tiny10: Fade PB0 and PB1 up and down using PWM

gistfile1.txt

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


int main(void)
{
    int i;
    
    // PB0 and PB1 outputs
    DDRB = (1<<PB0) | (1<<PB1);
    // Timer0 in mode 14, fast PWM with ICR0 as top.
    // Enable OC0A and OC0B, lower mode bits
    TCCR0A = (1<<COM0A1) | (1<<COM0B1) | (1<<WGM01);
    // Set top to 1000
    ICR0 = 1000;
    // Start timer with prescaler 1:8 and set upper mode bits
    TCCR0B = (1<<CS01)  | (1<<WGM03) | (1<<WGM02);

    while(1)
    {
	for (i = 0; i <= 1000; i++)
	{
	    OCR0A = i;
	    OCR0B = 1000-i;
	    _delay_ms(1);
	}
	for (i = 1000; i >= 0; i--)
	{
	    OCR0A = i;
	    OCR0B = 1000-i;
	    _delay_ms(1);
	}
    }
}