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TOUCH PANEL ISSUE

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doohm

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Dec 20, 2008, 5:36:02 AM12/20/08

Hi,

We are doing Personal Media Player(PMP) project for advertisement.
I' ve furnished the technical aspect of our project

Processor: AU1250 @700MHZ

SYSTEM BUS FREQUENCY: 232MHZ

TOUCH PANEL: 9",4-WIRE,RESISTIVE TYPE,SHENZHEN TOUCH(WM9712L controlled)

RTOS: WINCE5.0

When we touch the screen,mouse pointer does not move.Sometimes it moves
irrespective of the target place.And we've also noticed that the touch
driver software returns invalid sample co-ordinates corresponding to the
touch place.

The touch screen is working fine when we bring down the processor frequency
to 400MHZ and system bus frequency to 198MHZ.

We've been informed from wolfson technical supports that WM9712L is working
fine at 700MHZ cpu frequency.

I 've given below the responses of the driver software @700MHZ

Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x6c7 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x9cb Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x9cc Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x744 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x0 Y: 0x0
Filtered - SampleFlags: 0x12 X: 0x80b Y: 0x0
Filtered - SampleFlags: 0x3 X: 0x811 Y: 0x811

I'll be thankful if any one replies what is the reason behind the issue.

regards
karthikeyan

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