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

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

KapilS 7 months ago

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

0 Håkon Alseth 7 months ago in reply to KapilS

Hi,

Does your custom board have external components for DCDC?

Does it use an external 32 kHz source?

See here on how to configure this in NCS: RE: Enabling LDO or DCDC on nrf connect sdk

Kind regards,

Håkon
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0 KapilS 7 months ago in reply to Håkon Alseth

Hi Hankon,

Thanks again. I successfully program my nRF52840 QFN48 chipset using nRF52840-DK. The problem is related to pinmap. I changed the pin configuration from nRF Device Tree tool and it works! But I have not found the device tree .dts file for nRF52840 QFN48 pin package. Can you suggest me where can I get that? or do I need to create my own as per the datasheet pin layout?

Thanks and Regards,
Kapil
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0 Håkon Alseth 6 months ago in reply to KapilS

Hi Kapil,

Glad to hear that the programming sequence is now working.

KapilS said:
But I have not found the device tree .dts file for nRF52840 QFN48 pin package. Can you suggest me where can I get that? or do I need to create my own as per the datasheet pin layout?

nRF52840 QIAA is the variant you're after. After going through the "create board" in vscode, you can manually add to the custom board that you created (the .dts and also include a pinctrl file).

You can use the nrf52840dk_nrf52840 as a base for your custom board, and change that to match your layout and schematic.

Kind regards,

Håkon
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