TOUCH Screen coordinate Jitter .CRAZY!!!!!

[peigao]

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?

[jimmychan · Accepted solution]

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.