Can I use two RTC in nRF5340?

RE: Can I use two RTC in nRF5340?

AP — Wed, 19 Mar 2025 16:18:37 GMT

I am facing similar issue here, not able to use RTC, i tried all you suggestions and attached same code as well, getting below error-

error: NRFX_RTC (defined at C:/ncs/v2.9.0/zephyr/modules/hal_nordic\nrfx/Kconfig:443,
modules\hal_nordic\nrfx/Kconfig:443) is assigned in a configuration file, but is not directly user-
configurable (has no prompt). It gets its value indirectly from other symbols. See
docs.zephyrproject.org/.../kconfig.html and/or look up NRFX_RTC in the
menuconfig/guiconfig interface. The Application Development Primer, Setting Configuration Values,
and Kconfig - Tips and Best Practices sections of the manual might be helpful too.

Please support!

Thank you!

RE: Can I use two RTC in nRF5340?

Carl Sun — Tue, 29 Jun 2021 06:58:08 GMT

Thanks a lot for your help.

This case can be closed.

Carl

RE: Can I use two RTC in nRF5340?

Sigurd — Mon, 28 Jun 2021 21:15:37 GMT

[quote user="Carl Sun"]

Do you have some code example on how to use one RTC with two or several compare channels?

[/quote]

Here is an simple example:

devzone.nordicsemi.com/.../nrfx_5F00_rtc.zip

RE: Can I use two RTC in nRF5340?

Carl Sun — Fri, 25 Jun 2021 11:39:51 GMT

Does that mean: if the content of the CC Compare register is different, then the duration(period) is different?

Thanks.

RE: Can I use two RTC in nRF5340?

Carl Sun — Fri, 25 Jun 2021 11:29:12 GMT

Thanks,

Do you have some code example on how to use one RTC with two or several compare channels?

enable, disable, start, stop, update, or event handler of the channels.

Thanks.

Carl.

RE: Can I use two RTC in nRF5340?

Sigurd — Fri, 25 Jun 2021 09:41:17 GMT

Hi,

Yes, you have 4 CC Compare register, CC[n] (n=0..3), so you can get 4 different events, EVENTS_COMPARE[n] (n=0..3) , based on what CC register you are using.

RE: Can I use two RTC in nRF5340?

Carl Sun — Fri, 25 Jun 2021 07:31:41 GMT

Hi, understood, Thanks for your help.

In this one RTC, do we have two channels? Can I use two channels?

If yes, can the two channels have two different period( generate two enents)?

Thanks.

RE: Can I use two RTC in nRF5340?

Sigurd — Tue, 22 Jun 2021 08:08:22 GMT

You are getting this error because RTC1 is reserved and used by the Zephyr RTOS kernel timer:

https://github.com/nrfconnect/sdk-zephyr/blob/v2.6.0-ncs1-rc3/drivers/timer/Kconfig#L158

I would recommend looking into using the Zephyr RTOS kernel timer for implementing application timers:

https://docs.zephyrproject.org/latest/reference/kernel/timing/timers.html

RE: Can I use two RTC in nRF5340?

Carl Sun — Tue, 22 Jun 2021 03:13:57 GMT

By the way, I already used 3 timers and 1 GPIO as below:

IRQ_CONNECT(DT_IRQN(DT_NODELABEL(timer0)),
DT_IRQ(DT_NODELABEL(timer0), priority),
nrfx_isr, nrfx_timer_0_irq_handler, 0);

IRQ_CONNECT(DT_IRQN(DT_NODELABEL(timer1)),
DT_IRQ(DT_NODELABEL(timer1), priority),
nrfx_isr, nrfx_timer_1_irq_handler, 0);

IRQ_CONNECT(DT_IRQN(DT_NODELABEL(timer2)),
DT_IRQ(DT_NODELABEL(timer2), priority),
nrfx_isr, nrfx_timer_2_irq_handler, 0);

IRQ_CONNECT(DT_IRQN(DT_NODELABEL(gpiote)),
DT_IRQ(DT_NODELABEL(gpiote), priority),
nrfx_isr, nrfx_gpiote_irq_handler, 0);

Is this the reason why I got those errors when I tried to register the second RTC?

Thanks.

Carl..

RE: Can I use two RTC in nRF5340?

Carl Sun — Tue, 22 Jun 2021 02:56:53 GMT

Hi, I tried your code and got the same error as before.

RE: Can I use two RTC in nRF5340?

Sigurd — Mon, 21 Jun 2021 11:35:29 GMT

Hi,

Maybe you can try this instead, snippet:

	
	IRQ_CONNECT(RTC0_IRQn, NRFX_RTC_DEFAULT_CONFIG_IRQ_PRIORITY,
		nrfx_rtc_0_irq_handler, NULL, 0);

			IRQ_CONNECT(RTC1_IRQn, NRFX_RTC_DEFAULT_CONFIG_IRQ_PRIORITY,
		nrfx_rtc_1_irq_handler, NULL, 0);

(If this does not work either, then please upload your project.)

RE: Can I use two RTC in nRF5340?

Carl Sun — Mon, 21 Jun 2021 10:58:41 GMT

Modified:

I run Project->run CMake in SEGGER EMbedded studio
and rebuild the solution, then I got this error: