常用的单片机子程序库： 目前已有若干版本的子程序库公开发表,它们各有特色。本程序库中的开平方算法为快速逼近算法,它能达到牛顿迭代法同样的精度,而速度加快二十倍左右,超过双字节定点除法的速度。-Single-chip common subroutine library: there are a number of versions of the subroutine library published, they have their own characteristics. Library in