Programming instructions

ROBOTC
VEX Cortex Conguration over USB • 1
© 2011 Carnegie Mellon Robotics Academy / For use with VEX Robotics Systems
VEX Cortex Conguration over USB
You will need:
• 1 VEX Cortex Microcontroller with one 7.2V Robot Battery
• A computer with ROBOTC for Cortex and PIC installed
• 1 USB A-to-A Cable
The VEX Cortex is a fully programmable device, and is what enables you to incorporate motors,
sensors, an LCD screen, and remote control signals all in one robot. Inside of the Cortex,
there are two separate processors; a user processor handles all of the ROBOTC programming
instructions, and a master processor controls lower-level operations, like motor control and
VEXnet communication. This document is a guide for downloading the Master CPU rmware and
ROBOTC rmware to the VEX Cortex using the USB A-to-A cable.
1. Leaving the POWER switch in the OFF position, connect your Cortex to the computer using the USB
A-to-A cable. Once the cable is attached, move the POWER switch to the ON position.
1a. ConnecttheCortextoyourPC
Use the USB A-to-A cable to connect your Cortex
to your PC.
Note: The order detailed in this step is crucial.
When the Cortex is powered on, it immediately
tries to determine how it is connected (over VEXnet,
USB, or no connection). Some power is provided
to the Cortex over USB, which will allow it to
determine that it is connected to your computer.
1b. TurntheCortexON
Make sure a 7.2V Robot battery is connected
and move the POWER switch on the Cortex to
the ON position.
Note: If your Cortex is connected to a mobile
robot, it’s recommended that you prop the
robot up to prevent its wheels from making
contact with a surface. The motors may turn on
and off during the rmware download process.
Setup