J-link EDU mini can't connect to nRF52840

RE: J-link EDU mini can't connect to nRF52840

Kageni — Thu, 03 Jun 2021 20:43:36 GMT

Hey I tried it on a different sample and it works! It seems like this was just a bad module. Thanks for your help!

RE: J-link EDU mini can't connect to nRF52840

Jared — Tue, 01 Jun 2021 07:36:31 GMT

If the pin is used as a reset pin than an internal pull-up will be activated, so the pin should be logical high. Could you try pulling up the pin externally and see if you're able to connect to the device?

Also, how many samples are you seeing this issue on? What percentage?

RE: J-link EDU mini can't connect to nRF52840

Kageni — Mon, 31 May 2021 16:18:38 GMT

What should the voltage be measuring on the reset pin? It isn't grounded out as I don't measure continuity with ground on the reset pin unless the physical reset button is depressed. I have attached a picture of the pcb file which shows just a short lead from the reset button to the reset pin.

RE: J-link EDU mini can't connect to nRF52840

Jared — Mon, 31 May 2021 07:54:28 GMT

The reset pin is active low which means that if you measure 0V or lower than the nRF is held in a reset state. You need to check if anything is pulling the pin down externally.

RE: J-link EDU mini can't connect to nRF52840

Kageni — Sun, 30 May 2021 20:06:16 GMT

It is difficult to measure any of the DEC pins directly on the chip as they connect underneath the chip itself. I can access the reset pin on the module and it is reading 0V with negative point of volt meter on ground.

RE: J-link EDU mini can't connect to nRF52840

Jared — Fri, 28 May 2021 09:15:47 GMT

What voltage do you measure on the RESET, and DEC pins? Measure directly on the pin

RE: J-link EDU mini can't connect to nRF52840

Kageni — Thu, 27 May 2021 14:26:56 GMT

Board is connected to USB and showing 3.3V volts at 3V3. I tried to run nrfjprog and this is the log.

