帮我把下面的C语言填好！

Generate a square wave on PB0 by toggling its logic level every time that Timer/Counter0 overflows. Use a timer prescaler value of 8.

#include <avr/io.h>

int main(void)
{

while(1)
{

}

return 0;

}

汗，你几班的

#include <avr/io.h>

int main(void)
{

DDRB=0x01;

TCCR0A=00000010;

while(1)
{
while(TIFR0&0x01==0);

TIFR0|=0x01;

PORTB^=1;

}

return 0;

}

没法去填写