Hello,
Our custom board (nrf52832, S132) seem enter to the read back protection, J-Link could not connect to the target in any ways.
We tried the command "nrfjprog --recover" to fix it. However, the " JLinkARM DLL reported an error" still happened.
Here is my information and error log:
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[2021-Jan-15 17:02:25] [ info] --------------------------------------------------------------------------------
[2021-Jan-15 17:02:25] [ info] nrfjprog.exe -r --log
[2021-Jan-15 17:02:25] [ info] nrfjprog version 10.12.1
[2021-Jan-15 17:02:25] [ info] --------------------------------------------------------------------------------
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - open_dll
[2021-Jan-15 17:02:25] [ info] [ nRF0x0] - Load library at C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin\JLINKARM_UNKNOWN_NRFJPROG.dll.
[2021-Jan-15 17:02:25] [ info] [ nRF0x0] - Library loaded, loading member functions.
[2021-Jan-15 17:02:25] [ info] [ nRF0x0] - Member functions succesfully loaded.
[2021-Jan-15 17:02:25] [ info] [Backend] - Logger callback at 0x7ff76a9f56f0 registered in Segger backend logger.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Logger callback at 0x7ff76a9f56f0 registered in JLink logger.
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_open_dll_tagged_callback
[2021-Jan-15 17:02:25] [debug] [Backend] - open_dll
[2021-Jan-15 17:02:25] [ info] [Backend] - No J-Link DLL path was provided. Attempting to auto detect.
[2021-Jan-15 17:02:25] [ info] [Backend] - Load library at C:\Program Files (x86)\SEGGER\JLink\JLink_x64.dll.
[2021-Jan-15 17:02:25] [ info] [Backend] - Library loaded, loading member functions.
[2021-Jan-15 17:02:25] [ info] [Backend] - Member functions succesfully loaded.
[2021-Jan-15 17:02:25] [debug] [Backend] - dll_version
[2021-Jan-15 17:02:25] [ info] [Backend] - Segger dll version 6.94. loaded.
[2021-Jan-15 17:02:25] [debug] [Backend] - set_core_data
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - enum_emu_snr
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_enum_emu_snr
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
[2021-Jan-15 17:02:25] [ info] --------------------------------------------------------------------------------
[2021-Jan-15 17:02:25] [ info] nrfjprog.exe -r --log
[2021-Jan-15 17:02:25] [ info] nrfjprog version 10.12.1
[2021-Jan-15 17:02:25] [ info] --------------------------------------------------------------------------------
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - open_dll
[2021-Jan-15 17:02:25] [ info] [ nRF0x0] - Load library at C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin\JLINKARM_UNKNOWN_NRFJPROG.dll.
[2021-Jan-15 17:02:25] [ info] [ nRF0x0] - Library loaded, loading member functions.
[2021-Jan-15 17:02:25] [ info] [ nRF0x0] - Member functions succesfully loaded.
[2021-Jan-15 17:02:25] [ info] [Backend] - Logger callback at 0x7ff76a9f56f0 registered in Segger backend logger.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Logger callback at 0x7ff76a9f56f0 registered in JLink logger.
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_open_dll_tagged_callback
[2021-Jan-15 17:02:25] [debug] [Backend] - open_dll
[2021-Jan-15 17:02:25] [ info] [Backend] - No J-Link DLL path was provided. Attempting to auto detect.
[2021-Jan-15 17:02:25] [ info] [Backend] - Load library at C:\Program Files (x86)\SEGGER\JLink\JLink_x64.dll.
[2021-Jan-15 17:02:25] [ info] [Backend] - Library loaded, loading member functions.
[2021-Jan-15 17:02:25] [ info] [Backend] - Member functions succesfully loaded.
[2021-Jan-15 17:02:25] [debug] [Backend] - dll_version
[2021-Jan-15 17:02:25] [ info] [Backend] - Segger dll version 6.94. loaded.
