Matlab blocks arduino comport

Hi all,

I am using matlab (Matlab App Designer to be precise) to communicate with my arduino via serial communication. My code works fine the first time I start the app. If I restart the app, Matlab gives me the following error code:

if true
Error using serial/fopen (line 72)
Open failed: Port: COM4 is not available. No ports are available.
Use INSTRFIND to determine if other instrument objects are connected to the requested
device.
end

If have already tried 'clear all' afterwards, but my COMPORT still seems to be busy. I have to restart matlab to get the app running again.

Do you have any idea how this can be solved?

Answer 1

[Madhu Govindarajan]

I would recommend something along the lines of cleanup that happens when someone closes the App where you can use this - https://www.mathworks.com/help/matlab/ref/serial.delete.html

The other thing I think might help is this function here - https://www.mathworks.com/help/instrument/instrreset.html

which should delete all open instrument objects as per the doc.

HTH

[Dennis Weber]

Thanks, the first part worked!