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Stateflow Chart Considerations

hisf_0065: Type cast operations in Stateflow to improve code compliance

ID: Titlehisf_0065: Type cast operations in Stateflow® to improve code compliance
DescriptionIn Stateflow charts that use the C action language, use the := notation to protect against Stateflow implicit data type casting for integer and fixed-point calculations to data types other than input data types.
Note

If you follow this and other modeling guidelines, you increase the likelihood of generating code that complies with the coding standards.

RationaleTo avoid implicit casts in the generated code that might violate coding standards.
Model Advisor ChecksCheck assignment operations in Stateflow Charts (Simulink Check)
References

  • DO-331 Section MB.6.3.2.b 'Low-level requirements are accurate and consistent'

  • IEC 61508–3, Table A.3 (2) Strongly typed programming language

  • IEC 61508–3, Table A.4 (3) Defensive programming

  • IEC 62304, 5.5.3 - Software Unit acceptance criteria

  • ISO 26262-6, Table 1 (1b) Use of language subsets

  • ISO 26262-6, Table 1 (1c) Enforcement of strong typing

  • ISO 26262-6, Table 1 (1d) Use of defensive implementation techniques

  • EN 50128, Table A.4 (8) Strongly Typed Programming Language

  • EN 50128, Table A.3 (1) Defensive Programming

  • EN 50128, Table 6 (1g) - 'No implicit type conversions'

  • MISRA C:2012, Rule 10.1

  • MISRA C:2012, Rule 12.2

Prerequisiteshisl_0060: Configuration parameters that improve MISRA C:2012 compliance
Last ChangedR2024a

hisf_0211: Protect against use of unary operators in Stateflow Charts to improve code compliance

ID: Titlehisf_0211: Protect against use of unary operators in Stateflow Charts to improve code compliance
DescriptionTo improve code compliance of the generated code:
A

Do not use unary minus operators on unsigned data types.

Note

The MATLAB® and C action languages do not restrict the use of unary minus operators on unsigned expressions.

RationaleImprove code compliance of the generated code.
Model Advisor ChecksCheck Stateflow charts for unary operators (Simulink Check)
References

  • DO-331 Section MB.6.3.1.b 'High-level requirements are accurate and consistent'
    DO-331 Section MB.6.3.2.b 'Low-level requirements are accurate and consistent'

  • IEC 61508–3, Table A.3 (2) Strongly typed programming language
    IEC 61508–3, Table A.4 (3) Defensive programming

  • IEC 62304, 5.5.3 - Software Unit acceptance criteria

  • ISO 26262-6, Table 1 (1b) Use of language subsets
    ISO 26262-6, Table 1 (1c) Enforcement of strong typing
    ISO 26262-6, Table 1 (1d) Use of defensive implementation techniques

  • EN 50128, Table A.4 (8) Strongly Typed Programming Language
    EN 50128, Table A.3 (1) Defensive Programming

  • MISRA C:2012, Rule 10.1

Last ChangedR2017b