Touchscreen filters / pressure detection

[Andy Green]

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Somebody in the thread at some point said:
| Andy Green wrote:
|> I gave Nelson the patch and a pointer to a PDF from TI that explained
|> the trick and computation needed,
|
| If you still have the link, could you please post it here ?
| This sounds like something quite interesting.

http://focus.ti.com/lit/an/sbaa155a/sbaa155a.pdf

I attach the implementation, but it's against the tracking tree of a few
months ago.

- -Andy
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