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取 想找到ln（）函数
是不是log（）就是ln
看看这个帖子：https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/938409/ccs-tms320f28377s-ccs?tisearch=e2e-sitesearch&keymatch=%252525252522Ln%252525252522#
另外找到中文论坛有用IQmath实现的（因为是定点芯片）：e2echina.ti.com/.../ccs
