Simulink Coder - Customizing stateflow generated code

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Joseph Stalin on 27 Feb 2013

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Dear Techies, I am intended to generate code from my Stateflow models. I am using Unit delay blocks to represent variables of static type outside the stateflow chart.Because of this generated code is not optimized.

So Is there any way I can represent static type variables within the stateflow? That is implementing the unit delay functionlity inside the stateflow chart. (Using DSM blocks is not allowed as per our guidelines.)

regards, Joseph

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Answer 1

TAB on 27 Feb 2013

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Edited: TAB on 27 Feb 2013

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Unit delay block just have a state variables which stores the previous value of input.

Similarly in Stateflow, you can use a local variable to store the previous value of data. You can use one parallel state with priority-1 which handles all your normal operation and another parallel state with priority-2 which saves the data to previous local variable.

See the Pseudocode below (unfortunately I don't have access to any image hosting website. Thats why I am unable to post any image to explain implementation in stateflow)

/* Parallel state-1 for Operation using previous value */
Out = data + data_prev;
/* Parallel state-2 for saving previous value */
data_prev = data;

But, I can not understand how a unit delay block is affecting your code optimization.

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Joseph Stalin on 27 Feb 2013

I couldn't understand the parallel state concept. or what is the scope (local or In or out) of data_prev? How it is able to store the previous cyle data? Is it possible to send a example model to my gmail ID? (<mailto:jspjose.tl@gmail.com jspjose.tl@gmail.com>)

I am using flow graph in my stateflow as lot of IF/ELSE is used in my algorithm.

How it is affecting code optimization? Actually I am using delay blocks outside the stateflow chart substystem. so structure is updated both in subsystem.c ,model.c file. The dependancy of model.c is created because of using unit delay blocks outside the chart subsystem.

regards, joseph

TAB on 27 Feb 2013