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Gucky_der_Mausbiber
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Joined: 10 Apr 2005
Posts: 359
Location: Wetzlar, Hessen
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 Posted: Wed Jul 15, 2009 12:21 pm Post subject: X, tslib, s3c2440 & touchscreen -> not working in X |
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Hello,
I've a problem with an embbeded-arm-device (s3c2440) and the attached 4-Wire-Touchscreen - it won't work with xorg-server and twm/matchbox as window-manager.
I will give you all information I have found about this problem and perhaps somebody can tell me what to do to get it working.
First of all two Download-Links to get datasheets of the device itself and the attached touchscreen:
To get gentoo running i used a 2GB sd-card with gentoo-rootfs. There are only few small problems to get it working, so after a few days i see gentoo booting on the touchscreen - very nice. 
Next step was to compile and install the X-Window-System on the device.
So, i emerged "xorg-server" with the USE-Flag "tslib" | Code: | | USE="tslib" emerge -av xorg-server |
and with | Code: | | INPUT_DEVICES="tslib" |
in the "/etc/make.conf" ... damm, it takes about 6 hours to compile xorg-server on the 400MHz device (cross-compiling X doesn't work), and altogether (all other packages) it takes about 12 hours to compile the entire xorg-server ... but after all, it works.
I tested the X-Windows with "startX"-command ... X is comming up and running twm als window-manager.
Perfect for the first days of work.
Okay, now i want to see if the touchscreen works in X & twm, so i tried to select an window in twm with touching the display - nothing. Tried to move the mouse with touching the display - nothing.
So I tried another window-manager, called "matchbox" (special wm for small-devices). But after a sucessfull start the touchscreen doesn't work. Matchbox itself will run fine.
Okay, bad, touchsreen doesn't work "out-of-the-box". 
So, i googled the web about tslib, 4-wire-touchscreens and xorg-server (because matchbox is altough using X-Window-System) and found some interesting things.
First was to apply "/dev/input/ts" with "mknod" , seems to be a kind of symlink from "/sys/devices/virtual/input/input0". After this, I export 5-6 tslib-variables so that tslib knows which interface to use and where the conf-file is saved.
First test was an simple if i touch the display know, there appears different kinds of characters. Fine, seems to work.
Next I want to calibrate my touchscreen | Code: | | ts_calibrate /etc/ts.calib |
Now a black screen appears with a cross alternating in each corner. Afters touching the crosses the tool quit sucessfully.
So, i can say, touchscreen is working, and tslib has recognized the touchscreen and works with it.
After this I tried to start twm/matchbox again to see if the touchscreen is working now (because tslib works fine now and USE-Flags are set), but nothing. In both wm's (matchbox/twm) the touscreen do not reacted on any inputs.
So, I don't know what i did wrong?
I use the tslib and it seems to work great. I put in the tslib USE-Flag and set "tslib" as an input_device in the make.conf. I calibrated my touchscreen sucessfully with tslib-tool. But in my wm's, nothings works.
Here are now some technical infos about the device, first an extract of the dmesg, showing that the kernel recognized the touchscreen | Code: | s3c2410 TouchScreen successfully loaded
input: s3c2410 TouchScreen as /devices/virtual/input/input0
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here is a look at the input-devices | Code: |
mini2440 ~ # cat /proc/bus/input/devices
I: Bus=0013 Vendor=dead Product=beef Version=0101
N: Name="s3c2410 TouchScreen"
P: Phys=
S: Sysfs=/devices/virtual/input/input0
U: Uniq=
H: Handlers=event0
B: EV=b
B: KEY=0
B: ABS=1000003 |
PS: If i try to auto-configure the xorg-conf with "Xorg -configure" it ends up with an error "No devices found", so i must use the internal-autobuild xorg.conf. But i don't know how to create a xorg.conf for that device "by-hand", because i don't what to fill in for the graphic-device or the screen-section.
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intel quad core, nvidia 8800gts, intel hd audio+sb live, gnome 2.24 |
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pilla
Bodhisattva
Joined: 07 Aug 2002
Posts: 7729
Location: Underworld
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| Posted: Wed Jul 15, 2009 2:09 pm Post subject: |
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No crossposting, follow-ups here
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"I'm just very selective about the reality I choose to accept." -- Calvin |
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