GUI problem while doing serial communication

I am doing serial communication between matlab and controller. I have created a GUI. The problem is whenever I am starting serial communication the GUI doesn't appears but when I terminate the program GUI appears. I want GUI to appear in real time.I am not getting the problem.

Answer 1

[Walter Roberson]

Create serial object BytesAvailableFcn callbacks to handle the serial data, instead of looping around checking for data.

There is a sample GUI for serial communications in the File Exchange

[Nachiket Patki]

Sir thanks for your reply. What I did is I created push button for serial communication to set up and then when input comes I put if condition like if S1=='A' change the color. But the problem is color is not changing only serial communication happens. What to do?

[Nachiket Patki]

Its something like this.....

function pushbutton1_Callback(hObject, eventdata, handles)

global S1;global r1;

r1 = serial('COM16','BaudRate',9600);

fopen(r1);

set(r1,'Timeout',10);

S1=fgets(r1)

function varargout = AjayGUI_OutputFcn(hObject, eventdata, handles) 

global S1;

if (S1=='A')

          set(c21,'FaceColor','g')
          set(c22,'FaceColor','w')
          set(r2,'FaceColor','w')
          set(c23,'FaceColor','w')
      elseif (S1=='B')
          set(r2,'FaceColor','w')
          set(c23,'FaceColor','w')
          set(c22,'FaceColor','g')
          set(c21,'FaceColor','w')
      elseif (S1=='C')
          set(r2,'FaceColor','w')
          set(c23,'FaceColor','g')
          set(c22,'FaceColor','w')
          set(c21,'FaceColor','w')
      elseif (S1=='D')
          set(r2,'FaceColor','r') 
          set(c23,'FaceColor','w')
          set(c22,'FaceColor','w')
          set(c21,'FaceColor','w')

      end
  axis off;

[Walter Roberson]

The *OutputFcn is not called until you are exiting the GUI, by which time you are probably destroying the graphics.

[Nachiket Patki]

so how to slove this calling function problem? Where should I call it?

[Walter Roberson]

It would seem to make the most sense to put the display code in pushbutton1_Callback, or at least have pushbutton1_Callback call the display code.

Note: fgets() returns the line terminator as part of the string, but you are using == to do comparisons. You should use fgetl() and you should use strcmp()