Thank you very much for your help. The Matrix issue has been solved, but there are new problems.
I am able to successfully calibrate my touchscreen using ts_calibrate and then I test it with ts_test and everything is fine: the crosshair pointer on the screen exactly follows my finger.
But when I run the matrix,touch points and crosshair pointer always not coincide.
we try to set environment variables QT_QPA_GENERIC_PLUGINS to tslib:/dev/input/event0 then run Matrix still does not work
the error message is as follows:
No such plugin for spec "tslib:/dev/input/event0"
And we have not found libqtslibplugin.so in v2.00.00.00 filesystem.
so, here are one problem need TI help:
On RSB4221(AM3358), how to successfully calibrate touchscreen when runing the matrix and Qt demo
Looking forward TI reply, thanks advance.