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  • Case ID: 296020
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BLE DFU softdevice loading issue in bootloader

Sebastiaan

I've been trying to setup BLE DFU bootloading for my nrf52840, using this tutorial:
https://novelbits.io/nrf52-ota-dfu-ble-part-4/

I've come a long way, I've created an blinky app which works button less. 
also setup the bootloader which includes my public key.

Using the nrfConnect app I can initiate the DFU bootloader only to get it into an infinite bootloop.

To diagnose a bit further I hooked on the debugger and setup the booloader to print the debug logs to its uarts.

I can trace the issue currently to the initialization of the softdevice.

in function "ble_stack_init"

err_code = nrf_dfu_mbr_init_sd();
VERIFY_SUCCESS(err_code);

Gets executed and I am always rewarded with an return code: 7

This is where the bootloader resets.


If I disable the initialization by setting NRF_DFU_BLE_SKIP_SD_INIT=1
the next function "nrf_sdh_enable_request();" returns 1
and the bootloader also resets.

Does anyone have a clue what I am doing wrong?
I've been at this for days without any real progress.

I know the softdevice must work, otherwise the blinky application would not be able to communicate with the nrfConnect app

Attached below is a small snippet of the Application + bootloader logs

<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Setting vector table to bootloader: 0x000ED000
<info> app: Setting vector table to main app: 0x00027000
<info> app_timer: RTC: initialized.
<info> app: Blinky. V4.0
<info> app: USBD CDC ACM example started.
<info> app: No USB power detection enabled
Starting USB now
<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Setting vector table to bootloader: 0x000ED000
<info> app: Setting vector table to main app: 0x00027000
<info> app_timer: RTC: initialized.
<info> app: Blinky. V4.0
<info> app: USBD CDC ACM example started.
<info> app: No USB power detection enabled
Starting USB now
<info> app: Connected
<info> app: Device is preparing to enter bootloader mode

<info> app: Device will enter bootloader mode

<info> app: Power management wants to reset to DFU mode.
<info> app: Power management allowed to reset to DFU mode.
<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<debug> app: DFU mode requested via GPREGRET.
<info> nrf_bootloader_wdt: WDT is not enabled
<debug> app: in weak nrf_dfu_init_user
<debug> app: timer_stop (0x200059A0)
<debug> app: timer_activate (0x200059A0)
<info> app: Entering DFU mode.
<debug> app: Initializing transports (found: 1)
<debug> nrf_dfu_ble: Initializing BLE DFU transport
<debug> app: Failed to initialize transport 0, error 7
<error> app: Could not initalize DFU transport: 0x00000007
<error> app: Received an error: 0x00000003!
<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Setting vector table to bootloader: 0x000ED000
<info> app: Setting vector table to main app: 0x00027000
<info> app_timer: RTC: initialized.
<info> app: Blinky. V4.0
<info> app: USBD CDC ACM example started.
<info> app: No USB power detection enabled
Starting USB now

Parents Reply
  • 0 in reply to Sebastiaan

    Hi Sebastiaan,

    I just want to let you know that due to circumstances I have quite the backlog at the moment, and still couldn't get to your case yet.

    I am hoping I can get to it tomorrow.

    I really appreciate your offer. A merge hex could be helpful, as it could at least be used to verify that the SoftDevice in this case, and to immediately see the problem on our end.

    I am very sorry for the delay in response.

    Best regards,

    Hieu.

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