Programmatically find COM and LPT address

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Gianluca Finotti 2018-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/424082-programmatically-find-com-and-lpt-address

评论： Ming Yue 2018-10-18

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I am using Matlab to program an experiment.

In particular, I am using these lines of code to read and send triggers to an external device:

ioObj = io64;
    status = io64(ioObj);
    io64(ioObj,portWriteAddress,0);

I have found the value for 'portWriteAddress by navigating to: Device manager -> Ports -> LPT1 -> Resources. Then, in Resources there is an entry called I/O Range/ Settings with a code like 02S7 - 02SS (something like that).

Then I have converted it from Hex to Dec and put it in the line above.

THE PROBLEM IS: I am running this experiment on several different computers. Is there a way to programmatically find this range (or address) information fromMatlab?

Thank you all for your time.

Gluce

P.S. The OS that I am using is Windows 7 (it should be soon updated to windows 10). The computers are running either Matlab 2015b or 2016b.

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Ming Yue 2018-10-18

When I connect a Raspberry pi device to USB, I don't see the Resources tab in the Device manager. However some other ports do have the Resources tab. So I think the I/O Range is not a common property and it likely depends on the driver of the device.

If there is any Windows Command that could show this I/O Range property, then you can make system calls in MATLAB using " system " function and get system outputs.

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