cannot connect nRF52832-MDK with Segger Studio via J_LINK

[jer lon]

I cannot get a connection between Seeger Studio and a dev board from Seed Studio called nRF52832-MDK

I have added a pull-down resistor on TDO as I was getting an error that TDO was always 'up'

This is the error message:

Connecting ‘J-Link’ using ‘USB’
  Connecting to target using JTAG
    Loaded C:/Program Files (x86)/SEGGER/SEGGER Embedded Studio for ARM 4.12/bin/JLinkARM.dll
    Firmware Version: J-Link ARM V8 compiled Nov 28 2014 13:44:46
    DLL Version: 6.40`
    Hardware Version: V8.00
    Target Voltage: 3.267
  Device "NRF52832_XXAA" selected.
  TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
  TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
  TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
  TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
  connect failed
Failed to connect to target.
No idcode detected.
Please check connection and Target Interface Type

my question(s):

- should I be using J-Link v9 (9.4? 9.5?)

- should i be selecting nRF52832-XXAA or nRF52832-XXAB in Segger Studio?

- should I be using different pull-ups or pull-downs?

nRF52832-MDK   references:

www.seeedstudio.com/nRF52832MDK-V2-IoT-Micro-Development-Kit-p-3049.html

[Håkon Alseth]

Your J-Link supports SWD by default. Just select "SWD" under "Target Interface type" in your SES settings.

Kind regards,

Håkon

[jer lon]

Thanks.  What pin should VTref go to? I'm looking but I can't find in my doc. Really sorry for being so lame.

[Håkon Alseth]

Hi,

 

You technically need to connect these four pins:

SWDIO -> SWDIO

SWDCLK->SWDCLK

VDD_NRF->VTref

GND->GND

 

Note that this requires your external board to be powered.

 

Kind regards,

Håkon