说明：  在LINUX系统中进行I2C总线的传输，通过本例程了解串口的基本原理及使用 ,理解并掌握对串口进行初始化 * * * * 2.请使用串口调试助手（Baud 4800、数据位8、停止位1、效验位无）做为上位机来做收发试验。在调试助手字符串输入框中输入数字和字符，按发送按钮，然后观察接受窗口的变化。也可以用调试助手自动循环发送。
(I2C bus transfer in LINUX system to understand the the serial basic principles and use through this routine, understand and master the serial port initialization**** 2. Use serial debugging assistant (Baud 4800, data bits 8 stop bit efficacy bit) as the host computer to do the transceiver test. The debugging assistant string input box numbers and characters, press the send button, and then observed to accept the change of the window. Can send debugging assistant automatically cycle.)