https://devzone.nordicsemi.com/f/nordic-q-a/104741/need-to-run-the-uart-along-with-zephyr-consoleHi all, Currently, I am working on an application that requires a UART interface that can talk with a machine running on the UART. I am able to run a demo code that can transmit and receive over UART1. Next, I added the Zephyr, Console over &amp;cdc_acm_uart0en-USTelligent Community 13Wed, 18 Oct 2023 09:36:15 GMThttps://devzone.nordicsemi.com/thread/451016?ContentTypeID=1Wed, 18 Oct 2023 09:36:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:23dacaa3-7a52-4279-accd-f0a69e2e4c12Ankit_chauhan<p>Hi,&nbsp;<span>Kenneth</span></p> <p></p> <p>Thanks for your reply. I resolved the issue of UART callback init failed.</p> <p>Actually, the issue was related to the pin that I selected for UART RX that pin was already used in one of the peripheral pin maps. I changed the pin and it worked.</p> <p>So now I have USB CDC and UART0 running concurrently for the Zephyr console and custom protocol communication respectively.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/450917?ContentTypeID=1Tue, 17 Oct 2023 19:43:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:501b7922-9d26-4e50-b033-c5e96afb2726Kenneth<p>Hi,</p> <p>Can you provide the project (in zip)? I can for instance see a lot missing from your main to make this build.</p> <p>Kenneth</p><div style="clear:both;"></div>