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

#define LCD_RS (1 << PB0)
#define LCD_EN (1 << PB1)
#define DIP_SWITCH_MASK 0xFF

bool dipSwitch[8];
bool buttonPressed = false;

void LCD_command(uint8_t cmd) {
    PORTB &= ~LCD_RS;
    PORTD = cmd & 0xF0;
    PORTB |= LCD_EN;
    _delay_us(1);
    PORTB &= ~LCD_EN;

    _delay_us(100);

    PORTD = (cmd << 4) & 0xF0;
    PORTB |= LCD_EN;
    _delay_us(1);
    PORTB &= ~LCD_EN;

    _delay_us(100);
}

void LCD_init() {
    DDRB |= (LCD_RS | LCD_EN);
    DDRD = 0xFF;

    _delay_ms(15);
    LCD_command(0x02);
    LCD_command(0x28);
    LCD_command(0x0C);
    LCD_command(0x06);
    LCD_command(0x01);
}

void readDipSwitch() {
    for (int i = 0; i < 8; ++i) {
        dipSwitch[i] = (PIND & (1 << i));
    }
}

int main(void) {
    DDRD = 0x00; // Set DIP switch pins as input
    PORTD = 0xFF; // Enable internal pull-up resistors

    DDRB &= ~(1 << PB2); // Set button pin as input
    PORTB |= (1 << PB2); // Enable internal pull-up resistor for the button

    LCD_init();

    while (1) {
        readDipSwitch();
        buttonPressed = !(PINB & (1 << PB2));

        if (buttonPressed && (dipSwitch[0] || dipSwitch[1] || dipSwitch[2] || dipSwitch[3] ||
                              dipSwitch[4] || dipSwitch[5] || dipSwitch[6] || dipSwitch[7])) {
            LCD_command(0x01); // Clear display
            LCD_command(0x80); // Set cursor to line 1
            LCD_command('H');
            LCD_command('l');
            LCD_command('a');
            LCD_command('s');
            LCD_command('o');
            LCD_command('v');
            LCD_command('a');
            LCD_command('n');
            LCD_command('i');
            LCD_command('e');
            LCD_command(' ');
            LCD_command('p');
            LCD_command('r');
            LCD_command('e');
            LCD_command('s');
            LCD_command('l');
            LCD_command('o');
        }
    }
    return 0;
}