[2021-May-27 04:22:46] [ info] --------------------------------------------------------------------------------
[2021-May-27 04:22:46] [ info] C:\Program Files (x86)\Nordic Semiconductor\nrf-command-line-tools\bin\nrfjprog.exe --recover --log
[2021-May-27 04:22:46] [ info] nrfjprog version 10.12.1
[2021-May-27 04:22:46] [ info] --------------------------------------------------------------------------------
[2021-May-27 04:22:46] [debug] [ nRF0x0] - open_dll
[2021-May-27 04:22:46] [ info] [ nRF0x0] - Load library at C:\Program Files (x86)\Nordic Semiconductor\nrf-command-line-tools\bin\JLINKARM_UNKNOWN_NRFJPROG.dll.
[2021-May-27 04:22:46] [ info] [ nRF0x0] - Library loaded, loading member functions.
[2021-May-27 04:22:46] [ info] [ nRF0x0] - Member functions succesfully loaded.
[2021-May-27 04:22:46] [ info] [Backend] - Logger callback at 0xab2020 registered in Segger backend logger.
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Logger callback at 0xab2020 registered in JLink logger.
[2021-May-27 04:22:46] [debug] [nRFUnknown] - Just_open_dll_tagged_callback
[2021-May-27 04:22:46] [debug] [Backend] - open_dll
[2021-May-27 04:22:46] [ info] [Backend] - No J-Link DLL path was provided. Attempting to auto detect.
[2021-May-27 04:22:46] [ info] [Backend] - Load library at C:\Program Files (x86)\SEGGER\JLink\JLinkARM.dll.
[2021-May-27 04:22:46] [ info] [Backend] - Library loaded, loading member functions.
[2021-May-27 04:22:46] [ info] [Backend] - Member functions succesfully loaded.
[2021-May-27 04:22:46] [debug] [Backend] - dll_version
[2021-May-27 04:22:46] [ info] [Backend] - Segger dll version 7.20. loaded.
[2021-May-27 04:22:46] [debug] [Backend] - set_core_data
[2021-May-27 04:22:46] [debug] [ nRF0x0] - enum_emu_snr
[2021-May-27 04:22:46] [debug] [nRFUnknown] - Just_enum_emu_snr
[2021-May-27 04:22:46] [debug] [Backend] - enum_emu_snr
[2021-May-27 04:22:46] [debug] [Backend] - ---just_enum_emu_snr
[2021-May-27 04:22:46] [debug] [Backend] - ---just_get_num_emus
[2021-May-27 04:22:46] [debug] [ nRF0x0] - connect_to_emu_with_snr
[2021-May-27 04:22:46] [debug] [nRFUnknown] - Just_connect_to_emu_with_snr
[2021-May-27 04:22:46] [debug] [Backend] - connect_to_emu_with_snr
[2021-May-27 04:22:46] [debug] [Backend] - is_connected_to_emu
[2021-May-27 04:22:46] [debug] [Backend] - ---just_enum_emu_snr
[2021-May-27 04:22:46] [debug] [Backend] - ---just_get_num_emus
[2021-May-27 04:22:46] [debug] [Backend] - ---just_connect_to_emu_with_snr
[2021-May-27 04:22:46] [debug] [Backend] - ---just_connect_to_emu_without_snr
[2021-May-27 04:22:46] [ info] [Backend] - Segger logging enabled.
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Firmware: J-Link EDU Mini V1 compiled Feb 18 2021 11:25:23
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Firmware: J-Link EDU Mini V1 compiled Feb 18 2021 11:25:23
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Decompressing FW timestamp took 115 us
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Hardware: V1.00
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] S/N: 801032241
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] OEM: SEGGER
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Feature(s): FlashBP, GDB
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Looking for J-Link GUI Server exe at: C:\Program Files (x86)\SEGGER\JLink\JLinkGUIServer.exe
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] Forking J-Link GUI Server: C:\Program Files (x86)\SEGGER\JLink\JLinkGUIServer.exe
[2021-May-27 04:22:46] [ info] [ JLink] - [Info    ] [JLink     ] J-Link GUI Server info: "J-Link GUI server V7.20 "
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] TELNET listener socket opened on port 19021
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] WEBSRV Starting webserver
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] WEBSRV Webserver running on local port 19080
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 3119.851ms returns "O.K."
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_GetHWStatus(...)
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.353ms returns 0
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_ExecCommand("SetRestartOnClose = 0", ...).
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.291ms returns 0x01
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_ExecCommand("DisableFlashDL", ...).
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.010ms returns 0x00
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_ExecCommand("ExcludeFlashCacheRange 0x0-0xFFFFFFFF", ...).
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.244ms returns 0x00
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_SetHookUnsecureDialog
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_SetHookUnsecureDialog(...)
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.187ms returns 0
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_TIF_Select(JLINKARM_TIF_SWD)
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.692ms returns 0x00
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_SetSpeed(2000)
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.302ms
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_GetSN()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.012ms returns 801032241
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [debug] [Backend] - ---just_load_core_data
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_ExecCommand("CORESIGHT_SetIndexAHBAPToUse = 0", ...).
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.003ms returns 0x00
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_ExecCommand("device = Cortex-M4", ...).
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] XML file found at: C:\Program Files (x86)\SEGGER\JLink\JLinkDevices.xml
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] C:\Program Files (x86)\SEGGER\JLink\JLinkDevices.xml evaluated successfully.
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] Device "CORTEX-M4" selected.
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] Device "CORTEX-M4" selected.
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 63.229ms returns 0x00
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [debug] [ nRF0x0] - read_connected_emu_snr
[2021-May-27 04:22:49] [debug] [nRFUnknown] - Just_read_connected_emu_snr
[2021-May-27 04:22:49] [debug] [Backend] - read_connected_emu_snr
[2021-May-27 04:22:49] [debug] [Backend] - is_connected_to_emu
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_IsOpen()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.074ms returns 0x01
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [debug] [ nRF0x0] - read_device_family
[2021-May-27 04:22:49] [debug] [nRFUnknown] - Just_read_device_family
[2021-May-27 04:22:49] [debug] [Backend] - is_connected_to_emu
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_IsOpen()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] - 0.012ms returns 0x01
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_Lock()
[2021-May-27 04:22:49] [debug] [Backend] - read_debug_port_idr
[2021-May-27 04:22:49] [debug] [Backend] - read_debug_port_register
[2021-May-27 04:22:49] [debug] [Backend] - ---just_read_debug_port_register
[2021-May-27 04:22:49] [debug] [Backend] - coresight_configure
[2021-May-27 04:22:49] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_CORESIGHT_Configure()
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 100.089ms returns 0
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [debug] [Backend] - ---just_select_debug_port_register
[2021-May-27 04:22:50] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.514ms returns -1
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-27 04:22:50] [debug] [Backend] - ---just_abort_debug_action
[2021-May-27 04:22:50] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.492ms returns -1
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.039ms
[2021-May-27 04:22:50] [debug] [ nRF0x0] - close_dll
[2021-May-27 04:22:50] [debug] [nRFUnknown] - Just_close_dll
[2021-May-27 04:22:50] [debug] [Backend] - close
[2021-May-27 04:22:50] [debug] [Backend] - disconnect_from_emu
[2021-May-27 04:22:50] [debug] [Backend] - is_connected_to_emu
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_IsOpen()
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.014ms returns 0x01
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [debug] [Backend] - ---just_disconnect_from_emu
[2021-May-27 04:22:50] [debug] [Backend] - is_connected_to_device
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_IsConnected()
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.013ms returns FALSE
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [debug] [Backend] - ---just_is_debug_region_powered
[2021-May-27 04:22:50] [debug] [Backend] - ---just_read_debug_port_register
[2021-May-27 04:22:50] [debug] [Backend] - is_connected_to_emu
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_IsOpen()
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.012ms returns 0x01
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_Lock()
[2021-May-27 04:22:50] [debug] [Backend] - ---just_select_debug_port_register
[2021-May-27 04:22:50] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.552ms returns -1
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-27 04:22:50] [debug] [Backend] - ---just_abort_debug_action
[2021-May-27 04:22:50] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.475ms returns -1
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_HasError()
[2021-May-27 04:22:50] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] - 0.044ms
[2021-May-27 04:22:50] [ info] [ JLink] - [Info    ] [JLink     ] JLINK_Close()
[2021-May-27 04:22:50] [debug] [Backend] - Segger Backend closed.

