Serial Communication Code Error

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Tobias Wzl
Tobias Wzl am 24 Okt. 2017
Kommentiert: Walter Roberson am 3 Nov. 2017
h=instrfindall;
for i= 1:length(h)
fopen('COM'+string(i))
end
h=instrfindall;
str=string(h.name(find(cell2mat(h.BytesAvailable))));
fclose('all');
fopen(str);
I developed this code on friday for finding out on which Port my Arduino is plugged in and it actually worked. Today I tried to implement the code into my GUI and an error is appearing.
Error: Struct contents reference from a non-struct array object.
What do I have to do, so that the error won't appear anymore?
Thank you for your help

Antworten (2)

Nate
Nate am 26 Okt. 2017
Hi Tobias,
Could you please provide more information?
1) Does the code still work correctly when it is not in a GUI? 2) Could you please provide the full error? I am interested in knowing which line causes the error.
Thanks, Nate
  1 Kommentar
Tobias Wzl
Tobias Wzl am 27 Okt. 2017
Bearbeitet: Tobias Wzl am 27 Okt. 2017
No unfortunately not, but in first place it worked in both ways I don't know what's wrong now.
If run the code separate outside of a GUI the error appears in line 6:
*Struct contents reference from a non-struct array object.
Error in Untitled (line 6) str=string(h.name(find(cell2mat(h.BytesAvailable))));*

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Walter Roberson
Walter Roberson am 27 Okt. 2017
You would get that error if instrfindall returns empty.
  8 Kommentare
Tobias Wzl
Tobias Wzl am 3 Nov. 2017
if I execute the first command an empty answer appears --> ans=[]
if I execute the second command Matlab tells me that the function is undefined
And sorry for the late answer I was ill for the last whole week
Walter Roberson
Walter Roberson am 3 Nov. 2017
Hmmm, instrreset has been around in Instrument Control Toolbox since before R2006a; https://www.mathworks.com/help/instrument/instrreset.html
Anyhow, I do not know why your devices cannot be seen, unless perhaps the system considers them to already be in use for something else. Perhaps this link will help: http://www.intech.co.nz/downloads/help/mscanv5/faq_84.htm

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