/*
  // write!
  Serial.println("writing to RTC...");
  present = ds.reset();
  ds.select(addr);
  ds.write(0x99,1);   // write RTC - this is the write code
  ds.write(0xAC);  //This is the control byte.  AC in hex = 10101100
                   //read the datasheet and you will see that this is important
                   //to start the internal osc's... Or to make the clock start
                   //counting seconds.  --ril3y
  ds.write(0x02);  //0x02 is a random time set it with your own
  ds.write(0x03);  //same with this
  ds.write(0x05);  //this
  ds.write(0x08);  //and this
  present = ds.reset();
  delay(1500);     // unknown if wait needed
*/

#include <OneWire.h>

// DS1904 Real Time Clock iButton I/O
OneWire ds(10);  // on pin 10

void setup(void) {
  Serial.begin(9600);
}

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

  if ( !ds.search(addr)) {
      Serial.print("No more addresses found.\n");
      ds.reset_search();
      delay(500);  // for readability
      return;
  }

  Serial.print("ROM: ");
  for( i = 0; i < 8; i++) {
    Serial.print(addr[i], HEX);
    Serial.print(" ");
  }

  if ( OneWire::crc8( addr, 7) != addr[7]) {
      Serial.print("CRC is not valid!\n");
      return;
  }

  if ( addr[0] != 0x24) {
      Serial.print("\t\tDevice is not a DS1904 family device.\n");
      return;
  }

/*
  // write!
  Serial.println("writing to RTC...");
  present = ds.reset();
  ds.select(addr);
  ds.write(0x99,1);   // write RTC - this is the write code
  ds.write(0xAC);  //This is the control byte.  AC in hex = 10101100
                   //read the datasheet and you will see that this is important
                   //to start the internal osc's... Or to make the clock start
                   //counting seconds.  --ril3y
  ds.write(0x02);  //0x02 is a random time set it with your own
  ds.write(0x03);  //same with this
  ds.write(0x05);  //this
  ds.write(0x08);  //and this
  present = ds.reset();
  delay(1500);     // unknown if wait needed
*/

  // read!
  present = ds.reset();
  ds.select(addr);
  ds.write(0x66,1);   // read RTC

  Serial.print("PR: ");
  Serial.print(present, HEX);
  for ( i = 0; i < 5; i++) {
    data[i] = ds.read();
  }
  Serial.print(" CTRL BYTE:  ");
  Serial.print(data[0], BIN);
  Serial.print("\n\ttime:  ");
  for ( i = 1; i < 5; i++) {
    Serial.print(data[i], HEX);
    Serial.print(" ");
  }


  Serial.println();
  
}