// 0% , 25%, 50%, 75%, 100%;
// 1000 hz timer feq
// N = FOSC / (1000 * 256 ) = 62.5, el mas cerca es 64 
// N en el ADC es  7
// ph6 ocr2b, pk7 adc15
#include<avr/io.h>
#include<avr/interrupt.h>

uint8_t input_signal = 0;

timer2_init(){
  TCNT2 = 0;
  TCCR2A = (1<<COM2B1) | (1<<COM2B0) | (1<<WGM21) | (1<<WGM20);
  TCCR2B = (1<<CS22);
  OCR2B = 255; //empezar apagado

}

adc_init() {
  ADMUX = (1<<REFS0) | (1<<ADLAR) | (1<<MUX2) | (1<<MUX1) | (1<<MUX0);
  ADCSRA = (1<<ADEN) | (1<<ADSC) | (1<<ADATE) | (1<<ADIE) | (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0);
  ADCSRB = (1<<MUX5);
  DIDR2 = (1<<ADC15D);
  sei();
}
 
ISR (ADC_vect) {
  input_signal = ADCH;
  PORTF = input_signal;
  ADCSRA |= (1<<ADSC);
}

void set_workcycle( uint8_t value) {
  if (value == 0) {
    TCCR2A &= ~(1<<COM2B0);
    OCR2B = 0;
  }
  else {
    TCCR2A |= (1<<COM2B0);
    if (value < 256/4) {
      OCR2B = 256/4;
    }
    else if (value < 256/2) {
      OCR2B = 256/2;
    } 
    else if (value < 3*256/4) {
      OCR2B = 3*256/4;
    }
    else if (value < 256) {
      OCR2B = 0;
    }
  }
}

void main () {
  DDRH = (1<<PH6);
  adc_init();
  timer2_init();
  DDRF = 0xFF;
  while(1) {
    set_workcycle(input_signal);
  }
}