Decrease the timer resolution of SDK 14

[Atul Bansal]

How can we decrease the resolution of the timer to 500 ms in SDK 14? The minimum resolution I could get to was 1 ms by changing the APP_TIMER_CONFIG_RTC_FREQUENCY macro to 31. 

Thanks

Atul

[Bjørn Kvaale]

Hi Atul,

I believe this link will be helpful for you. Since you want a resolution of 500 ms, this is the same as 1/.5 s = 2 Hz. Therefore f_RTC = 2Hz.

Solving for the equation gives you a prescaler value of:

PRESCALER = round(32768 Hz/ 2 Hz) - 1 = 16383.

[Atul Bansal]

Hi Bjorn

I knew it already that I have to change the PRESCALER to get the resolution I want. But, I am working with SDk 14.2 and I found that they have removed the PRESCALER argument from the APP_TIMER_TICKS function which was threre in SDK 13. The details can be found here. 

Thus, I need to know the code or any command which will change the PRESCALER value. As far as I searched, I can only find that I need to change the APP_TIMER_CONFIG_RTC_FREQUENCY macro present in sdk_config.h file and that too it's maximum value was 31. If I change it to 16383, my device stops advertising. 

Atul

[superpak]

16383 will not work as the prescaler is only 12 bits!