Custom board SWD programming with nrf52-dk

[krf]

Hi everyone,

I am trying to use a PCA10040 (nRF52 DK) as an external debugger to program a custom nRF52832 target board, but I keep running into J-Link backend errors (-256 and -102).

Interestingly, my board's interface/debugger chip is an onboard nRF5340 chip, and the J-Link logs show it initializing with the J-Link OB-nRF5340-NordicSemi firmware.

To ensure proper power and signal integrity, we verified that the target VTG is connected directly to the board's onboard VDD rail (sitting stable at 3V), and all ground paths are securely tied together. Additionally, a full continuity test was performed from the physical chip pads to the debug header to guarantee there are no broken traces or cold solder joints on the SWDCLK, SWDIO, and reset lines

Hardware Setup & Verification:

• Debugger: PCA10040 (nRF52 DK)

• Target: Custom nRF52832 board

• Power & Logic Checked:

  • Target VTG is stable at 3V.

  • GND lines are firmly connected.

  • nRF Reset pin is pulled up / stable at 3V.

  • SWDCLK and SWDIO are correctly mapped.

What We Have Tried:

1. Swapped SWDIO/SWDCLK pins to double-check against accidental reversals.

2. Verified that the P19/P20 select pin voltage states are active.

3. Lowered SWD clock frequencies.

4. Attempted recovery using both nrfutil device recover and nrfjprog -f nrf52 --recover.

Error Logs:

When running nrfjprog --eraseall --log, the J-Link backend throws error -256 repeatedly, followed by a Coresight configuration failure:

[2026-Aug-25 10:56:48] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 736.
[2026-Aug-25 10:56:48] [info] [SeggerBackend] - Segger dll version 9.24.a loaded.
...
[2026-Aug-25 10:56:48] [trace] [ JLink] - Firmware: J-Link OB-nRF5340-NordicSemi compiled Jul 8 2025 10:15:34
...
[2026-Aug-25 10:56:48] [error] [ Client] - Encountered error -102: Command connect_to_emu_with_snr executed for 250 milliseconds with result -102
[2026-Aug-25 10:56:48] [trace] [ JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2026-Aug-25 10:56:48] [trace] [ JLink] - - 0.638ms returns -1

(Note: The log shows the debugger firmware reporting as J-Link OB-nRF5340-NordicSemi, even though the board is a PCA10040).

Also output for vscode flashing:

Error: One or more batch tasks failed:
* 1050357465: Device error: Setting the debug port SELECT register failed while powering up sys and debug regions (Unknown error in the J-Link DLL (error code =-1)).

This might indicate that the debug port is unavailable. Double-check device power supply and SWD lines, and ensure that SWD is not disabled (Generic)

FATAL ERROR: command exited with status 1: nrfutil --json device x-execute-batch --batch-path 'pathto-projectfolder\zephyr\generated_nrfutil_batch.json' --serial-number 1050357465

Another output from nrf programmer:

11:45:48.291

Reading readback protection status for Application core

11:45:48.292

Reading readback protection status for Application core 0%

11:45:48.331

Reading readback protection status for Application core 50%

11:45:48.331

Reading readback protection status for Application core 50%

11:45:48.443

Failed "reading readback protection status for application core". Error: code: 1, description: Generic, message: Batch task protection-get failed, Device error: Setting the debug port SELECT register failed while powering up sys and debug regions (Unknown error in the J-Link DLL (error code =-1)). This might indicate that the debug port is unavailable. Double-check device power supply and SWD lines, and ensure that SWD is not disabled

And log file for nrfjprog --eraseall --log

 

Fullscreen 37185.log.log Download

[2026-Aug-25 11:47:24] [debug] --------------------------------------------------------------------------------
[2026-Aug-25 11:47:24] [debug] nrfjprog --eraseall --log 
[2026-Aug-25 11:47:24] [debug] nrfjprog version 10.24.2 external
[2026-Aug-25 11:47:24] [debug] --------------------------------------------------------------------------------
[2026-Aug-25 11:47:24] [ info] Load library at C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin\nrfjprog.dll.
[2026-Aug-25 11:47:24] [ info] Library loaded, loading member functions.
[2026-Aug-25 11:47:24] [ info] Member functions succesfully loaded.
[2026-Aug-25 11:47:24] [debug] [ Client] - open
[2026-Aug-25 11:47:24] [debug] [ Client] - start
[2026-Aug-25 11:47:24] [ info] [ Client] - stdout: Jlinkarm nRF Worker ready. Handling sequence 640b1508-83b7-471c-9256-6a7c53393fd4.

