https://devzone.nordicsemi.com/f/nordic-q-a/29680/51822-2-4g-ble-timer2.4g ble work in 2 mode(not same time) when reset. when I init 2.4g clock void esb_clocks_start( void ) { NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED = 0; NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1; while (NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED == 0); } the ble timeren-USTelligent Community 13Thu, 25 Jan 2018 14:51:36 GMThttps://devzone.nordicsemi.com/thread/117807?ContentTypeID=1Thu, 25 Jan 2018 14:51:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75aa18d6-fe89-4ad5-9d9d-bf05b278ebceJoakim Jakobsen<p>Hi xiaoqing.<br /> I&#39;m not sure if I understand what you are trying to acheive or what your problem is.<br /> Could you elaborate a little? And if you could upload your <code>main.c</code> file, that would be very helpful.<br /> Best regards.</p><div style="clear:both;"></div>