App_timer_start issue

[Mithilesh Yadav]

Hi,

I am migrating my code from sDK15 to SDK17. In SDK15 code  app_timer_start() working fine with any timer value. But in SDK 17, I am getting error code 7.

When I debug and compare the app_timer.c file of SDK17 and SDK15, found that there is an extra condition added in app_timer_start() function.

if ((timeout_ticks < APP_TIMER_MIN_TIMEOUT_TICKS) || (timeout_ticks > MAX_RTC_COUNTER_VAL))
{
      return NRF_ERROR_INVALID_PARAM;
}

when I calculated the ticks value using APP_TIMER_CONFIG_RTC_FREQUENCY  0, found that we can start a timer value of maximum 511 seconds and 16383 seconds with with APP_TIMER_CONFIG_RTC_FREQUENCY 31.

So my questions are:

1: Why with no prescaler set , a timer value greater than 511 seconds is perfectly running with sdk15 or removing above highlighted condition in SDK17?

    Can you please tell me the case where my timer will behave wrong?

2: I have many timers whose value exceeds 16383 seconds(which is max possible timer value). So how can I run those timers.

 

Thanks

 

[Jared]

Hi,

I'm not sure why this was added in later SDK, but there doesn't seem like it the new app_timer2.c has this limitation. You can try using that instead, the API should be somewhat similar. 

regards

Jared 

[Mithilesh Yadav]

As I go through app_timer2.c, the required function name and arguments are same but implementation is totally different. 

So can you tell me please the difference between app_timer.c and app_timer2.c.

Where should i  use app_timer.c and app_timer2.c.

Thanks

[Jared]

App timerv2 is a new and improved version of the app timer library. You should replace the old one with v2. The API should be somewhat similar though.