一种硬件交互方法，不断读状态寄存器，直到设备进入等待状态。
A method of interfacing with hardware that involves repeatedly reading a status register until the device has reached the awaited state.
为了得知外设是否就绪，CPU必须不停地轮询接口(读状态寄存器)并最终锁存数据。
In order to know this, the CPU must be continually 'polling' the interface (reading the status register), and finally latched the data.
为了得知外设是否就绪，CPU必须不停地轮询接口(读状态寄存器)并最终锁存数据。
In order to know this, the CPU must be continually 'polling' the interface (reading the status register), and finally latched the data.
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