JLink unable to connect to target

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    • JLink unable to connect to target

      Both JLinkRTTViewer and JLink command line can not connect to target; JLink output:
      ----------------------
      J-Link>conf
      USB-Address: 0
      Enum. type: Real-SN is used
      Real-SN: 50112953
      KS-Power: Off (Default)
      J-Link>swospeed
      Target connection not established yet but required for command.
      Please specify device / core. <Default>: NRF52832_XXAA
      Type '?' for selection dialog
      Device>exit
      Please specify target interface:
      J) JTAG (Default)
      S) SWD
      F) FINE
      I) ICSP
      C) C2
      T) cJTAG
      TIF>S
      Specify target interface speed [kHz]. <Default>: 4000 kHz
      Speed>
      Device "NRF52832_XXAA" selected.


      Connecting to target via SWD
      InitTarget() start
      InitTarget() end
      InitTarget() start
      InitTarget() end
      InitTarget() start
      InitTarget() end
      InitTarget() start
      InitTarget() end
      Cannot connect to target.
      J-Link>Target connection not established yet but required for command.
      ^C
      Fri 01/31/2020 18:01:25 C:\Program Files (x86)\SEGGER\JLink>

      JLink version is 6.44a, but I tried a later version 6.62a


      Log file of nordic reset command is:

      --------------------------
      Fri Jan 31 18:17:54$ cat log.log
      --------------------------------------------------------------------------------
      C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin\nrfjprog.exe -r --log
      nrfjprog verion 9.7.2
      --------------------------------------------------------------------------------
      FUNCTION: open_dll.
      FUNCTION: open_dll.
      FUNCTION: enum_emu_snr.
      FUNCTION: enum_emu_snr.
      FUNCTION: enum_emu_snr.
      FUNCTION: enum_emu_snr.
      FUNCTION: connect_to_emu_with_snr.
      FUNCTION: connect_to_emu_with_snr.
      FUNCTION: connect_to_emu_without_snr.
      FUNCTION: enum_emu_snr.
      Device "NRF52832_XXAA" selected.
      FUNCTION: read_connected_emu_snr.
      FUNCTION: read_connected_emu_snr.
      FUNCTION: read_device_family.
      FUNCTION: read_device_family.
      JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1.
      JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.
      FUNCTION: close_dll.
      FUNCTION: close_dll.
    • Hi,
      Thank you for your inquiry.
      Such an issue is not known to us.

      1) Could you please follow the troubleshooting article on the page linked below
      and send us a screenshot of the entire J-Link Commander output?
      wiki.segger.com/J-Link_cannot_…the_CPU#Target_connection
      2) Could you please send us a J-Link log file? How to enable:
      wiki.segger.com/J-Link_DLL#Enable_J-Link_Log_File
      3) Do you use custom hardware or an evaluation board? In the latter case which one?
      3.1) If custom hardware, do you experience the same problem on an evaluation board?
      4) Is there an application running on the target?
      5) Is the target in any low power mode or similar?

      Best regards,
      Fabian
      Please read the forum rules before posting: Forum Rules

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