lpc2148 analog to digital conversion help ?

Code C - [expand]
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#include <LPC213X.H>
#include <stdio.h>
#include "lcd.h"
 
 
        
//VBC CLOCK 12MHZ
void delay();
void adc_data();
void adc_ini();
 
 
unsigned long val,adc_val;
unsigned char buffer [21];  // Set size to LCD width plus one null
 
 
int main(void)
{
        
 
            while(1)
                
            {
                    adc_ini(); //initializing adc
                    adc_data();//extracting data
    
            
                /*code for lcd print*/
                    PINSEL0=0X00000000; // gpio pin 0.0 to 0.15
                    PINSEL2=0X00000000; // gpio pin 1.16 to 1.31
                    IODIR0=0X00000007; //p0.0 rs p0.1 r/w p0.2 e    
                    IODIR1=0X00ff0000; //p1.16 to p1.24 output
                    lcdinit();
                    sprintf (buffer, "ADC Value: %x", adc_val);
                    lcdputs(buffer);
                        
 
    }
}
 
void adc_ini(void)
{
        
    
        PINSEL1 = 0X01000000; //pin 13 p0.28 adc 0 channel 1
        PCONP |=  0X00001000;   //select adc 0 bit 12
        AD0CR &=  0X00000000;
        AD0CR |=  0X00200202; // WITH PCLK 12/(2+1)=4MHZ ADC0 CHANNEL 1 PIN 13
        AD0INTEN &= 0x00000000; //Completion of a conversion on ADC channel 0 will not generate an interrupt.
 
 
}
void adc_data(void)
{
                    AD0CR  |= 0x01000000;                   /* Start A/D Conversion               */
                    while((AD0DR & 0x80000000)==0); //until bit 31 is high (DONE)
                    val = AD0DR; //read a/d data register
                    adc_val = ((val >> 6) & 0x3FF);    // Extract AD result
}