Error using serial/fopen

5 次查看（过去 30 天）
Gaston Melo
Gaston Melo 2023-4-13
回答： Govind KM 2024-9-27
Hi to all, Im trying to open serial port on matlab (on Linux Tumbleweed 64) and I check first:
1) Im in the dialout group
2)instrfind
3)chmod +777 /root/lock
and matlab keeps giving me "Error using serial/fopen (line 72)
Open failed: Port: /dev/ttyUSB0 is not available. No ports are available."
why?
Im writing code in app designer and don't know how to solve it in code.
Thanks

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回答（1 个）

Govind KM
Govind KM 2024-9-27
Hi Gaston,
A possible reason for the "No ports are available" error is that MATLAB only automatically recognizes serial port names of the form "/dev/ttyS[0-255]". If the serial port has a different name, it can be identified in MATLAB by modifying the "java.opts" file or by creating a symbolic link to a conventionally named port. More details can be found in the following MATLAB Answers post:
https://www.mathworks.com/matlabcentral/answers/95024-why-is-my-serial-port-not-recognized-with-matlab-on-linux-or-solaris
The error could also be caused by permission issues in Linux, in which case please try the workarounds mentioned in this MATLAB Answer:
https://www.mathworks.com/matlabcentral/answers/229181-serial-communication-in-maltab-using-linux-64-bit
Hope this is helpful!

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