Atmega32 chip programming with ADC

main.c

/*
 * LDRCode.c
 *
 * Created: 7/30/2018 09:47:05 AM
 * Author : Arnob
 */ 
#define F_CPU 8000000UL
#include <avr/io.h>
#include <util/delay.h>

void ADC_Init()
{
	DDRA=0x0;				/* Make ADC port as input */
	ADCSRA = 0x87;			/* Enable ADC, fr/128  */
	ADMUX = 0x40;			/* Vref: Avcc, ADC channel: 0 */
	
}

int ADC_Read(char channel)
{
	int Ain,AinLow;
	
	ADMUX=ADMUX|(channel & 0x0f);	/* Set input channel to read */

	ADCSRA |= (1<<ADSC);			/* Start conversion */
	while((ADCSRA&(1<<ADIF))==0);	/* Monitor end of conversion interrupt */
	
	_delay_us(10);
	AinLow = (int)ADCL;				/* Read lower byte*/
	Ain = (int)ADCH*256;			/* Read higher 2 bits and 
										Multiply with weight */
	Ain = Ain + AinLow;				
	return(Ain);					/* Return digital value*/
}

int main(void)
{
	ADC_Init();
	int value;
	DDRD = 0xFF;
	
    while(1)
    {
	   value=ADC_Read(0);

	    if (value > 900){
		    PORTD = 0xFF;
		    _delay_ms(220);
		    _delay_ms(220);
		    }else{
		    PORTD = 0x00;
		    _delay_ms(220);
		    _delay_ms(220);
	    }
    }
}