https://devzone.nordicsemi.com/f/nordic-q-a/101662/why-can-the-printk-function-print-from-the-serial-port-but-log_info-can-not-print-outWhen I opened the demo project, log_inf could not print in serial port or in RTT, but I changed log_inf to printk and it can print, why, I want to print with log_inf now how to achieveen-USTelligent Community 13Mon, 10 Jul 2023 12:02:44 GMThttps://devzone.nordicsemi.com/thread/435481?ContentTypeID=1Mon, 10 Jul 2023 12:02:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:502be5b7-17ff-4567-b5da-654040ed47e3AHaug<p>Hi,</p> <p>For logging in RTT you need to set the following in prj.conf.</p> <p><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/index.html#CONFIG_LOG">CONFIG_LOG=y<br /></a><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/index.html#CONFIG_USE_SEGGER_RTT">CONFIG_USE_SEGGER_RTT</a>=y<br /><a title="CONFIG_LOG_BACKEND_RTT=y" href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/index.html#CONFIG_LOG_BACKEND_RTT">CONFIG_LOG_BACKEND_RTT=y</a></p> <p>It could also be wise to set the default log level based on what you need.<br /><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/index.html#CONFIG_LOG_DEFAULT_LEVEL">CONFIG_LOG_DEFAULT_LEVEL</a></p> <p>If you&#39;re new to nRF Connect SDK, please go through this course:&nbsp;<a href="https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/">academy.nordicsemi.com/.../</a></p> <p>Kind regards,<br />Andreas</p><div style="clear:both;"></div>