#include <OneWire.h>
#include "nano.h"
#include "LCD.h"
// include the library code:

OneWire  ds(7);  // on pin 7 (a 4.7K resistor is necessary)
float celsius;
void setup(void) {
  // Serial.begin(9600);
  nano_init();
  init_LCD(); // initialize LCD
  LCD_cmd(0x0C); // display on, cursor off
  delay(100);
  DS18B20_write_key();
  lcd_clear();
  lcd_set_cursor(0, 0);
  LCD_writeString("Code: ");
  lcd_set_cursor(1, 0);
  LCD_writeString("TEMP: ");
}

void loop(void) {
  byte i;
  byte present = 0;
  byte type_s;
  byte data[9];
  byte addr[8];

  ds.reset();
  ds.write(0xCC, 1);
  ds.write(0x44, 1);        // start conversion, with parasite power on at the end

  delay(750);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.

  present = ds.reset();
  //  ds.select(addr);
  ds.write(0xCC);
  ds.write(0xBE);         // Read Scratchpad
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
  }
  lcd_set_cursor(0, 6);
  lcd_print_hex(data[2]);
  lcd_set_cursor(0, 9);
  lcd_print_hex(data[3]);


  // Convert the data to actual temperature
  // because the result is a 16 bit signed integer, it should
  // be stored to an "int16_t" type, which is always 16 bits
  // even when compiled on a 32 bit processor.
  int16_t raw = (data[1] << 8) | data[0];
  raw = raw << 3; // 9 bit resolution default
  raw = (raw & 0xFFF0) + 12 - data[6];
  celsius = (float)raw / 16.0;
  lcd_set_cursor(1, 6);
  lcd_print_float(celsius);
  // Serial.print("  Temperature = ");
  // Serial.print(celsius);
  // Serial.println(" C");
}

void DS18B20_write_key(void)
{
  ds.reset();
  ds.write(0xCC, 1);
  ds.write(0x4E, 1); //write_scratchpad
  ds.write(0x24, 1); // Byte1 User data //
  ds.write(0x10, 1); // Byte2 User data //
  ds.write(0x7F, 1); // config reg
  ds.reset();
  ds.write(0xCC);
  ds.write(0x48); //copy_scratchpad
  delayMicroseconds(2);
  ds.reset();
}