Time-sharing multitask that solve slow response reaction of peripheral has powerful utilities to build embedded software system, advance efficiency for program.
运用时分多任务程序结构构建系统控制软件，解决外设响应慢对实时系统地制约，从而提高程序执行效率。
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Through comparing several others, this paper introduces a method to develop controlling program with multitask by using repeating query technology.