Problem in understanding RTC

[adrianwong]

Hi, can anyone explain to me about this example in this link with details : github.com/.../main.c I'm a newbie in nordic and i found it difficult to understand this example. Kindly assist and reply asap. Thanks!

[adrianwong]

Ok. If another library that i using now is already used RTC1 then i cannot used again right? It will show me error like "multiple definition of RTC1_IRQHandler".

[Ole Bauck]

No, I guess you are using some SDK modules that are using app_timer, then you have no RTC left to use (SD uses RTC0 and there are only two RTC on nRF51). You could use app_timer, but the minimum time between two events is 5 ticks (152.59us with prescaler 0) as stated here. Here is a tutorial on using app_timer.

[adrianwong]

what is the different of app_timer and RTC?

[Ole Bauck]

app_timer is a SDK module/library that use RTC to schedule multiple tasks regulary.

[adrianwong]

Okay. I try to find the library that can use together with Arduino IDE but I couldn't find