https://devzone.nordicsemi.com/f/nordic-q-a/64753/eddystoneHi, I&#39;m trying to implement eddystone in my application, using the example. The problem is the I can&#39;t build my project, as I have an error regarding DRV_RTC_RTC1_INST_IDX undeclared here (not in a function). I guess I need to use the config fileen-USTelligent Community 13Mon, 29 Nov 2021 08:02:45 GMThttps://devzone.nordicsemi.com/thread/340996?ContentTypeID=1Mon, 29 Nov 2021 08:02:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4324e25a-dc54-4388-bbab-0ebcd4dbbc38c.tessierpiart<p>I just recently had this issue.</p> <p>I used the ble_app_uart exemple as a foundation for my project but a coworker decided to used a peripheral ppi exemple instead. When merging the ble into the ppi (not the other way for a particular reason) I had this error concerning <span>DRV_RTC_RTC1_INST_IDX even though&nbsp;NRFX_RTC1_ENABLED was 0 in the ble exemple.</span></p> <p><span>The reason it worked on the ble was because it was enabled in the preprocessor definition via the lines :&nbsp;</span></p> <p><span>APP_TIMER_V2</span></p> <p>APP_TIMER_V2_RTC1_ENABLED</p> <p></p> <p>Hope this helps future users.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/264444?ContentTypeID=1Thu, 13 Aug 2020 11:44:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:631d7432-c420-403c-9cfb-f4da1684637aEinar Thorsrud<p>Hi,</p> <p>This is related to your sdk_config.h file, and that the RTC1 is not properly enabled. If using nrfx directly you need to set NRFX_RTC1_ENABLED to 1 in sdk_config.h. If using the legacy drivers you need to set&nbsp;RTC1_ENABLED to 1 instead. If in doubt, set both to 1 <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p><div style="clear:both;"></div>