Programming and debugging NRF52840 dongle using external programmer(J-link)

[Saagar]

Hello 

I want to program and debug NRF52840 dongle using jlink But the jlink is not able to find the target . i am using SEGGER J-Link Commander V6.60d application for flashing 

logs in the application::

SEGGER J-Link Commander V6.60d (Compiled Jan 9 2020 17:43:55)
DLL version V6.60d, compiled Jan 9 2020 17:43:01

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: -1
License(s): RDI,FlashDL,FlashBP,JFlash,GDB
VTref=3.287V

Type "connect" to establish a target connection, '?' for help
J-Link>connect
Please specify device / core. <Default>: NRF52840_XXAA
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>4000
Device "NRF52840_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.

----------------------------------------------------------------------------------

Hardware connections:

J-LINK                                                NRF52840 dongle

SWDIO            -----------------------------      SWDIO

SWDCLK        -----------------------------     SWDCLK

5V  SUPPLY   -----------------------------     VBUS

VT REF          -----------------------------     VDD

GND               ---------------------------     GND

------------------------------------------------------------------------------------

User manual of Jlink

UM08001_JLink.pdf

Thanks and Regards

[Kenneth]

S/N: -1

 I have seen this issue occur if this is not an authentic SEGGER programmer. Can that be the case?

[Saagar]

I don't think the problem is with segger programmer because i have programmed many board using this segger programmer

[Kenneth]

Do you have an nRF52840-DK that you can use to program your board for comparison? The nRF52840-DK have an debug out that can be used for the purpose (it's fixed ~3V, but 3.3V on your target board should work).

Best regards,
Kenneth

[Saagar]

Ya i have programmed  the dongle using nrf52840 dk and it was sucessfully running and after i have selected recover option in nrfgo studio then after my dongle stopped working ...can you please help me how to bring the doongle to working state and also i have refered nRF Connect for Desktop Programmer and while flashing the bootloader its shows error as --IDcode not found check target interface ..i am using nrf commandline tool for flashing bootloader

Thanks and Regards

[Kenneth]

Check out:
https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial 

[awneil]

Saagar said:

I don't think the problem is with segger programmer because i have programmed many board using this

I wouldn't rely on that!

If it's a fake J-Link, who knows what problems and limitations it might have!

I was unfortunate enough to be sold a fake J-Link - and it did work in some cases, but not others.

I would certainly suggest that you first try with a genuine J-Link - the on-board J-Link on a Nordic DK would do ...