https://devzone.nordicsemi.com/f/nordic-q-a/78474/using-the-libuarte-library-with-ble-nusHi I&#39;m trying to use the LIBUARTE library together with BLE_NUS example in SDK 17.2. From the libuarte sample I add these lines to NUS example: I also modify sdk_setup.h from NUS example to match LIBURTE example. Note: NRFX_PPI_ENABLED is seten-USTelligent Community 13Thu, 12 Aug 2021 11:28:27 GMThttps://devzone.nordicsemi.com/thread/324649?ContentTypeID=1Thu, 12 Aug 2021 11:28:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:594f2c63-d451-4f85-8e49-8b000297855aBard<p>I did not have PPI_ENABLED set in sdk_config.h. Setting it made the program compile! The libuarte example do not have it set, so I didn&#39;t think it was required.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/324620?ContentTypeID=1Thu, 12 Aug 2021 09:37:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9a60cabf-028b-4dae-99ca-89ce8b51ad4fSusheel Nuguru<p>Check if you have&nbsp;PPI_ENABLED set to 1 in sdk_config.h. This is weird to have to set both but what you are seeing is most likely the side effects of having integration\nrfx\legacy\apply_old_config.h file included into your project from other files. In an attempt to simplify things, sometimes this file causes conflicts with your interested setting in sdk_config.h file.</p><div style="clear:both;"></div>