Bruce,

Have you tried referring to this thread?

http://www.logicpd.com/su.../viewtopic.php?t=390

Thanks,

Yes, in fact I went through that thread carefully, and several other threads before posting. The particular thread you refer to would be relevant if I was looking for LCDC parameters.

However, my message was looking for parameters for the Touch driver default parameters for a particular display, the 6.4" (5) display.

After about 20 minutes of playing around with the stylus, using the default parameters supplied with the Touch driver, I managed to get into the Calibrate routine. I calibrated, and then read the parameters from the registry using the SysAdmin ISAPI extension. I wound up with the following information for the 404 board with the 6.4" display:

[HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\TOUCH]
"CalibrationData"="314,319 482,141 485,495 143,498 140,143"

when using the standard defaults in the LCDC driver.

Of course with the new lpd_lh7a40x_lcdc_a40x_50_1_3_1 driver, these values changed (again). The new values are:

[HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\TOUCH]
; -------------------------------------------------------------------
; Calibration data for 6.4" screen (DisplayNumber = 5)
; -------------------------------------------------------------------
"CalibrationData"="504,512 773,227 778,791 231,798 229,228" ; 16-Bpp

Bruce,
Some revisions of the LH7A404-11 boards do not have caps on the touch signals. We are working on a new PCN about this, but it isn't ready for posting. I think you may find that this fixes the jittering on your touchscreen and you'll be able to calibrate much easier. You will find issues on the 6.4" kit and anything larger (10.4", 12.1", .etc).

Here is the info:

Quote:
On some earlier-but-recent part numbers, the boards did not have touch screen filtering capacitors in place. Two of our most recent distribution releases do contain the filtering capacitors (Product Change Notification document is en route). The card engine part numbers that do contain filtering capacitors are: 1001383 and 1001384. Boards without the filtering capacitors are 1001385, 1001048, 1001008, 1001133 and 1001009.

You can visually inspect the boards as well to determine the presence of the filtering caps: If you look at the card engine with the processor on top and the 144 pin SODIMM connector pointed towards you, the touch screen capacitors (or pads) are located on the left edge of the board, to the right of the test point bank from rows 3 to 6 (if row 1 is at the top containing T60 and row 2 is the next one down, etc...).

If your board does not have the filtering capacitors, any noise generated on the touch panel will have no hardware filtering to assist with jitter reduction.

Please advise on the state of your board. If your board does not have filtering capacitors installed, I would recommend you install them (they are 10,000pF ceramic capacitors). Any production systems you order will have these installed.

Thanks,
-Mike

My card engine number is 80000258-0025 rev 202, serial 3404M00045. I see the pads described above - is my board close enough to be safe adding those caps?

Your board is a very early revision. Adding those caps should be fine. They should be C92, C93, C94, and C95.

As a followup the PCN referenced above is here:

http://www.logicpd.com/do...85/1003270_Rev_A.pdf