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Author Topic: DS1307 library updated for IDE 1.0  (Read 1426 times)
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italy
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I want to share with you a DS1307 library updated for IDE 1.0 (the original one is from seeedstudio)

cpp
Code:
#include "Arduino.h"

extern "C" {
#include <Wire.h>
#include <avr/pgmspace.h>
}

#include "DS1307.h"



DS1307::DS1307()
{
  Wire.begin();
}

DS1307 RTC=DS1307();

// PRIVATE FUNCTIONS

// Aquire data from the RTC chip in BCD format
// refresh the buffer
void DS1307::read(void)
{
  // use the Wire lib to connect to tho rtc
  // reset the resgiter pointer to zero
  Wire.beginTransmission(DS1307_CTRL_ID);
  Wire.write((uint8_t)0x00);
  Wire.endTransmission();

  // request the 7 bytes of data    (secs, min, hr, dow, date. mth, yr)
  Wire.requestFrom(DS1307_CTRL_ID, 7);
  for(int i=0; i<7; i++)
  {
    // store data in raw bcd format
    rtc_bcd[i]=Wire.read();
  }
}

// update the data on the IC from the bcd formatted data in the buffer
void DS1307::save(void)
{
  Wire.beginTransmission(DS1307_CTRL_ID);
  Wire.write((byte)0x00); // reset register pointer
  for(int i=0; i<7; i++)
  {
    Wire.write(rtc_bcd[i]);
  }
  Wire.endTransmission();
}


// PUBLIC FUNCTIONS
void DS1307::get(int *rtc, boolean refresh)   // Aquire data from buffer and convert to int, refresh buffer if required
{
  if(refresh) read();
  for(int i=0;i<7;i++)  // cycle through each component, create array of data
  {
    rtc[i]=get(i, 0);
  }
}

int DS1307::get(int c, boolean refresh)  // aquire individual RTC item from buffer, return as int, refresh buffer if required
{
  if(refresh) read();
  int v=-1;
  switch(c)
  {
  case DS1307_SEC:
    v=(10*((rtc_bcd[DS1307_SEC] & DS1307_HI_SEC)>>4))+(rtc_bcd[DS1307_SEC] & DS1307_LO_BCD);
    break;
  case DS1307_MIN:
    v=(10*((rtc_bcd[DS1307_MIN] & DS1307_HI_MIN)>>4))+(rtc_bcd[DS1307_MIN] & DS1307_LO_BCD);
    break;
  case DS1307_HR:
    v=(10*((rtc_bcd[DS1307_HR] & DS1307_HI_HR)>>4))+(rtc_bcd[DS1307_HR] & DS1307_LO_BCD);
    break;
  case DS1307_DOW:
    v=rtc_bcd[DS1307_DOW] & DS1307_LO_DOW;
    break;
  case DS1307_DATE:

    
       v=rtc_bcd[DS1307_DATE]/16 * 10 +  rtc_bcd[DS1307_DATE] % 16;
    
    break;
  case DS1307_MTH:
    v=(10*((rtc_bcd[DS1307_MTH] & DS1307_HI_MTH)>>4))+(rtc_bcd[DS1307_MTH] & DS1307_LO_BCD);
    break;
  case DS1307_YR:

    
      v=2000 + rtc_bcd[DS1307_YR]/16 * 10 + rtc_bcd[DS1307_YR] % 16;
    
    break;

  } // end switch
  return v;
}

void DS1307::set(int c, int v)  // Update buffer, then update the chip
{
  switch(c)
  {
  case DS1307_SEC:
    if(v<60 && v>-1)
    {
      //preserve existing clock state (running/stopped)
      int state=rtc_bcd[DS1307_SEC] & DS1307_CLOCKHALT;
      rtc_bcd[DS1307_SEC]=state | ((v / 10)<<4) + (v % 10);
    }
    break;
  case DS1307_MIN:
    if(v<60 && v>-1)
    {
      rtc_bcd[DS1307_MIN]=((v / 10)<<4) + (v % 10);
    }
    break;
  case DS1307_HR:
    // TODO : AM/PM  12HR/24HR
    if(v<24 && v>-1)
    {
      rtc_bcd[DS1307_HR]=((v / 10)<<4) + (v % 10);
    }
    break;
  case DS1307_DOW:
    if(v<8 && v>-1)
    {
      rtc_bcd[DS1307_DOW]=v;
    }
    break;
  case DS1307_DATE:
    if(v<32 && v>-1)
    {
      rtc_bcd[DS1307_DATE]=((v / 10)<<4) + (v % 10);
    }
    break;
  case DS1307_MTH:
    if(v<13 && v>-1)
    {
      rtc_bcd[DS1307_MTH]=((v / 10)<<4) + (v % 10);
    }
    break;
  case DS1307_YR:
    if(v<50 && v>-1)
    {
      rtc_bcd[DS1307_YR]=((v / 10)<<4) + (v % 10);
    }
    break;
  } // end switch
  save();
}

void DS1307::stop(void)
{
  // set the ClockHalt bit high to stop the rtc
  // this bit is part of the seconds byte
  rtc_bcd[DS1307_SEC]=rtc_bcd[DS1307_SEC] | DS1307_CLOCKHALT;
  save();
}

void DS1307::start(void)
{
  // unset the ClockHalt bit to start the rtc
  // TODO : preserve existing seconds
  rtc_bcd[DS1307_SEC]=0;
  save();
}




h
Code:
/*
  DS1307.h - library for DS1307 rtc
*/

// ensure this library description is only included once
#ifndef DS1307_h
#define DS1307_h

// include types & constants of Wiring core API

#include "Arduino.h"

// include types & constants of Wire ic2 lib
#include <../Wire/Wire.h>

#define DS1307_SEC 0
#define DS1307_MIN 1
#define DS1307_HR 2
#define DS1307_DOW 3
#define DS1307_DATE 4
#define DS1307_MTH 5
#define DS1307_YR 6

#define DS1307_BASE_YR 2000

#define DS1307_CTRL_ID B1101000  //DS1307

 // Define register bit masks
#define DS1307_CLOCKHALT B10000000

#define DS1307_LO_BCD  B00001111
#define DS1307_HI_BCD  B11110000

#define DS1307_HI_SEC  B01110000
#define DS1307_HI_MIN  B01110000
#define DS1307_HI_HR   B00110000
#define DS1307_LO_DOW  B00000111
#define DS1307_HI_DATE B00110000
#define DS1307_HI_MTH  B00110000
#define DS1307_HI_YR   B11110000

// library interface description
class DS1307
{
  // user-accessible "public" interface
  public:
    DS1307();
    void get(int *, boolean);
    int get(int, boolean);
void set(int, int);
    void start(void);
    void stop(void);

  // library-accessible "private" interface
  private:
    byte rtc_bcd[7]; // used prior to read/set ds1307 registers;
void read(void);
void save(void);
};

extern DS1307 RTC;

#endif
 


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Ciao Cantore,

the original library is here: http://code.google.com/p/ds1307/

may you officially correct it ? i open an issue on 1.0 compatibility but i think that the autor abandoned it.

Is there an help request also on italian forum, if you want respond here: http://arduino.cc/forum/index.php/topic,83670.msg629112.html#msg629112

grazie
ciao
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