problem about DFU

RE: problem about DFU

jane xue — Tue, 30 Jan 2018 03:28:19 GMT

Hi,Bjørn thank you for your reply.I will see it carefully. Best wishes!

RE: problem about DFU

Bjørn Kvaale — Mon, 29 Jan 2018 07:53:45 GMT

Hi Jane, sorry for the delayed response. If you take a look at the bootloader_secure example in SDK 12.3 for example (SDK12.3/examples/dfu/bootloader_secure), you notice that in the main() function of the main.c file that the function nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR) is called. This is verified by taking a look at this link: "If there is a valid application, the DFU bootloader starts the application, unless it is explicitly put into DFU mode (for example, by pressing a button)." Normally it is the DFU bootloader that initiates the DFU process, not the application itself (see blog post). It is possible to jump from the application to the dfu bootloader (see link), so I guess you could initiate the DFU again if you want.

RE: problem about DFU

jane xue — Wed, 24 Jan 2018 05:56:10 GMT

Hi,Bjørn I will ask for you again. 1、In the bootloader ,after DFU,why it districtly enters into Application program,rather than systerm reset? 2、if bootloader executes the DFU and defines the DFU service,if after DFU it districtly enters into application program and in the application program again defines the DFU service,what will happen? thank you again!

RE: problem about DFU

jane xue — Wed, 24 Jan 2018 05:47:51 GMT

Hi,Bjørn thank you for your reply. This part of DFU function was finished by other person.I took over his work,so I can't fully understand DFU.but the DFU has strange problem,so I post it . I am learning the dfu and will amend it . thank you very much!

RE: problem about DFU

Bjørn Kvaale — Tue, 23 Jan 2018 13:01:09 GMT

Are you using the ble secure dfu bootloader example in SDK 12.3? Have you followed the link on the nordic infocenter or the secure dfu bootloader blog post?