Programming nrf52840 dongle through nrf52840 development kit

[Vipul_Saini]

Dear support team,

I wanted to program and debug nrf52840 dongle through an external debugger. For that, I connected the debug out of nrf52840 development kit to the SWD pins on the dongle. When I power up the dongle through USB these things happen:

1. Development kit detects that an external target has been connected since it is not able to read the onboard nrf52840
2. The external target which is dongle gets into bootloader mode since the red led on the dongle starts blinking
3. The development kit is detected on nrfconnect application but the application is not able to read the memory of dongle.

My question is why isn't the nrfconnect application able to read the memory of nrf52840 on dongle? Given all the connections made are correct. 

Do I need to erase the bootloader (and set REGOUT0 to 3 V) on nrfdongle to make it readable through development kit?

Let me know if my question is unclear. Hoping for a response. 

[Vipul_Saini]

Hello, I was able to program nrf52840 dongle through nrfconnect programmer using development kit's debug out port by following this article: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf52840_dk%2FUG%2Fnrf52840_DK%2Fhw_debug_out.html&cp=3_0_4_7_9

I made these changes:

1. Cut SB40 bridge on the dev kit
2. Shorted SB47 bridge on the dev kit
3. Removed the USB power supply on the dongle
4. Shorted SB1 bridge on the dongle
5. Cut SB2 bridge on the dongle

Thanks

[awneil]

Thanks for feeding back.

If your question is now resolved, please verify the answer