How to program nRF52840-QFN48 chipset using nRF52840-DK?

[KapilS]

Hi,

I want to program a nRF52840-QFN48 package chipset which does not have USB pins. I gone through several articles on the forum but nothing work for me.
Many of them suggested that you need J-Link programmer or nRF52840-DK can also work. I have nRF52840-DK with me. I made a connections as follows:

nRF52840-DK	nRF52840-QFN48
SWDIO	SWDIO
SWDCLK	SWDCLK
VDD[3.3V]	VDD [3.3V]
GND	GND

I have generated to source code .hex file using arduino IDE and tried both programming mode i.e. 1. command line [using nrfjprog] and 2. nRF Connect for Desktop to flash the nRF52840-QFN48 using nRF52840-DK board.

Please suggest me if my approach is not proper or if I was missing anything.

Thanks and Regards,
Kapil S

[Håkon Alseth]

Hi,

 

Your connections are correct, but please note that the "VTG" pin needs to be connected to the VDD.

This is because that is a sense-pin for the nRF52840-DK to switch to that specific programming port.

 

Could you share any logs from nrfjprog? "nrfjprog --recover -f nrf52 --log" should create a .log file which you can upload here.

 

Kind regards,

Håkon

[KapilS]

Hi Håkon

Thank you for your reply. I made the changes as you suggested above.

Please find attached a .log file for your reference.

Fullscreen 5734.nrf52.log Download

C:\Users\Kapil>nrfjprog --recover -f nrf52 --log
Recovering device. This operation might take 30s.
Erasing user code and UICR flash areas.

[Håkon Alseth]

That shows a successful connection, meaning nrfjprog was able to successfully erase the device. You can try to program a sample now and see if that works?

 

Kind regards,

Håkon

[KapilS]

Thanks for confirming that up to this everything is OK. I will check by program a device  and let you know the status.

Thanks and Regards,
Kapil S

[KapilS]

Hi,

I have uploaded the LED blinking code successfully on my nRF52840-QFN48 chipset. But I didn't observe LED flashing on my board. I checked the memory content using "nRF-Connect-Desktop" tool. I am not sure what are the cause and how to test it further to resolve an issue.

Please guide me if you have any idea or suggestions.

Regards,
Kapil S.