说明：  嵌入式系统中串口通信帧的同步方法，介绍多机串口通信的各种同步方法，有效过滤干扰字节确保通信稳定，个人觉得还不错，值得一看
(Embedded System serial communication frame synchronization method to introduce a variety of multi-machine synchronous serial communication methods and an effective filtering interference bytes to ensure the communication stability, and personally feel pretty good, worth a visit)