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.

[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.

[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.

[Shoaib Ahmed Siddique]

I am using the nRF52840 dongle for the first time. Now when I go to the BLuetooth Low Energy Application in the nRF Connect window. It asks me that do you want to program this device (YES or NO)? What do I select here. 

If I select YES do I need to press the RESET button while programming?

[Einar Thorsrud]

No nee to press reset button here, no. You only get this question because the existing firmware supports USB DFU. Simply say yes and you will get the firmware you need.

[Shoaib Ahmed Siddique]

As mentioned earlier in the post. I have 2 nRF52840 dongles. 

One of them got dead this way, like I connected it to the nRF power profile and it asked me to program, now without pressing any button I programmed it. After a while it was not detectable on my laptop and no RED LED glowing on it. Its like completely dead.

Now I have the second controller its glowing the RED LED but I cannot take risk without knowing the actual way to program it. 

Please help!

[Senchoi]

The way to use that dongle is,

First plug it in, and then press the reset button, then the red light will glow.

If you plug this out and back in at this stage, the dongle will return to the previous program. So the red light will not glow.

when you see red light glowing, that's when you have to program. Always.

Also note that there are many programs for dongles that cannot be detected by the OS when plugging in. So just because you cannot detect the dongle, it doesn't mean that you lost the dongle. It just means that the dongle is running a program when plugged in. If you want to reprogram it, just press the reset button and program it again.