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GeReV / adonit_linux

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stylus not near mouse cursor. #1

Open fundies opened 9 years ago

fundies commented 9 years ago

When I touch the stylus to the screen it moves the cursor however the cursor is a good 3-5 inches away from the stylus.

Not sure how to debug this... Not much info in the cli.

I'm on ubuntu 13 32bit

greg@greg-laptop:~/adonit_linux$ sudo ./adonit --pen 00:17:53:68:60:DE --touchreen /dev/input/by-id/usb-ELAN_Touchscreen-event-if00

adonit.c built at 10:51:36 on Aug 23 2014

Opening uinput device... uinput device created successfully.

fundies commented 9 years ago

I can calibrate it with xinput_calibrator however the setting disapears any time I reconnect it.

userx14 commented 5 years ago

Hi I'm having the same issue, it is caused by the values of the maximum touchscreen resolution defaulting to 4096 for both x and y for the new device. By installing evtest and selecting the Adonit Jot Touch device I noticed that there is a missmatch between the original touchscreen event code 0 (ABS_X) MAX value which leads, depening on the touchscreen, to a missmatch between the touch position and the reported position.

In uinput.c line 79 and 80: /* common */ dev->absmax[ABS_PRESSURE] = 2048; dev->absmax[ABS_X] = 4096; dev->absmax[ABS_Y] = 4096; ` dev->absmin[ABS_PRESSURE] = 0; dev->absmin[ABS_X] = 0; dev->absmin[ABS_Y] = 0;`

We would need to read the absmax values out of the old touchscreen event device and use those as these parameters...