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This is handy if there are multiple pulse blocks and each of them needs to be controlled, may be with different signal. Here, the sample time is set to be inherited. However, before that there could be additional things a user might be interested in doing before computing the outputs.
Things like some initialisation tasks or computations associated with this or other block s. For such things, Simulink provides methods like Start and InitializeConditions.
All these registered methods now need to be defined. If user declares two parameters in the setup method, the dialog box can input two input arguments and the second one can be accessed as block.
Data coming into the input port of the s-function is accessed as block. If there are two input ports declared in setup method, the data into second port can be accessed as block.
Whenever block parameters are being set, they need to be written as strings. Hence, numeric data in the input port of s-function is converted to string using num2str. We will not use terminate method, it may be safely left blank. You are now good to start using the variablePulseWidth s-function.
Variable Pulse Width Pulse Generator with s-function Its possible that you get an error complaining that PulseWidth must be a number between 0 and That happens at the beginning of simulation when the s-function block is executed before the block feeding1 its input, i.
If Simulink executes s-function before its feeding block in, there will be no data present at its input port, i. However, zero is invalid entry for pulse width. This issue can be addressed by changing the block execution order of these two blocks. The initial value chosen for pulse width can be either specified manually in the block parameters window of Pulse Generator block.
Instead of hard coding it inside the function, this can be made a user specifiable parameter in the s-function dialog box. Note that the name of block must be in single quotes as its a string.
The built-in s-function templates make writing s-functions a bit easier. The former lists 7 most used of the 25 available callback methods, while the latter lists almost all. How have your experiences been with s-functions? Do you like to see a specific use of s-functions in a followup blog post here?
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We are an unbiased, independent subscription based stock selection service. 20 thoughts on “ How to write s-functions in Matlab ” Sagar 17 May, at pm. Hi I really liked the way you taught about S function. I am a Master Student and doing my thesis which involves the great use of S function.
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