这个程序我经过了好长时间的调试，可以在开发板上直接运行。在调试过程中发现串口的波特率设置是很重要的，他直接决定了能否真确的显示-This procedure I passed quite a long period of debugging, you can run directly in the development board. Found during debugging serial port baud rate setting is very important, and he wi