https://devzone.nordicsemi.com/f/nordic-q-a/126512/why-p0-9-p0-10-cannot-as-uartnrf sdk 17.1 example:peripheral/uart/pca10040 I attempted to use P0.9 and P0.10 on the development board to set up a UART serial port for data transmission and reception (as required by our project&#39;s hardware). However, I found that data could not been-USTelligent Community 13Wed, 14 Jan 2026 13:12:01 GMThttps://devzone.nordicsemi.com/thread/558708?ContentTypeID=1Wed, 14 Jan 2026 13:12:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a7c0c0f6-b7aa-449a-b1b7-2c74ec6d5be2Kenneth<p>Hello, Did you do an eraseall of the chip in between the tests? Else it might still be stored in uicr.</p> <p>Also check out :&nbsp;<a href="https://docs.nordicsemi.com/bundle/ug_nrf52832_dk/page/UG/dk/hw_nfc_if.html">https://docs.nordicsemi.com/bundle/ug_nrf52832_dk/page/UG/dk/hw_nfc_if.html</a>&nbsp;</p> <p>Kenneth</p><div style="clear:both;"></div>