JLink Intermittently Resetting Device via Reset Pin

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    • JLink Intermittently Resetting Device via Reset Pin

      Hello,

      My Jlink Base Compact is resetting my device (STM32U585QI) approximately every 8-10 seconds via the reset pin according to the firmware on my device.

      This problem began when I started using my new laptop, a Macbook Pro with an M4 chip running Sequoia 15.5. My previous Macbook with the same OSX version and M1 chip does not exhibit this behavior.

      I recently uninstalled all segger tools and software from my computer and the issue stopped. Immediately upon reinstalling them my device started resetting. I didn't even start an application or interact with the JLink. I have ensured the OSX version, JLink Firmware, and JLink tool versions are all the same.

      Specifications:
      Platform: OSX
      JLink Type: JLink Base Compact
      JLink software version: 7.98b (although I have tried 8.36)
      JLink Firmware: V11
      Target Device: STM32U585QI

      Attempted Solutions:
      • Reinstall JLink Firmware
      • Remove all JLink/SEGGER files from system and reinstall JLink tools 7.98b
      • Different USB ports, i.e. USB Micro on Jlink to usb a hub and JLink to usb A to C adapter directly into PC USB C port
      • Disconnecting and reconnecting connections between the target the device and PC
      • Tried a script that continually set the rest pin high while target device was connected
      • Set VTREF to a static value instead of letting it auto negotiated, tested values of 1.8V and 3.3V
      • Our device uses an intermediate debug board, i.e. PC connects to JLink, JLink connects to debug board, debug board connects to target device, and I have tried multiple debug boards and experienced the same issue


      Please let me know what additional configuration or debug info can help. Thank you.

    • I got it to not reset anymore. I had a system service that started the JLinkGDBServerCL for a different device (an MK82). Disabling that stopped the device from resetting. However I do not have access to the UART/RTT over the JLink connection which I would expect.

    • Hello,

      Glad to hear that you were able to resolve the reset issue.

      Could you please provide a reproducer for the UART/RTT issue?
      Additionally, it would be helpful if you could send us 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.

    • New

      Hi Simon,

      I found the resolution to the issue was I had an old system service on my machine that was running the JLinkGDBServerCL. Even though it was for a different device, it was still causing some sort of interference with my normal JLink connection. That's still a bit of a mystery to me, but removing the service did solve it.

      The issue I was running into to with the uart was because while I was trying to debug the issue I disabled the VCOM port. That's my bad :)

      Kind Regards,

      Grant