Hi,
I'm testing a custom board, based on nrf52832_xxab SoC, with a SWD interface. The board was working fine, but suddenly the debugging interface stopped working. Any idea of what is happening?
Trying to use JLinkExe:
SEGGER J-Link Commander V6.88a (Compiled Nov 18 2020 16:08:22) DLL version V6.88a, compiled Nov 18 2020 16:08:10 Connecting to J-Link via USB...O.K. Firmware: J-Link V9 compiled Dec 13 2019 11:14:50 Hardware version: V9.30 S/N: 269306653 License(s): FlashBP, GDB OEM: SEGGER-EDU VTref=2.002V Type "connect" to establish a target connection, '?' for help J-Link>connect Device "NRF52832_XXAB" 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>
Trying to read the SoC memory with nRF Connect Desktop:
Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4) Lowlevel error: JLINKARM_DLL_ERROR (ffffff9a)
Trying nrfjprog -e:
[2021-Feb-18 14:24:44] [ info] --------------------------------------------------------------------------------
[2021-Feb-18 14:24:44] [ info] nrfjprog -e --log
[2021-Feb-18 14:24:44] [ info] nrfjprog version 10.12.1
[2021-Feb-18 14:24:44] [ info] --------------------------------------------------------------------------------
[2021-Feb-18 14:24:44] [debug] [ nRF0x0] - open_dll
[2021-Feb-18 14:24:44] [ info] [ nRF0x0] - Load library at /opt/nrfjprog/libjlinkarm_unknown_nrfjprogdll.so.
[2021-Feb-18 14:24:44] [ info] [ nRF0x0] - Library loaded, loading member functions.
[2021-Feb-18 14:24:44] [ info] [ nRF0x0] - Member functions succesfully loaded.
[2021-Feb-18 14:24:44] [ info] [Backend] - Logger callback at 0x55ec264e8130 registered in Segger backend logger.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Logger callback at 0x55ec264e8130 registered in JLink logger.
[2021-Feb-18 14:24:44] [debug] [nRFUnknown] - Just_open_dll_tagged_callback
[2021-Feb-18 14:24:44] [debug] [Backend] - open_dll
[2021-Feb-18 14:24:44] [ info] [Backend] - No J-Link DLL path was provided. Attempting to auto detect.
[2021-Feb-18 14:24:44] [ info] [Backend] - Load library at /opt/SEGGER/JLink/libjlinkarm.so.
[2021-Feb-18 14:24:44] [ info] [Backend] - Library loaded, loading member functions.
[2021-Feb-18 14:24:44] [ info] [Backend] - Member functions succesfully loaded.
[2021-Feb-18 14:24:44] [debug] [Backend] - dll_version
[2021-Feb-18 14:24:44] [ info] [Backend] - Segger dll version 6.88.a loaded.
[2021-Feb-18 14:24:44] [debug] [Backend] - set_core_data
[2021-Feb-18 14:24:44] [debug] [ nRF0x0] - enum_emu_snr
[2021-Feb-18 14:24:44] [debug] [nRFUnknown] - Just_enum_emu_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - enum_emu_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_enum_emu_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_get_num_emus
[2021-Feb-18 14:24:44] [debug] [ nRF0x0] - connect_to_emu_with_snr
[2021-Feb-18 14:24:44] [debug] [nRFUnknown] - Just_connect_to_emu_with_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - connect_to_emu_with_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - is_connected_to_emu
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_enum_emu_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_get_num_emus
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_connect_to_emu_with_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_connect_to_emu_without_snr
[2021-Feb-18 14:24:44] [ info] [Backend] - Segger logging enabled.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Firmware: J-Link V9 compiled Dec 13 2019 11:14:50
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Decompressing FW timestamp took 182 us
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Hardware: V9.30
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] S/N: 269306653
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] OEM: SEGGER-EDU
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Feature(s): FlashBP, GDB
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] TELNET listener socket opened on port 19021
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] WEBSRV Starting webserver
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] WEBSRV Webserver running on local port 19080
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 74.727ms returns "O.K."
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_GetHWStatus(...)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 2.708ms returns 0
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("SetRestartOnClose = 0", ...).
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.003ms returns 0x01
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("DisableFlashDL", ...).
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.002ms returns 0x00
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("ExcludeFlashCacheRange 0x0-0xFFFFFFFF", ...).
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.003ms returns 0x00
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetHookUnsecureDialog
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetHookUnsecureDialog(...)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.012ms returns 0
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_TIF_Select(JLINKARM_TIF_SWD)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 10.797ms returns 0x00
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetSpeed(2000)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 3.069ms
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_GetSN()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.009ms returns 269306653
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_load_core_data
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("CORESIGHT_SetIndexAHBAPToUse = 0", ...).
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.003ms returns 0x00
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("device = Cortex-M4", ...).
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] XML file found at: /opt/SEGGER/JLink/JLinkDevices.xml
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] /opt/SEGGER/JLink/JLinkDevices.xml evaluated successfully.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Device "CORTEX-M4" selected.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] Device "CORTEX-M4" selected.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 12.961ms returns 0x00
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [debug] [ nRF0x0] - read_connected_emu_snr
[2021-Feb-18 14:24:44] [debug] [nRFUnknown] - Just_read_connected_emu_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - read_connected_emu_snr
[2021-Feb-18 14:24:44] [debug] [Backend] - is_connected_to_emu
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.014ms returns 0x01
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [debug] [ nRF0x0] - read_device_family
[2021-Feb-18 14:24:44] [debug] [nRFUnknown] - Just_read_device_family
[2021-Feb-18 14:24:44] [debug] [Backend] - is_connected_to_emu
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.004ms returns 0x01
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_Lock()
[2021-Feb-18 14:24:44] [debug] [Backend] - read_debug_port_idr
[2021-Feb-18 14:24:44] [debug] [Backend] - read_debug_port_register
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_read_debug_port_register
[2021-Feb-18 14:24:44] [debug] [Backend] - coresight_configure
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_Configure()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 100.382ms returns 0
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_select_debug_port_register
[2021-Feb-18 14:24:44] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 3.011ms returns -1
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_abort_debug_action
[2021-Feb-18 14:24:44] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 3.029ms returns -1
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.019ms
[2021-Feb-18 14:24:44] [debug] [ nRF0x0] - close_dll
[2021-Feb-18 14:24:44] [debug] [nRFUnknown] - Just_close_dll
[2021-Feb-18 14:24:44] [debug] [Backend] - close
[2021-Feb-18 14:24:44] [debug] [Backend] - disconnect_from_emu
[2021-Feb-18 14:24:44] [debug] [Backend] - is_connected_to_emu
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.015ms returns 0x01
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_disconnect_from_emu
[2021-Feb-18 14:24:44] [debug] [Backend] - is_connected_to_device
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsConnected()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.008ms returns FALSE
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_is_debug_region_powered
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_read_debug_port_register
[2021-Feb-18 14:24:44] [debug] [Backend] - is_connected_to_emu
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.005ms returns 0x01
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_Lock()
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_select_debug_port_register
[2021-Feb-18 14:24:44] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 2.756ms returns -1
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Feb-18 14:24:44] [debug] [Backend] - ---just_abort_debug_action
[2021-Feb-18 14:24:44] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 2.987ms returns -1
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Feb-18 14:24:44] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] - 0.015ms
[2021-Feb-18 14:24:44] [ info] [ JLink] - [Info ] [JLink ] JLINK_Close()
[2021-Feb-18 14:24:44] [debug] [Backend] - Segger Backend closed.
