POT value using ATmega328P

/*
 * SingleADCinputATmega328p.cpp
 *
 * Created: 17-10-2024 10:34:39
 * Author : subrs
 */ 
#define F_CPU 1000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include "util/delay.h"
#include <stdio.h>

#define TOGGLE_PIN PD2												// Pin to toggle on ADC interrupt

volatile uint16_t pot = 0;											// Variable to store the ADC result

// LDC interfacing code
#define RS PD0							
#define EN PD1							
#define LCD_PORT PORTB					

char buffer[16];						

void LCD_Command(unsigned char cmnd);
void LCD_Char(unsigned char data);
void LCD_Init(void);
void LCD_String(char *str);
void LCD_Clear(void);
void LCD_SetCursor(unsigned char row, unsigned char col);

void timer0_init(void) 
{
	// Set Timer 0 to CTC mode
	TCCR0A |= (1 << WGM01);											// CTC mode
	TCCR0B |= (1 << CS01) | (1 << CS00);							// Prescaler 6	
	OCR0A = 14;														// Compare match value for 1ms interval (16MHz clock, 64 prescaler)
	TIMSK0 |= (1 << OCIE0A);										// Enable Timer 0 Compare Match A Interrupt
}

void adc_init(void) 
{	
	ADMUX |= (1 << REFS0);											// Set ADC reference to AVcc	
	ADMUX |= (1 << MUX0);											// Select ADC1 (PC1) input channel	
	ADCSRA |= (1 << ADEN) | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);		// Enable ADC and set prescaler to 128	
	ADCSRA |= (1 << ADIE);											// Enable ADC Interrupt
}

ISR(TIMER0_COMPA_vect) 
{
	ADCSRA |= (1 << ADSC);											// Start ADC conversion on compare match
}

ISR(ADC_vect) 
{	
	pot = ADC;														// Store the 10-bit ADC result	
	PORTD ^= (1 << TOGGLE_PIN);										// Toggle the pin to verify sampling rate
}

int main(void) 
{
	DDRD |= (1 << TOGGLE_PIN);

	timer0_init();
	adc_init();
	LCD_Init();
	sei();

	while (1) 
	{
		LCD_Clear();
		sprintf(buffer, "Pot: %u", pot);
		LCD_SetCursor(0, 0);
		LCD_String(buffer);
		_delay_ms(500);
	}
}

// Send a command to the LCD
void LCD_Command(unsigned char cmnd)
{
	LCD_PORT = cmnd;                              // Send command to data bus
	PORTD &= ~(1 << RS);                          // RS = 0 for command
	PORTD |= (1 << EN);                           // Enable pulse
	_delay_us(1);
	PORTD &= ~(1 << EN);
	_delay_ms(2);
}

// Send a character to the LCD
void LCD_Char(unsigned char data)
{
	LCD_PORT = data;                              // Send data to data bus
	PORTD |= (1 << RS);                           // RS = 1 for data
	PORTD |= (1 << EN);                           // Enable pulse
	_delay_us(1);
	PORTD &= ~(1 << EN);
	_delay_ms(2);
}

// Initialize the LCD
void LCD_Init(void)
{
	DDRB = 0xFF;                                  // Configure data port for LCD (all output)
	DDRD |= (1 << RS) | (1 << EN);                // Configure RS and EN pins as output

	_delay_ms(20);                                // LCD power on delay
	LCD_Command(0x38);                            // 8-bit mode, 2-line, 5x7 font
	LCD_Command(0x0C);                            // Display ON, Cursor OFF
	LCD_Command(0x06);                            // Auto-increment cursor
	LCD_Command(0x01);                            // Clear display
	_delay_ms(2);
}

// Send a string to the LCD
void LCD_String(char *str)
{
	while (*str)
	{
		LCD_Char(*str++);
	}
}

// Clear the LCD display
void LCD_Clear(void)
{
	LCD_Command(0x01);                            // Clear display command
	_delay_ms(2);
}

// Set cursor to specific row and column
void LCD_SetCursor(unsigned char row, unsigned char col)
{
	unsigned char pos[] = {0x80, 0xC0};           // DDRAM addresses for row 0 and row 1
	LCD_Command(pos[row] + col);
}