java控制串口发送的RXTX，详细环境搭建见说明文档-java control serial sent RXTX, see the detailed documentation built environment

这是利用arm的RTX实时操作系统-最简单点灯，程序完整可运行，适于初学者-This is the use of real-time operating system RTX- arm the most simple lighting program, complete run, suitable for beginners