Read serial input from /dev/tty in linux

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Christian Wittpahl
Christian Wittpahl 2016-10-28
评论： Christian Wittpahl 2016-10-28
I'm trying to visualize the input of a serial device. The device lies in "/dev/ttyACM0". I already found out, that MATLAB doesn't read this kind of device, so I made a link to it called "/dev/ttyS101". I can perfectly read the output of the device using "cat" in the console, but if I try using fopen() in MATLAB I always get this response:
Error using serial/fopen (line 72)
Open failed: Port: ttyS101 is not available. No ports are
available.
Use INSTRFIND to determine if other instrument objects are
connected to the requested device.
I don't have the "Instrument Control Toolbox" installed, is that the problem?

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Walter Roberson
Walter Roberson 2016-10-28
instrfind() is part of MATLAB these days.
Check the ownership and permissions on /dev/ttyS101 . It would not be uncommon for it to have been configured without "other" access.
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Christian Wittpahl
Christian Wittpahl 2016-10-28
You were half right! the ownership of /dev/ttyS101 was alright, but the /var/lock folder was owned by root, while matlab was trying to create a file/folder there.

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