说明：  一个简短的串口调试程序，不同于前面的调试程序，它能在你的串口被程序占用之后也能监测到其中的数据，可以选择16进制显示或asc11码显示，达到真正的监测
(a brief serial debugging procedures, unlike previous debugging procedures, it can be your serial procedures can be occupied after the monitoring of the data, we can choose to show or band 16 asc11 yards, with real monitoring.)