RTC usage on Zephyr Issues

[Joao Dullius]

Hello,

I'm trying to run a simple example setting the RTC1 in a nRF52840-DK, but I'm having some issues.

Here is my prj,conf and code:

# nothing here
CONFIG_PM=y
CONFIG_PM_DEVICE=y
CONFIG_NRFX_RTC1=y

#include <zephyr/kernel.h>
#include <nrfx_rtc.h>
#include <nrfx_timer.h>

#define RTC_INSTANCE 1
#define ALARM_PERIOD_SECONDS  2
static nrfx_rtc_t rtc = NRFX_RTC_INSTANCE(RTC_INSTANCE);


void rtc_event_handler(nrfx_rtc_int_type_t int_type)
{
    if (int_type == NRFX_RTC_INT_COMPARE0) {
        // Handle RTC event here
        printk("RTC event occurred\n");
    }
}

void main(void)
{
    printk("Hello World!\n");

    nrfx_rtc_config_t config = NRFX_RTC_DEFAULT_CONFIG;
	config.prescaler = RTC_FREQ_TO_PRESCALER(1);
    nrfx_rtc_init(&rtc, &config, rtc_event_handler);
    nrfx_rtc_tick_enable(&rtc, true);
	
	uint32_t alarm_ticks = ALARM_PERIOD_SECONDS;
	nrfx_rtc_cc_set(&rtc, 0, alarm_ticks, true);
    nrfx_rtc_enable(&rtc);
}

The idea above is set the prescaler to 1 second and fire at every 2 seconds.

The RTC handler is simply not firing, as follows:

Can you help me to figure out what is missing? Code attached.

rtc_sleep.zip

[Jørgen Holmefjord]

Hi,

You need to connect the interrupt from Zephyr's interrupt handling to the nrfx_rtc driver in your application for the interrupts to work correctly. Eg.:

IRQ_CONNECT(DT_IRQN(DT_NODELABEL(rtc1)),
DT_IRQ(DT_NODELABEL(rtc1), priority),
nrfx_isr, nrfx_rtc_1_irq_handler, 0);

Best regards,
Jørgen