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. 

[Shoaib Ahmed Siddique]

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

[Einar Thorsrud]

If the existing application firmware on the dongle does not include the USB DFU trigger library, then yes. you need to press the button for programming. However, if the firmware currently running do include this library, then it is not required. Pressing the button never hurts though, and it is a universal way to enter DFU mode that always works.

[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!

[Einar Thorsrud]

You need to press the sideways button in that case. There is not really much more to say

[Shoaib Ahmed Siddique]

Do you have any idea of bootloader. I am able to go in the bootloader option for the dead dongle, by pressing the reset button before plugging in. Now what do i need to do next. Because when I unplug and plug it again in the normal way(like not keep presingthe reset button whilke inserting) the RED LED is not glowing.

[Einar Thorsrud]

Shoaib Ahmed Siddique said:

Do you have any idea of bootloader. I am able to go in the bootloader option for the dead dongle, by pressing the reset button before plugging in.

What do you mean? The dongle is not powered when it is not plugged in, so that does not help. You need to push the button while it is plugged in (just press and release it).

Shoaib Ahmed Siddique said:

Now what do i need to do next.

Next you program it. What do you want to do with it? If you for instance want to use it with nRF Connect for Desktop Bluetooth, then simply open it and it will ask if you want to program the dongle, and then select "Yes". If you want to program it with something else, you can use the programmer app. Remember that if the dongle is not detected that indicates you need to push the reset button, as explained earlier in this thread.

Shoaib Ahmed Siddique said:

Because when I unplug and plug it again in the normal way(like not keep presingthe reset button whilke inserting) the RED LED is not glowing.

You only need to push the button when you need to program it and the firmware that currently runs on it does not have the DFU trigger library. This should not be something you need to do very often.