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Unable to load master firmware 
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Joined: Tue Nov 16, 2010 11:44 am
Posts: 2
Post Unable to load master firmware
Hi

Hoping someone will have an answer for me. Vex controller (pic). stopped working. I am unable to reload the master firmware I have tried using RobotC(2.01) and get error 'Failed to enter "Master CPU" Downloading mode'. I've also tried using the IFI loader and get 'Unknown device id [0]' error.

Batteries are full, cable is good (tested with another controller).

The microcontroller will accept a program and regular firmware some of the time, but the program will not run.

Any help is much appreciated, thanks in advance.

David Clark


Tue Nov 16, 2010 11:53 am
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Site Admin

Joined: Tue May 15, 2007 9:02 am
Posts: 403
Post Re: Unable to load master firmware
Hi David -

Sorry to hear about your controller issues. At this point, you've tried most of the recommended troubleshooting steps, but I do have two suggestions:
- Try hooking your robot up to a fully charged 9.6V Transmitter battery while you download the firmware. This will not damage the controller, just provide a little extra power.
- Try your luck with another computer.

Let me know if either of those suggestions helped.

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Jesse Flot
CMU Robotics Academy
ROBOTC Support


Tue Nov 16, 2010 12:27 pm
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Joined: Tue Nov 16, 2010 11:44 am
Posts: 2
Post Re: Unable to load master firmware
It worked to use a 9.6 volt battery plugged into the controller. Thanks for your help.


Tue Nov 16, 2010 1:35 pm
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Site Admin

Joined: Tue May 15, 2007 9:02 am
Posts: 403
Post Re: Unable to load master firmware
Glad to hear it! Keep in mind, though, if your robot consistently needs more power to operate as time goes on, it probably means one of two things:
1. The memory in your microcontroller is slowly going bad, requiring more power to use
2. Your batteries are slowly going bad, providing less power to the microcontroller

_________________
Jesse Flot
CMU Robotics Academy
ROBOTC Support


Wed Nov 17, 2010 10:18 am
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