TOUCH Screen coordinate Jitter .CRAZY!!!!!

peigao — Wed, 05 Jun 2013 03:16:31 GMT

we used the i.MX536&DA9053 design a hand-in meter.it has an 5.6" LCD SCREEN combine with a touch screen .we use the DA9053 touch screen interface.

in the HIM. a visual keyboard exist. but when we use finger touch the visual keyboard frame.it keep jitter and never-ending. in the SCH ,the touch screen path is very short.we use 4-cap on the X+,X-,Y+,Y- to filtering the jitter. but has no effect.evreyone,have u used have this problem?

Re: TOUCH Screen coordinate Jitter .CRAZY!!!!!

jimmychan — Wed, 05 Jun 2013 07:17:03 GMT

1. please add the tslib package in the Package List in LTIB Configuration.

2. please try to delete the pointercal file and do the calibration again.

Before run the ts_calibrate, please try to "export" the followings:

export TSLIB_ROOT=/usr

export TSLIB_TSDEVICE=/dev/input/event2 (please change it if your touchscreen device node is different)

export TSLIB_CALIBFILE=/etc/pointercal

export TSLIB_CONFFILE=$TSLIB_ROOT/etc/ts.conf

export TSLIB_PLUGINDIR=$TSLIB_ROOT/lib/ts

export TSLIB_CONSOLEDEVICE=none

export TSLIB_FBDEVICE=/dev/fb0

The existing /etc/ts.conf should look like this.

module_raw input

module pthres pmin=1

module variance delta=30

module dejitter delta=100

module linear

3. If the GUI is Ubuntu, please read the i.MX5x_EVK_Ubuntu_9.10_StartupGuide.pdf or i.MX5x_EVK_Ubuntu_10.04_StartupGuide.pdf

4. you can try to use the evtest to check the touchscreen input.

i.MX Processors中的主题 TOUCH Screen coordinate Jitter .CRAZY!!!!!

TOUCH Screen coordinate Jitter .CRAZY!!!!!

Re: TOUCH Screen coordinate Jitter .CRAZY!!!!!