MATLAB serial timeout handling.

A have a "default"-configured serial port. How do I implement timeout error handling?

If I do something like this:

try
     fread(SerialObject, 1, 'uint8');
catch err
     myError(err)
end

it does not read that as an error (never executes catch block).

What is the proper way to handle it in this situation?

Answer 1

[Chirag Gupta]

The Timeout is a warning and hence you are unable to catch it. Searching a little, I found a couple of references that might be helpful:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/158768 http://blogs.mathworks.com/loren/2006/10/18/controlling-warning-messages-and-state/

May be something like this:

lastwarn('');
try
  fread(s)
  if(~isempty(lastwarn))
     error(lastwarn)
  end
catch err
   err
end

Answer 2

[Chirag Gupta]

Use the ErrorFcn callback http://www.mathworks.com/help/releases/R2011a/techdoc/matlab_external/timeout.html

[Adam]

I am reading serial data in "continous" mode, so the timeout won't trigger ErrorFcn.

[Chirag Gupta]

Note this will only work for async operations

[Adam]

Chirag -- exactly! So what is a good way to handle this on synchronous serial connections?