning of the bootloader. You can access this flash memory, but remember that it is still a protected resource by the SoftDevice, so you must use sd_flash_*() calls to access it. The Memory layout section of the bootloader documentation, and particularily Preserving application data explains the details.