Gamepad Button

Represent one button on VEX gamepad and read logical value

• Library:

• Simulink Coder Support Package for ARM Cortex-based VEX Microcontroller / Gamepad

• 

Description

The Gamepad Button block is used to represent one of the 12 buttons on the VEX^® gamepad. The block reads the corresponding logical value (1 or 0) based on whether the button is pressed or released.

Ports

Input

Port_1 — Digital signal used during simulation

1 | 0

Connect a source block, such as the Gamepad Simulator block from the Utilities library in Simulink^® Support Package for ARM^® Cortex^®-based VEX Microcontroller.

Dependencies

This port appears only when you select the Add input port for simulation parameter.

Data Types: Boolean

Output

Port_1 — Logical value representing state of button

1 or 0

When you press the button, the block output is 1; otherwise (in a released state of the button), the block output is 0.

During simulations without the hardware, this block emits zeroes if there is no source block connected to the input port (see Block Produces Zeros or Does Nothing in Simulation).

Data Types: Boolean

Parameters

Joystick — Select joystick number

1 (default)

This parameter is read only. You can have a pair of VEX gamepads to control the peripherals connected to the VEX microcontroller. However, in the VEX Robotics and the BEST Robotics competitions, teams are allowed only one gamepad. Therefore, the Joystick is set to 1 by default, and it cannot be changed.

Channel (5 to 8) — Select channel or button group

5 | 6 | 7 | 8 (default)

Select the channel or button group on the VEX gamepad. The VEX gamepad has four channels – 5, 6, 7, and 8 – which contain a total of 12 buttons.

Button (Down, Up) — Select button in selected channel

Down (default) | Up | Right | Left

The options for this parameter vary depending on the Channel that you select. Channels 5 and 6 have Up and Down buttons only, while channels 7 and 8 have Up, Down, Right, and Left buttons. Before you make the selection, review the labeling of the buttons on the VEX gamepad.

Add input port for simulation — Add input port to simulate logical value of button

off (default) | on

Select this check box to add an input port to specify a logical value of the button during simulation.

Sample time — Sample time for obtaining logical value of button

0.02 (default) | positive real number

How often the Gamepad Button block should read the logical value of the button, specified in seconds. The default value is 0.02 seconds.

Dependencies

If you select the Add input port for simulation check box, the Sample time parameter is hidden and its value is inherited .

Model Examples

Servo Control using a Gamepad Button

Use Simulink Coder Support Package for ARM Cortex-based VEX Microcontroller to control a servo motor using a digital button on the VEXnet Joystick.

Extended Capabilities

C/C++ Code Generation

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

During code generation, any simulation block that is connected to the input port of the Gamepad Button block is ignored and has no effect on the generated code.