New function for update firmware

1. add function close led
2. add function for update firmware

Update uart write binary data

1. Update uart write binary data
2. Add set charset and query feature

Serialport LED Demo

1. add toggle led marquee switch
2. add query led status button

使用串口操作出租车状态显示示例代码

使用串口操作出租车状态显示示例代码