Timer/counter 2

hi every one,

i trying use timer/counter 2, output (oc2a) following code :

    ddrd |= (1<<pb3);

    // timer 2 activation
    prr &=~(1<<prtim2);

    // timer/counter2 clocked i/o clock
    assr &=~(1<<as2);
   
    //set initial timer value
    tcnt2=0;
   
    //place top timer value output compare register a
    ocr2a=255;

    // set fast pwm mode
    // , make toggle pb3/oc2a pin on compare match
    tccr2a |=(1<<com2a1);
    tccr2a |=(1<<com2a0);
   
    tccr2b |=(1<<wgm22);
    tccr2a |=(1<<wgm21)|(1<<wgm20);

     // set prescaller 1024 , start timer
    tccr2b |=(1<<cs22);
    tccr2b |=(1<<cs21);
    tccr2b |=(1<<cs20);

    // ocie2a: timer/counter2 output compare match interrupt enable
    timsk2 |=(1<<ocie2a);

with no success.

the oscilloscope on pin pb3 (oc2a) (arduino pin 11) shows no signal @ all.

what wrong or missing code ?

thank help.

ddrd?

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