Reset RTC time and date showing some strange behaviour

[Alan Ajit]

Dear Nordic

I have facing some issues in RTC side. In my application RTC and BLE works same time . First installation and set time using function nrf_cal_set_time() works fine both(RTC and BLE).

Again i try to reset the time and date  its show strange behavior (changing time and year continuously). I don't know my procedure to reset RTC time is correct or not i am just call the function nrf_cal_set_time() for setting date and time but its not work . can you help me to solve the issue?

[Sigurd]

Hi,

Since you are using this with BLE/SoftDevice, please make sure that the calendar uses RTC2. I.e. you need to change these defines here.(Change to NRF_RTC2,RTC2_IRQn and RTC2_IRQHandler instead ) (SoftDevice uses RTC0, and app_timer uses RTC1).

[Alan Ajit]

Thank you sigurd for your reply RTC in RTC2  its work fine first time but when i reset the time and date its its not working

my cofiguration 

#define CAL_RTC NRF_                   RTC2
#define CAL_RTC_IRQn                   RTC2_IRQn
#define CAL_RTC_IRQHandler        RTC2_IRQHandler

procedure:

RTC Init and set with time

BLe Init

every thing works fine(get time and date properly and BLE works fine)

when i start to reset the time and date using  nrf_cal_set_time() its show strange behavior(time changing continuously) . i don't know what happen to RTC when i try to reset time again.

observation:-

i can set time once if i try to reset the time RTC fails 

can you help me to solve this issue?

[Sigurd]

If you are setting a completely new and different time, e.g. adjust the new time with several days or years, it seems like the calibration will not work as intended.

Try to remove the calibration offset, and see if that solves your issue. The nrf_cal_set_time() function will then look like this:

void nrf_cal_set_time(uint32_t year, uint32_t month, uint32_t day, uint32_t hour, uint32_t minute, uint32_t second)
{
    static time_t uncal_difftime, difftime, newtime;
    time_struct.tm_year = year - 1900;
    time_struct.tm_mon = month;
    time_struct.tm_mday = day;
    time_struct.tm_hour = hour;
    time_struct.tm_min = minute;
    time_struct.tm_sec = second;   
    newtime = mktime(&time_struct);
    CAL_RTC->TASKS_CLEAR = 1;  
    
	/* Commented out
	
    // Calculate the calibration offset 
    if(m_last_calibrate_time != 0)
    {
        difftime = newtime - m_last_calibrate_time;
        uncal_difftime = m_time - m_last_calibrate_time;
        m_calibrate_factor = (float)difftime / (float)uncal_difftime;
    }
	
	*/
    
    // Assign the new time to the local time variables
    m_time = m_last_calibrate_time = newtime;
}

[Alan Ajit]

Thank you sigurd for your support hope its work fine not test fully. I will update status soon

anyway thanks