RE: J-link EDU mini can't connect to nRF52840

Jared — Thu, 27 May 2021 08:58:42 GMT

[quote user="Kageni"]Hi I have the 3V3, SWDIO, SWCLK, and ground coming off the board with a 4 pin header. I connected 3V3 -> Vref, SWDIO -> SWIO, SWCLK ->CLK, and GND -> GNDP[/quote]

Ok perfect, in addition to this you need to make sure the board is supplied externally while trying to connect to it.

RE: J-link EDU mini can't connect to nRF52840

Kageni — Wed, 26 May 2021 23:47:47 GMT

[quote userid="73165" url="~/f/nordic-q-a/75581/j-link-edu-mini-can-t-connect-to-nrf52840/311812#311812"]

Hi,

I don't have any experience with this module, nor can I prove that it's actually a real one. We have seen that people have bought non-legit from sites such as Alibaba and Ebay and then have connection issues.

Nevertheless,

Assuming that it's actually a real nRF inside:

For SWD to work you need to route out the:

VCC
SWDIO
SWDCLK
RESET(optional)

You also need to make sure that the nRF is supplied when you try to debug. It seems that you are supplying the nRF 3V3 via the debug interface, but I can't see where the supply is connected to the debugger?

regards

Jared

[/quote]

Hi I have the 3V3, SWDIO, SWCLK, and ground coming off the board with a 4 pin header. I connected 3V3 -> Vref, SWDIO -> SWIO, SWCLK ->CLK, and GND -> GNDP

RE: J-link EDU mini can't connect to nRF52840

Jared — Wed, 26 May 2021 12:58:41 GMT

Hi,

Nevertheless,

Assuming that it's actually a real nRF inside:

For SWD to work you need to route out the:

