操作串口时,出现Input/output error

本文详细解释了在使用setserial、stty或pppd等工具时遇到的Input/output error错误的原因。包括:1. 指定的I/O地址没有对应的串口设备;2. 中断或I/O地址冲突;3. 串口正在被其他进程占用;4. 输入串口名称时出现拼写错误。

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"Input/output error" from setserial, stty, pppd, etc.

This means that communication with the serial port isn't working right. 

1. It could mean that there isn't any serial port at the IO address that setserial thinks your port is at.

2. It could also be an interrupt conflict (or an IO address conflict). 

3. It also may mean that the serial port is in use (busy or opened) and thus the attempt to get/set parameters by setserial or stty failed.

4. It will also happen if you make a typo in the serial port name such as typing "ttys" instead of "ttyS".

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