[AVR] Problem in DGS05NF STD servo motor interfacing with ATmega32

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#include<avr/io.h>
#include<util/delay.h>
#include<stdio.h>
#include<avr/interrupt.h>
 
int main(void);
void init_timer0(void);
 
int main(void)
{
    DDRD &= (~((1 << DDD0)|(1 << DDD1)));   // Pins as input (push buttun for survo directon) 
    DDRD |= (1 << DDD4) | (1 << DDD5);   //PWM Pins as Output 
        
    init_timer1(); // Initialize timer1
    
    
    while(1)
    {
 
        if(PIND & ((1 << PORTD0))) // If switch_1 pressed
        {
            OCR1A = OCR1A+10 ; //increase duty cycle
            _delay_ms(10);
        }
 
        if(PIND & ((1 << PORTD1))) // If switch_2 pressed
        {
            OCR1A = OCR1A-10 ; //decease duty cycle
            _delay_ms(10);
        }
 
    }//while(1) ends here
 
    
    return 0;
}
 
void init_timer1(void)
{
    //Configure TIMER1
   TCCR1A|=(1<<COM1A1)|(1<<COM1B1)|(1<<WGM11);        // NON Inverted PWM
   TCCR1B|=(1<<WGM13)|(1<<WGM12)|(1<<CS11)|(1<<CS10); //PRESCALER=64 MODE 14(FAST PWM)
 
   ICR1=4999;  //fPWM=50Hz (Period = 20ms Standard).
}