Using RTC to get real time for nRF9160DK

Question

Hi Dev team, 
 I had an issue regarding getting the real time using RTC. I tried to follow the below dev zone blog but the CAL_RTC does not work in my code. 
 As such, I am unable to use this to build my application. Does nR9160DK not support "CAL_RTC" like "NRF_CLOCK" . 
 Can you let me know how I could use the below code to build my app for nRF9160DK. 
 https://devzone.nordicsemi.com/f/nordic-q-a/51781/rtc-31st-date-problem-in-nrf52840 
 
 Also, a question regarding RTC and L F CLK. How can I view the real time value using RTC and L F CLK. 
 I can see in the debugger that they are running but I need to know the real time through it. Some help in explaining this would be appreciated :). 
 
 Regards, 
 Adeel.

ovrebekk · Accepted Answer

Hi Adeel 
 It is not supported in Zephyr, no. 
 I am guessing all the examples you found using NVIC are based on the nRF5 SDK, not on Zephyr. 
 For nRF52 development the nRF5 SDK is a good option, and you can use that if you want, but for the nRF53 series, nRF91 series and future chip series we will not support the nRF5 SDK. 
 Best regards Torbjørn

ovrebekk · Answer

Hi Adeel 
 I updated the Rallare RTC example to update the CC register as you describe, and it seems to work fine for me. 
 The only change I did was to update the rtc_handler function like this: 
 static void rtc_handler(nrfx_rtc_int_type_t int_type)
{
	int rtc_value;
	if (int_type == NRFX_RTC_INT_COMPARE0) {
 nrf_gpio_pin_toggle(LED_0);

 // Get the current counter value, add COMPARE_COUNTERTIME * 8, and update the CC 0 register
 rtc_value = nrfx_rtc_counter_get(&rtc);
 rtc_value += COMPARE_COUNTERTIME * 8;
 nrfx_rtc_cc_set(&rtc, 0, rtc_value, true);

	} else if (int_type == NRFX_RTC_INT_TICK) {
 nrf_gpio_pin_toggle(LED_1);
	}
} 
 Flashing the code I can see LED1 on the DK (referred to as LED_0 in the code) blink every few seconds. 
 Best regards Torbjørn

Using RTC to get real time for nRF9160DK

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