https://devzone.nordicsemi.com/f/nordic-q-a/86898/problem-when-combining-spi-and-uartHi, I tried to combine the spi and ble_app_uart example. But I got this problem, and the program was stuck in this loop. Here is what I did: I am using the 17.1.0 sdk on nRF52832. I copy the code from the spi example and paste them in the ble_app_uarten-USTelligent Community 13Wed, 13 Apr 2022 13:39:08 GMThttps://devzone.nordicsemi.com/thread/363210?ContentTypeID=1Wed, 13 Apr 2022 13:39:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e728003e-1e1b-455b-90f2-0d586125d480&#216;ivind<p>Hi,</p> <p>I see you already have a case open for this issue: <a href="https://devzone.nordicsemi.com/f/nordic-q-a/86766/problem-when-combining-uart-and-spi">https://devzone.nordicsemi.com/f/nordic-q-a/86766/problem-when-combining-uart-and-spi</a></p> <p>Please do not open duplicate cases.</p> <p>We are low on staff this week due to Easter holidays and delays in responses should be expected. Einar will assist you in your other case after Easter.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/363102?ContentTypeID=1Wed, 13 Apr 2022 06:36:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:11cac788-5663-4c86-8636-23784c5140a1dfbdfb<p>I found the source of this issue. In the SPI example, there is NRF_LOG_DEFAULT_BACKENDS_INIT();. <img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1649831692068v1.png" alt=" " /></p> <p>If I add this line to ble_app_uart example, it will cause the issue. What is the function of this sentence? Should I remove it or change something in the sdk_config?&nbsp;</p> <p></p> <p></p><div style="clear:both;"></div>