Generate Code for Fuzzy System Using Simulink Coder
You can generate code for a Fuzzy Logic Controller block using Simulink® Coder™. For more information on generating code, see Generate Code Using Simulink Coder (Simulink Coder).
While this example generates code for a type-1 Sugeno fuzzy inference system, the workflow also applies to Mamdani and type-2 fuzzy systems.
Generate Code for Fuzzy Inference System
By default, the Fuzzy Logic Controller block uses double-precision data for simulation and code generation. The
fuzzyPID model is configured to use double-precision data. For more information on configuring your fuzzy inference system for code generation, see Fuzzy Logic Controller.
mdl = 'fuzzyPID'; open_system(mdl)
It is good practice to validate the performance of the system in Simulink. Run the simulation. The model saves the output response
u to the MATLAB® workspace.
To generate code for the model, use the
slbuild (Simulink) function. For this example, suppress the Command Window output for the build process.
### Starting build procedure for: fuzzyPID ### Successful completion of build procedure for: fuzzyPID Build Summary Top model targets built: Model Action Rebuild Reason ========================================================================================== fuzzyPID Code generated and compiled. Code generation information file does not exist. 1 of 1 models built (0 models already up to date) Build duration: 0h 0m 16.049s
By default, Simulink Coder generates C code for a generic real-time target. To select a different target file and language, in the Configuration Parameters dialog box, modify the System target file and Language parameters, respectively.
The generated code is stored in a new
fuzzyPID_grt_rtw folder in your current working folder. The name of this folder depends on the selected target file.
On a Windows® system, by default, an executable file named
fuzzyPID.exe is also added to the current working folder. To generate code without compilation, in the Configuration parameters dialog box, select the Generate code only parameter before generating code.
Run the executable.
if ispc status = system(mdl); else disp('The example only runs the executable on Windows system.'); end
The example only runs the executable on Windows system.
After the executable completes successfully (
status = 0), the software creates a
fuzzyPID.mat data file that contains the simulation results.
You can compare the output response from the generated code,
rtw_y, with the output from the Simulink simulation,
y, using the following code.
load fuzzyPID.mat plot(tout,y,'b-',rt_tout,rt_y,'ro') legend('Simulink','Executable','Location','Southeast')
The result from the generated code matches the Simulink simulation.
You can also generate code for just the controller subsystem in this model. To do so, specify the subsystem when calling the
slbuild([mdl '/Fuzzy PID'])
### Starting build procedure for: Fuzzy0 ### Successful completion of build procedure for: Fuzzy0 Build Summary Top model targets built: Model Action Rebuild Reason ======================================================================================== Fuzzy0 Code generated and compiled. Code generation information file does not exist. 1 of 1 models built (0 models already up to date) Build duration: 0h 0m 11.065s
You can deploy generated code according to your application needs. For example, you can configure the properties of executable files and create static or dynamic libraries. For more information, see Build Process Workflow for Real-Time Systems (Simulink Coder).
Generate Code for Other Data Types
The Fuzzy Logic Controller block also supports single-precision and fixed-point data for simulation and code generation. In both cases, your resulting fuzzy system has decreased accuracy compared to an equivalent double-precision fuzzy system. Use:
Single-precision data to reduce the memory footprint of your system.
Fixed-point data if your target platform only supports fixed-point arithmetic.
To use one of these data types, set the Data type property of the block, and configure the other components in the model to use the same data type.
fuzzyPID_single model is configured for single-precision data. Open the model.
mdl2 = 'fuzzyPID_single'; open_system(mdl2)
In this model, the Data type parameter of the Fuzzy Logic Controller block is set to
single. The Fuzzy Logic Controller block automatically converts input signals to the specified data type. Also, the Simulate using parameter is set to
Code Generation. The Simulate using option does not affect the code generation process. Instead, setting this option simulates your fuzzy system using the same code path used by the generated code.
Generate code for this model.
### Starting build procedure for: fuzzyPID_single ### Successful completion of build procedure for: fuzzyPID_single Build Summary Top model targets built: Model Action Rebuild Reason ================================================================================================= fuzzyPID_single Code generated and compiled. Code generation information file does not exist. 1 of 1 models built (0 models already up to date) Build duration: 0h 0m 17.392s
Setting the Data type parameter of a Fuzzy Logic Controller block ensures that all the inference steps use the specified data type. However, depending on the configuration of other blocks in the model, some of the generated code can still use double-precision data.