How to use async UART on one instance and interrupt-driven on another (NCS 3.1.0)https://devzone.nordicsemi.com/f/nordic-q-a/127184/how-to-use-async-uart-on-one-instance-and-interrupt-driven-on-another-ncs-3-1-0Hi, I&#39;m using the nRF54L15 (custom board, nRF54L15 DK base) with NCS v3.1.0. I have two UARTs: uart30 — Shell/console (needs CONFIG_SHELL_BACKEND_SERIAL=y , which requires interrupt-driven) uart21 — External modem (LARA-R6001) using async/DMAen-USTelligent Community 13Thu, 26 Feb 2026 14:01:05 GMTRE: How to use async UART on one instance and interrupt-driven on another (NCS 3.1.0)https://devzone.nordicsemi.com/thread/562153?ContentTypeID=1Thu, 26 Feb 2026 14:01:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b991a59e-6e52-4179-a6d5-97913388031dVidar Berg<p>Hello,</p> <p>Please check the .config output for your application and if the specific UART instance is configured for the interrupt or asynchronous api.</p> <p>Finding the .config file from the VS code UI:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1772114454689v1.png" alt=" " /></p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>