how to connect an external led on nrf5340 pdk?

RE: how to connect an external led on nrf5340 pdk?

milor — Tue, 20 Jul 2021 14:15:42 GMT

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.

RE: how to connect an external led on nrf5340 pdk?

Simon — Tue, 20 Jul 2021 13:38:10 GMT

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

RE: how to connect an external led on nrf5340 pdk?

milor — Tue, 20 Jul 2021 13:23:57 GMT

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!

RE: how to connect an external led on nrf5340 pdk?

Simon — Mon, 19 Jul 2021 13:03:47 GMT

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