Gamepad Accelerometer

Read analog value from VEX gamepad accelerometer

Add-On Required: This feature requires the Simulink Coder Support Package for ARM Cortex-based VEX Microcontroller add-on.

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

Description

The Gamepad Accelerometer block is used to read an analog value from the VEX^® gamepad accelerometer based on the axis of rotation (x or y) of the gamepad.

The output for this block ranges from –128 to 127. There are two accelerometers on the VEX gamepad, and their axes are aligned perpendicular to each other. Rotation of the VEX gamepad along either the horizontal axis (1) or the vertical axis (2) results in an output value in the range –128 to 127. You can use this analog value to control peripherals, such as a DC motor, that are connected to the VEX microcontroller.

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 value from accelerometer

integer in [ –128 127]

The block output ranges from –128 to 127 based on the axis selected and the orientation of the gamepad.

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 — 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 is set to 1 by default, and it cannot be changed.

Axis of Rotation (X-axis = 1, Y-axis = 2) — Select axis of rotation of gamepad

1 | 2 (default)

The axis of rotation determines which accelerometer is used to generate the output value. Select 1 for the horizontal x-axis and 2 for the vertical y-axis.

Add input port for simulation — Add input port to simulate input acceleration

off (default) | on

Select this check box to add an input port to specify an analog value for acceleration.

Sample time — Sample time for obtaining analog value of acceleration

0.02 (default) | positive real number

How often the Gamepad Accelerometer block should read the values from the gamepad, 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.

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

Version History

Introduced in R2016a