1. 程序下载到2个开发板 然后按KEY(左下角第一个按钮)后发送信息，发送完毕后蜂鸣器响一下，对方受到信息后同样 响一下。而且两个开发板都可以做为发送和接收，一个做为发送，对应另一即为接收,实现及时双向通信。-1 The program is downloaded to the development board and press 2 KEY (lower left corner of the first button) after sending the message, sent a