Integrate C code in Simulink
Simulink / User-Defined Functions
The C Caller block integrates your external C code into Simulink®. This block imports and lists the functions in your external C code, and allows you to select your resolved C functions to integrate in your Simulink models. The C Caller block standalone supports code generation. For more complex models, code generation depends on the capabilities of your Simulink model.
To use the C Caller block, define your source code and any supporting files using Simulation Target under Configuration Parameters. Then, bring a C Caller block to the Simulink canvas, using Library Browser > Simulink > User Defined Functions. To change the defined source code file and its dependencies, go to Simulation Target tab in Configuration Parameters by clicking the from the block dialog. After changing your source code or any of its dependencies, refresh the list of functions by clicking the on the block dialog. To browse and modify the list of functions in your source code, use the icon to access your header files.
Input argument— Input argument for the corresponding C Caller block
Input argument to the C Caller block.
Number of input arguments and their names are inferred through the selected function in your external C code. To receive data to a C Caller block, connect an input signal to the input ports.
Input label has the same name as your input argument unless changed by editing the Label column under Port Specification from the Block Dialog. If you rename the label to an input port, the C Caller block changes the name of the port.
For input variables, you can change the input scope to parameters or constants using the Scope column.
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Output argument— Output argument for the corresponding C Caller block
Output argument from the C Caller block.
Number of output arguments and their names are inferred through the selected function in your external C code. To send data from your C Caller block, connect a block to the output port of your C Caller block.
Output port label has the same name as your output argument unless you change it by editing the Label column under Port Specification from the Block Dialog. If you rename the label to an input port, the C Caller block changes the name of the port.
Function name— Name of the functions in source code
The C Caller block in your model imports all functions in your
external source code, and shows the names of functions under
name in the block dialog. To select and use a function in your block,
confirm that the function names appear at the
table. In case you are missing one of the functions, reload the source code by clicking on the block dialog. To change the names of your
functions, modify your source code and click the refresh button to reload.
Port specification— Specify port properties
Port specification table indicates the attributes of each
input and output element for the selected block. These properties include Argument name,
scope, input/output label, type and size of the input/output variables. Argument name,
scope, type, and size are inferred from your source code. If the scope is an
input, you can modify this variable to a
parameter or a
Arg name — Demonstrates the variable name inferred from your source code.
Scope — Indicates the role of the variables from your source code. If the variable is an input argument in the C Caller block source code, you can change the scope type to a constant or a parameter. If the variable is an output argument in the source code, you cannot change the scope type.
Label — Labels the input or output variable for the Simulink model. You can change the labels using this table. If the scope is a parameter, enter the parameter name in this field. If the scope is a constant, enter the constant value.
Type — Indicates the data type coming from the ports.
Size — Indicates the size of the input and output data.
Actual data type or capability support depends on block implementation.