说明：  用来对串口误码率进行测试的一款小程序，原理很简单，就是在发送端发送定义好的数据。然后在接收端看收到了多少错误的桢数
(A small program used to test the bit error rate of serial port, the principle is very simple, is to send defined data at the sender. Then at the receiving end, see how many errors have been received.)