VEX2 Competition

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Main >> CORTEX >> Competitions with ROBOTC

In normal ROBOTC programming, every program is based around a “task main” function, as shown below:
task main()

In a competition program, things are a little different. To keep things simple, however, a Competition Template program is built into ROBOTC for use in VEX Competitions. The template provides a common starting point for teams when competing in an event. Rather than a single “main” task, the template has three sections, each matched to a specific section of the competition:

  • void pre_auton() – For running code that the robot needs to get “set up” before the competition begins
  • task autonomous() – For code the robot should run during the autonomous period (20 seconds by default)
  • task usercontrol() – For code the robot should run during the user control period (120 seconds by default)

The template and its accompanying “include” file handle the background work for the competition, such as monitoring the duration of each phase during a match, and communicating with the Vex Field Controller. All you need to do is tell the robot what to do in each phase.

Open a Competition Template

To open a competition template:

Open comp 1.png
Note: The competition template is a read-only file, so be sure to save a copy of the file somewhere else on your computer.

Set Up Competition Control and Timing

#pragma competitionControl(Competition )
#pragma autonomousDuration(20 )
#pragma userControlDuration(120)

With ROBOTC, the competition control is completely user defined and controlled via software, so there are no jumpers required for testing. By changing these settings, the template can be adapted to work with any competition. The three lines above set the VEX controller into the “competition” mode and specify the timing for the match.

#pragma competitionControl(competition_mode) – Controls the Competition mode that the Vex robot will function in. There are two different competition modes that you can pass to this statement:

  • OFF – Standard setting. No competition controls.
  • Competition – Competition mode. The VEX will respond to Field Controller commands and switch between Autonomous and User Control modes at the competition-specified times. Use this mode for competitions.
  1. pragma autonomousDuration(time_in_seconds) - Defines the duration of the autonomous phase of a VEX competition. Poor performance may result if this setting does not match the Field Controller settings.
  1. pragma userControlDuration(time_in_seconds) - Defines the duration of the user control phase of a VEX competition. Poor performance may result if this setting does not match the Field Controller settings.