[Build] Touch Panels

[dpc]

nils at shkoo.com writes:

> On Mon, 28 Sep 2009, dpc wrote:
>>> the calibration they supply for linux is limited to determining the
>>> minimum and maximum x and y values.
>>
>> hmmm... i have to go back over the driver objdump (since i'm just
>> playing along from home) to see if this makes a difference.
>
> To elaborate, the touchscreen sends 2 position values between 0x0000
> and 0x3FFF.  The inexio-supplied (closed source) linux calibration
> tool calibrates how those map to display coordinates.  I guess it is
> closed source and I didn't reverse engineer what it did, so it might
> be sending some data back over the serial port to the touchscreen to
> do some additional calibration.

that's what i was wondering. nothing jumped out at me, but i only did a
glance to see if there was anything 'odd' going on.

> The inexio driver that I'm using now (http://repo.or.cz/w/inexio.git)
> just uses 0x0000,0x0000 as the upper left corner and 0x3FFF,0x3FFF as
> the bottom right corner.  It doesn't look like it does any calibration
> compensation at all.

gotcha.

\p

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