blinking led continuously with 1 second in C language(atmega328p) - c

Question

I am using AVR Studio5 to program the arduino uno rev3 with atmel atmega328p.Now , I am trying blink a led continuously within 1 second .
The code is :
PORTD = 0b10001010;
TCNT1H = 0xBB;
TCNT1L = 0xBB;
TCCR1A = 0;
TCCR1B = 5; // prescaler is 1024
while((TIFR1 & (1<<TOV1)) == 0)
{
temp = TCNT1H;
while ((TCNT1H - temp) >= 11);
PORTD ^= 1<<7; // blinking as expected
}
TIFR1 = 1<<TOV1;
TCCR1A = 0;
TCCR1B = 0;
The above code shows that I use a timer1 lasting for 1 second in which I attempt to blink the PORTD.7 led for each 0.032768s.
But , now , the problem is that the timer works for delaying 1 second but the led keep lighting without blinking . Please help .
( P.S the circuit works fine )
Complement :
If I use the following code , it shows the led blinking.
for ( a = 0;a<2;a++)
{
PORTD = 0b00001010;
TCNT1H = 0xEE;
TCNT1L = 0xEE;
TCCR1A = 0;
TCCR1B = 5; // prescaler is 1024
while((TIFR1 & (1<<TOV1)) == 0);
TIFR1 = 1<<TOV1;
TCCR1A = 0;
TCCR1B = 0;
PORTD = 0b10001010;
TCNT1H = 0xEE;
TCNT1L = 0xEE;
TCCR1A = 0;
TCCR1B = 5; // prescaler is 1024
while((TIFR1 & (1<<TOV1)) == 0);
TIFR1 = 1<<TOV1;
TCCR1A = 0;
TCCR1B = 0;
}
But , for the simplicity , I prefer the most top method if working .

Answer 1

while ((TCNT1H - temp) >= 10)
{
PORTD ^= 1<<7; // blinking as expected
}
You are blinking too fast, so fast that actually what are you are seeing is a LED with half the luminosity. You need to add some delay between two invocations of PORTD ^= 1<<7.

Answer 2

This is something that should be done with an interrupt.
void TMR_init(void)
{
DDRD|=_BV(PD7); //bit 7 of port D to output
TCNT1=0; //reset the timer counter
OCR1AL=0xC6; //depends on your osc. This values are for 12MHz
OCR1AH=0x2D; //with 12 000 000Hz / 1024 it takes 11718 ticks for 1 sec->0x2D C6
TIMSK1|=_BV(OCIE1A); //enable interrupt on output compare A (when timer value == value in the OCR1AL/H-registers)
TCCR1A=0; //normal operation
TCCR1B=_BV(CS12) | _BV(CS10); //prescaler 1024 and starts the timer
sei(); //enable interrupts
}
//isr
SIGNAL(TIMER1_COMPA_vect)
{
PORTD^=_BV(PD7); //toggle
}
This code should work but is untested. Don't forget to include avr/interrupt.h. Some macros may differ due to version differences of the compiler.