/* 
 * File:   main.c
 * Author: Sebastian H. Gabrielli
 *
 * Created on March 6, 2024, 12:34 PM
 */
#include "header.h"
#define F_CPU 4000000UL
#define RTC_PERIOD (511)
#define DELAY_TIME 1000
#define USART3_BAUD_RATE(BAUD_RATE) ((float) (64*F_CPU /(16*(float)BAUD_RATE) )+0.5)
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>

static FILE USART_stream = FDEV_SETUP_STREAM(USART3_printChar, NULL, _FDEV_SETUP_WRITE);

void sensor_init(void) {
    /* Disable digital input buffer */

}

void USART3_init(void) {
    PORTB.DIRCLR &= ~PIN1_bm;
    PORTB.DIRSET |= PIN0_bm;
    PORTB.DIRCLR = PIN2_bm;
    PORTB.PIN2CTRL |= PORT_PULLUPEN_bm;
    USART3.CTRLB |= USART_RXEN_bm | USART_TXEN_bm; /* Enable both TX and
	RX */
    USART3.BAUD = USART3_BAUD_RATE(9600); /* Setting the baudrate */
}

void ADC0_init(void) {
    PORTD.PIN6CTRL &= ~PORT_ISC_gm;
    PORTD.PIN6CTRL |= PORT_ISC_INPUT_DISABLE_gc;
    PORTD.PIN6CTRL &= PORT_PULLUPEN_bm;
       
    ADC0.CTRLC = ADC_PRESC_DIV4_gc;
    VREF.ADC0REF = VREF_REFSEL_VDD_gc; /* Internal reference */
    ADC0.CTRLA = ADC_ENABLE_bm /* ADC Enable: enabled */
            | ADC_RESSEL_10BIT_gc; /* 10-bit mode */
    /* Select ADC channel */
    ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
}

void USART3_sendChar(char c) {
    while (!(USART3.STATUS & USART_DREIF_bm)) {
        ;
    }
    USART3.TXDATAL = c;
}

void USART3_sendString(char *str) {
    for (size_t i = 0; i < strlen(str); i++) {
        USART3_sendChar(str[i]);
    }
}

static int USART3_printChar(char c, FILE *stream) {
    USART3_sendChar(c);
    return 0;
}

uint16_t ADC0_read(void) {
    /* Start ADC conversion */
    ADC0.COMMAND = ADC_STCONV_bm;
    /* Wait until ADC conversion done */
    while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)) {
        ;
    }
    /* Clear the interrupt flag by writing 1: */
    ADC0.INTFLAGS = ADC_RESRDY_bm;
    return ADC0.RES;
}

bool ADC0_conversationDone(void) {
    if (ADC0.INTFLAGS && ADC_RESRDY_bm) {
        return true;
    } else {
        return false;
    }

}

int main(void) {
    sensor_init();
    ADC0_init();
    USART3_init();
    stdout = &USART_stream;

    while (1) {
        //printf("loop\n");
        if (ADC0_conversationDone()) {
            adcVal = ADC0_read();
            VREF.ADC0REF = VREF_REFSEL_VDD_gc;
            printf("The values: \n");
            printf("%u , %u",VREF_REFSEL_VDD_gc , adcVal);
        }
    }
}