Restoring the LaunchPad problem

Hello Carlos,

Did you use this method, LM Flash Other Utilities -> Debug Port Unlock -> Fury, Dust Devil, and Blizzard Classes and hold the reset button down for the required time?

Thanks,

I pressed down the reset button for some seconds before powering the LaunchPad (connecting the USB cable) but nothing

Did you use the EEPROM on your device ? If yes, you may be hit by an Errata - "If the EEPROM is programmed, both the Flash memory and EEPROM will be unable to be programmed after a POR"

I thought that only pertained to the LM3S series.  Which errata are you referring to?

Erratum 7.4 - http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spmz636g&fileType=pdf

That errata covers the LM4F2x series.  I believe the device in question is the LM4F120 LaunchPad.

Yes I used the EEPROM, the errata sheet is for another device im using LM4F120, earlier today after a while I tried to compile the same code and worked normally I was surprised, ran it again and same failure. I started to write on the 0x400 direction, I dont think there is a problem with that.

Is this problem only occurring when you compile the same code?

When it runs, do you have any problems if you power it down and reset it, will it still run?

Check your USB cable, try using a different one.

Well that just happened once (yesterday) I didnt tried to power it down and reset it but if happens again, I'll check that. I did use another cable to eliminate that option.

As the USB cable is receiving scrutiny - perhaps attention should focus also upon the soldering & integrity of the launchpad's mating USB connector.  Many have reported failed/failing solder joints - which may well contribute to your "apparent" intermittent operation...