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I believe what you would like to do is flush of the buffer, right? If that's the case, then, as you can see in the D2000 documentation (found in C:\IntelSWTools\ISSM_2016.0.027\firmware\bsp\1.0\doc\html) specifically in group__groupUART.html, there's no flush function.
However, you could implement your own routine which changes all of the ports signal (including control signals) to a default value.
thank you for your respone. Now everything is clear.