LED1 is not blinking while advertising

[Jagruti]

Hello,

I am working on ble_app_uart example on nRF52840DK.

According to the documentation, when the device is advertising, the LED1 should blink. But I am not able to see the LED blinking. The advertising is done properly, just the LED is not blinking. The LED is ON all the time.

When I connect the device, LED1 is ON and when I disconnect the LED1 is OFF, which is correct.

I have not made any changes in the program.

I tried the other programs like ble_app_hts and ble_app_hrs but still the LED never blinked.

Any help is appreciated.

Regards,

Jagruti

[Marte Myrvold]

Hi Jagruti,

You say you haven't made any changes in the project, but have you changed anything any other places in the SDK, like in one of the bsp files? Could you try to download a clean version of the SDK and see if you get the same problem with a project from there? Also, which version of the SDK are you using?

Are you using the correct project for your DK? With a nRF52840 DK you should use pca10056.

Best regards,

Marte

[Jagruti]

Hi,

Thank you for the reply so quickly.

Yes you are right. I downloaded other version of SDK and it's working properly.

[Marte Myrvold]

Hi Jagruti,

Great to hear that it's working now! Good luck with your development!

Best regards,

Marte

[Jagruti]

Hi,

I have seen one more problem. When nRF52840DK is power supplied with USB, the program works. There is advertising and I can connect to the bluetooth.

But when the DK is externally power supplied with VDD, the bluetooth does not work. There is no advertising and blinking of the LED also.

Edit: UART does not work with external supply. There is bluetooth advertising but the error comes while connecting.

[Marte Myrvold]

Hi Jagruti,

What are you using to supply the power to the DK, and what is the voltage you're supplying? The problem might be because of noise in the power supply or incorrect voltage levels.

Since you're using an external power supply, the interface MCU USB cable is not connected. The interface MCU on the DK runs SEGGER J-Link OB interface firmware and is used to program and debug the firmware, which might be why UART isn't working.

Best regards,

Marte