RE: start app after dfu uploading nrf52

bjorn-spockeli — Tue, 14 Feb 2017 10:06:17 GMT

Hi Abosh,

the secure bootloader in SDK v12.x behaves the same way, i.e. it will start the application automatically after the update is completed, and you should not have to do any modifications to the bootloader. However, it is important that you clear the byte stored in flash to indicate that the device should enter bootloader mode immediately after entering the bootloader.

The secure bootloader will not wait for a specific event in the wait_for_event() function in nrf_dfu_init() (nrf_dfu.c), but perform a SoftReset when the application update is complete and then re-enter nrf_dfu_init(), go past the if-statement that starts the bootloader

 if(enter_bootloader_mode != 0 || !nrf_dfu_app_is_valid())
    {
         ....
    }

and enter the following if-statement

if (nrf_dfu_app_is_valid())
    {
        NRF_LOG_INFO("Jumping to: 0x%08x\r\n", MAIN_APPLICATION_START_ADDR);
        nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR);
    }

and start the application.

Best regards

Bjørn