https://devzone.nordicsemi.com/f/nordic-q-a/14858/how-to-reset-the-tick-value-in-application-timerMy code detects an external signal using GPIOTE. Whenever the signal falls, GPIOTE calls a handler, audio_stimulus_handler . The code is shown below. Essentially, after detecting the first fall, it starts the timer and gets the tick value when the subsequenten-USTelligent Community 13Thu, 30 Jun 2016 07:32:20 GMThttps://devzone.nordicsemi.com/thread/56712?ContentTypeID=1Thu, 30 Jun 2016 07:32:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4aa3128b-6d40-4346-9fa8-d41d5b873bd7tesc<p>Hi,</p> <p>You can reinitialise the timer with a new call to <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fgroup__app__timer.html&amp;cp=5_0_0_6_8_22_17&amp;anchor=ga3e3f54705d54d1c7fe0f68facd3ae957">app_timer_create()</a> after it is stopped:</p> <blockquote> <p>Note: (...) The function can be called again on the timer instance and will re-initialize the instance if the timer is not running.</p> </blockquote> <p>Alternatively, you can save the old time value and use <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fgroup__app__timer.html&amp;cp=5_0_0_6_8_22_15&amp;anchor=gaad9b5fc66ed908c54281370f690d0c4e">app_timer_cnt_diff_compute()</a> for finding the elapsed time.</p> <p>Regards, Terje</p><div style="clear:both;"></div>