I have been playing with touchscreens for the last couple weeks. I noticed the following:
For both 4.3" and 7" resistive touchscreens I have, the jitter is significantly better in the default Angstrom versus Debian. Angstrom jitters with around 5pixels of the touched point, Debian is >20pixels Looking at Debian, it seems to have a much newer version of the touchscreen driver than Angstrom does. I believe this is the revision angstrom uses: Last time steps_to_configure was available: https://github.com/torvalds/linux/commit/af9c2fe3740fe8dac05eede8805d9aaa45972cb6 Change from steps_to_configure to coordinate_readouts: https://github.com/torvalds/linux/commit/0396310b0eba71595c1151ce7c8fde7a9f33f719 Angstrom's DTC files for touchscreen refer to 'steps-to-configure' where Debian's has the newer 'coordinate-readouts'. I would be happy if the quality of touch input that I get from Angstrom existed in Debian, so I'll try to compile the old driver, then recompile my DTC files and use steps_to_configure and report back. On Friday, 14 March 2014 15:19:28 UTC-7, Piotr Murawski wrote: > > 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++; > *&* > ... -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
