Running RTC0 on nrf9151-DK using nrf (Nordic) libraries

[Jaroslav Havel]

Hello everybody,

                        I am trying to get the RTC0 peripheral working on Nordic nrf9151-DK using libraries from Nordic (nrfx_rtc.h, nrfx_clock.h and hal/nrf_rtc.h). I am not able to run rtc_handler using IRQ. Could you please help me with getting RTC0 up and running?

Main.c looks like this:

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/rtc.h>

#include <nrfx_rtc.h>
#include <nrfx_clock.h>
#include <hal/nrf_rtc.h>

bool pripravenost=false;
int navratova=0;

int pocitadlo=0;


struct rtc_time time;
static const nrfx_rtc_t rtc0=NRFX_RTC_INSTANCE(0);

void rtc_handler(nrfx_rtc_int_type_t int_type)
{
    if (int_type == NRFX_RTC_INT_TICK) 
    {
        printk("RTC tick\n");
    }
    pocitadlo=pocitadlo+1;
    if(pocitadlo==10000)
    {
        pocitadlo=0;
        printk("Hoja hoj\n");
    }
    
}
 
int main(void)
{
       
       
        if (!nrfx_clock_lfclk_is_running()) 
        {
        nrfx_clock_enable();
        nrfx_clock_lfclk_start();
        printk("Povoleno + start\n");
         while (!nrfx_clock_lfclk_is_running()) 
          {
            /* čekej na start */
          }
        }
        printk("Hodiny jedou\n");
        nrfx_rtc_config_t config = NRFX_RTC_DEFAULT_CONFIG;
        config.prescaler = NRF_RTC_FREQ_TO_PRESCALER(10);
        config.tick_latency = NRFX_RTC_US_TO_TICKS(1000, 32768),
        config.reliable=true;
        nrfx_err_t err = nrfx_rtc_init(&rtc0, &config, rtc_handler);
        if (err != NRFX_SUCCESS) 
        {
           printk("RTC init error: %d\n", err);
       
        }
        else
        {
             printk("RTC slape\n");   
        }

        // Povol tick interrupt
        nrfx_rtc_tick_enable(&rtc0, true);

        // Start RTC
        nrfx_rtc_enable(&rtc0);
        //IRQ_CONNECT(RTC0_IRQn, 1, rtc_handler, NULL, 0);
        //irq_enable(RTC0_IRQn);
        while(1)
        {
                uint32_t ticks;
                ticks=nrfx_rtc_counter_get(&rtc0);
                k_msleep(1000); // zpomal pro debug
                printk("RTC hodnota: %d\n",ticks); 
               
        }
        return 0;
}

prj.conf looks like this:

# Povolení konzole
CONFIG_CONSOLE=y

# Povolení standardního výstupu (např. printf)
CONFIG_PRINTK=y

CONFIG_RTC=y
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF=y
CONFIG_NRFX_CLOCK=y
#CONFIG_NRFX_RTC=y
CONFIG_NRFX_RTC0=y
#CONFIG_NRFX_RTC1=y

CONFIG_MAIN_STACK_SIZE=2048
CONFIG_RTC_ALARM=y
CONFIG_RTC_UPDATE=y

nrf9151dk_nrf9151_defconfig looks like this:

# SPDX-License-Identifier: Apache-2.0

# Enable MPU
CONFIG_ARM_MPU=y

# Enable hardware stack protection
CONFIG_HW_STACK_PROTECTION=y

# Enable TrustZone-M
CONFIG_ARM_TRUSTZONE_M=y

# Enable GPIO
CONFIG_GPIO=y

# Enable UART driver
CONFIG_SERIAL=y

# Enable console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
#CONFIG_RTC=y
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF=y
CONFIG_NRFX_CLOCK=y
#CONFIG_NRFX_RTC=y
CONFIG_NRFX_RTC0=y
#CONFIG_NRFX_RTC1=y

nrf9151dk_nrf9151_ns.overlay looks like this:

/*
 * Copyright (c) 2024 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

&rtc0
{
	status="okay";
};
&clock {
    status = "okay";
};
&systick {
	zephyr,deferred-init;
};

nrf9151dk_nrf9151.dts looks like this:

/*
 * Copyright (c) 2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <nordic/nrf9151_laca.dtsi>
#include "nrf9151dk_nrf9151_common.dtsi"

/ {
	chosen {
		zephyr,sram = &sram0_s;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
		zephyr,sram-secure-partition = &sram0_s;
		zephyr,sram-non-secure-partition = &sram0_ns;
	};
};
&rtc0
{
	status="okay";
};
&clock {
    status = "okay";
};
&systick {
	zephyr,deferred-init;
};

My build configuration:

Could I use IRQ_CONNECT and irg_enable?

Kind regards

Jaroslav Havel

[Hieu]

Hello Jaroslav,

I haven't gone over your entire code yet, but you need to use IRQ_CONNECT. Please refer to this documentation for more information: Interrupts.

Hieu

[Jaroslav Havel]

Hello,

           thank you for reply. But i think, I don't have to use IRQ_CONNECT, because I am using nrfx_rtc_tick_enable() funkction. Compilator said, that I am doing the same thing if I am using IRQ_CONNECT and nrfx_rtc_tick_enable().

If I run code, I am not able to see anything inside while(1) loop. Could be some problem with internal fault that blocked all code?

Kind regards

Jaroslav Havel