/*
 * Analog Voltmeter
 *
 * Created: 12/1/2023 1:29:09 PM
 * Author : VGU1
 */ 
#include <stdio.h>
#define F_CPU 8000000UL
#include <avr/io.h>						/* Include AVR std. library file */
#include <util/delay.h>					/* Include inbuilt defined Delay header file */

#define analog_port PORTA
#define analog_ddr DDRA
float volt;

void ADC_Init(){
	PORTA = 0x00;          /* Make ADC port as input */
	ADCSRA = 0x87;          /* Enable ADC, with freq/128  */
	ADMUX |= (1<<REFS0);           /* Vref: Avcc, ADC channel: 0 */
}

int ADC_Read(char channel)
{
	ADMUX = 0x40 | (channel & 0x07);   /* set input channel to read */
	ADCSRA |= (1<<ADSC);               /* Start ADC conversion */
	while (!(ADCSRA & (1<<ADIF)));     /* Wait until end of conversion by polling ADC interrupt flag */
	ADCSRA |= (1<<ADIF);               /* Clear interrupt flag */
  	_delay_ms(1);                      /* Wait a little bit */
	return ADCW;                       /* Return ADC word */
}


int main()
{
	char Voltage[10];
	ADC_Init();                 /* initialize ADC*/
	int i;
	lcd_initialization();							/* Initialization of LCD*/
	lcd_display_string("DC Voltage");
	lcd_sending_command(0xc0);                  /* Go to 2nd line*/
  while	(1) {
		volt = (ADC_Read(3)*0.0322);
		volt = (volt/10.00);
		lcd_sending_command(0xc0);
        lcd_sending_command(0x0C);
		lcd_string_float(volt,2,1 );/* send string data for printing */
		lcd_display_string(" V"); 
        _delay_ms(10); 
	}

}