How To Get Vertical Retrace Interrupt?

[dhns]

Is there a method to have a user space daemon synchronize with the vertical retrace on the standard Sharp kernel (2.4.x)?

The background is that I have a daemon that directly reads out the sharp_ts (touchscreen) device but shows a lot of jitter. Now, I guess that it is an interference with the LCD device and the Touchscreen resistive planes which drive the ADC.

So I want to test if I can synchronize reading of the ts device with the LCD.

Qt must have solved that since it does not show the jitter.

[Edited]
I have found two links for the OpenBSD zts.c driver (kernel) apparently addressing the same problem:
http://archives.neohapsis.com/archives/ope...05-04/0391.html
http://www.openbsd.org/cgi-bin/cvsweb/src/...x-cvsweb-markup

But this is in kernel and I don't want to write a new touch screen driver :-(

Any hints are welcome.

-- hns

[ev1l]

At an OSS meeting in Austria I saw a couple of OpenBSD guys running OBSD on the SL-C3000. Your best bet might be to post on their kernel devel mailing list.

[dhns]

At an OSS meeting in Austria I saw a couple of OpenBSD guys running OBSD on the SL-C3000. Your best bet might be to post on their kernel devel mailing list.
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Many thanks for the answer.

I have already looked what they are doing. They have a special touchscreen driver - but that can't be ported back to Linux. And they might not know anything about the Linux 2.4.x system...

And what I unfortunately can't do is to install a different system just to get the touchscreen coordinates debounced  

-- hns