Matlab serial command to read binary data

Question

Jason Chen 2014-10-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/159011-matlab-serial-command-to-read-binary-data

评论： Jason Chen 2014-10-17

I want to communicate with an Arduino board using Matlab through a serial port. The Arduino board will transmit 8 bytes of BINARY data every 20 ms once it receives a 1. The transmission will stop if the Arduino receives a 0.

The following commands in an m-file work as expected when I step through them in the debug mode. However, the transmission stopped immediately when I ran the m-file. The s.BytesAvailable is zero. It looks like the pause command has not properly executed. Why was wrong? How can I fix it? Thanks.

s = serial('COM15','BaudRate',115200);
fopen(s);
fwrite(s,1);           %ask Arduino to send data
tic;pause(3);toc       %wait for several data to arrive
fwrite(s,0);           %ask Arduino to stop sending data
fprintf(1,'%i\n\n',s.BytesAvailable)
fclose(s)

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Pritesh Shah 2014-10-17

Check following thing. 1. Did u connect to hardware to com15? (Go to device manager and click on port)

2. set(s, ’BaudRate’, 4800); % Set this Baud Rate

Go through following link may be useful: http://home.iitb.ac.in/~rahul./ITSP/serial_comm_matlab.pdf

Jason Chen 2014-10-17

The code worked when I stepped through them in the debug mode. The com port and baud rate are not the problem. I think it has to do with the execution timing.

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Answer 1

Sean de Wolski 2014-10-17

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/159011-matlab-serial-command-to-read-binary-data#answer_155535

You might be interested in doing this with the support package directly rather than using the serial port yourself

http://www.mathworks.com/matlabcentral/fileexchange/47522-matlab-support-package-for-arduino%C2%AE-hardware

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Jason Chen 2014-10-17

Mathworks states that the Matlab support package is not real time and the loop time can't be less than 40 ms (25 Hz). I'm using an Arduino for a real time application and like to transfer data to the computer to display later. I hope the serial data buffer can catch the data at faster rate.

I tried the Simulink Arduino support package. It doesn't work well in external mode either, especially for Due.

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