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先看一下ps2的时序及应用原理。
这里有一篇文章应该会对你有所帮助：http://max.book118.com/html/2014/0225/6128014.shtm
搞清楚原理，可以自己去写，否则永远只能看别人的东西，会很辛苦。
希望可以帮到你。
你肯定需要先弄清楚PS2的传输协议 在SPI的基础上是很好理解的啊
