通信：串行， 并行， COM串口， 485总线，can总线， 单总线

1. Open打开设备
2. 配置设备 tcsetatttr， tcgetattr
3. Write， read 写/读数据
4. 关闭close

一.虚拟机串行端口设置:
1.关闭Ubuntu
2.接好6818开发板串口
3.打开:编辑虚拟机设置

4.点击下方:添加

5.点击: 串行端口

6.点击:完成
7.OK

8.开启Ubuntu

二.Linux下minicom配置

1.安装 :sudo apt-get install minicom

2. sudo minicom
3. ctrl+A ----> O ----> Serial port setup

+-----------------------------------------------------------------------+

4. 回车

5. 保存 -----> Save setup as dfl

       +-----[configuration]------+                                     
       | Filenames and paths      |                                     
       | File transfer protocols  |                                     
       | Serial port setup        |                                     
       | Modem and dialing        |                                     
       | Screen and keyboard      |
     ---> >>>> | Save setup as dfl        |
       | Save setup as..          |
       | Exit                     |
       | Exit from Minicom        |
       +--------------------------+

6. 回车 ------------>>>> Exit from Minicom
7. sudo minicom ----->>> 回车 (若光标下移,则成功,否则改Serial Device : /dev/ttyS2,还不行就一直往上加)

Minicom发送文件

进入minicom终端 : sudo minicom
Welcome to minicom 2.5

OPTIONS: I18n
Compiled on May 2 2011, 00:39:27.
Port /dev/ttyS2

Press CTRL-A Z for help on special keys

[root@GEC6818 /]#AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0
-/bin/sh: c1: not found
-/bin/sh: AT: not found[root@GEC6818 /]#

[1]+ Done(127) AT S7=45 S0=0 L1 V1 X4
[root@GEC6818 /]#
[root@GEC6818 /]#
root@GEC6818 /]#rx write_serial 回车

输入完后按ctrl+a +s