There is a part in the driver (ti_am335x_tsc.c):
config = STEPCONFIG_MODE_HWSYNC |
STEPCONFIG_AVG_16 | ts_dev->bit_yp |
ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
STEPCONFIG_INP(ts_dev->inp_xp);
titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
titsc_writel(ts_dev, REG_STEPDELAY(end_step),
STEPCONFIG_OPENDLY);
end_step++;
* config |= STEPCONFIG_INP(ts_dev->inp_yn);*
There is possible bug, with using "OR". It does not show up when XP -> AN0
and YN -> AN3 because 0 is ORed to 3 (fortunately). With other X/Y plate
connections, z2 might be totally wrong.
Regards,
Piotr.
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