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Author Topic: LED protection in TI-Nspires partially cracked  (Read 6035 times)

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Offline tangrs

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LED protection in TI-Nspires partially cracked
« on: March 17, 2013, 06:54:46 am »
Quote from: somewhere in TI's PTT documentation
The flashing LED is hardware-secure and cannot be impacted by coded software.

Lies! :P



At the moment, it only responds to writes to 90110b00 though - flashing still doesn't work. It probably needs more researching.

This one really had me stumped for a while. TI hid this one well. I've spent almost a year behind the scenes, on and off with this one.

A bit too long considering the final answer to the puzzle was actually pretty short :)

As to releases, I don't think I will until I'm convinced that this won't piss off TI. My interests in this was as a puzzle and its potential uses in the Linux kernel (as an indicator of hard drive activity for example) but somehow, I don't think TI thinks the same way.
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Offline ElementCoder

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Re: LED protection in TI-Nspires partially cracked
« Reply #1 on: March 17, 2013, 09:43:23 am »
Nice work. I had given up hope for the LED ever being cracked, but you did it. Disco time :P
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Offline floris497

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Re: LED protection in TI-Nspires partially cracked
« Reply #2 on: April 12, 2013, 03:16:08 pm »
so how do we use it??
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Offline Sorunome

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Re: LED protection in TI-Nspires partially cracked
« Reply #3 on: April 12, 2013, 07:04:01 pm »
Pretty neat, it is pretty impressive IMO how much hackable it is......(the nspire)
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Offline Darl181

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Re: LED protection in TI-Nspires partially cracked
« Reply #4 on: April 12, 2013, 07:07:52 pm »
So this means it might be possible to have Norse or similar on the CX eventually? Nice.
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Offline floris497

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Re: LED protection in TI-Nspires partially cracked
« Reply #5 on: April 13, 2013, 06:19:10 am »
i was thinking of an indicator for the battery while it charges.
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Offline ben_g

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Re: LED protection in TI-Nspires partially cracked
« Reply #6 on: April 13, 2013, 10:32:28 am »
So you've spent A YEAR trying to control a tiny little LED light?
I'm sorry, but I don't get why you would go to all that trouble instead of simply using an onscreen indicator.
I hope this didn't sound rude to you. I just don't really see the point in spending so much time for something that simple.
EDIT: Not simple as in simple to do, but simple in that the effect seems very limited.
« Last Edit: April 13, 2013, 11:19:28 am by ben_g »
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Offline Lionel Debroux

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Re: LED protection in TI-Nspires partially cracked
« Reply #7 on: April 13, 2013, 10:41:42 am »
Quote
I don't get why you would go to all that trouble instead of simply using an onscreen indicator.
There are obvious uses for that tiny little LED, though, for instance USB MSD activity indication.

Quote
I hope this didn't sound rude to you.
It probably does...

Quote
I just don't really see the point in spending so much time for something that simple.
It's not that simple, mind you, otherwise it would have been done a couple years ago.
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Offline floris497

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Re: LED protection in TI-Nspires partially cracked
« Reply #8 on: April 13, 2013, 11:39:59 am »
Quote from: ben_g on April 13, 2013, 10:32:28 am
So you've spent A YEAR trying to control a tiny little LED light?
I'm sorry, but I don't get why you would go to all that trouble instead of simply using an onscreen indicator.
I hope this didn't sound rude to you. I just don't really see the point in spending so much time for something that simple.
EDIT: Not simple as in simple to do, but simple in that the effect seems very limited.

if you read carefully he said this was a PUZZEL for him! and it is nice he won it :)
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