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Get data from COM port

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paul kaam
paul kaam 2015-5-18
编辑： Walter Roberson 2015-6-26
Hi everyone,
data is send to my laptop by a device through a usb port. How often the data is send depends on de sample time that i choose, it can vary from very 0.05s to ones very 30s.
i want matlab to get the data every time that the device sends it to my laptop. I am not that familiar with matlab and hope you can help me out a bit.
this is what i have so far...:
board = serial('COM3', 'BaudRate', 38400, 'DataBits',8);
fopen(board);
S = fscanf(board);
with S I get (I think) the oldest value stored in the input buffer every time i run fscanf
Thanks in advance!
Paul

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回答（1 个）

Walter Roberson
Walter Roberson 2015-5-18
Set a BytesAvailableFcn callback on the serial port object.
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Guillaume
Guillaume 2015-6-24
No, that would be a violiation of Mathworks copyright.
You can access the same documentation from within matlab by typing:
web(fullfile(docroot, 'matlab/matlab_external/bytesavailablefcn.html'))
and
web(fullfile(docroot, 'matlab/matlab_external/events-and-callbacks.html'))

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