How to determine source block of an input port in Simulink?

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Soham Sinha
Soham Sinha on 31 Aug 2021
Commented: Soham Sinha on 2 Sep 2021
I am writing a Matlab Function Simulink block which has an input. I want to determine the source of the Input port in the Matlab Function and code accordingly. Is there any Simulink API available in Matlab to do that?
If there is, can I get the source block's masks in the Matlab Function block?

Answers (1)

stozaki
stozaki on 1 Sep 2021
Hi,
1. Get the port handle of the target block. (in this example, MATLAB Funciton)
2. Get the line handle of the connected signal line from the obtained port handle.
3. Get the source block handle of the connection source from the obtained line handle.
4. Get the block properties from the obtained source block handle.
mlBlockPath = 'sample/MATLAB Function';
% get port Handle of MATLAB Function.
mlfPh = get_param(mlBlockPath,'PortHandles');
% get line handle of input signal.
inLine = get_param(mlfPh.Inport,'Line');
% get source block handle(In this case the inport block).
srcBlkH = get_param(inLine,'SrcBlockHandle');
% get source block name
blockName = get_param(srcBlkH,'Name');
  1 Comment
Soham Sinha
Soham Sinha on 2 Sep 2021
Thank you! I tried it but this just gets me the immediate previous block, not the source. For example, the connection goes inside a Subsystem (A) and connected to a block (Block B) inside Subsystem A. I want to get the Block A. However, the above procedure will only give me the Subsystem A.

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