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适合arduino开发板使用的ps/2库，用于ps/2协议通讯，使用c/c++编写。ps/2协议在主机端和设备端不是完全一样，在通讯时有差别 ...

The popular I 2 C communication standard manages to perform flexible serial I/O with just a super simple two pin bus: SCL and SDA. It accomplishes this trick with bidirectional timing and data flow.