Title: LED Blinking on Custom nRF52840 Board but Not at Given Intervals

RE: Title: LED Blinking on Custom nRF52840 Board but Not at Given Intervals

Priyanka — Tue, 11 Feb 2025 09:06:00 GMT

[quote user="PriyankaKesav"]

Usha said:
we can connect external crystal to custom board ?

Yes of course. You can use an external crystal as the clock source.

As Jakob mentioned in the previous comment, please go through the Clock control documentation. Also, please make sure you schematic is following the Nordic reference designs.

Moreover, as mentioned in the previous comment, please try to run your firmware on a nRF52840DK and see if the issue persists. If so, then it should be a firmware issue, else it's a problem with the clock configuration.

[/quote]

RE: Title: LED Blinking on Custom nRF52840 Board but Not at Given Intervals

Usha — Tue, 11 Feb 2025 08:51:28 GMT

SDK version:2.5.1

RE: Title: LED Blinking on Custom nRF52840 Board but Not at Given Intervals

Priyanka — Tue, 11 Feb 2025 07:23:40 GMT

Hi Usha,

[quote user=""]SDK Version: [Specify your SDK version][/quote]

Please specify the SDK version that you are using.

[quote user="Usha"]we can connect external crystal to custom board ?[/quote]

Yes of course. You can use an external crystal as the clock source.

As Jakob mentioned in the previous comment, please go through the Clock control documentation. Also, please make sure you schematic is following the Nordic reference designs.

-Priyanka

RE: Title: LED Blinking on Custom nRF52840 Board but Not at Given Intervals

Usha — Mon, 10 Feb 2025 04:41:24 GMT

we can connect external crystal to custom board ?

RE: Title: LED Blinking on Custom nRF52840 Board but Not at Given Intervals

Jakob Ruhe — Sun, 09 Feb 2025 08:59:27 GMT

[quote userid="138113" url="~/f/nordic-q-a/118759/title-led-blinking-on-custom-nrf52840-board-but-not-at-given-intervals"]The LED does blink, but not according to the specified time intervals in the code. Instead, it blinks at an unexpected rate.[/quote]

It indeed sounds like the code assumes that the MCU has another clock configuration as input than what it actually has on your custom board. It is hard to guess without seeing the code or the schematic. You can read about clocks here: CLOCK - Clock control.

Perhaps test your blinking LED application also on a nRF52840-DK or similar to ensure that it works there as intended there.