本程序实现的功能主要以块方式对文件进行复制拷贝，然后读取文件中数据把块作为 缓冲通过串口发送数据。具体程序见界面上三个按纽的响应函数-the program's main function right way to block copying of documents. Then read data include documents as a block buffer data sent through the serial port. See specific proced