Fast PWM (benutzerdefinierte Obergrenze) auf Atmega168

#include <avr/io.h>

#include <math.h>

//Digital Pin 6 (PD6 / OC0A) PWM

#define NO_OF_SAMPLES 100

#define STEP_X 2.0 * PI / NO_OF_SAMPLES

#define DELTA_TIME2OUT (0.5/NO_OF_SAMPLES) * 1000

int main(void)

{

  double x = 0.0, y;

  long oldTime = millis();

  //Define PD6 as Output

  DDRD |= 1<<DDD6;

  //Configure Timer0

  //Set Prescaler to 1 (internal clock)

  TCCR0B &= ~(1<<CS02 | 1<<CS01);

  TCCR0B |= 1<<CS00;

  //Set Timer Mode to Fast PWM with OCR0A as upper limit

  TCCR0B |= 1<<WGM02;

  TCCR0A |= 1<<WGM01 | 1<<WGM00;

  //Set PWM Mode: Non inverting - Clear OC0A on Compare Match,

  //set OC0A at BOTTOM

  TCCR0A |= 1<<COM0A1;

  TCCR0A &= ~(1<<COM0A0);

  OCR0A = 0x00;

  while(1)

  {

      OCR0A += 50;

      _delay_ms(200);

  }

}