Programing custom PCB Board through nRF52-DK

[ENENER]

Hi.

I am going to make my own PCB with nrf52832.

Before making it, I have to check debugging through P20 in nrf52832 DK.

I have two nrf52832 DKs with SDK17.0.0.

I will call first nrf52832 No1, and the other No2 for understanding.

So, I connected No1's GND, SWDCLK, SWDIO and VDD to No2's same part.(I connected No1's P20 to No2's P20)

Also, I connect USB to No1. And, I connected external VDD to No2.

Then, I run nRF Connect's Programmer to download firmware to NO2.

But, there are only No1. I want to check No2.

How to I download firmware to No2 through No1?

I attached picture for your understanding.

I got error message like this "Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4) Lowlevel error: JLINKARM_DLL_ERROR (ffffff9a)" in nRF Connect.

How can I solve this problem?

Thanks.

[Einar Thorsrud]

Hi,

From the photo it looks like you have not connected GND DETECT to ground. Then, the onboard debugger will debug the onboard nRF and not the external one.

[ENENER]

Hi

I connected GND Detect to external DK's ground.

But still onboard debugger is debugged in nRF Connect and Segger Embedded Studio.

Do you know what's problem?

[Einar Thorsrud]

I do not immediately see the issue. Can you compare with the diagram in this post?