Serial Communication - Trying to make Matlab Wait in a Loop

Question

Kishan 2011-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/2858-serial-communication-trying-to-make-matlab-wait-in-a-loop

Hello,

Basically i'm trying to make Matlab wait untill it receives a byte of data as a Trigger to run the other set of codes.

Now I'm able to receive data in Matlab from Micro-Controller but I wanted to form a loop as in if there is no data received I want matlab to continue waiting for data.

Present code:-

clear all; obj = serial('COM1','baudrate',600); set(obj,'Parity','none'); obj.StopBits=1; obj.DataBits=8; obj.ByteOrder=['bigEndian']; obj.ReadAsyncMode = 'continuous';

fopen(obj)

datain = fread(obj,1,'uchar');

 fclose(obj);
 delete(obj);
 clear obj;

With the above code I'm able to receive but the DATA i receive in Matlab will not be the same if i 'RUN' the this code several times. But it identifies if there is transmission from the controller.

Hence since the data keeps changing I cannot include coding which compares 'DATA' received to the one required.

I'll be glad to give any further details if required. Pls help me solve this issue.

Thanks

Kishan

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Answer 1

Walter Roberson 2011-3-9

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Does obj.BytesAvailable apply in continuous mode?

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Answer 2

Kishan 2011-3-9

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Hello sir,

I checked out in the Matlab help. It says we can use BytesAvailable while asynchronously receiving the data, which i'm presently doing in my project. I think it can be used in continuous mode.

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Walter Roberson 2011-3-9

Yes, I just re-checked the meaning of 'continuous' and BytesAvailable should apply. You might also wish to consider establishing a BytesAvailableFcn callback.

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