https://devzone.nordicsemi.com/f/nordic-q-a/14118/spi-master-integration-to-ble_app_uart-pca10028-errorHi Guys, I tried to integrate the spi master project to ble_app_uart. For that I added the missing headers from spi project to ble_app_uart. And also I added the .c files. I changed the include path to get the headers of spi project to ble_app_uarten-USTelligent Community 13Sat, 28 May 2016 20:10:56 GMThttps://devzone.nordicsemi.com/thread/53955?ContentTypeID=1Sat, 28 May 2016 20:10:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ea63c87-11c7-43c3-a1d8-c32938ef54daShiju C G<p>Now I did.it was the problem.thanks for the reply</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/53954?ContentTypeID=1Fri, 27 May 2016 14:13:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:449709a2-d325-4d85-b4c9-72155cefe88cPetter Myhre<p>Have you enabled the SPI in nrf_drv_config.h?</p><div style="clear:both;"></div>