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这部分是定时器中断发生之后进去了，在此之前，需要定时器初始化，初始化设置一个时间，调用time_run，设置的时间到了就到了你截图这部分。
运行以上代码后，38ms进一次中断，这是为什么啊？可以指导一下吗？
