[PATCH v2] ARM: pxa: magician: Add support for ADS7846 touchscreen
Petr Cvek
petr.cvek at tul.cz
Mon Mar 13 00:51:52 PDT 2017
Dne 13.3.2017 v 01:25 Petr Cvek napsal(a):
> This patch adds a support for ADS7846 touchscreen driver.
>
> The basic functionality was tested, x_plate_ohms and y_plate_ohms were
> physically measured. The value pressure_max was empirically set to match
> the measured range, which is affected by x_plate_ohms and ADS samples.
>
> The value of keep_vref_on doesn't seem to have any effect on measurements
> (at least on T-Mobile MDA Compact PM10A device). Leave it to zero so
> the internal and external Vref sources will not collide.
Actually not, without vref on the touchscreen seems to be highly jittery.
Sending version 3 (fixed patch and a new commit message).
Petr
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