[2021-Jan-15 17:02:25] [debug] [Backend] - set_core_data
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - enum_emu_snr
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_enum_emu_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - enum_emu_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_enum_emu_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_get_num_emus
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - connect_to_emu_with_snr
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_connect_to_emu_with_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - connect_to_emu_with_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - is_connected_to_emu
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_enum_emu_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_get_num_emus
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_connect_to_emu_with_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_connect_to_emu_without_snr
[2021-Jan-15 17:02:25] [ info] [Backend] - Segger logging enabled.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Firmware: J-Link V9 compiled Dec 13 2019 11:14:50
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Decompressing FW timestamp took 122 us
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Hardware: V9.60
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] S/N: 69619640
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] OEM: SEGGER
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Feature(s): RDI, GDB, FlashDL, FlashBP, JFlash
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] EMU: Cleaned up zombie connection 0. PID: 0x3168 (12648)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] TELNET listener socket opened on port 19021
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] WEBSRV Starting webserver
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] WEBSRV Webserver running on local port 19080
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 18.876ms returns "O.K."
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_GetHWStatus(...)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.107ms returns 0
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("SetRestartOnClose = 0", ...).
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.009ms returns 0x01
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("DisableFlashDL", ...).
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.005ms returns 0x00
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("ExcludeFlashCacheRange 0x0-0xFFFFFFFF", ...).
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.004ms returns 0x00
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetHookUnsecureDialog
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetHookUnsecureDialog(...)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.020ms returns 0
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_TIF_Select(JLINKARM_TIF_SWD)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.353ms returns 0x00
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetSpeed(2000)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.047ms
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_GetSN()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.008ms returns 69619640
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_load_core_data
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("CORESIGHT_SetIndexAHBAPToUse = 0", ...).
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.004ms returns 0x00
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("device = Cortex-M4", ...).
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] XML file found at: C:\Program Files (x86)\SEGGER\JLink\JLinkDevices.xml
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] C:\Program Files (x86)\SEGGER\JLink\JLinkDevices.xml evaluated successfully.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Device "CORTEX-M4" selected.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] Device "CORTEX-M4" selected.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 104.073ms returns 0x00
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - read_connected_emu_snr
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_read_connected_emu_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - read_connected_emu_snr
[2021-Jan-15 17:02:25] [debug] [Backend] - is_connected_to_emu
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.008ms returns 0x01
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - read_device_family
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_read_device_family
[2021-Jan-15 17:02:25] [debug] [Backend] - is_connected_to_emu
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.006ms returns 0x01
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_Lock()
[2021-Jan-15 17:02:25] [debug] [Backend] - read_debug_port_idr
[2021-Jan-15 17:02:25] [debug] [Backend] - read_debug_port_register
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_read_debug_port_register
[2021-Jan-15 17:02:25] [debug] [Backend] - coresight_configure
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_Configure()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 100.775ms returns 0
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_select_debug_port_register
[2021-Jan-15 17:02:25] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.540ms returns -1
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_abort_debug_action
[2021-Jan-15 17:02:25] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.463ms returns -1
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.030ms
[2021-Jan-15 17:02:25] [debug] [ nRF0x0] - close_dll
[2021-Jan-15 17:02:25] [debug] [nRFUnknown] - Just_close_dll
[2021-Jan-15 17:02:25] [debug] [Backend] - close
[2021-Jan-15 17:02:25] [debug] [Backend] - disconnect_from_emu
[2021-Jan-15 17:02:25] [debug] [Backend] - is_connected_to_emu
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.043ms returns 0x01
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_disconnect_from_emu
[2021-Jan-15 17:02:25] [debug] [Backend] - is_connected_to_device
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsConnected()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.020ms returns FALSE
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_is_debug_region_powered
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_read_debug_port_register
[2021-Jan-15 17:02:25] [debug] [Backend] - is_connected_to_emu
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.006ms returns 0x01
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_Lock()
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_select_debug_port_register
[2021-Jan-15 17:02:25] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.489ms returns -1
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Jan-15 17:02:25] [debug] [Backend] - ---just_abort_debug_action
[2021-Jan-15 17:02:25] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.523ms returns -1
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-Jan-15 17:02:25] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] - 0.027ms
[2021-Jan-15 17:02:25] [ info] [ JLink] - [Info ] [JLink ] JLINK_Close()
[2021-Jan-15 17:02:25] [debug] [Backend] - Segger Backend closed.
Can anybody helo me, please!!!???