002——keil-Error: L6915E: Library reports error: __use_no_semihosting was requested解决

…\OBJ\KEY.axf: Error: L6915E: Library reports error: __use_no_semihosting was requested, but _ttywrch was referenced 这个问题很好解决，是说一个库没有引用。 勾选上，再编译就OK了！

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