How to use RTC Clock with Softdeviceshttps://devzone.nordicsemi.com/f/nordic-q-a/13587/how-to-use-rtc-clock-with-softdevicesHi everyone!. I am beginner for Nordic Devices I want to use RTC Clock with softdevices so I loaded the project ble_uart_s130 from examples. and I changed code like below in nrf_drv_config.h in order to use RTC clock /* CLOCK */ #define CLOCK_ENABLEDen-USTelligent Community 13Sat, 30 Apr 2016 10:52:13 GMTRE: How to use RTC Clock with Softdeviceshttps://devzone.nordicsemi.com/thread/51826?ContentTypeID=1Sat, 30 Apr 2016 10:52:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0afab210-0afc-494e-8083-c32c745ea4d4RK<p>You need to add nrf_drv_clock.c to the project so it gets compiled. And you don&#39;t need to copy the headers to the drive folder either, it should find them if you fix the include paths properly.</p> <p>The error message reasonably clearly tells you there&#39;s no definition of those functions, you only have the declaration in the header file. This is just a standard C build issue.</p><div style="clear:both;"></div>