How to store continuous serial data from COM port

Question

Joes Lanters 2020-10-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/627838-how-to-store-continuous-serial-data-from-com-port

评论： Walter Roberson 2020-10-30

I want to be able to store my data from a scale that I have connected to my laptop via a COM port. I have the following code, but it only shows the values in the Command Window:

% Assign port to s
s = serialport("COM3",9600);
configureCallback(s,"terminator",@readSerialData)
function readSerialData(src,~)
    data = readline(src);
    disp(data)
end

What can I do to store it in a variable?

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Answer 1

Amrtanshu Raj 2020-10-30

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Hi,

You can achieve the required function using a global variable. They allow you to share variables across multiple functions and scripts. Here you can use a global array and add a value to it in the callback.

Hope this helps !!

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Walter Roberson 2020-10-30

We recommend against global variables!! They should only be used as a last resort or if for some reason the performance would be significantly improved by using global variables (which would take some doing, as global variables are the slowest kind of variables.)

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

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