RAK815 JLink Commander connect issue

LucRoadrunner · December 21, 2020, 1:27pm

Issue: Jlink Edu Mini can’t connect to RAK815 target. I would like to push a DFU bootloader to nrf52. But I can’t connect to it with the Jlink.Any clue ? Thx, Luc

Setup:RAK815 Jlink Mini EDU SWD connection

Server:

Details:
[2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [ info] [Backend] [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [Backend] [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [debug] [ nRF0x0] [2020-Dec-20 22:42:46] [debug] [nRF520x0] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [ info] [ JLink] - [Info [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] [2020-Dec-20 22:42:46] [debug] [Backend] ] [JLink ] Firmware: J-Link EDU Mini V1 compiled Nov 12 2020 13:31:42
] [JLink ] Decompressing FW timestamp took 114 us
] [JLink ] Hardware: V1.00
] [JLink ] S/N: 801027752
] [JLink ] OEM: SEGGER
] [JLink ] Feature(s): FlashBP, GDB
] [JLink ] TELNET listener socket opened on port 19021
] [JLink ] WEBSRV Starting webserver
] [JLink ] WEBSRV Webserver running on local port 19080
] [JLink ] - 24.856ms returns “O.K.”
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_Lock()
] [JLink ] JLINK_GetHWStatus(…)
] [JLink ] - 0.308ms returns 0
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_ExecCommand(“SetRestartOnClose = 0”, …).
] [JLink ] - 0.003ms returns 0x01
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_ExecCommand(“DisableFlashDL”, …).
] [JLink ] - 0.004ms returns 0x00
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_ExecCommand(“ExcludeFlashCacheRange 0x0-0xFFFFFFFF”, …).
] [JLink ] - 0.005ms returns 0x00
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_SetHookUnsecureDialog
] [JLink ] JLINK_SetHookUnsecureDialog(…)
] [JLink ] - 0.021ms returns 0
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_TIF_Select(JLINKARM_TIF_SWD)
] [JLink ] - 1.020ms returns 0x00
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_SetSpeed(2000)
] [JLink ] - 0.157ms
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_GetSN()
] [JLink ] - 0.013ms returns 801027752
] [JLink ] JLINK_HasError()
- —just_load_core_data
] [JLink ] JLINK_ExecCommand(“CORESIGHT_SetIndexAHBAPToUse = 0”, …).
] [JLink ] - 0.004ms returns 0x00
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_ExecCommand(“device = nRF52”, …).
] [JLink ] XML file found at: /opt/SEGGER/JLink/JLinkDevices.xml
] [JLink ] /opt/SEGGER/JLink/JLinkDevices.xml evaluated successfully.
] [JLink ] Device “NRF52” selected.
] [JLink ] Device “NRF52” selected.
] [JLink ] - 7.951ms returns 0x00
] [JLink ] JLINK_HasError()
- read_debug_port_idr
- read_debug_port_register
- —just_read_debug_port_register
- coresight_configure
] [JLink ] JLINK_CORESIGHT_Configure()
] [JLink ] - 101.416ms returns 0
] [JLink ] JLINK_HasError()
- —just_select_debug_port_register
- Select AP 255, DP Bank 0, AP Bank 255
] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
] [JLink ] - 1.968ms returns -1
] [JLink ] JLINK_HasError()
- JLinkARM.dll reported “-1”, an unknown error.
- —just_abort_debug_action
- Attempting to clear any configuration errors in debug port before closing connection.
] [JLink ] JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x00, 0x0000001F)
] [JLink ] - 1.967ms returns -1
] [JLink ] JLINK_HasError()
- JLinkARM.dll reported “-1”, an unknown error.
] [JLink ] - 0.252ms
- close_dll
- close
- is_connected_to_emu
] [JLink ] JLINK_IsOpen()
] [JLink ] - 0.087ms returns 0x01
] [JLink ] JLINK_HasError()
] [JLink ] JLINK_Lock()
- close
- disconnect_from_emu
- —just_disconnect_from_emu

J-Link>st
VTref=3.299V
TCK=0 TDI=0 TDO=0 TMS=0 TRES=1 TRST=?
Supported target interface speeds:

96 MHz/n, (n>=24). => 4000kHz, 3840kHz, 3692kHz, …
J-Link>

J-Link>selemu
J-Link[0]: Connection: USB, Serial number: 801027752, ProductName: J-Link EDU Mini
Select emulator index: 0
Disconnecting from J-Link…O.K.
Connecting to J-Link via USB…O.K.
Firmware: J-Link EDU Mini V1 compiled Nov 12 2020 13:31:42
Hardware version: V1.00
S/N: 801027752
License(s): FlashBP, GDB
VTref=3.299V
J-Link>

J-Link>connect
Device “NRF52832_XXAA” selected.

Connecting to target via SWD
InitTarget() start
InitTarget() end
InitTarget() start
InitTarget() end
InitTarget() start
InitTarget() end
InitTarget() start
InitTarget() end
Cannot connect to target.

Nikola · December 21, 2020, 2:13pm

Hi @LucRoadrunner,
Have you powered RAK815 from the USB while connecting with the JLink?

LucRoadrunner · December 21, 2020, 3:04pm

Yes, I did. The VCRef and Gnd pins show 3.299 V.
And the RAK815 as the Jlink Edu Mini is powered via a USB Hub self powered.

LucRoadrunner · December 21, 2020, 3:09pm

Nikola · December 21, 2020, 3:49pm

Based on the images that you uploaded I think that the wiring may be wrong, but I can’t see clearly on these images, so please check this again. Also, can you check the JLink on another device, to see if it works fine?

LucRoadrunner · December 21, 2020, 4:18pm

Thank You Nikola,
You gave me a good idea by checking JLink connectivity => the small flat cable was not plugged properly in the Jlink. Wrong direction…
Just missing a guide as on the SWD adapter on the JLink to avoid this kind of silly issue.
Things are much better now. simply great.
Kind regards,
Luc

system · December 23, 2020, 4:18pm

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