以编程方式发现 Simulink 信号是否为总线

Question

我正在使用 MATLAB 2013b，并且我正在尝试编写一个脚本，该脚本将自动将 ToWorkspace 块连接到一组选定的信号。

我可以处理信号的查找/获取句柄、添加块、设置变量名等等。然而，我想做的是以编程方式发现所选信号是标量、数组还是总线信号。这样，我可以将数组重塑为一维数组（以便它们以我想要的方式连接）并将总线信号分解为它们的单个元素。

我尝试了在See if a signal originates from a bus in Simulink 上发布的修复，但没有成功。我敢打赌，这篇文章已经足够老了，建议的修复在我尝试使用的 MATLAB 版本中不起作用。

我知道答案涉及编译模型或使用特定命令更新模型，但我被卡住了。请帮忙！

根据上面的链接，这是我尝试做的：

function usedNames = addToWorkspaceBlock( signal, usedNames )
   % Recursively add whatever blocks are necessary to break down the signal
   % into raw bus elements or reshaped arrays and output them that way

   switch upper( get(signal,'CompiledBusType') )
      case 'NOT_BUS'
         % Will add the reshape block and ToWorkspace block here, saving
         % the name of the ToWorkspace VariableName to usedNames
         keyboard % for debugging
      case {'VIRTUAL_BUS','NON_VIRTUAL_BUS'}
         % Will add the reshape block and ToWorkspace block here, saving
         % the name of the ToWorkspace VariableName to usedNames
         keyboard % for debugging
      otherwise
         error('Unrecognized CompiledBusType %s', get(signal,'CompiledBusType'));
   end
end

我得到的错误是这样的：（忽略行号；我的 addToWorkspaceBlock() 函数是我的主要函数的子函数，它处理获取信号并循环它们）

Error using createToWorkspaceBlocks>addToWorkspaceBlock (line 48)
    line does not have a parameter named 'CompiledBusType'

Error in createToWorkspaceBlocks (line 36)
    usedNames = addToWorkspaceBlock( signals(i), usedNames );

Answer 1

我想我找到了解决办法。

在使用modelName([],[],[],'compile') 编译模型并使用modelName([],[],[],'sizes') 执行尺寸阶段后，CompiledPortDimensions 现在将成为信号源端口的属性。如果信号是总线，则第一个CompiledPortDimensions 将为负。如果是数字（标量或数组），CompiledPortDimensions 将显示信号的size()。

我在下面更新了我的代码。请注意，我没有展示我对信号的实际发现或我将如何添加块，但这就是我最终这样做的方式：

function createToWorkspaceBlocks(signals)

   % Create a ToWorkspace output for each of the given signals


   % Get the root model containing these signals (assume all given signals
   % are in the same root diagram)
   rootSystem = bdroot( get(signals(1),'Parent') );


   % Update the model to establish the CompiledPortDimensions property and rethrow
   % any errors that occur during (i.e., stop this function)
   try
      cmd = [ rootSystem '([],[],[],''compile'')' ];
      evalin('base',cmd);
      %       set_param( rootSystem, 'SimulationCommand', 'update' );
   catch me
      warndlg('The model could not be compiled!');
      rethrow(me);
   end

   cmd = [ rootSystem '([],[],[],''sizes'')' ];
   evalin('base',cmd);


   % Loop through the signals and determine what signal type it is. Make
   % ToWorkspace blocks based on the signal type:
   %  - scalars: signal --> ToWorkspace block
   %  - arrays:  signal --> Reshape(1D) --> ToWorkspace block
   %  - bus:     signal --> BusSelector --> (Reshape(1D) if needed) --> ToWorkspaceBlock
   % Recursively
   usedNames = cell( numel(signals), 1 );

   for i = 1 : numel(signals)
      usedNames = addToWorkspaceBlock( signals(i), usedNames );
   end

   cmd = [ rootSystem '([],[],[],''term'')' ];
   evalin('base',cmd);

end

function usedNames = addToWorkspaceBlock( signal, usedNames )
   % Recursively add whatever blocks is necessary to break down the signal
   % into raw bus elements or reshaped arrays and output them that way

   srcPort     = get( signal, 'SrcPortHandle' );
   srcPortDims = get( srcPort, 'CompiledPortDimensions' );

   if srcPortDims(1) < 0
      % Signal is a BUS

   elseif all(srcPortDims > 0)
      % Signal is NUMERIC
      % % Add reshape block
      % % Add ToWorkspace block
   end
end