VCC
SWDIO
SWDCLK
RESET(optional)

regards

Jared

RE: J-link EDU mini can't connect to nRF52840

Kageni — Tue, 25 May 2021 16:52:30 GMT

[2021-May-25 06:49:05] [ info] --------------------------------------------------------------------------------
[2021-May-25 06:49:05] [ info] C:\Program Files (x86)\Nordic Semiconductor\nrf-command-line-tools\bin\nrfjprog.exe --recover --log
[2021-May-25 06:49:05] [ info] nrfjprog version 10.12.1
[2021-May-25 06:49:05] [ info] --------------------------------------------------------------------------------
[2021-May-25 06:49:05] [debug] [ nRF0x0] - open_dll
[2021-May-25 06:49:05] [ info] [ nRF0x0] - Load library at C:\Program Files (x86)\Nordic Semiconductor\nrf-command-line-tools\bin\JLINKARM_UNKNOWN_NRFJPROG.dll.
[2021-May-25 06:49:05] [ info] [ nRF0x0] - Library loaded, loading member functions.
[2021-May-25 06:49:05] [ info] [ nRF0x0] - Member functions succesfully loaded.
[2021-May-25 06:49:05] [ info] [Backend] - Logger callback at 0xa02020 registered in Segger backend logger.
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Logger callback at 0xa02020 registered in JLink logger.
[2021-May-25 06:49:05] [debug] [nRFUnknown] - Just_open_dll_tagged_callback
[2021-May-25 06:49:05] [debug] [Backend] - open_dll
[2021-May-25 06:49:05] [ info] [Backend] - No J-Link DLL path was provided. Attempting to auto detect.
[2021-May-25 06:49:05] [ info] [Backend] - Load library at C:\Program Files (x86)\SEGGER\JLink\JLinkARM.dll.
[2021-May-25 06:49:05] [ info] [Backend] - Library loaded, loading member functions.
[2021-May-25 06:49:05] [ info] [Backend] - Member functions succesfully loaded.
[2021-May-25 06:49:05] [debug] [Backend] - dll_version
[2021-May-25 06:49:05] [ info] [Backend] - Segger dll version 7.20. loaded.
[2021-May-25 06:49:05] [debug] [Backend] - set_core_data
[2021-May-25 06:49:05] [debug] [ nRF0x0] - enum_emu_snr
[2021-May-25 06:49:05] [debug] [nRFUnknown] - Just_enum_emu_snr
[2021-May-25 06:49:05] [debug] [Backend] - enum_emu_snr
[2021-May-25 06:49:05] [debug] [Backend] - ---just_enum_emu_snr
[2021-May-25 06:49:05] [debug] [Backend] - ---just_get_num_emus
[2021-May-25 06:49:05] [debug] [ nRF0x0] - connect_to_emu_with_snr
[2021-May-25 06:49:05] [debug] [nRFUnknown] - Just_connect_to_emu_with_snr
[2021-May-25 06:49:05] [debug] [Backend] - connect_to_emu_with_snr
[2021-May-25 06:49:05] [debug] [Backend] - is_connected_to_emu
[2021-May-25 06:49:05] [debug] [Backend] - ---just_enum_emu_snr
[2021-May-25 06:49:05] [debug] [Backend] - ---just_get_num_emus
[2021-May-25 06:49:05] [debug] [Backend] - ---just_connect_to_emu_with_snr
[2021-May-25 06:49:05] [debug] [Backend] - ---just_connect_to_emu_without_snr
[2021-May-25 06:49:05] [ info] [Backend] - Segger logging enabled.
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Firmware: J-Link EDU Mini V1 compiled Feb 18 2021 11:25:23
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Firmware: J-Link EDU Mini V1 compiled Feb 18 2021 11:25:23
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Decompressing FW timestamp took 122 us
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Hardware: V1.00
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] S/N: 801032241
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] OEM: SEGGER
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Feature(s): FlashBP, GDB
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Looking for J-Link GUI Server exe at: C:\Program Files (x86)\SEGGER\JLink\JLinkGUIServer.exe
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] Forking J-Link GUI Server: C:\Program Files (x86)\SEGGER\JLink\JLinkGUIServer.exe
[2021-May-25 06:49:05] [ info] [ JLink] - [Info ] [JLink ] J-Link GUI Server info: "J-Link GUI server V7.20 "
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] TELNET listener socket opened on port 19021
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] WEBSRV Starting webserver
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] WEBSRV Webserver running on local port 19080
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 2258.729ms returns "O.K."
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_GetHWStatus(...)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.160ms returns 0
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("SetRestartOnClose = 0", ...).
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.012ms returns 0x01
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("DisableFlashDL", ...).
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.006ms returns 0x00
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("ExcludeFlashCacheRange 0x0-0xFFFFFFFF", ...).
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.005ms returns 0x00
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetHookUnsecureDialog
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetHookUnsecureDialog(...)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.027ms returns 0
