For error "nrf Connect for Desktop v3.9"

Advanced Solutions
1

I’m going to download from nrf52840 using j-link.
However, there is an error that recognizes well in “SEGGER”, but does not recognize in “nrf connect for desktop”.
Error Windows

error
error1369×946 40.7 KB

SEGGER Message

Connecting to J-Link via USB...O.K.
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware version: V8.00
S/N: 1084599810
License(s): RDI,FlashDL,FlashBP,JFlash,GDBFULL
VTref=3.293V


Type "connect" to establish a target connection, '?' for help
J-Link>connet
Unknown command. '?' for help.
J-Link>connect
Please specify device / core. <Default>: CORTEX-M4
Type '?' for selection dialog
Device>?
Please specify target interface:
  J) JTAG (Default)
  S) SWD
  T) cJTAG
TIF>s
Specify target interface speed [kHz]. <Default>: 4000 kHz
Speed>
Device "NRF52840_XXAA" selected.


Connecting to target via SWD
Cannot connect to target.
J-Link>
2

Well the Segger JLink software can’t connect either, so it’s the same with the “nRF Programmer” application.

Double check all connections between the JLink and the target nRF chip – SWDIO, SWCLK, GND, VTARGET → 3.3V, that the target is powered, that it’s not held in RESET, etc.

Otherwise ask at the nRF or segger forums – not sure how this is related to PlatformIO.

3

I succeeded in connecting to the target with jlink.

aaaa
aaaa561×523 8.19 KB

4

The second last line says Cannot connect to target.

5

I made a wrong decision. ^^;