https://devzone.nordicsemi.com/f/nordic-q-a/13114/simple-timer-questionhi, i am going to make a simple timer with SDK 6.0.0, nrf51822 and softdevice. first, i use ble_app_uart example as a base code, because i need to BLE communication with high frequency. here is my simple code int main(void) { // Initializeen-USTelligent Community 13Mon, 11 Apr 2016 16:46:49 GMThttps://devzone.nordicsemi.com/thread/50004?ContentTypeID=1Mon, 11 Apr 2016 16:46:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f8739a4-7c79-47fa-b74b-a407b66a845bwooyongKim<p>it works!thanks!!!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/50003?ContentTypeID=1Mon, 11 Apr 2016 15:48:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:642ce1b8-fd4e-4048-a3c6-c42b8ce1e15aRK<pre><code>NRF_TIMER2-&gt;TASKS_START; </code></pre> <p>That doesn&#39;t do anything. You have several places you just reference the task like that eg</p> <pre><code>NRF_CLOCK-&gt;TASKS_HFCLKSTART; </code></pre> <p>and</p> <pre><code>NRF_POWER-&gt;TASKS_CONSTLAT; </code></pre> <p>If you want to trigger the task you need to write a &#39;1&#39; to it</p> <pre><code>NRF_TIMER2-&gt;TASKS_START = 1; </code></pre><div style="clear:both;"></div>