Matlab Coder Target - Example MATLAB function for edge detection.

Hello

I am running a Matlab 2018 a with Linux Os ,

I have a raspberry PI 3 , and I would like to work with Matlab code target , so I tried the

example that is provided with the package it self .

the function is :

function myApplication()
%myApplication Example MATLAB function for edge detection.

%#codegen
% Copyright 2017-2018 The MathWorks, Inc.
w = matlab.raspi.webcam(0,[320,240]);
d = matlab.raspi.SDLVideoDisplay;

% Main loop
kern = [1 2 1; 0 0 0; -1 -2 -1];
for k = 1:1000
    img = snapshot(w);
    h = conv2(img(:,:,2),kern,'same');
    v = conv2(img(:,:,2),kern','same');
    e = sqrt(h.*h + v.*v);
    edgeImg = uint8((e > 100) * 240);
    displayImage(d,edgeImg);
end
release(w);
release(d);
end

after that I intialize the connection with PI and launching the application

r= raspi

r = 

  raspi with properties:

         DeviceAddress: 'XXXXXXXXXX'                 
                  Port:  XXXX                         
             BoardName: 'Raspberry Pi 3 Model B'      
         AvailableLEDs: {'led0'}                      
  AvailableDigitalPins: [4,5,6,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]
  AvailableSPIChannels: {'CE0','CE1'}                 
     AvailableI2CBuses: {'i2c-1'}                     
      AvailableWebcams: {'DEF-299 Camera (usb-3f980000.usb-1.2):','DEF-299 Camera (usb-3f980000.usb-1.3):'}
           I2CBusSpeed: 100000                        

  Supported peripherals

>> runOnHardware(r,'myApplication')
Code generation successful: View report

but I got a black screen with the screen atached to PI , any Help please why I got the black screen and how I can solve this problem ?

Thank You very Much

the following link is for the package it self

https://de.mathworks.com/videos/matlab-coder-target-for-raspberry-pi-1493068888613.html

Answer 1

[Reeno Joseph]

Hello Abdelrahman,

I'm guessing you are using the MathWorks customized Raspbian image.

The video display is not showing up in the HDMI due to a bug in the SDL library. For more details please refer https://github.com/raspberrypi/firmware/issues/913

As a workaround, you can flash the SD card with a full version of Raspbian(with GUI) and customize it to work with MATLAB -- please follow the OS customization steps in the hardware setup screen.

I hope this helps.

Thanks,

Reeno Joseph