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tiny2313 pwm dc motor control

tiny2313 pwm timer1 does not work the OCR1A and OCR1B

Hello

 

I want to control 2 DC motors...

 

I set the Timer1 for fast pwm no problem... I run at 4 mhz....

 

what prescaller I need?

and even if I set the OCR1A and OCR1B the speed is constant... any ideea?

 

 

thanks

 

TCCR1A |= (1<<WGM10)|(1<<WGM11)|(1<<COM1B1)|(1<<COM1B0)|(1<<COM1A1)|(1<<COM1A0);

TCCR1B |= (1<<CS11)|(1<<WGM13)|(1<<WGM12); //prescaller