https://devzone.nordicsemi.com/f/nordic-q-a/122074/unable-to-receive-data-over-uartI have an external GPS module connected to an nrf9151dk over UART. The module is correctly powered, and sending messages over its tx pin, which has been confirmed by attaching a logic analyzer in parallel with the dev board and seeing valid NMEA 0183en-USTelligent Community 13Wed, 11 Jun 2025 09:17:09 GMThttps://devzone.nordicsemi.com/thread/538773?ContentTypeID=1Wed, 11 Jun 2025 09:17:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3284867c-4a74-4dd9-af2a-4d8cd8a0348eHakon<p>Can you add&nbsp;<span>UART_RX_DISABLED , UART_RX_STOPPE</span>D to the uart_callback(), and write to the log whenever those events happen? And please post the log here.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/538457?ContentTypeID=1Fri, 06 Jun 2025 14:47:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:345fc881-72b9-4223-9e01-4d97c932d08cRedrield<p>Hi Hakon,</p> <p>Files are attached. I believe uart1 is used for the TF-M USB ACM CDC serial port by default, hence why I have TF-M logging disabled. When it was used for that I was able to receive data over it just fine.</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/2806.zephyr.dts">devzone.nordicsemi.com/.../2806.zephyr.dts</a></p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/7776_2E00_.config.txt">devzone.nordicsemi.com/.../7776_2E00_.config.txt</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/538453?ContentTypeID=1Fri, 06 Jun 2025 14:41:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a234583b-fdad-4e4c-9b8f-b01b32e654ddHakon<p>Hello,</p> <p>can you show the compiled zephyr.dts and .config? Have you tried using uart1 to send and receive from the USB ACM CDC serial port to a computer?</p><div style="clear:both;"></div>