#define F_CPU 8000000UL        /* Define CPU Frequency e.g. here 8MHz */
#include <avr/io.h>            /* Include AVR std. library file */
#include <util/delay.h>        /* Include inbuilt defined Delay header file */

// LCD bağlantı pinleri
#define LCD_Data_Dir DDRB      /* Define LCD data port direction */
#define LCD_Command_Dir DDRC   /* Define LCD command port direction register */
#define LCD_Data_Port PORTB    /* Define LCD data port */
#define LCD_Command_Port PORTC /* Define LCD data port */
#define RS PC0                 /* Define Register Select (data/command reg.)pin */
#define RW PC1                 /* Define Read/Write signal pin */
#define EN PC2                 /* Define Enable signal pin */

#define DHT22_PIN PD6

// Load cell kalibrasyon faktörleri
float calibration_factor1 = 1.0; // Load cell 1 için kalibrasyon faktörü
float calibration_factor2 = 1.0; // Load cell 2 için kalibrasyon faktörü

void dht22_request() {
  DDRD |= (1 << DHT22_PIN); // Çıkış modu
  PORTD &= ~(1 << DHT22_PIN); // Düşük sinyal gönder
  _delay_ms(20); // 20ms bekle
  PORTD |= (1 << DHT22_PIN); // Yüksek sinyal gönder
  _delay_us(40); // 40us bekle
  DDRD &= ~(1 << DHT22_PIN); // Giriş modu
}

uint8_t dht22_response() {
  uint8_t response = 0;
  DDRD &= ~(1 << DHT22_PIN); // Giriş modu
  _delay_us(40);

  if (!(PIND & (1 << DHT22_PIN))) {
    _delay_us(80);
    if ((PIND & (1 << DHT22_PIN))) {
      response = 1;
    }
    _delay_us(80);
  }
  return response;
}

uint8_t dht22_receive_data() {
  uint8_t data = 0;
  for (int i = 0; i < 8; i++) {
    while (!(PIND & (1 << DHT22_PIN))); // Yüksek seviye bekleme
    _delay_us(30);
    if (PIND & (1 << DHT22_PIN)) {
      data = (data << 1) | 1; // 1 oku
    } else {
      data = (data << 1); // 0 oku
    }
    while (PIND & (1 << DHT22_PIN)); // Yüksek seviye bekleme
  }
  return data;
}

uint8_t read_dht22_humidity(uint8_t pin) {
  uint8_t humidity_high, humidity_low, checksum;

  dht22_request();

  if (dht22_response()) {
    humidity_high = dht22_receive_data();
    humidity_low = dht22_receive_data();
    checksum = dht22_receive_data();

    // Checksum kontrolü
    if ((humidity_high + humidity_low) == checksum) {
      return humidity_high;
    } else {
      return 0; // Hata durumunda 0 dön
    }
  } else {
    return 0; // Sensör yanıt vermediğinde 0 dön
  }
}

uint8_t read_dht22_temperature(uint8_t pin) {
  uint8_t temp_high, temp_low, checksum;

  dht22_request();

  if (dht22_response()) {
    temp_high = dht22_receive_data();
    temp_low = dht22_receive_data();
    checksum = dht22_receive_data();

    // Checksum kontrolü
    if ((temp_high + temp_low) == checksum) {
      return temp_high;
    } else {
      return 0; // Hata durumunda 0 dön
    }
  } else {
    return 0; // Sensör yanıt vermediğinde 0 dön
  }
}

void LCD_Command(unsigned char cmnd) {
  LCD_Data_Port = cmnd;
  LCD_Command_Port &= ~(1 << RS); /* RS=0 command reg. */
  LCD_Command_Port &= ~(1 << RW); /* RW=0 Write operation */
  LCD_Command_Port |= (1 << EN);  /* Enable pulse */
  _delay_us(1);
  LCD_Command_Port &= ~(1 << EN);
  _delay_ms(3);
}

void LCD_Char(unsigned char char_data) {
  LCD_Data_Port = char_data;
  LCD_Command_Port |= (1 << RS);  /* RS=1 Data reg. */
  LCD_Command_Port &= ~(1 << RW); /* RW=0 write operation */
  LCD_Command_Port |= (1 << EN);  /* Enable Pulse */
  _delay_us(1);
  LCD_Command_Port &= ~(1 << EN);
  _delay_ms(1);
}

