Author Topic: LED protection in TI-Nspires partially cracked  (Read 5468 times)

0 Members and 1 Guest are viewing this topic.

Offline tangrs

  • LV5 Advanced (Next: 300)
  • *****
  • Posts: 229
  • Rating: +98/-0
    • View Profile
    • tangrs blog
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.

Offline ElementCoder

  • LV7 Elite (Next: 700)
  • *******
  • Posts: 611
  • Rating: +42/-2
    • View Profile
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

Some people need a high five in the face... with a chair.
~EC

Offline floris497

  • LV5 Advanced (Next: 300)
  • *****
  • Posts: 210
  • Rating: +8/-0
    • View Profile
Re: LED protection in TI-Nspires partially cracked
« Reply #2 on: April 12, 2013, 03:16:08 pm »
so how do we use it??

Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
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)

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline Darl181

  • «Yo buddy, you still alive?»
  • CoT Emeritus
  • LV12 Extreme Poster (Next: 5000)
  • *
  • Posts: 3408
  • Rating: +305/-13
  • VGhlIEdhbWU=
    • View Profile
    • darl181.webuda.com
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.
Vy'o'us pleorsdti thl'e gjaemue

Offline floris497

  • LV5 Advanced (Next: 300)
  • *****
  • Posts: 210
  • Rating: +8/-0
    • View Profile
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.

Offline ben_g

  • Hey cool I can set a custom title now :)
  • LV9 Veteran (Next: 1337)
  • *********
  • Posts: 1002
  • Rating: +125/-4
  • Asm noob
    • View Profile
    • Our programmer's team: GameCommandoSquad
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 »
My projects
 - The Lost Survivors (Unreal Engine) ACTIVE [GameCommandoSquad main project]
 - Oxo, with single-calc multiplayer and AI (axe) RELEASED (screenshot) (topic)
 - An android version of oxo (java)  ACTIVE
 - A 3D collision detection library (axe) RELEASED! (topic)(screenshot)(more recent screenshot)(screenshot of it being used in a tilemapper)
Spoiler For inactive:
- A first person shooter with a polygon-based 3d engine. (z80, will probably be recoded in axe using GLib) ON HOLD (screenshot)
 - A java MORPG. (pc) DEEP COMA(read more)(screenshot)
 - a minecraft game in axe DEAD (source code available)
 - a 3D racing game (axe) ON HOLD (outdated screenshot of asm version)

This signature was last updated on 20/04/2015 and may be outdated

Offline Lionel Debroux

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2135
  • Rating: +290/-45
    • View Profile
    • TI-Chess Team
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.
Member of the TI-Chess Team.
Co-maintainer of GCC4TI (GCC4TI online documentation), TILP and TIEmu.
Co-admin of TI-Planet.

Offline floris497

  • LV5 Advanced (Next: 300)
  • *****
  • Posts: 210
  • Rating: +8/-0
    • View Profile
Re: LED protection in TI-Nspires partially cracked
« Reply #8 on: April 13, 2013, 11:39:59 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 :)