Using fscanf, won't print out second row of data

Question

Brandon 2013-2-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/62775-using-fscanf-won-t-print-out-second-row-of-data

I'm having trouble using the fscanf command to show the two different data points that are being sent over a com port. The data that is coming from the com port looks like this:

X,Y

1,6

2,5

3,4

4,3

5,2

6,1

Where each set of 0,0 is in a single cell.

I would like the data to look like this

X: 1, 2, 3, 4, 5, 6

Y: 6, 5, 4, 3, 2, 1

Please help if you can! I need to get this working soon. Thank you in advance!

%% Clearing COM PORTS

delete(instrfindall)

%% Create the serial object

 serialPort = 'COM4';
 serialObject = serial(serialPort,'BaudRate',38400, 'DataBits',8);
 fopen(serialObject);

%% Set the instrument in remote mode

fprintf(serialObject,'%f,%f');

%% Set the time span and interval for data collection

 stopTime = '14:31';
 timeInterval = 0.0025;

%% Collect data

 count = [1,1];
 while ~isequal(datestr(now,'MM:SS'),stopTime)
   time(count) = datenum(clock); 
   position(count) = fscanf(serialObject,'%f,%f');
   pause(timeInterval);
   count = count +1;
 end
 fclose(serialObject);
 delete(serialObject);
 clear serialObject;

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Answer 1

Walter Roberson 2013-2-9

1
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编辑：Walter Roberson 2013-2-9

在 MATLAB Online 中打开

You have

fprintf(serialObject,'%f,%f');

fprintf() is to send data, but you have not included any data to send. Perhaps the instrument is not in remote mode because of this problem.

Also, I suspect that for that instrument you will need to set the serial port Terminator property; I suspect it sends CR or CR+LF

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Answer 2

Brandon 2013-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/62775-using-fscanf-won-t-print-out-second-row-of-data#answer_74642

Ok, some of that makes sense to me.

I commented out the fprintf( and the code still works the same. Maybe the code I am trying to adapt to my device isn't exactly right.

I am using an arduino that has already been programmed. Basically what the arduino is doing is sending dx and dy position through a usb cable. I need to open the com port to save the data in matlab. The dx and dy originally is received in one cell. Like this dx,dy dx,dy ... Right now only dy is showing up. Let me know if you need anything else and thank you again for your help.