PX4 Write Parameter

Write PX4 system parameters

Since R2025a

Add-On Required: This feature requires the UAV Toolbox Support Package for PX4 Autopilots add-on.

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Libraries:
UAV Toolbox Support Package for PX4 Autopilots / PX4 Utility Blocks

Description

The Write Parameter block writes to the PX4 system parameter you specify, allowing easy parameter modification.

The block supports the parameters listed in PX4 Parameter Reference. You can also use your own custom parameters that align with the PX4 guidelines. For more information, see PX4 guidelines.

During Connected IO simulation, this block writes data to the peripherals of the hardware.

Examples

Getting Started with PX4 Write Parameter Block for PX4 Autopilots

Use the PX4 Write Parameter block to write parameters values to a PX4-based flight controller. This allows you to dynamically change flight parameters during simulation and deployment, enabling real-time tuning and configuration.

• Open Model

Ports

Input

Data — Parameter data

vector

Specify the data to write to the PX4 parameter.

Data Types: int32 | float

Parameters

Parameter Name — Name of the PX4 parameter

SL_FLOAT_PARAM (default) | one of the parameter name

Select the required PX4 system parameter from the drop-down list. The Parameter Name selected in this field must be one of the PX4 parameters; otherwise, the Status port outputs a value of 1, indicating that the parameter handle is invalid. Additionally, parameters requiring a system reboot are not supported.

Data Type — Data type of the PX4 parameter

FLOAT (default)

The data type is autopopulated based on the parameter you selected in the Parameter Name field.

Note

If the Data type that you select in this field does not match the actual data type of the PX4 parameter, the values written might lead to data type mismatch.

Output Status — Status of data transmission

off (default) | on

When you select the Output Status parameter, the block configures an output port. The output status indicates if the parameter that you specified is valid or not. A value of 0 indicates that the parameter handle is valid, and a value of 1 indicates that the parameter handle is invalid.

Version History

Introduced in R2025a