|   开启串口,原来自带的例子是这样的
 
 Start to test Tiny Board.
[ LXT  test ]    LXT  test.....  pass
A
[ HXT  test ]    HXT  test.....  pass
[ GPIO  test ]   GPIO test.....  pass
[ UART test ]
    Press input any data from terminal tool.
    Your input data is : 21ic.com
[ UART test ]    UART test.....  pass
[ USB  test ]    USB  test.....
TinyBoard Test Finished.
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