how to connect an external led on nrf5340 pdk?

[milor]

Hello,

I want to connect an external led to the nrf5340 pdk to perform the same function as the blinky example.

I connected this led to D0 (PIN P1.00), but I don't know if this is correct.

If this is feasible, I would like to know how to configurer this GPIO as an LEDEXT alias.

Thank you in advance!

[Simon]

First, I would recommend you to use the nRF5340 DK instead of the nRF5340 PDK. Read more about this here: https://devzone.nordicsemi.com/f/nordic-q-a/74463/nrf5340-pdk-to-ncs-1-5-x-compatibility

Do the following to add a new LED to the blinky example:

https://github.com/nrfconnect/sdk-zephyr/compare/v2.6.0-rc1-ncs1...simon-iversen:blinky_external_led

This sample is just a generic sample demonstrating how to add an extra led to a sample, in your case remove led3 and change the gpios line to:

gpios = <&gpio1 0 GPIO_ACTIVE_LOW>; 

If you use the pdk, name the overlay file nrf5340pdk_nrf5340_cpuapp.overlay instead.

On the nrf5340dk, P1.00 is used by uart1. So you should check if this is the case for the pdk as well. If so, you should use another pin for uart1, use another pin for the external led, or disable uart1 in the overlay file.

Best regards,

Simon

[milor]

Hello, I don't have the nRF5340 DK. So I tried to change LED3 to Led external, by the same code with you, but when I compile, there is an error:

 

Do you know how to solve it?

Thank you in advance!

[Simon]

Can you upload the code as a zipped file, so I can see what you've done?

[milor]

Thank you for your help, I solved the problem. I defined a LED4 in the location of PIN0.26 in the file devicetree_unfixed.h, and then the LED externe lights up after the execution.