Conversión iterativa a punto fijo en Simulink
Fixed-Point Tool es una herramienta que automatiza la tarea de especificar tipos de datos de punto fijo en un modelo de Simulink®. La herramienta recopila datos de rango para objetos de modelo basados en rangos de simulación, derivados o de diseño. En el flujo de trabajo Iterative Fixed-Point Conversion
, la herramienta propone tipos de datos de punto fijo que aumentan la precisión y cubren el rango. Luego podrá revisar las propuestas de tipos de datos y aplicarlas de forma selectiva a los objetos del modelo. Si no se cumplen los requisitos de diseño, puede ajustar la configuración de la propuesta de tipos de datos, visualizar sus efectos e iterar hasta que el sistema cumpla con los requisitos.
Para convertir un modelo a punto fijo, consulte Iterative Fixed-Point Conversion Using the Fixed-Point Tool. Para ver un ejemplo del proceso de conversión completo, consulte Convert Floating-Point Model to Fixed Point.
El objeto DataTypeWorkflow.Converter
y sus funciones de objeto asociadas son una alternativa de línea de comandos a Iterative Fixed-Point Conversion
en Fixed-Point Tool.
Herramientas
Fixed-Point Tool | Convert a floating-point model to a fixed-point model |
Funciones
fxptdlg | Open the Fixed-Point Tool |
Clases
DataTypeWorkflow.Converter | Create fixed-point converter object |
DataTypeWorkflow.findDecoupledSubsystems | Get a list of subsystems to replace with an approximation |
DataTypeWorkflow.ProposalSettings | Proposal settings object for data type proposals |
DataTypeWorkflow.Result | Object containing run result information |
DataTypeWorkflow.VerificationResult | Verification results after converting a system to fixed point |
Temas
Visión general del flujo de trabajo de conversión iterativa a punto fijo
- Data Type Conversion Overview
Convert data types in your model to fixed point in one of three ways. - Best Practices for Fixed-Point Conversion Workflow
Use best practices when converting a model to fixed point. - Iterative Fixed-Point Conversion Using the Fixed-Point Tool
Use the Fixed-Point Tool to convert a system from floating point to fixed point.
- PASO 1: Prepare System for Conversion
- PASO 2: Collect Ranges
- PASO 3: Convert Data Types
- PASO 4: Verify New Settings
- PASO 5: Explore Additional Data Types
- Convert Floating-Point Model to Fixed Point
Use the Fixed-Point Tool to convert a floating-point model to fixed point. - The Command-Line Interface for the Fixed-Point Tool
Learn the differences between the command-line interface workflow and the Fixed-Point Tool workflow.
Preparar el sistema para la conversión
- Use the Fixed-Point Tool to Prepare a System for Conversion
Use the Fixed-Point Tool to check the system under design for compatibility with the conversion process. - Specify Behavioral Constraints
Use signal tolerances and model verification blocks to verify behavior of fixed-point implementation.
Recopilar rangos
- Fixed-Point Instrumentation and Data Type Override
Fixed-point instrumentation and data type override settings for gathering range information on your model. - Choosing a Range Collection Method
Choose from three methods for collecting ranges on which to base data type proposals. - How Range Analysis Works
Learn how the static analysis derives range information.
- Prevent the Fixed-Point Tool from Overriding Integer Data Types
Maintain integer data types in your model when using data type override.
Proponer tipos de datos
- How the Fixed-Point Tool Proposes Data Types
Learn how the Fixed-Point Tool proposes data types based on collected ranges and proposal settings. - Propose Data Types for Merged Simulation Ranges
Use the Fixed-Point Tool to merge results from multiple simulations, and propose data types based on the merged results. - How Hardware Implementation Settings Affect Data Type Proposals
Use the Fixed-Point Tool to propose word lengths for a model that implements a simple moving average algorithm.
Convertir tipos de datos
- Convert a Referenced Model to Fixed Point
Use the Fixed-Point Tool to log simulation minimum and maximum values for referenced models and propose data types based on a union of the collected ranges. - Bus Objects in the Fixed-Point Workflow
Learn how data type override behaves with bus objects, and how data types are determined for bus objects. - Autoscaling Data Objects Using the Fixed-Point Tool
Use the Fixed-Point Tool to convert a model that uses data objects for data type specification to fixed point. - Convert MATLAB Function Block to Fixed Point
Use the Fixed-Point Tool to convert a MATLAB® Function block to fixed-point.
Verificar los resultados
- Control Views in the Fixed-Point Tool
Information filtering, sorting, and analysis in the Fixed-Point Tool. - View Simulation Results
Use the Simulation Data Inspector to view simulation results and compare runs to verify your fixed-point design. - Explore Multiple Floating-Point to Fixed-Point Conversions
Iteratively explore different proposal settings to find the best floating point to fixed-point conversion. - Model Multiple Data Type Behaviors Using a Data Dictionary
Example showing how to use referenced data dictionaries to store multiple sets of data types for a model.
Solución de problemas
Blocks That Do Not Support Fixed-Point Data Types
Troubleshoot blocks that are not supported for fixed-point conversion.
Follow best practices and avoid unsupported MATLAB Function block features.
Best Practices for Working with Stateflow Charts in Automated Fixed-Point Conversion Workflows
Follow best practices for Stateflow® charts to avoid unexpected results.
Models That Might Cause Data Type Propagation Errors
Know which modeling practices could cause data type propagation errors after autoscaling.
Troubleshoot range analysis issues.
Avoid specifying conflicting design minimum and maximum values in your model.
Insufficient Design Range Information
Troubleshoot errors caused by insufficient design range information by providing additional input design minimum and maximum values.
Provide More Design Range Information
Troubleshoot insufficient design range information that prevents successful derived range analysis.
Troubleshoot Range Analysis of System Objects
Reconfigure a System object™, if necessary, so that ranges can be derived for the model.
The Fixed-Point Tool Did Not Propose Data Types
Troubleshoot when the Fixed-Point Tool does not propose data types.
Data Type Mismatch and Structure Initial Conditions
Example showing how to replace a structure initial condition with a
Simulink.Parameter
object.
Data Type Propagation Errors After Applying Proposed Data Types
Troubleshoot when the Fixed-Point Tool proposes data types that are not compatible with the model.