RE: RTC to get date and time

MartinBL — Wed, 28 Jan 2015 09:43:24 GMT

Hi,

If you dive into the inner workings of app_timer_cnt_diff_compute() you will eventually find out that the time difference is computed this way:

((ticks_now - ticks_old) & MAX_RTC_COUNTER_VAL); // MAX_RTC_COUNTER_VAL = 0xFFFFFF;

so you will always get a positive integer output, and the function will show the correct value as long as the time difference is no more than MAX_RTC_COUNTER_VAL.

There is an example called rtc_pca10028 in the nRF51 SDK that demonstrates the RTC. It does not use the app_timer_cnt_diff_compute() function, but it should be easy enough to integrate it and test it.

See this thread about RTC and calendar functionality.

Martin