PWM_AT90CAN128.c

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

unsigned long int i = 0;
unsigned long int j = 0;

double x = 0.5;           



void delay_us2(long int us) {
	long int i;
	us /= 10;
	for(i=0; i < us; i++) {
		_delay_us(10);
	}
}

void impuls(long int us) {
	PORTF=0xff;
	delay_us2(us);	
	PORTF=0;
	delay_us2(18500-us);
}
 
int main(void) {

     	DDRF = 0xff; 

	long int us;

	for(j = 1; j < 300; j++) {  
		PORTF=0xff;
		_delay_us(1000);	
		PORTF=0x00;
		_delay_us(19000);
	}

	for(us = 1000; us < 1300; us++) {    

	if(us > 2000){
	us = 2000;
	}
		impuls(us);
	}

	for(; us >= 400; us--) {
	if(us < 900){
	us = 900;
	}
		impuls(us);
	}

	while(1) {
		impuls(900);
	}
	
 	return 0;

}