Flashing custom nRF52 (Bootloader, SoftDevice, Application)

Good morning,

Is it always required to use Segger J-Link in order to flash Bootloader, Softdevice and Application to a new device?

Could you summarize the different possibilities we have to flash any of these parts?

Furthermore, and regarding the nRF52840: is it possible to use the USB port to flash the device?

Best regards.

  • you need J-Link to flash bootloader. The Softdevice and the application can be flashed OTA

  • As mentioned, you need to program the chip with a bootloader first in order to enable FW update over USB,etc. Different options for programming the chips in production are summarized in this guide: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.gs/dita/gs/prod_test_prog.html?cp=1_0_6  

  • Good morning Vidar. Could you send me the right link in what regards programming chips in production? Is not working now.

    I have developed my custom board based on nRF52840 and up to now, I have no Segger J-Link to flash the bootloader. Our first converstation was some months ago and maybe there are news in what regards how my device can be flashed, so:

    - Do I always need the Segger J-Link to flash bootloader? Are there any other options? Will the ARM Flasher by Segger also work?

    - Can the bootloader be flashed using the USB port?

    - And in what regards SoftDevice, and Application: once I have the bootloader flashed, can they be flashed via BLE the first time (with DFU, of course)?

    - Which method do you recommend to flash Bootloader, SoftDevice, Application for mass production?

    Best regards,

    Dani.

  • Hi Dani, here's an updated link to the documentation I was referring to earlier: Production programming and testing

    Dani said:
    Do I always need the Segger J-Link to flash bootloader? Are there any other options?

     The ICs are shipped blank from our factory, but some third-party modules may come pre-programmed with a bootlaoder. 

    Dani said:
    Can the bootloader be flashed using the USB port?

     Unfortunately, no. The USB can only be enabled and controlled by FW running on the chip.

    Dani said:
    And in what regards SoftDevice, and Application: once I have the bootloader flashed, can they be flashed via BLE the first time (with DFU, of course)?

     You could just flash the MBR and bootloader and program the Softdevice and application afterward. But wouldn't it be better to flash everything at once? It will certainly be faster.  

    Dani said:
    Which method do you recommend to flash Bootloader, SoftDevice, Application for mass production?

    I would say to program everything through the debug interface in one step if possible and not DFU. But it depends. Maybe you want the final FW to be uploaded after the product is enclosed, etc. 

    Best regards,

    Vidar

  • Thank you so much for your answer.

    It will perfect to flash everything at once the first time, but later on, I will need the device to be updated via BLE (just the application).

    Will the Segger ARM Flasher also work to flash everything?

    Best regards,

    Dani

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