ProjektAttiny25.c


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/*

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 * ProjektAttiny25.c

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 *

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 * Created: 12.05.2014 15:38:55

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 *  Author: Test1

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 */ 

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#include <avr/io.h>

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#include <avr/interrupt.h>

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int maxpwm = 100;

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int dutypwm =80;

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void  Timer1(){

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  TCCR1 |=(1<<CTC1)|(1<<PWM1A)|(1<<COM1A1)|(1<<CS12);

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  OCR1C = maxpwm;

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  OCR1A = dutypwm;

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  TIMSK |=(1<<OCR1A);

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  }

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ISR (TIMER1_COMPA_vect)

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{

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  int i_unten=0;

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  int i_oben= 1;

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  if(i_oben==1)

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  {

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    maxpwm=maxpwm -10;

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    OCR1C=maxpwm;

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    if(maxpwm<=100)

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    {

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      i_unten=0;

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      i_oben=1;

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    }

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    else

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    i_oben=1;

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    i_unten=0;

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  }

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  if(i_unten==1)

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  {

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    maxpwm+=10;

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    OCR1C=maxpwm;

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    if(maxpwm>=190)

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    {

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      i_oben=1;

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      i_unten=0;

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    }

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    else

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    i_oben =0,

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    i_unten=1;

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  }

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  PORTB^=(1<<PB1);

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  TCCR1 &=~(1<<CTC1);

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};

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int main(void)

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{

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  DDRB=0x07;

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PORTB|=(1<<PB3);

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  Timer1();

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    while(1)

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    {

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        if(PORTB|=(1<<PB3))

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    {

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      sei();

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    }

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  else

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  cli();

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  }

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}