topic Re: touchscreen tsc2004 android not working in i.MX Processors

touchscreen tsc2004 android not working

pravverma — Fri, 09 Mar 2018 13:55:30 GMT

We are using imx_7.1.2 Android Nougat release for our custom board.

In the custom board tsc2004(12 bit ADC) based touchscreen is used. Screen resolution is 480x272.
So, I have performed the calibration using tslib.

I am able to read the calibrated touch coordinates using getevent(as shown below), but at android GUI, there is no action performing on touching. I am using the tsc2004.c driver came with the kernel release and performing the callibration in driver before sending the coordinates to userspace.

sabresd_6dq:/ # getevent -lp /dev/input/event0
add device 1: /dev/input/event0
name: "TSC200X"
events:

(Touchscreen Top Left value)
KEY (0001): BTN_TOUCH*
ABS (0003):

ABS_X : value 13, min 0, max 4095, fuzz 4, flat 0, resolution 0
ABS_Y : value 15, min 0, max 4095, fuzz 7, flat 0, resolution 0
ABS_PRESSURE : value 336, min 0, max 2048, fuzz 2, flat 0, resolution 0
input props:
<none>

(Touchscreen Top Right Value)
sabresd_6dq:/ # getevent -lp /dev/input/event0
add device 1: /dev/input/event0
name: "TSC200X"
events:
KEY (0001): BTN_TOUCH*
ABS (0003):

ABS_X : value 464, min 0, max 4095, fuzz 4, flat 0, resolution 0
ABS_Y : value 14, min 0, max 4095, fuzz 7, flat 0, resolution 0
ABS_PRESSURE : value 399, min 0, max 2048, fuzz 2, flat 0, resolution 0
input props:
<none>

(Touchscreen Bottom Right Value)
sabresd_6dq:/ # getevent -lp /dev/input/event0
add device 1: /dev/input/event0
name: "TSC200X"
events:
KEY (0001): BTN_TOUCH*
ABS (0003):

ABS_X : value 462, min 0, max 4095, fuzz 4, flat 0, resolution 0
ABS_Y : value 250, min 0, max 4095, fuzz 7, flat 0, resolution 0
ABS_PRESSURE : value 307, min 0, max 2048, fuzz 2, flat 0, resolution 0
input props:
<none>

(Touchscreen Bottom Left Value)
sabresd_6dq:/ # getevent -lp /dev/input/event0
add device 1: /dev/input/event0
name: "TSC200X"
events:
KEY (0001): BTN_TOUCH*
ABS (0003):

ABS_X : value 8, min 0, max 4095, fuzz 4, flat 0, resolution 0
ABS_Y : value 247, min 0, max 4095, fuzz 7, flat 0, resolution 0
ABS_PRESSURE : value 299, min 0, max 2048, fuzz 2, flat 0, resolution 0
input props:
<none>

Idc file:

======

sabresd_6dq:/ # cat /system/usr/idc/TSC200X.idc
touch.deviceType = touchScreen
touch.orientationAware = 1

touch.size.calibration = none
touch.orientation.calibration = none

Please help.

Thanks,

Praveen

Re: touchscreen tsc2004 android not working

diegoadrian — Tue, 13 Mar 2018 20:57:35 GMT

Hello,

You can see the below community discussions. Probably some of the information located there can help you.

tsc2004 touchscreen driver on Jelly Bean(JB) jb4.2.1_1.0.0-alpha

https://community.nxp.com/thread/293210

I hope some of that information can help you.

Best regards,

Diego.

Re: touchscreen tsc2004 android not working

赵振业 — Tue, 10 Jul 2018 03:47:35 GMT

Hi praveen verma :

I met same issue, Could you tell how to reslove this please.thanks

Re: touchscreen tsc2004 android not working

pravverma — Mon, 16 Jul 2018 02:36:46 GMT

Hi,

There were two things, I found to make it work:

1. No need to callibrate the touchscreen in linux driver. Although driver is sending touch coordinates(0-4096). Android will handle the coordinates accordingly and map the touchscreen to the display resolution.

2. I found that touchscreen was rotated by 90 degree(top left corned cordinates are (0,90) in place of (0,0)). So I modified the driver to correct the coordinate before passing to the userspace.

Re: touchscreen tsc2004 android not working

赵振业 — Tue, 17 Jul 2018 02:17:36 GMT

Hi praveen verma :

Thanks very much,It is helpful for me.

I made it work now.