2837xd code generation - stateflow (2)

3 Matlab-Function

  StateFlow Modules can also call Matlab-Function The function of , Click on the Matlab-Function Icon , Build the following functional model ：

  double-click Matlab-Function, You can define related functions directly . Function definition method refers to ,m Function definition of language .

  Then it can be on the top State Call related functions in , It should be noted here that formal parameters and arguments cannot have the same name . That is, it cannot be used when calling x、y Carry out relevant operations , Will report a mistake .x、y Has been used by function . But the two one. Matlab-Function Function modules can use the same parameters .

4 Graphical Function

  stay chart Add Graphical Function modular ：

  Yes Graphical Function Module for editing ：

  Right click on the module , You can add Flow chart：

  Add an implementation of an absolute value function , And then build a State To call . Note here that when calling , Its independent variables and dependent variables cannot be consistent with the parameters in the function . give the result as follows ：

  Build peripheral components ：

  Here is a small phenomenon , Input sine wave （50Hz）：

1） sampling frequency ：100Hz

2） sampling frequency ：200Hz

3） sampling frequency ：1000Hz

4） sampling frequency ：2000Hz

5） sampling frequency ：4000Hz

  But use the system's own abs Module conversion , You can find , stay 1000Hz when , The system waveform is better ：

 

It can be seen that ,chart There are certain differences in execution efficiency .

5 Simulink Function

  stay chart Module page , Join in Simulink Function, The name is the same as the function mentioned above ：

  stay State Function calls can be made in , Input the function structure above ：**y=func(x)** after , The input and output ports will be automatically generated according to the expression （x.y）. stay Simulink Function Build the corresponding model structure ：

  Then build the peripheral system , As shown in the figure below ：

Sampling frequency is 4000Hz when ：

  You can see , introduce Simulink Function after , Because the system enters Simulink Function Is still carried out in steps , So execution efficiency will be affected .

6 Internal transfer （ Historical node ）

  As shown in the figure, the following chart structure , Put in read Event reading history node . So when the system is in State2 when , stay read After triggering ,State The value recorded in the history node in the state ,read This kind of transfer triggered by events is called internal transfer .

7 Box modular

1） stay chart Create a box modular ,box The module is under the parallel module , It can make the content contained have higher priority . perform box Functions inside the module , You need to give the scope ：

2） Another way is to use atoms Box Encapsulate the model ：

  So let's set up a Library, Build the following Chart Model ：

Simulink Function Build a Digtal clock Output real-time simulation time .

  Preservation , Change the name , Then create a new one Model Type of model , take Library Medium Chart Copied to the Model Medium Chart Module ：

You can see that the model presents a Box The shape of the . The call at this time also needs to comply with Box Call rules of functions in ：

And then to Model Join in out Pin ：

Let's create another one Model modular , Find component Model, The above Model Package after import ：

The advantage of this packaging is , It can easily form modules , Quick call .

8 Self circulation

The external self circulation is shown in the figure , stay du Write self adding statements in ：

You can find du The statement is not executed .

stay en Write a self adding statement ：

stay ex Write self adding statements in ：

In this way, we can infer the execution order of the module , When there is an external loop , The module will execute the external loop first . This is an inevitable trigger en And ex sentence . Only when the external circulation conditions are not satisfied , Will execute du sentence .

For internal loops ：

en Statements add results ：

du Statements add results ：

ex Statements add results ：

en When the sentence is , At the beginning of the program , Enter and execute once, so it is 2. Because the model is always in an internal loop, it will not be executed ex sentence . Because it's always inside the function , therefore du The function executes every step .

9 Enumeration type

StateFlow According to the enumeration type , Show deeper content . Be careful ： Generated enumeration type m The files need to be placed in a directory consistent with the model files .

10 matrix

Define the following model . And then in Model Explorer For data size Define it ：

meanwhile State Flow Matrix data can be accessed in , The access syntax is related to the language set , choice c Language can use multidimensional array operation . choice Matlab Language use m Language operation is enough .