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  • Case ID: 298697
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nRF52840 DK cannot run Direct Test Mode APP in nRF connect for Desktop

chenzhao

Hello

I got a nRF52840 DK and try to use Direct Test Mode APP (v2.0.3) in the nRF Connect for Desktop (v3.12.0).

However, it always says "Can not communicate with device. Make sure it is not in use by another application and it has a Direct Test Mode compatible firmware".

It seems that Uploading image through Jlink process is always 0%.

Does that means I need to connect the Jlink to the nRF52840 DK, apart from the micro-USB connection? 

Hope someone could help answer this question.

Many thanks for your support. 

Logs

=====================================================================================================
19:22:50.099
Validating firmware for device with s/n 001050238327
19:22:54.258
{"chip_erase_mode":"ERASE_ALL","qspi_erase_mode":"ERASE_NONE","reset":"RESET_NONE","verify":"VERIFY_NONE"} 100%
19:22:54.258
Uploading image through JLink: 0%
19:22:54.475
Device programming completed.
19:22:54.479
Device selected successfully
======================================================================================================
Error message

Hardware picture

Parents Reply Children
  • 0 in reply to Amanda Hsieh

    Hi Amanda 

    Many thanks for your feedback. I have downloaded the nRF command line tool using the download link below.

    https://www.nordicsemi.com/Products/Development-tools/nrf-command-line-tools/download#infotabs

    And connect the Jlink to the "Debug in" port in the middle of nRF 52840 DK board and try to run "nrfjprog --recover"  and it works.

    command line log

    ======================================
    D:\>nrfjprog --recover
    Recovering device. This operation might take 30s.
    Erasing user code and UICR flash areas.
    Writing image to disable ap protect.
    =======================================

    Then I can successfully uses Direct Test Mode APP, as shown below.

    ==============================================================

    09:46:55.555
    Using nrf-device-lib-js version: 0.4.13
    09:46:55.555
    Using nrf-device-lib version: 0.12.8
    09:46:55.556
    Using nrfjprog DLL version: 10.16.0
    09:46:55.556
    Using JLink version: JLink_V7.80c
    09:46:55.611
    Installed JLink version does not match the provided version (V7.66a)
    09:47:01.020
    Validating firmware for device with s/n 001050238327
    09:47:05.554
    {"chip_erase_mode":"ERASE_ALL","qspi_erase_mode":"ERASE_NONE","reset":"RESET_NONE","verify":"VERIFY_NONE"} 100%
    09:47:05.554
    Uploading image through JLink: 0%
    09:47:05.924
    Uploading image through JLink: 100%
    09:47:06.109
    Device programming completed.
    09:47:07.350
    Device selected successfully
    09:47:12.518
    Running device setup
    ================================================================
    May I know what is the purpose of "nrfjprog --recover" ? Is it to disable the AP protect? 
    Looking forward to your reply. Thanks.

    Hardware setup

  • 0 in reply to chenzhao

    Hi, 

    The DK is v.3.0.0 which comes with the access port protection enabled. It needs to unlock (nrfjprog --recover) before programming. 

    See IN141 Informational Notice v1.1 and Working with the nRF52 Series' improved APPROTECT. 

    -Amanda H. 

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