linux串口应用程序代码，成功在ARM与PC集中测试通过，并用来开发-RS232与RS488通讯

linux下RS232的串口通讯，在程序中可以自己进行相关设置，如波特率，传送位数等。-linux under RS232 serial communication, the process can be related settings, such as baud rate, number of bits transmitted, such as yourself.