Gamepad Joystick

Represent one control axis on x-yanalog VEX gamepad joystick and read values

• Library:

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

• 

Description

The Gamepad Joystick block is used to represent one of the control axes of an x-y analog joystick on the VEX^® gamepad. The block reads the corresponding analog value based on the position of the joystick along that axis. There are two analog joysticks on the VEX gamepad with two control axes (x-y) on each joystick.

Ports

Input

Port_1 — Analog signal used during simulation

integer in [ –128 127]

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: double

Output

Port_1 — Analog signal corresponding to position of joystick along axis

integer in [ –128 127]

The block output ranges from –128 to 127 based on the position of the joystick along the specified control axis. A value of 0 indicates that the joystick has not been moved along the axis.

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

Data Types: double

Parameters

Joystick Number — 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 BEST Robotics competitions, teams are allowed only one gamepad. Therefore, Joystick Number is set to 1 by default, and it cannot be changed.

Analog Channel (1 to 4) — Select control axis of x-y analog joystick

1 (default)

Select the control axis to read on the VEX gamepad. The right joystick has horizontal axis labeled 1 and its vertical axis is labeled 2. The left joystick has horizontal axis labeled 3 and its vertical axis is labeled 4. Based on your selection, the mask icon of the block is updated in the Simulink Editor.

Add input port for simulation — Add an input port to simulate joystick

off (default) | on

Select this check box to add an input port to specify an analog value during simulation.

Sample time — Sample time for obtaining analog value from joystick

0.02 (default) | positive real number

How often the Gamepad Joystick block should read the values from the gamepad joystick specified in seconds. The default value is 0.02 seconds.

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

Model Examples

Tank Robot Control using VEXnet Gamepad

Use Simulink Coder Support Package for ARM Cortex-based VEX Microcontroller to control 2-wheeled tank robot using a VEX wireless controller.

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 Gamepad Joystick block is ignored and has no effect on the generated code.