DFU of App Data section

[Daniel]

SDK14.0.0 nRF52832 s132

I would like to DFU the contents of the App Data section. In particular, I would like to erase the contents for a "factory reset" command.

I've tried creating a separate DFU package that just contains 0xff in addresses 0x74000..0x78000. However, there is no way to specify a "data" DFU package. If I create an application DFU package, then the entire application is erased, and the 0xffs that were intended for 0x74000 are written to 0x23000 instead.

One way I think will work is to increase the size of the application so that it includes addresses up to 0x78000. However, this method adds a lot of time to the DFU process. Is there another way?

[Hung Bui]

If you have a look here, you can find that by default the application data reserved is 3 pages. If you set DFU_APP_DATA_RESERVED to 0, the application data should be erase.

[Daniel]

Understood. For my application, I've increased the number of pages to 4 and set DFU_APP_DATA_RESERVED to 0x4000 to match (nrf52832, virtual page size is 1024).

The issue is that I normally do not want to erase this region during a DFU. It's only during special situations, such as a factory reset, that the region should be erased.