View unanswered posts | View active topics It is currently Fri Sep 25, 2020 4:40 pm

Reply to topic  [ 4 posts ] 
Need help downloading the ROBOTC Firmware 
Author Message

Joined: Mon Sep 13, 2010 9:57 pm
Posts: 1
Post Need help downloading the ROBOTC Firmware
our hub did not provide us with the serial - usb cable. I see at the end of the video that the robotC firmware can be loaded via the usb A-A cable, but when I try I get the following error:

"Bootload failed: Controller to respond to autobaud sequence during firmware bootload.

This indicates that the Cortex CPU is not properly communicating with the VEXNET system. The most common cause is VEXNET system failure or an obsolete version of VEXNET firmware. There were some interim buggy versions of VEXNET firmware that consistently caused this message -- try loading the latest VEXNET firmware on both the VEX Game Controller and the VEX Cortex controller"

I have followed the steps for loading the master cpu firmware as well as the game controller firmware, both seem to update just fine. I have a new battery on board and still the same result. Are there different step required with the usb A-A cable only?


Mon Sep 13, 2010 10:16 pm
Site Admin
Site Admin

Joined: Tue May 15, 2007 9:02 am
Posts: 409
Post Re: RobotC firmware problems
A few things to try...

Do you have the most recent version of ROBOTC (2.25?)?

We've learned that some PC USB ports have intermittent trouble maintaining a connection with the Cortex. Enabling message tracing in ROBOTC helps maintain that communication. You can find instructions for enabling message tracing on the last two pages of this document:

Jesse Flot
CMU Robotics Academy
ROBOTC Support

Tue Sep 14, 2010 8:58 am

Joined: Sun Sep 12, 2010 10:38 am
Posts: 4
Post Re: RobotC firmware problems
We had that same problem. We did the message tracing fix, but that only worked part of the time. Turns out, our USB A-A cable wasn't hitting all of the contacts on the Cortex. We just held it in with a little metal shunt and it worked perfectly.

Wed Sep 15, 2010 5:06 pm

Joined: Thu Oct 07, 2010 7:50 am
Posts: 2
Post Re: Need help downloading the ROBOTC Firmware
What is a metal shunt?

Thu Oct 07, 2010 7:53 am
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by ST Software for PTF.