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RTC calendar

Hi, I need a RTC calendar ble stack on nrf51822 . (turn on the RTC0 on ble stack and get the count, how to setting the rtc wakeup )

which calendar need follow : track of the time (hours, minutes and seconds) and date (day, week,month, year)

i want to do list: 1.setting(every sec) and turn on the RTC0 interrupt 2.when the rtc0 trigger convert the RTC0 count to time. 3.configure the rtc0 wakeup when it is going to system off. 4.write to flash when system goto system off. 5.if wakeup by rtc0 or i/o, read the data from flash . and add rtc0 count ,update the timing and write back to flash. if it wake by rtc0, Then the system go into system off .

Can you give a hint about every steps of RTC calendar?

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