saving information through a DFU

RE: saving information through a DFU

JayPRab — Wed, 30 Jan 2019 13:37:02 GMT

Thanks Bjorn!

RE: saving information through a DFU

JayPRab — Wed, 30 Jan 2019 13:36:46 GMT

Thanks Mrono! Very helpful. Will check it out

RE: saving information through a DFU

bjorn-spockeli — Wed, 30 Jan 2019 10:09:58 GMT

HI Jay, as mrono states the Nordic Bootloaders (both Secure and Legacy) have a configurable option that allows you to set the number of pages below the bootloader that should be retained during a DFU. See Preserving application data in the SDK v12.3.0 documentation of the Secure Bootloader for the nRF51 and see Preserving application data if you're using the Legacy Bootloader (SDK v11.0.0 or older).

RE: saving information through a DFU

mrono — Wed, 30 Jan 2019 08:24:19 GMT

Nordic's secure bootloader has a configuration option for that (NRF_DFU_APP_DATA_AREA_SIZE). So if you are using the Nordic libraries for flash data storage and DFU then setting that should be all that is needed.

Basically the bootloader assumes the data area is located at the last flash pages before the bootloader, so the define above tells it how many pages to leave untouched.