Secure DFU bootloader: application not starting

[mr91]

Hello,

I have a problem with secure bootloader. what I did:

1. Flash SoftDevice 130 using nRFgo Studio.
2. Compiling \examples\dfu\bootloader_secure\ (i removed the error regarding the key).
3. Flashing the bootloader with Keil (using nrfjprog.exe for flashing).

Unfortunately, the bootloader seems not to run. There is no advertisement "DfuTarg". When I compile the buttonless dfu example and flash it with Keil, there is still no response. So the bootloader does not start the application. There are no debug messages over UART either.

However, when I flash the precompiled debug version (secure_dfu_secure_dfu_ble_s130_pca10028_debug.hex), the bootloader is advertising as "DfuTarg". When I load an application (using Keil or DFU with nrfConnect´), it does not leave the bootloader mode.

Can you tell me whats wrong?

Thank you!

Edit: I use SD130 on nRF51

[Hung Bui]

Hi,

The bootloader was made so that you would need to program the application via DFU bootloader to make it start.

If you don't want to use the DFU bootloader to upload your first application, and prefer to use the programmer instead, you need to alter the bootloader setting in flash to tell the bootloader to start the application. You can generate a bootloader setting hex file then write it to flash to do that. Please have a look here.

[Hung Bui]

Hi daniel,

Thanks for verifying the process from Mr91.

Regarding your question, you can have a look at this example \examples\ble_peripheral\experimental_ble_app_buttonless_dfu to know how to switch to bootloader. The documentation is here.

Note that it's experimental and we may change that in the furture. But it's simply a demonstration on how to switch to bootloader.