Custom Arduino Library won't register.

As the title suggests, I am trying to implement custom libraries with the Arduino support package, but I can't get them to register. I'm using 2017b on Windows 10. Support package is version 17.2.0.

I've tried with the three example tutorials (LCD, Ultrasonic, and HelloWorld), and no luck getting them to register.

I have definitely added my arduino libraries to the path, along with my working directory that has my package directories and .m files. I've un/re-installed the support packages (in admin mode and not) and no luck. I did the thing they suggest for troubleshooting here

Here is my HelloWorld.h file:

#include "LibraryBase.h" 
class HelloWorld : public LibraryBase {
public:
  HelloWorld(MWArduinoClass& a){
    libName = "ExampleAddon/HelloWorld";
    a.registerLibrary(this);
  }
public:  
  void commandHandler(byte cmdID, byte* dataIn, unsigned int payloadSize){
    switch (cmdID){
            case 0x01:{  
        byte val [13] = "Hello World";  
        sendResponseMsg(cmdID, val, 13);
        break;
      }
      default:{
        // Do nothing
      }
    }
  }
}

And here is my HelloWorld.m:

classdef HelloWorld < arduinoio.LibraryBase
    properties(Access = private, Constant = true)
        READ_COMMAND = hex2dec('01')
    end
    properties(Access = protected, Constant = true)
        LibraryName = 'ExampleAddon/HelloWorld'
        DependentLibraries = {}
        ArduinoLibraryHeaderFiles = {}
        CppHeaderFile = fullfile(arduinoio.FilePath(mfilename('fullpath')), 'src', 'HelloWorld.h')
        CppClassName = 'HelloWorld'
    end
    methods
        function obj = HelloWorld(parentObj)
            obj.Parent = parentObj;
            obj.Pins = [];
        end 
        function out = read(obj)
            cmdID = obj.READ_COMMAND;
            inputs = [];
            output = sendCommand(obj, obj.LibraryName, cmdID, inputs);
            out = char(output);
        end
    end
end

No matter what I try, the end result is always the same:

    6×1 cell array

      {'Adafruit/MotorShieldV2'}
      {'I2C'                   }
      {'RotaryEncoder'         }
      {'SPI'                   }
      {'Servo'                 }
      {'ShiftRegister'         }

Any thoughts? Thanks!

[Madhu Govindarajan]

So when you say you tried the example tutorials LCD one - are you referring to this one here - https://www.mathworks.com/help/supportpkg/arduinoio/ug/add-lcd-library.html

If so, have you confirmed that when you are adding the files to the path that the subfolders are being included?

Are you getting any error messages/warning messages that are suppressed while you are following these tutorials?

Answer 1

[Menghan]

Hi Kevin,

I know you have tried with the example add-on, but just to confirm it again, can you run the following code in MATLAB where you have the support package installed?

>>addpath(fullfile(arduinoio.SPPKGRoot,'arduinoioexamples','SDKExampleHelloWorld'))

>>listArduinoLibraries

See if you get the HelloWorld addon registered. If not, please contact our Technical Support to get further help.

On a side note, you are missing a semicolon at the end of your class definition in the HelloWorld.h file. Each C++ class ends with it. It will cause arduino programming to fail, after the library register issue is solved.

Thanks,

Menghan

MATLAB Hardware Team

[Kevin Gilliam]

Hi Menghan,

Thanks for your help with this. After I tried using the above command and discovered that it did work, I went about trying to find out why mine wouldn't (I was working the tutorials in a different directory)...

I feel silly, but it turns out that my problem was that I had named the package directory "+arduinoexamples" instead of "+arduinoioexamples". Fixing that made everything start showing up.

Thanks again!

[Charity Reed]

I'm having the same issue but all my directories are named correctly and I am still not able to get it to work. But when I tried Menghan's addpath line, that works but I still can't add my own libraries. Even my own helloworld

[Nicolas Petit]

same thing. This does not work