用途：用于电视场输出，音频放大驱动级及一般放大。
Purpose: TV vertical output, audio output driver and general purpose amplifier applications.
同样的输出语句既可以用在内核代码中也可以用于用户级代码中，因此不管是驱动程序还是测试程序都可以用同样的方式来输出消息。
The same print statement can be used in kernel code and user-level code, so that the driver and test programs can be managed in the same way with regard to extra messages.
在脉冲发生器输出端后加一级驱动电路，再接入计数器的时钟脉冲源输入端，可有效地避免通常发生在实验过程中计数器不规则的跳变。
To use the way of put a driven circuit behind the pulser, lead through the input of count clock pulse, can avoid the irregular date on the counter during experiment effectively.
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