RTT Logger not finding my JLink

    • RTT Logger not finding my JLink

      Hi everyone,

      I'm encountering an issue with my J-Link Base when trying to use it with RTT Logger from software pack 8 (tried 8.24 and 8.38)
      It looks like the probe is not detected

      Brainfuck Source Code

      1. C:\Program Files\SEGGER\JLink_V824>JLinkRTTLogger.exe -Device NRF52840_XXAA -if SWD -Speed 4000 -RTTChannel 0 C:\Users\luc\Desktop\logger.log
      2. SEGGER J-Link RTT Logger
      3. Compiled Mar 26 2025 15:35:11
      4. (c) 2016-2017 SEGGER Microcontroller GmbH, www.segger.com
      5. Solutions for real time microcontroller applications
      7. Default logfile path: C:\Users\luc\AppData\Roaming\SEGGER
      9. ------------------------------------------------------------
      12. Shutting down... Done.
      Display All

      RTT Viewer from the same software packs works fine.

      If I use the same RTT Logger command with an older software pack version (like 7.94i) the probe is correctly detected and everything works as expected

    • Hello,

      We are not aware of such an issue.

      To help us investigate further, could you please provide a J-Link log file from the failing scenario?
      Instructions on how to enable logging can be found here:
      wiki.segger.com/J-Link_DLL#Enable_J-Link_Log_File

      Best regards,
      Simon
      Please read the forum rules before posting.

      Keep in mind, this is *not* a support forum.
      Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
      Should you be entitled to support you can contact us via our support system: segger.com/ticket/
      Or you can contact us via e-mail.

    • Hi, this command
      JLinkRTTLogger.exe -Device NRF52840_XXAA -if SWD -Speed 4000 -RTTChannel 0 C:\Users\luc\Desktop\logger.log

      produced this output

      Brainfuck Source Code

      1. SEGGER J-Link RTT Logger
      2. Compiled Mar 26 2025 15:35:11
      3. (c) 2016-2017 SEGGER Microcontroller GmbH, www.segger.com
      4. Solutions for real time microcontroller applications
      6. Default logfile path: C:\Users\luc\AppData\Roaming\SEGGER
      8. ------------------------------------------------------------
      11. Shutting down... Done.
      Display All
      and the attached Log Override file
      Files

    • New

      Hello,

      I am able to reproduce the issue.

      We will fix this issue in one of the upcomming releases.
      Stay up-to-date regarding J-Link:
      segger.com/notification/subscribe.php?prodid=7,94

      For now a workaround for this issue would be to manually specify the SN or nickname of your J-Link. See -USB command line option:
      kb.segger.com/J-Link_RTT_Logger

      Best regards,
      Simon
      Please read the forum rules before posting.

      Keep in mind, this is *not* a support forum.
      Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
      Should you be entitled to support you can contact us via our support system: segger.com/ticket/
      Or you can contact us via e-mail.