RE: Persistent data lost after DFU

peterh — Fri, 21 Aug 2015 12:06:12 GMT

The default bootloader doesn't preserve space for app data, i.e. DFU_APP_DATA_RESERVED = 0. Guess I'll have to build one myself - thanx for the useful pointers to documents etc.

RE: Persistent data lost after DFU

Stefan Birnir Sverrisson — Tue, 18 Aug 2015 11:21:39 GMT

Hi peterh

Perhaps the bootloader is overwriting your application data that you store in flash. To prevent that, you need to consider where the bootloader is writing its data and preserve space for application data in bootloader settings, i.e. in the dfu_types.h -> DFU_APP_DATA_RESERVED.

For realizing how the bootloader operates exactly, watch this video.

To realize better how data is placed in flash during bootloader update, look at this thread.

Further bootloader info is given on this thread.