LED 1 on nRF5340 is not lighting.

[Dave Preves]

I have plugged in the NF5340 development board into a USB port on my laptop with a USB 2 cable, but LED 1 does not light.  Only the LED next to the light PCA i.c. lights - it is on solid. I have pushed the reset button and all 4 of the other buttons. Please advise. David Preves

[Marjeris Romero]

Hi,

Perhaps your kit came with another preloaded firmware that the one where LED1 pulses from the start. I recommend you follow the instructions for buidling and programming a sample application and test using an application you know how it will behave, for example you can program the blinky example under ncs\zephyr\samples\basic\blinky

https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/basic/blinky

Use the following commands to build the example:

>west build -b nrf5340dk_nrf5340_cpuapp
>west flash

After flashing, one of the LEDs in your kit should start to blink.

Best regards,

Marjeris

[Dave Preves]

Thanks for the suggestion, but it looks like there is something wrong with the nRF 5340 dev board. With the nRF5340 board attached via a USB 2 cable to my pc., only the LED next to the large white PCA i.c. is on solid, and then when I open the Bluetooth Low Energy app in the nRF Connect v1.6.1, it says there are no devices available for connection

[Marjeris Romero]

Hi,

What happens when you run "nrfjprog --com"? Can you see the DK's COM ports listed?

What version of the DK are you using? The version should be listed under "PCA10095"? And from which distributor did you get it?

Since LED5 (the one next to the interface MCU) is ON I think there are good chances that the DK is working as normal, just with no firmware flashed on it, you may have an old PDK instead of the newest release of the DK.

Best regards,

Marjeris