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_TIF_Select(JLINKARM_TIF_SWD)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.408ms returns 0x00
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_SetSpeed(2000)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.066ms
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_GetSN()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.011ms returns 801032241
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [debug] [Backend] - ---just_load_core_data
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("CORESIGHT_SetIndexAHBAPToUse = 0", ...).
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.004ms returns 0x00
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_ExecCommand("device = Cortex-M4", ...).
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] XML file found at: C:\Program Files (x86)\SEGGER\JLink\JLinkDevices.xml
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] C:\Program Files (x86)\SEGGER\JLink\JLinkDevices.xml evaluated successfully.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] Device "CORTEX-M4" selected.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] Device "CORTEX-M4" selected.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 45.747ms returns 0x00
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [debug] [ nRF0x0] - read_connected_emu_snr
[2021-May-25 06:49:07] [debug] [nRFUnknown] - Just_read_connected_emu_snr
[2021-May-25 06:49:07] [debug] [Backend] - read_connected_emu_snr
[2021-May-25 06:49:07] [debug] [Backend] - is_connected_to_emu
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.068ms returns 0x01
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [debug] [ nRF0x0] - read_device_family
[2021-May-25 06:49:07] [debug] [nRFUnknown] - Just_read_device_family
[2021-May-25 06:49:07] [debug] [Backend] - is_connected_to_emu
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.012ms returns 0x01
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_Lock()
[2021-May-25 06:49:07] [debug] [Backend] - read_debug_port_idr
[2021-May-25 06:49:07] [debug] [Backend] - read_debug_port_register
[2021-May-25 06:49:07] [debug] [Backend] - ---just_read_debug_port_register
[2021-May-25 06:49:07] [debug] [Backend] - coresight_configure
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_Configure()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 99.902ms returns 0
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [debug] [Backend] - ---just_select_debug_port_register
[2021-May-25 06:49:07] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.528ms returns -1
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-25 06:49:07] [debug] [Backend] - ---just_abort_debug_action
[2021-May-25 06:49:07] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.501ms returns -1
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.038ms
[2021-May-25 06:49:07] [debug] [ nRF0x0] - close_dll
[2021-May-25 06:49:07] [debug] [nRFUnknown] - Just_close_dll
[2021-May-25 06:49:07] [debug] [Backend] - close
[2021-May-25 06:49:07] [debug] [Backend] - disconnect_from_emu
[2021-May-25 06:49:07] [debug] [Backend] - is_connected_to_emu
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.014ms returns 0x01
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [debug] [Backend] - ---just_disconnect_from_emu
[2021-May-25 06:49:07] [debug] [Backend] - is_connected_to_device
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsConnected()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.013ms returns FALSE
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [debug] [Backend] - ---just_is_debug_region_powered
[2021-May-25 06:49:07] [debug] [Backend] - ---just_read_debug_port_register
[2021-May-25 06:49:07] [debug] [Backend] - is_connected_to_emu
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_IsOpen()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.013ms returns 0x01
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_Lock()
[2021-May-25 06:49:07] [debug] [Backend] - ---just_select_debug_port_register
[2021-May-25 06:49:07] [debug] [Backend] - Select AP 255, DP Bank 0, AP Bank 255
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.484ms returns -1
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-25 06:49:07] [debug] [Backend] - ---just_abort_debug_action
[2021-May-25 06:49:07] [ info] [Backend] - Attempting to clear any configuration errors in debug port before closing connection.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.517ms returns -1
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_HasError()
[2021-May-25 06:49:07] [ info] [Backend] - JLinkARM.dll reported "-1", an unknown error.
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] - 0.039ms
[2021-May-25 06:49:07] [ info] [ JLink] - [Info ] [JLink ] JLINK_Close()
[2021-May-25 06:49:07] [debug] [Backend] - Segger Backend closed.

RE: J-link EDU mini can't connect to nRF52840

Kageni — Tue, 25 May 2021 14:55:13 GMT

VTreg is getting 3.3V when measured between that and the ground pin.