RE: Application doesn´t run when it is update with a DFU

Einar Thorsrud — Fri, 08 Oct 2021 12:08:09 GMT

Hi,

First of all, I recommend using the debug bootloader (example project with "_debug" in the end of the name). This has RTT logging when you experience problems with DFU. That will let you easily see if the bootloader starts the application or not, and if not, why. Can you try that first, and upload the log here?

Have you tested your application so that it does runs when you do not use a bootloader? Remember that the application start address must always be immediately after the SoftDevice. So, if you are using S132 7.2.0 the start address must be 0x26000. This is regardless of if using bootloader or not. So your FLASH_START is clearly wrong. Please test your application without bootloader first to fix such issues which are not related to the bootloader.

After this, hve you remembered to generate and program a bootloader settings page if you flashed the application directly and not via DFU? If not, the bootloader will not know that a valid application is present and will not start it.