nRF52840 Dongle not detected by laptop after Power Profile Programming

[Shoaib Ahmed Siddique]

Hi,

I connected my nRF52840 dongle to the laptop, it was detected with a red LED glowing on and off. Later I installed the nRF Connect software and installed the Power Profile tool. When I located my device in the Power Profiler Window. it asked for me to program, I clicked on YES and after that the red LED is gone. 

Now when I plug in the nRF52840 dongle again, I cannot see the device light Red LED glowing and also it is not detected by the laptop as well in the device manager. I am using Windows 10 - 64 bit operating system. 

I also tried pressing the reset button but still the nRF52840 device is not detected by laptop and LED is also not glowing. Can someone please help me in resolving this issue. 

I have another controller and want to start with a button press LED on and off code. 

Your help will be highly appreciated. 

[Senchoi]

It's hard to believe reset button isn't working. Are you sure the dongle was plugged in USB when pressing? Are you sure you're pressing the right button? it has to be pressed side ways, not from the top.

[Einar Thorsrud]

Hi,

Could it be that you pressed the wrong button? The reset button is the sideways button as allready mentioned, not the push button (which is marked SW1).

[Shoaib Ahmed Siddique]

No while programming option when it came on I did not press any button. Do I need to press any button to program the dongle?

Also the sideways button is a momentary button I believe, when I press it the button is pushed back. I dont think it is a latch action.

[Shoaib Ahmed Siddique]

@Einar do we need to press the button for programming? 

[Einar Thorsrud]

Hi,

Shoaib Ahmed Siddique said:

No while programming option when it came on I did not press any button. Do I need to press any button to program the dongle?

Yes. If you programmed a firmware that does not include the USB DFU Trigger library then the only way to enter SUB DFU mode is to press the reset button.

Shoaib Ahmed Siddique said:

Also the sideways button is a momentary button I believe, when I press it the button is pushed back. I dont think it is a latch action.

The thing is that this button is connected to the reset pin, and upon reset the bootloader runs and checks the RESETREAS register. If a pin reset has occurred, it will enter DFU mode.