void LCD_Init(void) {
  LCD_Command_Dir = 0xFF; /* Make LCD command port direction as o/p */
  LCD_Data_Dir = 0xFF;    /* Make LCD data port direction as o/p */
  _delay_ms(20);          /* LCD Power ON delay always >15ms */
  LCD_Command(0x38);      /* Initialization of 16X2 LCD in 8bit mode */
  LCD_Command(0x0C);      /* Display ON Cursor OFF */
  LCD_Command(0x06);      /* Auto Increment cursor */
  LCD_Command(0x01);      /* Clear display */
  LCD_Command(0x80);      /* Cursor at home position */
}

void LCD_String(char *str) {
  int i;
  for (i = 0; str[i] != 0; i++) { /* Send each char of string till the NULL */
    LCD_Char(str[i]);
  }
}

void LCD_String_xy(char row, char pos, char *str) {
  if (row == 0 && pos < 16) {
    LCD_Command((pos & 0x0F) | 0x80);
  } else if (row == 1 && pos < 16) {
    LCD_Command((pos & 0x0F) | 0xC0);
  }
  LCD_String(str);
}

void LCD_Clear() {
  LCD_Command(0x01);
  LCD_Command(0x80);
}



/*
  int main() {
  LCD_Init();

  while (1) {
    // DHT22'den sıcaklık ve nem değerlerini okuma
    int h = read_dht22_humidity(6);
    int t = read_dht22_temperature(6);

    // Load cell'den ağırlık değerlerini okuma
    //int water_weight = hx711_get_units(2, 3, calibration_factor1);
    //int food_weight = hx711_get_units(4, 5, calibration_factor2);

    // Verileri LCD'de gösterme
    char buffer[16];

    // Sıcaklık ve nem değerlerini LCD'de gösterme
    LCD_Clear();
    snprintf(buffer, sizeof(buffer), "Nem: %d %%", h);
    LCD_String_xy(0, 0, buffer);
    snprintf(buffer, sizeof(buffer), "Sicaklik: %d C", t);
    LCD_String_xy(1, 0, buffer);

    _delay_ms(2000);
    LCD_Clear();

    // Load cell'den su ve mama miktarlarını LCD'de gösterme
    //snprintf(buffer, sizeof(buffer), "Su: %d g", water_weight);
    //LCD_String_xy(0, 0, buffer);
    //snprintf(buffer, sizeof(buffer), "Mama: %d g", food_weight);
    //LCD_String_xy(1, 0, buffer);

    // _delay_ms(2000);
    //LCD_Clear();
  }

  return 0;
  }
*/


void setup() {
  LCD_Init();
}

void loop() {
  char buffer[80];
  uint8_t humidity_high, humidity_low, temp_high, temp_low, checksum;

  dht22_request();

  if (dht22_response()) {
    humidity_high = dht22_receive_data();
    humidity_low = dht22_receive_data();
    temp_high = dht22_receive_data();
    temp_low = dht22_receive_data();
    checksum = dht22_receive_data();

    // Debug için okunan değerleri UART üzerinden yazdıralım
    snprintf(buffer, sizeof(buffer), "Humidity High: %d, Low: %d\r\n", humidity_high, humidity_low);
    LCD_String(buffer);
    snprintf(buffer, sizeof(buffer), "Temp High: %d, Low: %d\r\n", temp_high, temp_low);
    LCD_String(buffer);
    snprintf(buffer, sizeof(buffer), "Checksum: %d\r\n", checksum);
    LCD_String(buffer);

    int humidity = (humidity_high << 8) | humidity_low;
    int temperature = (temp_high << 8) | temp_low;

    // Checksum kontrolü
    if ((humidity_high + humidity_low + temp_high + temp_low) == checksum) {
      snprintf(buffer, sizeof(buffer), "Humidity: %d.%d%%, Temperature: %d.%dC\r\n", humidity / 10, humidity % 10, temperature / 10, temperature % 10);
      LCD_String(buffer);
    } else {
      LCD_String("Checksum error\r\n");
    }
  } else {
    LCD_String("DHT22 not responding\r\n");
  }

  _delay_ms(2000);
}