Programming external target using nRF54L15 DK

[Sai]

I am trying to external target using the nRF54L15DK and I get the following error.

Error: Failed with exit code 1. Failed to device info one or more devices: * 1057767167: [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1), code: Generic. Message: Operation device-info failed, [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1).

My external target is an Ezurio nRF54L15 module. I have connected the following pins using a standard 10 pin SWD connector .

• Reset
• VDD
• GND
• SWDIO
• SWDCLK
• Pin 3 is connected to ground. 

I have programmed VOUT 1 to 3.2V. My target voltage is 3.25 V

[Simonr]

That sounds very strange, can you show me an image of how you connect the board to the nRF54L15 DK on your end so I can double check it's all correctly connected. Based on your description it seems good.

Best regards,

Simon

[Sai]

Attached is my image of my programming setup. As I mentioned before, the same cable works on an nRF52840-DK board. 

[Sai]

Just to be clear:

• I need to use a shorter cable. 
• The VDD for the external target and the DK need to be the same. I am powering the external target using a 3.3V power supply. Is this enough? 
• Which jumper are you referring to? The instructions in the documentation didn't specifically mention any jumper unless I missed it.

[Sai]

Can you recommend a source for shorter cables? The shortest I could find was 150mm.

[Simonr]

Hi

I googled around and found this one really short one at least: https://thepihut.com/products/10-pin-socket-socket-idc-cable-short-1-5 . As Paal suggests, request this from the distributor of your choice. Most distributors should have shorter ones available. Sorry for linking to the wrong format.

A 3.3V power supply should be fine.

Regarding the jumper, you will need the jumper on the VDDM current measurement jumper P6 as it is placed by default.

Best regards,

Simon

[PaKa]

You should look for a 50mil/1.27mm pitch cable shorter than 5-6cm. Digikey at least have some so don' believe they should be too difficult to find. Simon's link is for a 100mil/2.54mm pitch cable so won't work

[Sai]

Yes. The VDDM jumper is always on as the board won't work without it. Let me try to source a shorter cable.

[Sai]

I ordered a 50mm cable from Mouser and tested it. I am now able to program the board.