[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Logger sink registered in Segger backend logger
[2026-Aug-25 11:47:24] [debug] [  JLink] - Logger sink registered in JLink logger
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - open
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - just_check_family
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - open_dll
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - No J-Link DLL path was provided. Attempting to auto detect.
[2026-Aug-25 11:47:24] [trace] [ Client] - Command open executed for 75 milliseconds with result 0
[2026-Aug-25 11:47:24] [debug] [ Client] - config
[2026-Aug-25 11:47:24] [ info] [SeggerBackend] - Load library at C:\Program Files\SEGGER\JLink_V924a\JLink_x64.dll.
[2026-Aug-25 11:47:24] [ info] [SeggerBackend] - Library loaded, loading member functions.
[2026-Aug-25 11:47:24] [ info] [SeggerBackend] - Member functions succesfully loaded.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Set batch mode
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 736.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - dll_version
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 629.
[2026-Aug-25 11:47:24] [ info] [SeggerBackend] - Segger dll version 9.24.a loaded.
[2026-Aug-25 11:47:24] [trace] [ Worker] - Command open executed for 3 milliseconds with result 0
[2026-Aug-25 11:47:24] [trace] [ Client] - Command config executed for 15 milliseconds with result 0
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - config
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - enum_emu_snr
[2026-Aug-25 11:47:24] [trace] [ Worker] - Command config executed for 2 milliseconds with result 0
[2026-Aug-25 11:47:24] [debug] [ Client] - enum_emu_snr
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - enum_emu_con_info
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3139.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - enum_emu_con_info
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 911.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3139.
[2026-Aug-25 11:47:24] [trace] [ Worker] - Command enum_emu_con_info executed for 2 milliseconds with result 0
[2026-Aug-25 11:47:24] [trace] [ Client] - Command enum_emu_con_info executed for 15 milliseconds with result 0
[2026-Aug-25 11:47:24] [debug] [ Client] - connect_to_emu_with_snr
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - connect_to_emu_with_snr
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3139.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - connect_to_emu_with_snr
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3139.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_enum_emu_snr
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_get_num_emus
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3087.
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3112.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_connect_to_emu_with_snr
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3349.
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_connect_to_emu_without_snr
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Segger logging enabled.
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3160.
[2026-Aug-25 11:47:24] [error] [SeggerBackend] - JLinkARM.dll reported error -256 at line 3176.
[2026-Aug-25 11:47:24] [trace] [  JLink] - Firmware: J-Link OB-nRF5340-NordicSemi compiled Jul  8 2025 10:15:34
[2026-Aug-25 11:47:24] [trace] [  JLink] - Firmware: J-Link OB-nRF5340-NordicSemi compiled Jul  8 2025 10:15:34
[2026-Aug-25 11:47:24] [trace] [  JLink] - Hardware: V1.00
[2026-Aug-25 11:47:24] [trace] [  JLink] - S/N: 1050357465
[2026-Aug-25 11:47:24] [trace] [  JLink] - OEM: SEGGER
[2026-Aug-25 11:47:24] [trace] [  JLink] - Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB
[2026-Aug-25 11:47:24] [trace] [  JLink] - Bootloader: 2021 May 18
[2026-Aug-25 11:47:24] [trace] [  JLink] - USB speed mode: Full speed (12 MBit/s)
[2026-Aug-25 11:47:24] [trace] [  JLink] - TELNET listener socket opened on port 19021
[2026-Aug-25 11:47:24] [trace] [  JLink] - WEBSRV WEBSRV_Init(): Starting webserver thread(s)
[2026-Aug-25 11:47:24] [trace] [  JLink] - WEBSRV Failed to put socket into listener state (port 19080)
[2026-Aug-25 11:47:24] [trace] [  JLink] - WEBSRV Webserver running on local port 19081
[2026-Aug-25 11:47:24] [trace] [  JLink] - Looking for J-Link GUI Server exe at: C:\Program Files\SEGGER\JLink_V924a\JLinkGUIServer.exe 
[2026-Aug-25 11:47:24] [trace] [  JLink] - Forking J-Link GUI Server: C:\Program Files\SEGGER\JLink_V924a\JLinkGUIServer.exe 
[2026-Aug-25 11:47:24] [trace] [  JLink] - J-Link GUI Server info: "J-Link GUI server V9.24a " 
[2026-Aug-25 11:47:24] [trace] [  JLink] - Device "CORTEX-M4" selected.
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 61.399ms returns 0x00  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_OpenEx(...)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - Firmware: J-Link OB-nRF5340-NordicSemi compiled Jul  8 2025 10:15:34
[2026-Aug-25 11:47:24] [trace] [  JLink] - Firmware: J-Link OB-nRF5340-NordicSemi compiled Jul  8 2025 10:15:34
[2026-Aug-25 11:47:24] [trace] [  JLink] - Hardware: V1.00
[2026-Aug-25 11:47:24] [trace] [  JLink] - S/N: 1050357465
[2026-Aug-25 11:47:24] [trace] [  JLink] - OEM: SEGGER
[2026-Aug-25 11:47:24] [trace] [  JLink] - Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB
[2026-Aug-25 11:47:24] [trace] [  JLink] - Bootloader: 2021 May 18
[2026-Aug-25 11:47:24] [trace] [  JLink] - USB speed mode: Full speed (12 MBit/s)
[2026-Aug-25 11:47:24] [trace] [  JLink] - TELNET listener socket opened on port 19021
[2026-Aug-25 11:47:24] [trace] [  JLink] - WEBSRV WEBSRV_Init(): Starting webserver thread(s)
[2026-Aug-25 11:47:24] [trace] [  JLink] - WEBSRV Failed to put socket into listener state (port 19080)
[2026-Aug-25 11:47:24] [trace] [  JLink] - WEBSRV Webserver running on local port 19081
[2026-Aug-25 11:47:24] [trace] [  JLink] - Looking for J-Link GUI Server exe at: C:\Program Files\SEGGER\JLink_V924a\JLinkGUIServer.exe 
[2026-Aug-25 11:47:24] [trace] [  JLink] - Forking J-Link GUI Server: C:\Program Files\SEGGER\JLink_V924a\JLinkGUIServer.exe 
[2026-Aug-25 11:47:24] [trace] [  JLink] - J-Link GUI Server info: "J-Link GUI server V9.24a " 
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 36.036ms returns "O.K."  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_Lock()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_ExecCommand("SetRestartOnClose = 0", ...).   
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.005ms returns 0x01  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_ExecCommand("DisableFlashDL", ...).   
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.004ms returns 0x00  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_ExecCommand("ExcludeFlashCacheRange 0x0-0xFFFFFFFF", ...).   
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.006ms returns 0x00  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_SetHookUnsecureDialog  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_SetHookUnsecureDialog(...)
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.005ms returns 0  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_TIF_Select(JLINKARM_TIF_SWD)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.608ms returns 0x00  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_GetSpeedInfo()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - 128000000 Hz / n, n >= 64
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.006ms   
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Connected emulator supports SWD speeds up to 2000kHz
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_SetSpeed(2000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.074ms   
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_GetSpeed()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.008ms returns 2000  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - SWD clock set to 2000kHz
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_GetSN()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.002ms returns 1050357465  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.003ms   
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - read_device_family
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - read_device_family
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_IsOpen()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.002ms returns 0x01  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_Lock()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - read_debug_port_idr
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - read_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_read_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - coresight_configure
