https://devzone.nordicsemi.com/f/nordic-q-a/74603/how-to-use-pins-occupied-by-zephyrHi, I am using NRF5340DK, and I want to define P0.20 as my SPI MOSI pin. However, this pin is pre-defined by Zephyr as uart0 tx pin, in zephyr.dts: Everytime I reset the cpu, P0.20 pin will be low-level, after entered the main function, P0.20en-USTelligent Community 13Fri, 30 Apr 2021 06:35:53 GMThttps://devzone.nordicsemi.com/thread/307597?ContentTypeID=1Fri, 30 Apr 2021 06:35:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:54894435-d410-4f81-9674-3cb90ff4d4faH&#229;kon Alseth<p>disable the serial component:</p> <p>CONFIG_SERIAL=n</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/307590?ContentTypeID=1Fri, 30 Apr 2021 06:16:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab5882cc-1144-442e-bb42-350f40f9a0d0squwal<p>Thank you for reply!</p> <p>Could you please tell me how to disable uart0 claimed by Zephyr RTOS?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/307588?ContentTypeID=1Fri, 30 Apr 2021 06:11:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec786244-9b53-4f07-9687-b12dc97c7f38H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>You cannot reuse a pin that is already claimed by a peripheral, in this case the UART.</p> <p>To use this GPIO as a normal output, you have to stop the TXD.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>