atmega128的串口通信源程序。编程风格很好，容易读懂。-atmega128 serial communication source. Good programming style, easy to read.

Atmega128的USRT串口设置，计算机通过串口向开发板发送数据，开发板将数据原样送回-Atmega128 s USRT serial port settings, the computer through the serial port to send data to the development board, development board will return the data as it.