"Best method" for avoiding overflow of app_timer

[i_am_trying]

I will use the functions in app_timer to set a timer to fire every 3 seconds. I want this to occur "forever" (e.g.until a restart of the nRF51).

To avoid a timer overflow, is it a better practice to set the PRESCALAR to 0 and clear the timer after each interrupt, or set the PRESCALAR to a higher value and check within the interrupt for a near overflow and clear the timer at that point? If one is better than the other - why is that so?

(thank you)

[i_am_trying]

Thank you. This may be repetitive but it will help me in clarifying. It is correct to say the PRESCALER does one thing only: it lumps the ticks into a grouping so that timed events can happen at larger time periods before an overflow occurs. Yes?

[Susheel Nuguru]

Yes , it just controls the period when the overflow happens

[i_am_trying]

ok. Thank you. In case you are interested, here is my blog post on my experience using the application timer...perhaps other newbies will find it useful: bitknitting.wordpress.com/.../