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

void ADC_init(void) {
    // Enable ADC and set the reference voltage to AVDD
    ADC1.CTRLA = ADC_ENABLE_bm;      // Enable ADC
    ADC1.CTRLC |= ADC_REFSEL_VDDREF_gc; // Reference voltage selection
    ADC1.CTRLC |= ADC_PRESC_DIV256_gc; // Prescaler
}

uint16_t ADC_read(uint8_t channel) {
    // Select the ADC channel
    ADC1.MUXPOS = channel;
    
    // Start the conversion
    ADC1.COMMAND |= ADC_STCONV_bm;
    
    // Wait for conversion to complete
    while (!(ADC1.INTFLAGS & ADC_RESRDY_bm));
    
    // Read the result
    return ADC1.RES; // Return the 12-bit result
}

int main(void){
    PORTB.DIRSET = 1 << 1;
    PORTB.DIRSET = 1 << 2;
    PORTB.DIRSET = 1 << 3;

    PORTA.PIN4CTRL |= PORT_PULLUPEN_bm;
    PORTC.PIN1CTRL |= PORT_PULLUPEN_bm;
    ADC_init();

    while(1){
        static uint16_t cooldown = 0;
        uint8_t suck = !(PORTA.IN & (1<<4));
        uint8_t mode = !(PORTC.IN & (1<<1));
        if(suck ^ mode){
            static uint8_t timer = 0;
            static uint16_t duty = 0;

            if(timer == 0)
                duty = (ADC_read(6)/4);

            PORTB.OUTSET = 1 << 1;
            PORTB.OUTCLR = 1 << 3;
            if(++timer > duty){
                PORTB.OUTSET = 1 << 2;
            }
            else{
                PORTB.OUTCLR = 1 << 2;
            }
            cooldown=10000;
        }
        else {
            PORTB.OUTCLR = 1 << 1;
            PORTB.OUTCLR = 1 << 2;
            if(cooldown > 0){
                cooldown--;
                PORTB.OUTSET = 1 << 3;
            }
            else
                PORTB.OUTCLR = 1 << 3;
        }
    }
}