Problem in ADC initialization

Which type of symbolic meanings you are talking about ?

Which type of symbolic meanings you are talking about ?

PCONP   |=   (1<<12);

could be rewritten to:

enum {
    PCONP_PCTIM0 = 1,    ///< Controls power to timer0
    PCONP_PCTIM1 = 2,    ///< Controls power to timer1
    PCONP_PCUART0 = 3,   ///< Controls power to UART0
    PCONP_PCUART1 = 4,   ///< Controls power to UART1
    ...
};
...
PCONP |= 1u << PCONP_PCADC0;

By doing like this, will my code work ?

This is basic textbook stuff:

Instead of writing

PCONP   |=   (1<<12);

Where "(1<<12)" is a pretty meaningless "magic number", you should define a meaningful name; eg,

#define PCONP_TIMER0_ON (1<<12)

so that your code becomes:

PCONP   |=   PCONP_TIMER0_ON

and it becomes much clearer what your code is intended to do!

I still find that really ugly, and would prefer

#define PCONP_TIM0_ON (1u << PCONP_PCADC0)

So that the code becomes:

PCONP   |=   PCONP_TIMER0_ON

It could, of course, also be in an enum, if you prefer.

It won't make any difference to the operation; but it will make the source code far easier to read & understand - and, therefore, to spot errors!

Again this is basic textbook programming practice - nothing specifically to do with the LPC2378, or keil, or...

Ok, I am giving you the sample of the above code again.

void init_ADC(void)
{
uint32_t clk_div;

        PCONP |= (1<<12);
        PINSEL1 |= (1<<16);
        clk_div = SET_ADC0_CLK_AT_kHz(3000);

        AD0CR = (ADC0_CH_1 | PDN | (clk_div << 8));
}

uint16_t read_ADC_data()
{
uint32_t ADC_data;

        AD0CR |= START_ADC0_CONV;
        while(!(AD0DR1 & DONE));
        AD0CR &= STOP_ADC0_CONV;
        ADC_data = (AD0DR1 >> 6)&0x3FF;
         return (uint16_t)ADC_data;
}

Please give me any solution.