How to import data from a microprocessor

Question

Guillermo Cid Espinosa 2017-10-14

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https://ww2.mathworks.cn/matlabcentral/answers/361312-how-to-import-data-from-a-microprocessor

评论： Guillermo Cid Espinosa 2017-10-24

I am making an interface through app designer but I do not know how to receive the data stored in a microprocessor using a tcpip object.

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Guillermo Cid Espinosa 2017-10-16

在 MATLAB Online 中打开

I am not sure how to set up a tcp object in Matlab. I have done the code but when I run the program the vectors do not receive the data so they are empty.

function read(app)

app.DataReceived_ch=fread(app.t_waveforms);

% Two 8-bit values are read for each 16-bit integer

        i=1;
        j=1;
         while i<length(app.DataReceived_ch)
          app.B(j) = 2^8*app.DataReceived_ch(i+1)+app.DataReceived_ch(i);

% The int numbers greater than (2 ^ 16) -1 are converted to negative

        if app.B(j) > 32768
           app.B(j)=app.B(j)-65536;
        end
          i=i+2;
          j=j+1;  
         end

% The data are distributed in 4 vectors

      app.H1=length(app.B)-4;
      app.B=0.1*app.B;
      app.B1(1 : app.H1/4)=app.B(1 : 0.25*app.H1);    
      app.z1=app.B1;
      app.z1
      app.B2(1 : app.H1/4)=app.B(1+(0.25*app.H1) : 0.5*app.H1);   
      app.z2=app.B2;
      app.B3(1 : app.H1/4)=app.B(1+(0.5*app.H1) : 0.75*app.H1);    
      app.z3=app.B3;
      app.B4(1 : app.H1/4)=appp.B(1+(0.75*app.H1) : app.H1);
      app.z4=app.B4;

flushinput(app.t_waveforms);

pause(0.2);

end % function read

function startupFcn(app)

            app.tip=app.IPField.Value;
            app.t_waveforms = tcpip(app.tip, 80);
            app.t_buttons = tcpip(app.tip, 80);
            app.t_waveforms.BytesAvailableFcn = @read;
            app.t_waveforms.BytesAvailableFcnCount = app.buffer+8; 
            app.t_waveforms.BytesAvailableFcnMode = 'byte';
            set(app.t_waveforms, 'InputBufferSize', app.buffer+8);
end

function StartButton (app,event)

                    app.tip=app.IPField.Value;                                               
                    app.t_waveforms= tcpip('192.168.1.100', 80);                   
                    fopen(app.t_waveforms);
                    echotcpip('off');
                    fprintf(app.t_waveforms,'GET /Interface_waveforms');
                    pause(0.01);
end

Guillermo Cid Espinosa 2017-10-17

在 MATLAB Online 中打开

I have read the data directly using fread without using ByteAvailableFcn and the data has been stored correctly but now I have another problem and this is that in the graph only the first data are represented and these are not updated even if new data is received.

function StartButton(app) If app.Start.Value==1

        set(app.t_waveforms, 'InputBufferSize', app.buffer+8);
        app.tip=app.IPField.Value;                                              
        app.t_waveforms= tcpip('192.168.1.100', 80);                   
        fopen(app.t_waveforms);
        echotcpip('off');
        fprintf(app.t_waveforms,'GET /Interface_waveforms');
        pause(0.01);           
        app.DataReceived_ch=fread(app.t_waveforms);

% Two 8-bit values are read for each 16-bit integer

        i=1;
        j=1;
         while i<length(app.DataReceived_ch)
          app.B(j) = 2^8*app.DataReceived_ch(i+1)+app.DataReceived_ch(i);

% The int numbers greater than (2 ^ 16) -1 are converted to negative

        if app.B(j) > 32768
           app.B(j)=app.B(j)-65536;
        end
          i=i+2;
          j=j+1;  
         end

% The data are distributed in 4 vectors

      app.H1=length(app.B)-4;
      app.B=0.1*app.B;
      app.B1(1 : app.H1/4)=app.B(1 : 0.25*app.H1);    
      app.z1=app.B1;
      app.z1
      app.B2(1 : app.H1/4)=app.B(1+(0.25*app.H1) : 0.5*app.H1);   
      app.z2=app.B2;
      app.B3(1 : app.H1/4)=app.B(1+(0.5*app.H1) : 0.75*app.H1);    
      app.z3=app.B3;
      app.B4(1 : app.H1/4)=app.B(1+(0.75*app.H1) : app.H1);
      app.z4=app.B4;

flushinput(app.t_waveforms);

pause(0.2);

if strcmp(app.Switch.Value, 'Stop')

fclose(app.t_waveforms); fopen(app.t_waveforms);

fprintf(app.t_waveforms,'GET /Interface_waveforms');

end end

function GraphButton(app)

if app.Graph.Value==1

xlim(app.Grafica1,[1 app.n*length(app.Q)]); plot(app.Grafica1,app.z2,'b','linewidth',1.25);

end

Thanks for your help

Jonathan Chin 2017-10-22

在 MATLAB Online 中打开

try adding a button that runs calls by itself

fprintf(app.t_waveforms,'GET /Interface_waveforms');

I believe you need to call this every time you want data then put a debug point there to see if you can get some data

Guillermo Cid Espinosa 2017-10-24

Yes, that is the problem. I do not know how to execute that command cyclically.

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How to import data from a microprocessor

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How to import data from a microprocessor

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