How to use output PWM in AVR

Question

I have this code to blink an array (8-led) of led one after one:

#include <avr/io.h>
#include <avr/delay.h>

#define dela 500

int main (void)
{
    DDRC = 0xFF;
    for(int i=0; ; i++,i%=8)
    {
        PORTC |=(1<<i);
        delay_ms(dela);
        PORTC &= ~(1 << i);
        delay_ms(dela);
    }
}

I want to light up those led partially, like dimmed version of this, something like PWM

Now my question is how can I do that, how can I write analog output ?

Micro-controller : ATmega8A - PDIP

Answer 1

Modulate the LED "on" time.

Something like this.

for(int i=0; ; i++,i%=8)
{
    for(int k=0; k<26; k++)
    {
        PORTC |=(1<<i);
        delay_ms(10);
        PORTC &= ~(1 << i);
        delay_ms(10);
    }
    delay_ms(dela);
}