https://devzone.nordicsemi.com/f/nordic-q-a/38099/timer-driver-config-issueHi everyone, quick question. I&#39;m using the nrf_drv_timer library (from SDK 15.0.0_a53641a) to count the RTT between connection events packet Tx/Rx, however, I get this undeclared error: nrfx_timer.h:74:39: error: &#39;NRFX_TIMER1_INST_IDX&#39; undeclareden-USTelligent Community 13Mon, 03 Sep 2018 07:52:54 GMThttps://devzone.nordicsemi.com/thread/146900?ContentTypeID=1Mon, 03 Sep 2018 07:52:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c167f93-db23-45db-ae6d-1792a46eef30haakonsh<p>You also need to enable the legacy definitions:<br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-d14d481fc6334e358538d32edf6b0b1a/Capture.PNG" alt=" " /></p><div style="clear:both;"></div>