Conversion Limitations

General Limitations

There are some C language features that cannot be represented in a Simulink model or that it is unclear how to support them. Some of these include:

• I/O functions: this code can be extracted out or function can be converted to S-Function.
• Handling of Strings: Simulink and Stateflow did not have support for Strings data types for signals until R2018a release. Modelify added preliminary support to treat Strings as uint8 vectors.
• Multi-threading
• Event processing or Function interrupts
• Pointers to functions
• Memory-mapped I/O
• Scheduling or timing
• Inline Assembly Code

Specific Known Limitations

The list of specific known limitations are included in the sections below.

Conversion Type Limitations

• Code 501: Simulink Loops
• Code 502: Simulink Goto
• Code 503: Stateflow Bus Vector
• Code 541: Simulink Switch with Declaration

MATLAB/Simulink Limitations

• Code 517: Recursive Data Type
• Code 518: Recursive Function
• Code 532: Unsupported Cast Type
• Code 537: Initialize Non Constant Global
• Code 542: Switch With Multiple Enums
• Code 544: Name Conflicts with MATLAB Function or Keyword
• Code 548: Unsupported MATLAB Built-in Type
• Code 557: S-Function type definition in header file required
• Code 561: S-Function for a static function
• Code 564: S-Function direct access to memory
• Code 566: Unsupported int64 and uint64 Data Type

Modelify Limitations

• Code 514: Void Data Type
• Code 515: Function Pointer Type
• Code 516: Unsupported Primitive Type
• Code 520: Changing Global Pointer Address
• Code 521: Changing Static Pointer Address
• Code 522: Graph Too Large
• Code 524: Unsupported Offset Variable
• Code 525: Initialization File Pointer Offset
• Code 526: Unsupported Literal Address
• Code 527: Pointer Ternary Condition
• Code 528: Resolving Dereferenced Edges
• Code 529: Unsupported Pointer Expression
• Code 530: Unsupported Pointer Write
• Code 531: Unsupported Switch Format
• Code 533: Unsupported Static Local Pointer Initialization
• Code 534: Union Multiple Fields
• Code 535: S-Function Unsupported 3-or-more Dimensional Array
• Code 536: Unsupported Ternary Operator
• Code 538: Stub Created for large function
• Code 540: Ignored Function Call
• Code 545: Unsupported case of Increment/Decrement operator
• Code 549: Unsupported S-Function Port Matrix Signal
• Code 551: Stub Created for C library function
• Code 552: Call to unsupported C library function
• Code 555: Function Call and Short Circuiting
• Code 556: Void Pointer Data Type
• Code 559: Repeated function name
• Code 560: The Simulink model exceeds the allowed maximum absolute for width/height

Troubleshooting

Addressing general limitations might depend on the underlying unsupported C language feature. In most cases, the solution will be to refactor the code to extract out the part of code with the unsupported constructs. It is also possible to temporarily omit conversion for the enclosing function by setting it's conversion type to "Don't Convert". If the function is called from other places, then Modelify will create a stub model which will allow a successful conversion of caller functions.

For each specific known limitation, there is a corresponding help page that indicates a possible solution or workaround. See Worklist Item Help Pages.