problem in creating serialobject with the command serialport

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Caterina 2023-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/2022672-problem-in-creating-serialobject-with-the-command-serialport

评论： dpb 2023-9-19

Hi!!! I'm a PhD student in a PhD programme of Electronics and computer Science with a degree in Chemistry with almost no experience in controlling my Arduino Uno with Matlab, so my question could be quite simple. Now I have to initializate the serial communication with arduino, so that I create the serialObject with the command serialport. Before to create the SerialObject, I check the serial port available with the command

serialportlist("available")

and from the command the serial port COM3 to which is connected my Arduino results available.

successively I create The serial object with the command serialport

S = serialport("COM3", 9600)

but after creating the serial object, if I can check the serial port available with the comamand serialportlist("available") none serial port results available. what could be the problem?

please, if I poorly described something, tell me so I can define better!!

really thanks for all, sincerely

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Caterina 2023-9-19

Hi!! Really thanks for your kind attention!! I need to connect an I2C RGB display to Arduino and I'm having trouble in the serial communication. I've tried again to create the serial port object with the command

s = serialport("COM3", 9600)

and I receive all the data about the object and it is ok.

Then I create the arduino Object and I'm in this situation:

>> a = arduino('COM3', 'Uno')

Unable to create a communication link with the serial port. Please check the input argument PORT and verify

that a device is connected.

If I create before the arduino object with the above command and then the serial port object I have that:

Error using serialport

Unable to connect to the serialport device at port 'COM3'. Verify that a device is connected to the port, the

port is not in use, and all serialport input arguments and parameter values are supported by the device.

See related documentation for troubleshooting steps.

Really really thanks if you coul help me in understnding better and solving that trouble!!

dpb 2023-9-19

在 MATLAB Online 中打开

arduino doc implies you connect to the Arduino directly by specifying the COM port of interest, it doesn't use the serial port object as the connection argument.

As noted, I've never had an Arduino so "know nuthink!" about it, specifically, but the examples and the syntax shown would just use

a = arduino('COM3','Uno')

without having created the serial port object, S, and, since arduino wants access to that particular port, having attached it to the serial port object, its now no longer available for use by Arduino. That makes sense given the way it appears the Arduino interface connection function is designed. I had presumed (and you also, apparently) that one would create a serial port object and then use it to connect to/communicate with the Arduino, but it creates its own specific object instead.

Alternatively, it appears you can leave the Arduino connected and simply call

a=arduino();

and it should auto-discover/connect to the Arduino board automagically.

Anyway, it now looks to me from this doc that you don't use the serialport() stuff at all here...

Caterina 2023-9-19

yes, controlling the pin with configurePin works!!!

really really thanks for yoiur great help, sincerely!!

dpb 2023-9-19

Glad to hear, good luck!

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