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Linux/LDCTOUCHCOMCOILEVM: touchscreen tslib calibrate ,LCD has nothing show

Part Number: LDCTOUCHCOMCOILEVM

Tool/software: Linux

AM335x+Tslib

I driver one serial touchscreen through uart2 (RS232), and the driver is writed refred touchit213.c .

The device node is /dev/event0 ,and something is print when cat /dev/event0 .

But the LCD has nothing to show when calibirate using Tslib.

X Y loaction is print when run ts_test .

Is anyone give me  some suggestions??