Callback Button

Execute MATLAB code based on user input

• Library:

• Simulink / Dashboard

Description

The Callback Button block executes MATLAB^® code based on user input. The Callback Button block reacts to clicks and presses from the user. You can specify separate code to execute for each action. The Callback Button block repeats the code specified for the press action at a specified rate as long as you continue to press the button.

The Callback Button block registers a click when you release the left mouse button with the cursor on the Callback Button. The code for a press executes when you click the Callback Button and hold for the specified Press Delay.

Double-clicking the Callback Button block does not open its dialog box during simulation and when the block is selected. To edit the block's parameters, you can use the Property Inspector, or you can right-click the block and select Block Parameters from the context menu.

Parameters

Button Text — Text on button

'Callback Button' (default) | character array

Text that appears on the button.

Mouse Action — Mouse action to run code

'ClickFcn' (default) | 'PressFcn'

Mouse action that causes the MATLAB code to execute.

• Select ClickFcn to view and edit the code that executes when the Callback Button block is clicked.

• Select PressFcn to view and edit the code that executes when the button is pressed.

MATLAB Code — Code to execute based on user input

empty (default) | MATLAB Code

MATLAB code that executes based on user input.

Dependency

The MATLAB code displayed depends on the Mouse Action parameter selection.

• Select ClickFcn to view and edit the code that executes when the Callback Button block is clicked.

• Select PressFcn to view and edit the code that executes when the button is pressed.

Press Delay (ms) — Time to hold button for press

500 (default) | scalar

Amount of time required to cause the PressFcn code to execute.

Dependency

Press Delay (ms) is only visible when PressFcn is selected as the Mouse Action.

Repeat Interval (ms) — Time interval to repeat PressFcn code

0 (default) | scalar

Time interval after which the PressFcn code executes again if the Callback Button block is still pressed.

Dependency

Repeat Interval (ms) is only visible when PressFcn is selected as the Mouse Action.

Model Examples

Initialize Your Model Using the Callback Button Block

Use the Callback Button block to perform initialization routines on your model.

Open Model

Control a Parameter Value with Callback Button Blocks

Models control of a system that consists of two masses attached on either side of a spring.

Open Model

Block Characteristics

Data Types
Direct Feedthrough	no
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Dashboard blocks are ignored for code generation.