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_GetHWStatus(...)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.251ms returns 0  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_Configure()  
[2026-Aug-25 11:47:24] [error] [ Client] - Encountered error -102: Command connect_to_emu_with_snr executed for 232 milliseconds with result -102
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 102.008ms returns 0  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - read_debug_port_idr
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - read_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_read_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_select_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Select AP 255, DP Bank 0, AP Bank 255
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.747ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.605ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.494ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.567ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.521ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.513ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.573ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.438ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.543ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.502ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.455ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.460ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.544ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.557ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.570ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.439ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.610ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.602ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.540ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.582ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.509ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.506ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.449ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.511ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.436ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.522ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.501ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.537ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.455ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.448ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.446ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.539ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.465ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.486ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.467ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.478ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.515ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.513ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.478ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.534ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.496ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.457ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.036ms   
[2026-Aug-25 11:47:24] [error] [ Worker] - An unknown error.
[2026-Aug-25 11:47:24] [trace] [ Worker] - Command connect_to_emu_with_snr executed for 228 milliseconds with result -102
[2026-Aug-25 11:47:24] [debug] [  nRFXX] - close
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_emu
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_IsOpen()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.004ms returns 0x01  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_Lock()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - close
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - disconnect_from_emu
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_disconnect_from_emu
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - is_connected_to_device
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_IsConnected()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.003ms returns FALSE  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_is_debug_region_powered
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_read_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_select_debug_port_register
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Select AP 255, DP Bank 0, AP Bank 255
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.484ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.465ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.501ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.494ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.549ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.487ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.549ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.564ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.505ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.462ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.587ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.462ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.534ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.522ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.452ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.479ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.532ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.616ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.487ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.658ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.471ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.610ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:24] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.534ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:24] [trace] [  JLink] - - 0.447ms returns -1  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:24] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.491ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.487ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.602ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.539ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.601ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:25] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.490ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.460ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.462ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.513ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.511ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.445ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [ Client] - Command close executed for 56 milliseconds with result 0
[2026-Aug-25 11:47:25] [debug] [ Client] - terminate
[2026-Aug-25 11:47:25] [trace] [ Client] - Command terminate executed for 0 milliseconds with result 0
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.478ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [debug] [SeggerBackend] - ---just_abort_debug_action
[2026-Aug-25 11:47:25] [debug] [SeggerBackend] - Attempting to clear any configuration errors in debug port before closing connection. 
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.495ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.470ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.514ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.569ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.466ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)  
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.549ms returns -1  
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_HasError()  
[2026-Aug-25 11:47:25] [debug] [SeggerBackend] - Ignore exception An unknown error.
[2026-Aug-25 11:47:25] [trace] [  JLink] - - 0.034ms   
[2026-Aug-25 11:47:25] [trace] [  JLink] - JLINK_Close()  
[2026-Aug-25 11:47:25] [debug] [SeggerBackend] - Segger Backend closed.
[2026-Aug-25 11:47:25] [debug] [  nRFXX] - nRF family DLL closed
[2026-Aug-25 11:47:25] [trace] [ Worker] - Command close executed for 45 milliseconds with result 0
[2026-Aug-25 11:47:25] [trace] [ Worker] - Command terminate executed for 0 milliseconds with result 0
[2026-Aug-25 11:47:25] [trace] [ Worker] - Executed 6 commands for 280 milliseconds
[2026-Aug-25 11:47:25] [debug] [ Client] - Worker process exited with code: 0
[2026-Aug-25 11:47:25] [debug] [ Client] - Worker process exited with code: 0
[2026-Aug-25 11:47:25] [debug] [ Client] - Child process terminated with result 0
[2026-Aug-25 11:47:25] [trace] [ Client] - Executed 6 commands for 393 milliseconds
[2026-Aug-25 11:47:25] [debug] [ Client] - terminate

