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

[FAHIM REAZA]

Dear,
I have a problem to interfacing DGS05NF STD servo motor with ATmega32. I want to move "Robotic Claw - MKII" using "DGS05NF STD servo motor" with ATmega32. I have complete a program for this purpose. But there is a problem. My program execute in PROTEUS correctly. In practical , the motor rotate in 0 to 180 degree , only one when i power in. Here i used while loop, but it don't repeat the action. Actually it does not follow my instruction.

Anybody can help me ??? Please.................

Here is the link of the motor and claw.......
Servo : https://www.sparkfun.com/products/10333
Claw : https://www.sparkfun.com/products/11524

Here is my code :

In my code, i want , while i pressed a switch, then the servo rotate a direction (until i pressed the switch). Similarly while i pressed another switch, the the servo rotate opposite direction.

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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).
}

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