USB serial data receive problem and 'COM' port problem?

Question

Nimisha 2016-4-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280097-usb-serial-data-receive-problem-and-com-port-problem

评论： Walter Roberson 2016-4-21

I have written following code to receive serial data and move cube. But I am not receiving data in MATLAB command window as well cube not rotating. I checked in terminal software about data receive, and hardware worksfine. Please correct my code.

    A1 = 0; B1 = 0; C1 = 0; 
   A = [A1 B1 C1];
   B = [A1+1 B1 C1];
   C = [A1 B1+1 C1];
   D = [A1 B1 C1+1];
   E = [A1 B1+1 C1+1];
   F = [A1+1 B1 C1+1];
   G = [A1+1 B1+1 C1];
   H = [A1+1 B1+1 C1+1];
   P = [A;B;F;H;G;C;A;D;E;H;F;D;E;C;G;B];
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3),'g'), hold on
   roll = 2*pi; pitch = 2*pi; yaw = 2*pi;
   dcm = angle2dcm(yaw, pitch, roll);
   P = P*dcm;
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3)) % rotated cube
   axis([-25 25 -25 25 -25 25])
   plot3(0,0,0,'or')
   xlabel('X')
   ylabel('Y')
   zlabel('Z')
pause
s = serial('COM6');
fopen(s)
for i = 1:1000
   P = fgets(s)
 if P == '5'
       A1 = 0; B1 = 0; C1 = 0; 
   A = [A1 B1 C1];
   B = [A1+1 B1 C1];
   C = [A1 B1+1 C1];
   D = [A1 B1 C1+1];
   E = [A1 B1+1 C1+1];
   F = [A1+1 B1 C1+1];
   G = [A1+1 B1+1 C1];
   H = [A1+1 B1+1 C1+1];
   P = [A;B;F;H;G;C;A;D;E;H;F;D;E;C;G;B];
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3),'g'), hold on
   roll = 2*pi; pitch = 2*pi; yaw = 2*pi;
   dcm = angle2dcm(yaw, pitch, roll);
   P = P*dcm;
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3)) % rotated cube
   axis([-25 25 -25 25 -25 25])
   plot3(0,0,0,'or')
   xlabel('X')
   ylabel('Y')
   zlabel('Z')
   grid on
 elseif P == '1'
   A1 = A1+1; B1 = B1; C1 = C1; 
   A = [A1 B1 C1];
   B = [A1+1 B1 C1];
   C = [A1 B1+1 C1];
   D = [A1 B1 C1+1];
   E = [A1 B1+1 C1+1];
   F = [A1+1 B1 C1+1];
   G = [A1+1 B1+1 C1];
   H = [A1+1 B1+1 C1+1];
   P = [A;B;F;H;G;C;A;D;E;H;F;D;E;C;G;B];
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3),'g'), hold on
   roll = 2*pi; pitch = 2*pi; yaw = 2*pi;
   dcm = angle2dcm(yaw, pitch, roll);
   P = P*dcm;
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3)) % rotated cube
   axis([-25 25 -25 25 -25 25])
   plot3(0,0,0,'or')
   xlabel('X')
   ylabel('Y')
   zlabel('Z')
   grid on
 elseif P == '2'
    A1 = A1-1; B1 = B1; C1 = C1; 
 A = [A1 B1 C1];
   B = [A1+1 B1 C1];
   C = [A1 B1+1 C1];
   D = [A1 B1 C1+1];
   E = [A1 B1+1 C1+1];
   F = [A1+1 B1 C1+1];
   G = [A1+1 B1+1 C1];
   H = [A1+1 B1+1 C1+1];
   P = [A;B;F;H;G;C;A;D;E;H;F;D;E;C;G;B];
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3),'g'), hold on
   roll = 2*pi; pitch = 2*pi; yaw = 2*pi;
   dcm = angle2dcm(yaw, pitch, roll);
   P = P*dcm;
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3)) % rotated cube
   axis([-25 25 -25 25 -25 25])
   plot3(0,0,0,'or')
   xlabel('X')
   ylabel('Y')
   zlabel('Z')
   grid on
 elseif P == '3'
    A1 = A1; B1 = B1; C1 = C1+1; 
 A = [A1 B1 C1];
   B = [A1+1 B1 C1];
   C = [A1 B1+1 C1];
   D = [A1 B1 C1+1];
   E = [A1 B1+1 C1+1];
   F = [A1+1 B1 C1+1];
   G = [A1+1 B1+1 C1];
   H = [A1+1 B1+1 C1+1];
   P = [A;B;F;H;G;C;A;D;E;H;F;D;E;C;G;B];
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3),'g'), hold on
   roll = 2*pi; pitch = 2*pi; yaw = 2*pi;
   dcm = angle2dcm(yaw, pitch, roll);
   P = P*dcm;
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3)) % rotated cube
   axis([-25 25 -25 25 -25 25])
   plot3(0,0,0,'or')
   xlabel('X')
   ylabel('Y')
   zlabel('Z')
   grid on
 elseif P == '4'
    A1 = A1; B1 = B1; C1 = C1-1; 
   A = [A1 B1 C1];
   B = [A1+1 B1 C1];
   C = [A1 B1+1 C1];
   D = [A1 B1 C1+1];
   E = [A1 B1+1 C1+1];
   F = [A1+1 B1 C1+1];
   G = [A1+1 B1+1 C1];
   H = [A1+1 B1+1 C1+1];
   P = [A;B;F;H;G;C;A;D;E;H;F;D;E;C;G;B];
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3),'g'), hold on
   roll = 2*pi; pitch = 2*pi; yaw = 2*pi;
   dcm = angle2dcm(yaw, pitch, roll);
   P = P*dcm;
   axis([-25 25 -25 25 -25 25])
   plot3(P(:,1),P(:,2),P(:,3)) % rotated cube
   axis([-25 25 -25 25 -25 25])
   plot3(0,0,0,'or')
   xlabel('X')
   ylabel('Y')
   zlabel('Z')
   grid on
 else 
 end
 end
 fclose(s)
 delete(instrfindall)

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Answer 1

Walter Roberson 2016-4-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280097-usb-serial-data-receive-problem-and-com-port-problem#answer_218762

fgets() always returns the line with the line terminator included. You then compare the line to a single character. The line terminator is not going to match the character so the comparison will always be false.

I always recommend using fgetl() instead of fgets() except under uncommon circumstances. And if you are reading a single character, use fread() with a count of 1.

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Nimisha 2016-4-21

please help as soon as possible.!

Walter Roberson 2016-4-21

在 MATLAB Online 中打开

For the moment, for testing purposes, switch back to fgets(), but after you read the value, display double(P) and tell us what the values look like.

You should also be switching to use strcmp() instead of using == for strings.

I did not compare line for line, but it looks to me as if your different cases involve one different line such as

A1 = A1; B1 = B1; C1 = C1-1;

and that the rest of the drawing code is the same? If so then it would be more readable to have the if block only set the A1, B1, C1 as appropriate, and then after the end of the if, have the common drawing code.

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USB serial data receive problem and 'COM' port problem?

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USB serial data receive problem and 'COM' port problem?

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