Flashing nrf54L05 chipset

RE: Flashing nrf54L05 chipset

jaydev_borkar — Fri, 08 Aug 2025 07:27:00 GMT

I have tried blinky example and was successful in blinking LED of P1.04 and P1.07.
The error which I was encountering while compiling this example is ""Overlapping assignment" of pins in the file

So then I clicked on the file which is creating conflicts, it turned out to be the uart20 config in the dts file.
I commented that dts config. Then finally blinky started working

So, In my actual project which involves the usage of UART, similar error error we are getting.

How do we resolve the conflict of overlapping assignment ?

I get the following error when we use P2.02 and P2.00 as tx and rx of UART lines.

RE: Flashing nrf54L05 chipset

Kenneth — Thu, 07 Aug 2025 13:48:11 GMT

Before you try UART, maybe you can try something simple as checking that all the pins works by for instance toggle them or read the pins if they are intended as inputs?

Kenneth

RE: Flashing nrf54L05 chipset

jaydev_borkar — Wed, 06 Aug 2025 15:16:55 GMT

Hi Kenneth ,

I have created the overlay file as well as build target is nrf54l15dk/nrf54l05/cpuapp while generating the hex file.

We have an external 32kHz crystal as well on the custom board. I have used P2.2 and P2.0 as the UART tx and rx lines respectively. I am not getting logs which I am intended to . The same code works in nrf54l15dk by changing the overlay file and build target.

In my custom board's overlay file, I can see overlapping assignment . The screenshot is attached here.

I can share the working overlay file of nrf54L15DK and the non working file of nrf54L05 custom board here as well.devzone.nordicsemi.com/.../nrf54l15dk_5F00_nrf54l05_5F00_cpuapp_5F00_overlay_5F00_customboard.txt devzone.nordicsemi.com/.../nrf54l15dk_5F00_nrf54l15_5F00_cpuapp_5F00_overlay_5F00_WorkingDK.txt

RE: Flashing nrf54L05 chipset

Kenneth — Wed, 06 Aug 2025 14:16:22 GMT

Hi,

I assumed you in addition to making a file called nrf54L15dk_nrf54l05_cpuapp.overlay also have a build target that is nrf54l15dk/nrf54l05/cpuapp.

Do your custom board have an external 32kHz crystal?

Kenneth