创建串口设备文件
[英]Create serial port device file
问题描述
I need to develop a test program, which sends and recieves data from terminal to the serial port. 
我需要开发一个测试程序，该程序可以从终端向串行端口发送和接收数据。
In order to do that I want to create virtual device file and work with it. 为此，我想创建虚拟设备文件并使用它。 I did that by using command: 我通过使用命令来做到这一点：
mknod -m 666 ttyS32 c 4, 500
The device file was successfully created, however I can't write data to it. 设备文件已成功创建，但是我无法向其中写入数据。 Both programmatical and terminal ways give the following error: 编程方式和终端方式均产生以下错误：
No such device or address
In CI used standard file I/O functions, and in terminal I used the 'echo' command. 在CI中，使用标准文件I / O功能，而在终端中，使用'echo'命令。 Do you have any ideas how to write data to serial port device file? 您有任何想法如何将数据写入串行端口设备文件吗？
1 个解决方案
解决方案1
1 已采纳 2012-07-10 09:31:25
That's right. 那就对了。 You can write to the serial device using echo . 您可以使用echo写入串行设备。 Are you sure that the device (not the device file) exists and is properly handled by the driver? 您确定设备（不是设备文件）存在并且已被驱动程序正确处理吗？
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