SWO is Serial Wire output, it is a debug interface of Cortec-M3 and M4 core. The SWO Trace provide access to the memory of a running target without needing to interrupt target. It just requires one extra pin from MCU in addition to the standard SWD connection. It is easy to send debug information. If want to know more detail about SWO Trace, you can have a look at <MCUXpresso_IDE_SWO_Trace> .
The document of <MCUXpresso_IDE_SWO_Trace> has describe SWO Trace function in detail, so in my article , I just demonstrate the steps using SWO Trace on MCUXpresso IDE, based on LPCXpresso54114 board.