https://devzone.nordicsemi.com/f/nordic-q-a/18015/pwm-timerHi ， I use timer to handle pwm signal, 1.when calling button by phone is pressed, Timer starts,(function:on_key_trig_speaker_event()) 2.pwm signal run (speaker_meas_timeout_handler()) 3. when stoping button by phone is pressed, Timer stop,(functionen-USTelligent Community 13Fri, 02 Dec 2016 12:29:06 GMThttps://devzone.nordicsemi.com/thread/69443?ContentTypeID=1Fri, 02 Dec 2016 12:29:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1a2e200c-08fe-4964-b94d-1343b6a7454aSigurd<p>What do you mean by &quot;calling button by phone is pressed&quot; ?</p><div style="clear:both;"></div>