用两片AVR（ATmega16）单片机 实现双机通信（双向，并带反馈）。开发环境为ICCAVR。文件中不但有完整的源代码，还有用PROTEUS作的仿真图。-With two AVR (ATmega16) single-chip dual machine communications (two-way, and with feedback). Development environment for ICCAVR. Document not only complete source code, bu