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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)
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
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.
We 've tested the touch signal @400MHZ cpu frequency as well as 700MHZ cpu frequency . While testing 700MHZ , we 've noticed that overlapping of the pulses.Which means that the high amplitude pulse overlapping with the variable one whose amplitude varies depends on the touch place.
The above thing does not happen while touch is working @400MHZ cpu frequency .
I 'll be thankful if anybody replies what is the reason behind the issue.