LPC2148 and Sharp 2y0a02 Problem

Hi there,

we're new to microprocessor programming and right now we are trying to 
get an olimex LPC2148 to work with a Sharp Optical Sensor 2y0a02.
But it seems we are too dumb to get the A/D changer to work properly.

We already tested the sensor and it works correctly. We plugged the 
sensor to the p0.30 / AD03 pin
See the code, laugh at us and please tell us where our mind-barrier lies 
:)

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#include<targets/lpc2000.h>

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#include<stdio.h>

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static int erg;

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int main(void) {

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PINSEL1&=~(1<<29);

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PINSEL1|=(1<<28);

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AD0CR|=(1<<3); // Kanal 3

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AD0CR|=(1<<9);

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AD0CR|=(1<<10);

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AD0CR|=(1<<16);

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AD0CR|=(1<<21);

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while(1){

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   if(AD0DR3&(1<<31)){

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    erg=(short)(AD0DR3>>6);

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    debug_printf("%i\n",erg);

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  }

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}

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return(0);

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}