MCP79410 RTC Arduino Code

gistfile1.txt

# From: http://web.icedsl.hu/enicke/mcprtc/mcpcode.html

#include <Wire.h>

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

void loop(){

  WriteRTCByte(0,0);       //STOP RTC
  WriteRTCByte(1,0x18);    //MINUTE=18
  WriteRTCByte(2,0x08);    //HOUR=8
  WriteRTCByte(3,0x09);    //DAY=1(MONDAY) AND VBAT=1
  WriteRTCByte(4,0x28);    //DATE=28
  WriteRTCByte(5,0x02);    //MONTH=2
  WriteRTCByte(6,0x11);    //YEAR=11
  WriteRTCByte(0,0x80);    //START RTC, SECOND=00
  delay(100);
  
  while(1){
    Serial.print("20");    //year beginning with 20xx
    DisplayRTCData(6,8);
    Serial.print(".");
    DisplayRTCData(5,5);
    Serial.print(".");
    DisplayRTCData(4,6);    
    Serial.print(" ");
    DisplayRTCData(2,6);
    Serial.print(":");
    DisplayRTCData(1,7);
    Serial.print(":");
    DisplayRTCData(0,7);
    Serial.println();
    
    delay(1000);
  }  
}

unsigned char ReadRTCByte(const unsigned char adr){
  unsigned char data;
 
  Wire.beginTransmission(0x6f);
  Wire.send(adr);
  Wire.endTransmission();
  
  Wire.requestFrom(0x6f,1);
  while (Wire.available()) data=Wire.receive();

  return data;
}

void WriteRTCByte(const unsigned char adr, const unsigned char data){
  Wire.beginTransmission(0x6f);
  Wire.send(adr);
  Wire.send(data);
  Wire.endTransmission();
} 

void DisplayRTCData(const unsigned char adr, const unsigned char validbits){
  unsigned char data;
  
  data=ReadRTCByte(adr);
  data=data & 0xff>>(8-validbits);
  if (data<10) Serial.print("0");  //leading zero
  Serial.print(data,HEX);
}

perfect, can you add alarms also.

please share wire.h file.i require as soon as possible.

Hi!
Thank's for you share your code!
You saved my day!

Release...

Wire.send is now Wire.write
Wire.receive is now Wire.read

Hey,
Can't we set the second value???
Because, RTC is running only if i set seconds=0x80!!