nRF52840 DK . What would happen if

[p143]

What would happen if using the recently released Programmer app from nRF Connect v 2.6.1 for PC, you accidentally erase all de contain inside the Device Memory Layout window? Would this nRF5280 DK board boot as it was doing before, that is, with a shinning LED5 and LED1 ? Could this be the reason why suddenly my board is no longer being recognized by my PC nor leds lit when the board is connected to the USB interface (although LED5 still lits intermittently if I enter the bootloader mode)?. And finally. Should I assume that my board has gone for good, or there is a way to recover its previous functionality? Thanks for your time and comprehension with a newbie fellow.

[AndreasF]

Hi.

Sorry for the late reply, I've been quite busy today.

When you get it in the bootloader mode, a folder named "BOOTLOADER" should pop up under "This PC"

Download this .bin file and drag that file into that folder, and after that just reset the board.

Also, make sure that your USB cable is not broken or something.

This should work.

Best regards.

Andreas

[p143]

Thanks very much, Andreas. My board is at life again. The only thing I've noticed is that now, after booting, LED1 does not lit. Is that important?

[AndreasF]

Hi.

I'm a bit unsure what you mean, have you programmed an application which toggles LED1 or something like that?

- Andreas

[p143]

Hi Andreas.

No. Is simply what the nRF52840 DK User Guide v1.2 says in paragraph 4 (see here below)  it should happen when you first connect the board to the USB interface if everything is correct:

--------------------------------------------------------------

4 Getting started
Before you start developing, complete a few steps to set up the hardware and download the required
software.
Before you start:
• Unpack the DK.
• Check Minimum requirements on page 6.
Follow the steps below to set up your kit:
1. Connect the NFC antenna to the connector marked NFC.
2. To power up the board:
a) Connect a micro-USB 2.0 cable to the USB connector J2 on the nRF52840 DK and the other end to
one of your PC's USB host port.
In addition to providing power to the board, the USB connection supports target programming.
b) Slide the nRF power source switch SW9 to VDD.
c) Slide the power switch SW8 to the ON position.
A pop-up may appear. You can ignore it.
Check that LED1 has started pulsating. For more information, see Buttons and LEDs on page 29.
Open Windows Explorer to check that the nRF52840 DK has appeared as a removable drive named
"JLINK".
This allows you to program the chip on the board.

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[AndreasF]

Hi.

It is fine if LED1 is not pulsating now, it think that LED1 should pulsate if it is a brand new DK from the factory. What I mean is that all the DK's comes pre flashed with a firmware which makes LED1 pulsate, and since you now have uploaded the J-Link firmware, LED1 does not pulsate.

Best regards.

Andreas