Questions:

1. When using a PCA10040 kit equipped with the nRF5340-based interface MCU to debug an external nRF52832 target, does the cross-family CoreSight mapping require a specific configuration or command line override?

2. What could be causing the JLINK_CORESIGHT_WriteAPDPReg function to return -1 during the target connection handshake?

Any guidance would be greatly appreciated!

[krf]

Also : 

DEC3 pin is at 3V

DEC2 is at 1.26V

DEC4 is at 1.26V

DEC1 is at 1.09V 

when i supply VDD pins with 3V

[PaKa]

There are several more lines needed to program external targets, have you added all these? You can see which ones in the DK HW user guide. All lines listed are required, not only the 2 SWD lines.

[krf]

 PaKa Yes i did and specified it in my question. VTG, SWDIO, SWCLK, RESET, GND , VDD. Also i tried both - external supply for custom board and supply from nrf52 dk VDD.

[krf]

İ verified that if i left VTG unconnected onboard nrf52832 flashed otherwise P19 or P20 selected. I left unconnected p19 and suspect about it. Somehow P19 can be selected? I use P20 connector

[Håkon Alseth]

Hi,

 

The errors you are seeing points towards a incorrect connection to the external board.

krf said:

DEC3 pin is at 3V

DEC2 is at 1.26V

DEC4 is at 1.26V

DEC1 is at 1.09V 

These are all within the expected area, assuming VDD=3.0V.

 

Q1: Can you please share a picture on how you've setup the connection from DK to custom board?

Q2: Does this occur on more than one board?

 

Kind regards,

Håkon