Bootloader start

[Albin]

Hello,

I am trying to configure my own bootloader for DFU, i use the secure_bootloader_ble_s132 as an exemple for nrf52832 DK.

after i flash the softdevice, the app and the bootloader the DK always starts at the bootloader. How do I make it start at the app ?

here is my sdk config for the bootloader

#define NRF_BL_DFU_ENTER_METHOD_BUTTON 0

#define NRF_BL_DFU_ENTER_METHOD_PINRESET 0

#define NRF_BL_DFU_ENTER_METHOD_GPREGRET 1 // i have also tried at 0 it changes nothing

#define NRF_BL_DFU_ENTER_METHOD_BUTTONLESS 0

My goal is to enter in dfu mode from the app not at the start what do i have to change for that ?

[Einar Thorsrud]

Hi,

You need to generate and program the bootloader settings page as well. This is used by the bootloader to know if a valid application is present, and the hash of the application so that it can be validated by the bootloader. If this is not present or invalid, the bootloader will enter DFU mode in order to make recovery possible. See Generating and displaying bootloader settings.

[Albin]

Hello i've tried to create the settings file like this : 

then i've merged it with the .hex of the bootloader

then i used nrf connect programmer to flash eveything : 

but the application is still stuck in the dfu mode.

Have i done something wrong ?

[Einar Thorsrud]

Hi,

Most of this looks correct, but the settings version should be 2 if you are using a recent SDK version.

[Albin]

Hello, 

i'm on SDK 17 i've changed the version to 2 but i'm still stuck in DFU mode. I have a question on the settings file : 

i have a softdevice of 149876 Kb while the setting says 0 

and my app is 23784 whule the setting says 17536

maybe there is a problem here ? do those values have to match ?

[Albin]

That was indeed the issue i got the starting address of the application wrong i belive this is why the bootloader was considering it as invalid

Thank you for your help !