void LCD(){
LCD_Clear(Black); //最底层的颜色
LCD_SetTextColor(White); //字体颜色(上层)
LCD_SetBackColor(Red); //中层颜色
LCD_ClearLine(Line0); //LCD_SetBackColor()允许在这五行涂色
LCD_ClearLine(Line1);
LCD_ClearLine(Line2);
LCD_ClearLine(Line3);
LCD_ClearLine(Line4);
LCD_DisplayStringLine(Line1," KEY EXTI DEMO "); ////LCD_SetBackColor()允许在这两行涂色
LCD_DisplayStringLine(Line3," Press the button...");
LCD_SetTextColor(Blue); //换色
LCD_SetBackColor(White); //中层换色
}