// Include the necessary libraries
#include <avr/io.h>
#include <avr/interrupt.h>

// Define constants
#define mask 0x00;
unsigned char switchState,maskedSw;
long dutyCycle = 0;

int main(void) {
  // Initialize serial communication
  Serial.begin(9600);

  DDRB |= (1 << PORTB7);                                  // enable output PB7 PWM pin                
  PORTB = 0x00;

  DDRC = 0x00;                                           // set port C input
  PORTC = 0xFF;                                          // enable pull-up resistor

  // Configure Timer/Counter 0 (TC0) for FAST PWM
  cli();
  TCCR0A = (1 << COM0A1 ) | (1 << WGM01) | (1 << WGM00);                   // Set Fasw PWM
  TCCR0B = 0x01;                                          // prescaler to 8
  TCNT0 = 0;                                              // Initialize counter value to 0
  
  sei();
  
  OCR0A = 1;                                                  // Enable global interrupts

// Your setup code here (if any)

while(1) {
  // Your main code here
  switchState = PINC;
  maskedSw = switchState ^ mask;

  switch(maskedSw)
        {	
            case 0x01:
                dutyCycle = 10;
            break;

            case 0x02:
                dutyCycle = 20;
            break;

            case 0x04:
            dutyCycle = 40;
            break;

            case 0x08:
            dutyCycle = 50;
            break;

            case 0x10:
            dutyCycle = 60;
            break;

            case 0x20:
            dutyCycle = 70;
            break;

            case 0x40:
            dutyCycle = 80;
            break;

            case 0x80:
            dutyCycle = 100;
            break;

            default:
            dutyCycle = 1;
            break;
        }

        OCR0A = ((dutyCycle / 100.0) * 255);

        Serial.println(OCR0A);
        Serial.println(dutyCycle);
        Serial.println(maskedSw);

}
}